As a prescription, green tea is used for genital warts. As a drink or supplement, it is sometimes used for high levels of cholesterol or other fats (lipids) in the blood (hyperlipidemia) and high blood pressure, to prevent heart disease, and to prevent cancer of the lining of the uterus (endometrial cancer) and ovarian cancer. It is also used for many other conditions, but there is no good scientific evidence to support these other uses.
How does it work ?
Polyphenols might be able to prevent inflammation and swelling, protect cartilage between the bones, and lessen joint degeneration. They also seem to be able to fight human papilloma virus (HPV) infections and reduce the growth of abnormal cells in the cervix (cervical dysplasia). Research cannot yet explain how this works.
Green tea contains 2% to 4% caffeine, which affects thinking and alertness, increases urine output, and may improve the function of brain messengers important in Parkinson's disease. Caffeine is thought to stimulate the nervous system, heart, and muscles by increasing the release of certain chemicals in the brain called "neurotransmitters."
Antioxidants and other substances in green tea might help protect the heart and blood vessels.
Uses & Effectiveness ?
Likely Effective for
Possibly Effective for
- Heart disease. Population studies suggest that drinking green tea is linked to a reduced risk of clogged arteries. The link seems to be stronger in men than women. Also, people who drink at least three cups of green tea daily might have a lower risk of death from heart disease.
- Cancer of the lining of the uterus (endometrial cancer). Population studies suggest that drinking green tea is linked to a reduced risk of developing endometrial cancer.
- High levels of cholesterol or other fats (lipids) in the blood (hyperlipidemia). People who consume higher amounts of green tea seem to have lower levels of total cholesterol, low-density lipoprotein (LDL or "bad") cholesterol, and blood fats called triglycerides. They also seem to have higher levels of high-density lipoprotein (HDL or "good") cholesterol. Consuming green tea or taking green tea extract daily for up to 24 weeks may reduce total cholesterol and LDL cholesterol. Early research also suggests that green tea extract might reduce damage to vein and artery walls in people with high cholesterol.
- High blood pressure. Drinking green tea might reduce the risk of developing high blood pressure. It might also slightly lower blood pressure in people with high blood pressure. But not all research agrees.
- Ovarian cancer. Women who regularly drink tea, including green or black tea, appear to have a lower risk of developing ovarian cancer. But green tea does not seem to prevent people who have already had ovarian cancer from getting ovarian cancer again.
Insufficient Evidence for
- Acne. Most early research suggests that applying green tea extract to the skin reduces acne.
- Decline in memory and thinking skills that occurs normally with age. Most early research suggests that taking green tea does not improve memory or thinking skills in older adults.
- Abnormal protein buildup in the body (amyloidosis). Early research shows that drinking green tea or taking green tea extracts for 12 months protects against an increase in heart mass in people with amyloidosis affecting the heart.
- Athletic performance. There is conflicting evidence about the effects of green tea on athletic performance. Some early research suggests that taking green tea extract as a beverage doesn't improve breathing or performance in people undergoing endurance training. But other early research shows that taking specific pills containing a component of green tea three times daily with meals for a total dose of seven pills, improves some breathing tests during exercise in healthy adults.
- A blood disorder that reduces levels of protein in the blood called hemoglobin (beta-thalassemia). Patients with beta-thalassemia might develop high iron levels. Early research suggests that taking an iron chelator medication and drinking green tea after meals helps the body to remove more iron than using the iron chelator alone.
- Bladder cancer. Some population evidence suggests that drinking green tea is linked to a lower risk of bladder cancer. But some conflicting research exists.
- Breast cancer. Population research suggests that drinking green tea is not linked to a reduced risk of breast cancer. But there is some evidence that it might be linked with a reduced risk of breast cancer development in Asian-Americans but not Asian people. Green tea might have different protective effects in people depending on their genotype or whether they have gone through menopause. In people with early-stage but not late-stage breast cancer, drinking green tea seems to be linked with a reduced risk of breast cancer recurring.
- Cancer of the cervix. Research suggests that taking a specific green tea extract daily for 4 months does not affect cervical cancer risk in women with HPV infection.
- Abnormal cells on the surface of the cervix (cervical dysplasia). Early research shows that taking a green tea product by mouth or applying it to the skin might reduce cervical lesions caused by human papilloma virus (HPV) infection.
- Memory and thinking skills (cognitive function). Early research shows that taking a chemical found in green tea does not seem to improve cognitive function in healthy adults.
- Decline in memory and thinking skills in older people that is more than what is normal for their age. Drinking green tea at least once per week might reduce the risk of a decline in memory and thinking skills in older people. Also, early research shows that taking green tea extract might help to improve memory by a small amount in older people with a decline in memory and thinking skills.
- Non-cancerous growths in the large intestine and rectum (colorectal adenoma). Early research shows that taking green tea extract might reduce the risk for new growths in people who have already had these growths removed.
- Colon cancer, rectal cancer. Some evidence suggests that drinking green tea is linked with a reduced risk of colon or rectal cancer, particularly in women. But not all research agrees.
- Common cold. Early research shows that taking a specific product containing green tea and other ingredients reduces cold symptoms and duration.
- Diseases, such as Alzheimer disease, that interfere with thinking (dementia). Drinking green tea at least once per week might reduce the risk of a decline in memory and thinking skills in older people. This might reduce the risk of dementia.
- Depression. Population research suggests that Japanese adults who drink four or more cups of green tea daily have a lower risk for depression than those who drink one cup or less.
- Diabetes. Overall, some evidence suggests that drinking green tea might help prevent diabetes from developing. But in people with diabetes, most research suggests that drinking green tea or taking green tea extract does not help control blood sugar. Taking green tea extract might help to improve body weight and levels of blood fats in people with type 2 diabetes.
- Dry eye. Early research shows that applying green tea extract into the eyes along with using eye drops helps to reduce eye itching, burning, and redness.
- Menstrual cramps (dysmenorrhea). Some research shows that drinking green tea might reduce the risk for having menstrual cramps.
- Cancer of the esophagus. Some population research suggests that drinking green tea is linked to a reduced risk of esophageal cancer. But there is some conflicting research. Some research suggests that drinking green tea is linked to a reduced risk of esophageal cancer in only women, but not men. Also, some population research suggests that drinking green tea that is very hot is linked to an increased risk of esophageal cancer. Drinking decaffeinated green tea does not seem to benefit people already diagnosed with esophageal cancer.
- Fractures. Early research found that drinking green tea is linked to a reduced risk of fracture when compared with not drinking green tea.
- Stomach cancer. Some population research suggests that drinking at least 5 cups of green tea daily is not linked with a reduced risk of stomach cancer. But other population research suggests that drinking at least 10 cups of green tea daily is linked with a reduced risk of stomach cancer.
- Low blood pressure. Early research shows that drinking green tea might help increase blood pressure in elderly people who have low blood pressure after eating. This increase in blood pressure is probably due to the caffeine in green tea.
- Flu (influenza). Early research suggests that taking green tea extract and theanine lowers the risk of getting the flu. Other early research suggests that taking a specific product containing green tea and other ingredients reduces flu symptoms and duration. Gargling with green tea at least three times daily for 90 days doesn't seem to prevent the flu in high school students.
- Allergy to Japanese cedar pollen. Early research suggests that drinking a type of green tea called "Benifuuki" daily for 6-10 weeks before being exposed to Japanese cedar pollen can reduce allergy symptoms.
- Kidney stones. Early research suggests that people who drink green tea might be less likely to have kidney stones.
- Cancer of the white blood cells (leukemia). Some population research suggests that people who drink higher amounts of green tea have a lower risk of developing leukemia. But not all research agrees.
- Liver cancer. Some early research suggests that drinking green tea is not linked to a reduced risk of liver cancer. But other early research has found that drinking green tea is linked to a lower risk of liver cancer in women but not men.
- Lung cancer. Some research has found that drinking at least 5 cups of green tea daily is not linked with a reduced risk of death related to lung cancer. But men who consume high amounts of phytoestrogens, chemicals found in green tea, have a lower risk of developing lung cancer. Also, some population research suggests that increasing green tea intake by two cups daily or drinking 7-10 cups of green tea daily is linked with a reduced risk of lung cancer.
- Mental alertness. Green tea contains caffeine. Drinking beverages that contain caffeine seems to help people maintain mental alertness throughout the day. Combining caffeine with sugar as an "energy drink" seems to improve mental performance more than caffeine or sugar alone. But taking a single dose of a certain chemical in green tea called epigallocathechin-3-gallate (EGCG) doesn't seem to improve move or mental performance in healthy adults.
- A grouping of symptoms that increase the risk of diabetes, heart disease, and stroke (metabolic syndrome). Early research suggests that taking 1000 mg of green tea extract daily or drinking four cups of green tea daily for 8 weeks does not improve blood pressure, cholesterol levels, or blood sugar in obese people with metabolic syndrome.
- Cancer of white blood cells called plasma cells (multiple myeloma). Drinking green tea does not seem to reduce the risk for multiple myeloma.
- Heart attack. Drinking at least one cup of green tea per day has been linked with a lower risk of heart attack compared to drinking less than one cup per day.
- Cancer of the upper part of the throat behind the nose (nasopharyngeal cancer). Some research shows that drinking more green tea is linked with a reduced risk of having nasopharyngeal cancer.
- Build up of fat in the liver in people who drink little or no alcohol (nonalcoholic fatty liver disease or NAFLD). Some research shows that drinking green tea daily for 12 weeks doesn't reduce body weight or body mass in people with NAFLD. But it might improve fatty liver disease severity. Also taking green tea extract might improve markers of liver injury, body mass, and cholesterol in people with NAFLD.
- Cancer that starts in white blood cells (non-Hodgkin lymphoma). Some research suggests that drinking at least 3.5 cups of green tea daily is not linked to a reduced risk of developing non-Hodgkin lymphoma.
- Obesity. The best evidence to date suggests that taking green tea that contains caffeine might slightly reduce body weight in people with obesity. It seems to work better than caffeine alone. But the amount of weight loss is small and probably not meaningful. Also, taking decaffeinated green tea might not help.
- Mouth cancer. Population research suggests that drinking green tea is linked with a reduced risk of developing mouth cancer. Also, early research suggests that taking green tea extract three times daily after meals for 12 weeks increases healing responses in people with mouth cancer.
- Weak and brittle bones (osteoporosis). Early research found that drinking green tea for 10 years is linked to increased bone mineral density. Early research also shows that taking green tea extract daily for 24 weeks improves biomarkers of bone density in postmenopausal women with low bone density. But taking green tea extract does not seem to improve bone density in postmenopausal women when measured using bone density scanning.
- Death from any cause. Some research suggests that drinking more green tea daily is linked to a reduced risk of death from any cause.
- Pancreatic cancer. Although some research disagrees, most research suggests that drinking green tea is not linked to a reduced risk of pancreatic cancer.
- Parkinson disease. Some research shows that drinking caffeinated beverages can reduce the risk of Parkinson disease. Drinking one to four cups daily seems to provide the most protection against developing Parkinson disease.
- A serious gum infection (periodontitis). Chewing candy that contains green tea extract seems to control plaque build-up on the teeth and reduce gum swelling. Also population research suggests that drinking green tea is linked with a reduced risk of gum disease. Also, applying a gel containing green tea extract improves symptoms in people with long-term gum disease.
- Pneumonia. Population research suggests that Japanese women who drink green tea have a lower risk of death from pneumonia compared to those who don't drink green tea.
- Pain after surgery. Research suggests that using a mouthwash containing green tea extract twice daily beginning the day after tooth removal surgery reduces pain and the need to use painkillers.
- Prostate cancer. Some research shows that taking products containing green tea antioxidants reduces the risk of prostate cancer in high-risk patients. Also, drinking more green tea is associated with a reduced risk of having prostate cancer. But taking green tea or green tea extracts does not seem to slow the progression of prostate cancer that has already been diagnosed.
- Diarrhea caused by radiation therapy. Early research shows that taking a green tea tablet during pelvic radiation treatment might reduce how often someone has diarrhea.
- Nausea and vomiting caused by radiation therapy. Early research shows that taking a green tea tablet during pelvic radiation treatment might not reduce how often someone vomits.
- Stress. Early research suggests that taking green tea extract by mouth for 7 days reduces stress and increases calmness in healthy people.
- Stroke. Population research suggests that drinking more green tea daily is linked to a reduced risk of having a stroke.
- An autoimmune disease that causes widespread swelling (systemic lupus erythematosus or SLE). Early research shows that green tea extract seems to improve symptoms and general health in people with lupus.
- Athlete's foot (Tinea pedis). Research suggests that using a footbath containing green tea extract for 15 minutes once daily for 12 weeks doesn't improve symptoms of athlete's foot, but does improve skin condition.
- A type of inflammatory bowel disease (ulcerative colitis). Early research suggests that taking a specific green tea product twice daily for 8 weeks might improve inflammatory bowel disease and help people with this condition achieve remission.
- Upper airway infection. Early research suggests that gargling and swallowing green tea over 4 days is less effective than labdanum lozenges for reducing symptoms of upper respiratory tract infections.
- Infections of the kidney, bladder, or urethra (urinary tract infections or UTIs). A small study shows that adding green tea capsules to antibiotic treatment seems to reduce symptoms of UTI more than taking the antibiotic alone.
- Skin wrinkles from sun damage. Some early research suggests that taking green tea antioxidants twice daily for 2 years does not reduce the signs of sun damage to the face in women. Also, applying a green tea cream and taking green tea by mouth daily seems to improve some aspects of skin aging in women, but overall appearance of skin does not seem to improve. However, some early research shows that drinking a beverage containing green tea antioxidants improves skin roughness, hydration, and elasticity in middle-aged women.
- Chronic fatigue syndrome.
- A type of inflammatory bowel disease (Crohn disease).
- Inability to become pregnant within a year of trying to conceive (infertility).
- Skin cancer.
- White patches inside the mouth that are usually caused by smoking (oral leukoplakia).
- Other conditions.
Green tea extract is POSSIBLY SAFE for most people when taken by mouth for up to 2 years or when used as a mouthwash, short-term. In some people, green tea extract can cause stomach upset and constipation. Green tea extracts have been reported to cause liver and kidney problems in rare cases.
Drinking green tea is POSSIBLY UNSAFE when consumed for a long time or in high doses (more than 8 cups per day). Drinking large amounts of green tea might cause side effects due to the caffeine content. These side effects can range from mild to serious and include headache, nervousness, sleep problems, vomiting, diarrhea, irritability, irregular heartbeat, tremor, heartburn, dizziness, ringing in the ears, convulsions, and confusion. Green tea also contains a chemical that has been linked with liver injury when used in high doses. In order to reduce the risk for liver injury, take green tea extract with food.
When applied to the skin: Green tea extract is LIKELY SAFE when a specific, FDA-approved ointment (Veregen, Bradley Pharmaceuticals) is applied to the skin, short-term. Green tea is POSSIBLY SAFE when other green tea products are applied to the skin, short-term.
Special Precautions and Warnings
Pregnancy and breast-feeding: If you are pregnant or breast-feeding, drinking green tea is POSSIBLY SAFE in amounts of 6 cups per day or less. This amount of green tea provides about 300 mg of caffeine. Drinking more than this amount during pregnancy is POSSIBLY UNSAFE and has been linked to an increased risk of miscarriage and other negative effects. Also, green tea might increase the risk of birth defects associated with folic acid deficiency.
In women who are nursing, caffeine passes into breast milk and can affect a nursing infant. Nursing mothers should closely monitor caffeine intake to make sure it is on the low side (2-3 cups per day). High intake of caffeine by nursing mothers can cause sleep problems, irritability, and increased bowel activity in breast-fed infants.
"Tired blood" (anemia): Drinking green tea may make anemia worse.
Anxiety disorders: The caffeine in green tea might make anxiety worse.
Bleeding disorders: Caffeine in green tea might increase the risk of bleeding. Don't drink green tea if you have a bleeding disorder.
Heart conditions: Caffeine in green tea might cause irregular heartbeat.
Diabetes: Caffeine in green tea might affect blood sugar control. If you drink green tea and have diabetes, monitor your blood sugar carefully.
Diarrhea: Green tea contains caffeine. The caffeine in green tea, especially when taken in large amounts, can worsen diarrhea.
Seizures: Green tea contains caffeine. There is a concern that high doses of caffeine might cause seizures or decrease the effects of drugs used to prevent seizures. If you have ever had a seizure, don't use high doses of caffeine or caffeine-containing supplements such as green tea.
Glaucoma: Drinking green tea increases pressure inside the eye. The increase occurs within 30 minutes and lasts for at least 90 minutes.
High blood pressure: The caffeine in green tea might increase blood pressure in people with high blood pressure. However, this effect might be less in people who consume caffeine from green tea or other sources regularly.
Irritable bowel syndrome (IBS): Green tea contains caffeine. The caffeine in green tea, especially when taken in large amounts, might worsen the diarrhea some people have with IBS.
Liver disease: Green tea extract supplements have been linked to rare cases of liver damage. Green tea extracts might make liver disease worse. Talk to your doctor before taking a green tea extract. Tell your doctor if you have signs of liver damage such as yellowing skin, dark urine, or abdominal pain. Keep in mind that drinking green tea as a beverage in normal amounts is still probably safe.
Weak bones (osteoporosis): Drinking green tea can increase the amount of calcium that is flushed out in the urine. This might weaken bones. If you have osteoporosis, don't drink more than 6 cups of green tea per day. Taking calcium supplements may help make up for calcium that is lost. If you are generally healthy and getting enough calcium from your food or supplements, taking up to 400 mg of caffeine (about 8 cups of green tea) per day doesn't seem to increase the risk of getting osteoporosis.
Amphetamines interacts with GREEN TEA
Stimulant drugs such as amphetamines speed up the nervous system. By speeding up the nervous system, stimulant medications can make you feel jittery and increase your heart rate. The caffeine in green tea might also speed up the nervous system. Taking green tea along with stimulant drugs might cause serious problems including increased heart rate and high blood pressure. Avoid taking stimulant drugs along with caffeine.
Cocaine interacts with GREEN TEA
Stimulant drugs such as cocaine speed up the nervous system. By speeding up the nervous system, stimulant medications can make you feel jittery and increase your heart rate. The caffeine in green tea might also speed up the nervous system. Taking green tea along with stimulant drugs might cause serious problems including increased heart rate and high blood pressure. Avoid taking stimulant drugs along with caffeine.
Ephedrine interacts with GREEN TEA
Stimulant drugs speed up the nervous system. Caffeine (contained in green tea) and ephedrine are both stimulant drugs. Taking green tea along with ephedrine might cause too much stimulation and sometimes serious side effects and heart problems. Do not take caffeine-containing products and ephedrine at the same time.
Do not take this combination
Adenosine (Adenocard) interacts with GREEN TEA
Green tea contains caffeine. The caffeine in green tea might block the affects of adenosine (Adenocard). Adenosine (Adenocard) is often used by doctors to do a test on the heart. This test is called a cardiac stress test. Stop consuming green tea or other caffeine-containing products at least 24 hours before a cardiac stress test.
Antibiotics (Quinolone antibiotics) interacts with GREEN TEA
The body breaks down caffeine to get rid of it. Some antibiotics might decrease how quickly the body breaks down caffeine. Taking these antibiotics along with green tea can increase the risk of side effects including jitteriness, headache, increased heart rate, and other side effects.
Some antibiotics that decrease how quickly the body breaks down caffeine include ciprofloxacin (Cipro), enoxacin (Penetrex), norfloxacin (Chibroxin, Noroxin), sparfloxacin (Zagam), trovafloxacin (Trovan), and grepafloxacin (Raxar).
Birth control pills (Contraceptive drugs) interacts with GREEN TEA
The body breaks down the caffeine in green tea to get rid of it. Birth control pills can decrease how quickly the body breaks down caffeine. Taking green tea along with birth control pills can cause jitteriness, headache, fast heartbeat, and other side effects.
Some birth control pills include ethinyl estradiol and levonorgestrel (Triphasil), ethinyl estradiol and norethindrone (Ortho-Novum 1/35, Ortho-Novum 7/7/7), and others.
Cimetidine (Tagamet) interacts with GREEN TEA
Green tea contains caffeine. The body breaks down caffeine to get rid of it. Cimetidine (Tagamet) can decrease how quickly your body breaks down caffeine. Taking cimetidine (Tagamet) along with green tea might increase the chance of caffeine side effects including jitteriness, headache, fast heartbeat, and others.
Clozapine (Clozaril) interacts with GREEN TEA
The body breaks down clozapine (Clozaril) to get rid of it. The caffeine in green tea seems to decrease how quickly the body breaks down clozapine (Clozaril). Taking green tea along with clozapine (Clozaril) can increase the effects and side effects of clozapine (Clozaril).
Dipyridamole (Persantine) interacts with GREEN TEA
Green tea contains caffeine. The caffeine in green tea might block the affects of dipyridamole (Persantine). Dipyridamole (Persantine) is often used by doctors to do a test on the heart. This test is called a cardiac stress test. Stop drinking green tea or other caffeine-containing products at least 24 hours before a cardiac stress test.
Disulfiram (Antabuse) interacts with GREEN TEA
The body breaks down caffeine to get rid of it. Disulfiram (Antabuse) can decrease how quickly the body gets rid of caffeine. Taking green tea (which contains caffeine) along with disulfiram (Antabuse) might increase the effects and side effects of caffeine including jitteriness, hyperactivity, irritability, and others.
Estrogens interacts with GREEN TEA
The body breaks down the caffeine in green tea to get rid of it. Estrogens can decrease how quickly the body breaks down caffeine. Taking estrogen pills and drinking green tea can cause jitteriness, headache, fast heartbeat, and other side effects. If you take estrogen pills limit your caffeine intake.
Some estrogen pills include conjugated equine estrogens (Premarin), ethinyl estradiol, estradiol, and others.
Fluvoxamine (Luvox) interacts with GREEN TEA
The body breaks down the caffeine in green tea to get rid of it. Fluvoxamine (Luvox) can decrease how quickly the body breaks down caffeine. Taking green tea along with fluvoxamine (Luvox) might cause too much caffeine in the body, and increase the effects and side effects of caffeine.
Lithium interacts with GREEN TEA
Your body naturally gets rid of lithium. The caffeine in green tea can increase how quickly your body gets rid of lithium. If you take products that contain caffeine and you take lithium, stop taking caffeine products slowly. Stopping caffeine too quickly can increase the side effects of lithium.
Medications for depression (MAOIs) interacts with GREEN TEA
The caffeine in green tea can stimulate the body. Some medications used for depression can also stimulate the body. Drinking green tea and taking some medications for depression might cause too much stimulation of the body and serious side effects including fast heartbeat, high blood pressure, nervousness, and others.
Some of these medications used for depression include phenelzine (Nardil), tranylcypromine (Parnate), and others.
Medications that can harm the liver (Hepatotoxic drugs) interacts with GREEN TEA
Green tea extracts might harm the liver. Taking green tea extracts along with medication that might also harm the liver can increase the risk of liver damage. Do not take green tea extracts if you are taking a medication that can harm the liver.
Some medications that can harm the liver include acetaminophen (Tylenol and others), amiodarone (Cordarone), carbamazepine (Tegretol), isoniazid (INH), methotrexate (Rheumatrex), methyldopa (Aldomet), fluconazole (Diflucan), itraconazole (Sporanox), erythromycin (Erythrocin, Ilosone, others), phenytoin (Dilantin) , lovastatin (Mevacor), pravastatin (Pravachol), simvastatin (Zocor), and many others.
Medications that slow blood clotting (Anticoagulant / Antiplatelet drugs) interacts with GREEN TEA
Green tea might slow blood clotting. Taking green tea along with medications that also slow clotting might increase the chances of bruising and bleeding.
Some medications that slow blood clotting include aspirin, clopidogrel (Plavix), diclofenac (Voltaren, Cataflam, others), ibuprofen (Advil, Motrin, others), naproxen (Anaprox, Naprosyn, others), dalteparin (Fragmin), enoxaparin (Lovenox), heparin, warfarin (Coumadin), and others.
Nicotine interacts with GREEN TEA
Stimulant drugs such as nicotine speed up the nervous system. By speeding up the nervous system, stimulant medications can make you feel jittery and increase your heart rate. The caffeine in green tea might also speed up the nervous system. Taking green tea along with stimulant drugs might cause serious problems including increased heart rate and high blood pressure. Avoid taking stimulant drugs along with caffeine.
Phenylpropanolamine interacts with GREEN TEA
Green tea contains caffeine. Caffeine can stimulate the body. Phenylpropanolamine can also stimulate the body. Taking green tea and phenylpropanolamine together might cause too much stimulation and increase heartbeat, blood pressure and cause nervousness.
Pentobarbital (Nembutal) interacts with GREEN TEA
The stimulant effects of the caffeine in green tea can block the sleep-producing effects of pentobarbital.
Riluzole (Rilutek) interacts with GREEN TEA
The body breaks down riluzole (Rilutek) to get rid of it. Drinking green tea can decrease how quickly the body breaks down riluzole (Rilutek) and increase the effects and side effects of riluzole.
Theophylline interacts with GREEN TEA
Green tea contains caffeine. Caffeine works similarly to theophylline. Caffeine can also decrease how quickly the body gets rid of theophylline. Taking green tea along with theophylline might increase the effects and side effects of theophylline.
Verapamil (Calan, Covera, Isoptin, Verelan) interacts with GREEN TEA
The body breaks down the caffeine in green tea to get rid of it. Verapamil (Calan, Covera, Isoptin, Verelan) can decrease how quickly the body gets rid of caffeine. Drinking green tea and taking verapamil (Calan, Covera, Isoptin, Verelan) can increase the risk of side effects for caffeine including jitteriness, headache, and an increased heartbeat.
Warfarin (Coumadin) interacts with GREEN TEA
Warfarin (Coumadin) is used to slow blood clotting. Large amounts of green tea have been reported to decrease the effectiveness of warfarin (Coumadin). Decreasing the effectiveness of warfarin (Coumadin) might increase the risk of clotting. It is unclear why this interaction might occur. Be sure to have your blood checked regularly. The dose of your warfarin (Coumadin) might need to be changed.
Be cautious with this combination
Alcohol interacts with GREEN TEA
The body breaks down the caffeine in green tea to get rid of it. Alcohol can decrease how quickly the body breaks down caffeine. Taking green tea along with alcohol might cause too much caffeine in the bloodstream and caffeine side effects including jitteriness, headache, and fast heartbeat.
Fluconazole (Diflucan) interacts with GREEN TEA
Green tea contains caffeine. The body breaks down caffeine to get rid of it. Fluconazole (Diflucan) might decrease how quickly the body gets rid of caffeine and cause caffeine to stay in the body too long. Taking fluconazole (Diflucan) along with green tea might increase the risk of side effects such as nervousness, anxiety, and insomnia.
Medications for diabetes (Antidiabetes drugs) interacts with GREEN TEA
Green tea contains caffeine. Caffeine might increase blood sugar. Diabetes medications are used to lower blood sugar. Taking some medications for diabetes along with caffeine might decrease the effectiveness of diabetes medications. Monitor your blood sugar closely. The dose of your diabetes medication might need to be changed.
Some medications used for diabetes include glimepiride (Amaryl), glyburide (DiaBeta, Glynase PresTab, Micronase), insulin, pioglitazone (Actos), rosiglitazone (Avandia), chlorpropamide (Diabinese), glipizide (Glucotrol), tolbutamide (Orinase), and others.
Mexiletine (Mexitil) interacts with GREEN TEA
Green tea contains caffeine. The body breaks down caffeine to get rid of it. Mexiletine (Mexitil) can decrease how quickly the body breaks down caffeine. Taking Mexiletine (Mexitil) along with green tea might increase the caffeine effects and side effects of green tea.
Terbinafine (Lamisil) interacts with GREEN TEA
The body breaks down the caffeine in green tea to get rid of it. Terbinafine (Lamisil) can decrease how fast the body gets rid of caffeine. Taking green tea along with terbinafine (Lamisil) can increase the risk of caffeine side effects including jitteriness, headache, increased heartbeat, and other effects.
Be watchful with this combination
- For high levels of cholesterol or other fats (lipids) in the blood (hyperlipidemia): Green tea or green tea extracts containing 150 to 2500 mg catechins, taken in single or 2 divided doses daily for up to 24 weeks, has been used.
- For high blood pressure: A green tea drink, made by boiling a 3 gram tea bag with 150 mL water, has been used three times daily about 2 hours after each meal for 4 weeks. Also, 379 mg of a specific product containing green tea extract (Olimp Labs, Debica, Poland), taken daily with the morning meal for 3 months, has been used.
- For genital warts: A specific green tea extract ointment (Veregen, Bradley Pharmaceuticals; Polyphenon E ointment 15%, MediGene AG) applied three times daily to warts for up to 16 weeks, has been used. This product is FDA-approved for treating this condition.
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Allen, N. E., Sauvaget, C., Roddam, A. W., Appleby, P., Nagano, J., Suzuki, G., Key, T. J., and Koyama, K. A prospective study of diet and prostate cancer in Japanese men. Cancer Causes Control 2004;15(9):911-920. View abstract.
Antonello, M., Montemurro, D., Bolognesi, M., Di, Pascoli M., Piva, A., Grego, F., Sticchi, D., Giuliani, L., Garbisa, S., and Rossi, G. P. Prevention of hypertension, cardiovascular damage and endothelial dysfunction with green tea extracts. Am.J Hypertens. 2007;20(12):1321-1328. View abstract.
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Awadalla, H. I., Ragab, M. H., Bassuoni, M. W., Fayed, M. T., and Abbas, M. O. A pilot study of the role of green tea use on oral health. Int.J.Dent.Hyg. 2011;9(2):110-116. View abstract.
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Babu, P. V., Sabitha, K. E., Srinivasan, P., and Shyamaladevi, C. S. Green tea attenuates diabetes induced Maillard-type fluorescence and collagen cross-linking in the heart of streptozotocin diabetic rats. Pharmacol.Res. 2007;55(5):433-440. View abstract.
Basu, A., Du, M., Sanchez, K., Leyva, M. J., Betts, N. M., Blevins, S., Wu, M., Aston, C. E., and Lyons, T. J. Green tea minimally affects biomarkers of inflammation in obese subjects with metabolic syndrome. Nutrition 2011;27(2):206-213. View abstract.
Basu, A., Sanchez, K., Leyva, M. J., Wu, M., Betts, N. M., Aston, C. E., and Lyons, T. J. Green tea supplementation affects body weight, lipids, and lipid peroxidation in obese subjects with metabolic syndrome. J Am.Coll.Nutr. 2010;29(1):31-40. View abstract.
Batista, Gde A., Cunha, C. L., Scartezini, M., von der, Heyde R., Bitencourt, M. G., and Melo, S. F. Prospective double-blind crossover study of Camellia sinensis (green tea) in dyslipidemias. Arq Bras.Cardiol. 2009;93(2):128-134. View abstract.
Belza, A., Toubro, S., and Astrup, A. The effect of caffeine, green tea and tyrosine on thermogenesis and energy intake. Eur.J Clin Nutr 2009;63(1):57-64. View abstract.
Bergman, J. and Schjott, J. Hepatitis caused by Lotus-f3? Basic Clin Pharmacol.Toxicol. 2009;104(5):414-416. View abstract.
Bertipaglia de Santana, M., Mandarino, M. G., Cardoso, J. R., Dichi, I., Dichi, J. B., Camargo, A. E., Fabris, B. A., Rodrigues, R. J., Fatel, E. C., Nixdorf, S. L., Simao, A. N., Cecchini, R., and Barbosa, D. S. Association between soy and green tea (Camellia sinensis) diminishes hypercholesterolemia and increases total plasma antioxidant potential in dyslipidemic subjects. Nutrition 2008;24(6):562-568. View abstract.
Boehm, K., Borrelli, F., Ernst, E., Habacher, G., Hung, S. K., Milazzo, S., and Horneber, M. Green tea (Camellia sinensis) for the prevention of cancer. Cochrane.Database.Syst.Rev. 2009;(3):CD005004. View abstract.
Bogdanski, P., Suliburska, J., Szulinska, M., Stepien, M., Pupek-Musialik, D., and Jablecka, A. Green tea extract reduces blood pressure, inflammatory biomarkers, and oxidative stress and improves parameters associated with insulin resistance in obese, hypertensive patients. Nutr.Res. 2012;32(6):421-427. View abstract.
Brown, A. L., Lane, J., Coverly, J., Stocks, J., Jackson, S., Stephen, A., Bluck, L., Coward, A., and Hendrickx, H. Effects of dietary supplementation with the green tea polyphenol epigallocatechin-3-gallate on insulin resistance and associated metabolic risk factors: randomized controlled trial. Br.J Nutr. 2009;101(6):886-894. View abstract.
Brown, A. L., Lane, J., Holyoak, C., Nicol, B., Mayes, A. E., and Dadd, T. Health effects of green tea catechins in overweight and obese men: a randomised controlled cross-over trial. Br.J.Nutr. 2011;106(12):1880-1889. View abstract.
Buscemi, S., Verga, S., Batsis, J. A., Donatelli, M., Tranchina, M. R., Belmonte, S., Mattina, A., Re, A., and Cerasola, G. Acute effects of coffee on endothelial function in healthy subjects. Eur.J Clin Nutr. 2010;64(5):483-489. View abstract.
Chan, C. C., Koo, M. W., Ng, E. H., Tang, O. S., Yeung, W. S., and Ho, P. C. Effects of Chinese green tea on weight, and hormonal and biochemical profiles in obese patients with polycystic ovary syndrome--a randomized placebo-controlled trial. J Soc Gynecol.Investig. 2006;13(1):63-68. View abstract.
Chan, Y. C., Hosoda, K., Tsai, C. J., Yamamoto, S., and Wang, M. F. Favorable effects of tea on reducing the cognitive deficits and brain morphological changes in senescence-accelerated mice. J Nutr.Sci.Vitaminol.(Tokyo) 2006;52(4):266-273. View abstract.
Chen, Y. K., Lee, C. H., Wu, I. C., Liu, J. S., Wu, D. C., Lee, J. M., Goan, Y. G., Chou, S. H., Huang, C. T., Lee, C. Y., Hung, H. C., Yang, J. F., and Wu, M. T. Food intake and the occurrence of squamous cell carcinoma in different sections of the esophagus in Taiwanese men. Nutrition 2009;25(7-8):753-761. View abstract.
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Chiu, A. E., Chan, J. L., Kern, D. G., Kohler, S., Rehmus, W. E., and Kimball, A. B. Double-blinded, placebo-controlled trial of green tea extracts in the clinical and histologic appearance of photoaging skin. Dermatol Surg. 2005;31(7 Pt 2):855-860. View abstract.
Choan, E., Segal, R., Jonker, D., Malone, S., Reaume, N., Eapen, L., and Gallant, V. A prospective clinical trial of green tea for hormone refractory prostate cancer: an evaluation of the complementary/alternative therapy approach. Urol.Oncol. 2005;23(2):108-113. View abstract.
Choi, J. Y., Park, C. S., Kim, D. J., Cho, M. H., Jin, B. K., Pie, J. E., and Chung, W. G. Prevention of nitric oxide-mediated 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine-induced Parkinson's disease in mice by tea phenolic epigallocatechin 3-gallate. Neurotoxicology 2002;23(3):367-374. View abstract.
Choi, K. C., Jung, M. G., Lee, Y. H., Yoon, J. C., Kwon, S. H., Kang, H. B., Kim, M. J., Cha, J. H., Kim, Y. J., Jun, W. J., Lee, J. M., and Yoon, H. G. Epigallocatechin-3-gallate, a histone acetyltransferase inhibitor, inhibits EBV-induced B lymphocyte transformation via suppression of RelA acetylation. Cancer Res. 1-15-2009;69(2):583-592. View abstract.
Chow, H. H., Cai, Y., Alberts, D. S., Hakim, I., Dorr, R., Shahi, F., Crowell, J. A., Yang, C. S., and Hara, Y. Phase I pharmacokinetic study of tea polyphenols following single-dose administration of epigallocatechin gallate and polyphenon E. Cancer Epidemiol.Biomarkers Prev. 2001;10(1):53-58. View abstract.
Chow, H. H., Cai, Y., Hakim, I. A., Crowell, J. A., Shahi, F., Brooks, C. A., Dorr, R. T., Hara, Y., and Alberts, D. S. Pharmacokinetics and safety of green tea polyphenols after multiple-dose administration of epigallocatechin gallate and polyphenon E in healthy individuals. Clin Cancer Res. 8-15-2003;9(9):3312-3319. View abstract.
Chow, H. H., Hakim, I. A., Vining, D. R., Crowell, J. A., Cordova, C. A., Chew, W. M., Xu, M. J., Hsu, C. H., Ranger-Moore, J., and Alberts, D. S. Effects of repeated green tea catechin administration on human cytochrome P450 activity. Cancer Epidemiol.Biomarkers Prev. 2006;15(12):2473-2476. View abstract.
Chow, H. H., Hakim, I. A., Vining, D. R., Crowell, J. A., Ranger-Moore, J., Chew, W. M., Celaya, C. A., Rodney, S. R., Hara, Y., and Alberts, D. S. Effects of dosing condition on the oral bioavailability of green tea catechins after single-dose administration of Polyphenon E in healthy individuals. Clin Cancer Res 6-15-2005;11(12):4627-4633. View abstract.
Chroscinska-Krawczyk, M., Ratnaraj, N., Patsalos, P. N., and Czuczwar, S. J. Effect of caffeine on the anticonvulsant effects of oxcarbazepine, lamotrigine and tiagabine in a mouse model of generalized tonic-clonic seizures. Pharmacol Rep. 2009;61(5):819-826. View abstract.
Chuarienthong, P., Lourith, N., and Leelapornpisid, P. Clinical efficacy comparison of anti-wrinkle cosmetics containing herbal flavonoids. Int J Cosmet.Sci. 2010;32(2):99-106. View abstract.
Ciotta, L., Stracquadanio, M., Formuso, C., Di, Leo S., Ando, A., and Pagano, I. [Clinical effectiveness of N-oleyl-phosphatidyl-ethanolamine (NOPE) in obesity: our experience]. Minerva Gastroenterol.Dietol. 2011;57(3):323-331. View abstract.
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Dell'Aica, I., Dona, M., Tonello, F., Piris, A., Mock, M., Montecucco, C., and Garbisa, S. Potent inhibitors of anthrax lethal factor from green tea. EMBO Rep. 2004;5(4):418-422. View abstract.
Devika, P. T. and Stanely Mainzen, Prince P. (-)Epigallocatechin-gallate (EGCG) prevents mitochondrial damage in isoproterenol-induced cardiac toxicity in albino Wistar rats: a transmission electron microscopic and in vitro study. Pharmacol.Res. 2008;57(5):351-357. View abstract.
Di, Pierro F., Menghi, A. B., Barreca, A., Lucarelli, M., and Calandrelli, A. Greenselect Phytosome as an adjunct to a low-calorie diet for treatment of obesity: a clinical trial. Altern.Med Rev. 2009;14(2):154-160. View abstract.
Diepvens, K., Kovacs, E. M., Vogels, N., and Westerterp-Plantenga, M. S. Metabolic effects of green tea and of phases of weight loss. Physiol Behav 1-30-2006;87(1):185-191. View abstract.
Donovan, J. L., Devane, C. L., Chavin, K. D., Oates, J. C., Njoku, C., Patrick, K. S., Fiorini, R. N., and Markowitz, J. S. Oral administration of a decaffeinated green tea (Camellia sinensis) extract did not alter urinary 8-epi-prostaglandin F(2 alpha), a biomarker for in-vivo lipid peroxidation. J Pharm Pharmacol 2005;57(10):1365-1369. View abstract.
Du, X., Huang, X., Huang, C., Wang, Y., and Zhang, Y. Epigallocatechin-3-gallate (EGCG) enhances the therapeutic activity of a dental adhesive. J.Dent. 2012;40(6):485-492. View abstract.
Dufresne CJ and Farnworth ER. A review of latest research findings on the health promotion properties of tea. Journal of Nutritional Biochemistry 2001;12:404-421.
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Dunne, E. F., Friedman, A., Datta, S. D., Markowitz, L. E., and Workowski, K. A. Updates on human papillomavirus and genital warts and counseling messages from the 2010 Sexually Transmitted Diseases Treatment Guidelines. Clin.Infect.Dis. 2011;53 Suppl 3:S143-S152. View abstract.
Eichenberger, P., Colombani, P. C., and Mettler, S. Effects of 3-week consumption of green tea extracts on whole-body metabolism during cycling exercise in endurance-trained men. Int J Vitam.Nutr.Res. 2009;79(1):24-33. View abstract.
Eichenberger, P., Mettler, S., Arnold, M., and Colombani, P. C. No effects of three-week consumption of a green tea extract on time trial performance in endurance-trained men. Int J Vitam.Nutr.Res. 2010;80(1):54-64. View abstract.
Engdal, S. and Nilsen, O. G. In vitro inhibition of CYP3A4 by herbal remedies frequently used by cancer patients. Phytother.Res. 2009;23(7):906-912. View abstract.
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Ernest, D., Chia, M., and Corallo, C. E. Profound hypokalaemia due to Nurofen Plus and Red Bull misuse. Crit Care Resusc. 2010;12(2):109-110. View abstract.
Favreau, J. T., Ryu, M. L., Braunstein, G., Orshansky, G., Park, S. S., Coody, G. L., Love, L. A., and Fong, T. L. Severe hepatotoxicity associated with the dietary supplement LipoKinetix. Ann.Intern.Med. 4-16-2002;136(8):590-595. View abstract.
Federico, A., Tiso, A., and Loguercio, C. A case of hepatotoxicity caused by green tea. Free Radic.Biol Med 8-1-2007;43(3):474. View abstract.
Frank, J., George, T. W., Lodge, J. K., Rodriguez-Mateos, A. M., Spencer, J. P., Minihane, A. M., and Rimbach, G. Daily consumption of an aqueous green tea extract supplement does not impair liver function or alter cardiovascular disease risk biomarkers in healthy men. J Nutr 2009;139(1):58-62. View abstract.
Freese, R., Basu, S., Hietanen, E., Nair, J., Nakachi, K., Bartsch, H., and Mutanen, M. Green tea extract decreases plasma malondialdehyde concentration but does not affect other indicators of oxidative stress, nitric oxide production, or hemostatic factors during a high-linoleic acid diet in healthy females. Eur.J Nutr. 1999;38(3):149-157. View abstract.
Fukino, Y., Ikeda, A., Maruyama, K., Aoki, N., Okubo, T., and Iso, H. Randomized controlled trial for an effect of green tea-extract powder supplementation on glucose abnormalities. Eur.J Clin Nutr 2008;62(8):953-960. View abstract.
Fukino, Y., Shimbo, M., Aoki, N., Okubo, T., and Iso, H. Randomized controlled trial for an effect of green tea consumption on insulin resistance and inflammation markers. J Nutr Sci Vitaminol.(Tokyo) 2005;51(5):335-342. View abstract.
Fukushima, Y., Ohie, T., Yonekawa, Y., Yonemoto, K., Aizawa, H., Mori, Y., Watanabe, M., Takeuchi, M., Hasegawa, M., Taguchi, C., and Kondo, K. Coffee and green tea as a large source of antioxidant polyphenols in the Japanese population. J Agric.Food Chem. 2-25-2009;57(4):1253-1259. View abstract.
Gao, Y. T., McLaughlin, J. K., Blot, W. J., Ji, B. T., Dai, Q., and Fraumeni, J. F., Jr. Reduced risk of esophageal cancer associated with green tea consumption. J Natl.Cancer Inst. 6-1-1994;86(11):855-858. View abstract.
Gawande, S., Kale, A., and Kotwal, S. Effect of nutrient mixture and black grapes on the pharmacokinetics of orally administered (-)epigallocatechin-3-gallate from green tea extract: a human study. Phytother.Res. 2008;22(6):802-808. View abstract.
Gregersen, N. T., Bitz, C., Krog-Mikkelsen, I., Hels, O., Kovacs, E. M., Rycroft, J. A., Frandsen, E., Mela, D. J., and Astrup, A. Effect of moderate intakes of different tea catechins and caffeine on acute measures of energy metabolism under sedentary conditions. Br.J Nutr. 2009;102(8):1187-1194. View abstract.
Gronroos, N. N. and Alonso, A. Diet and risk of atrial fibrillation - epidemiologic and clinical evidence -. Circ.J 2010;74(10):2029-2038. View abstract.
Gross, G. [Polyphenon E. A new topical therapy for condylomata acuminata]. Hautarzt 2008;59(1):31-35. View abstract.
Gross, G., Meyer, K. G., Pres, H., Thielert, C., Tawfik, H., and Mescheder, A. A randomized, double-blind, four-arm parallel-group, placebo-controlled Phase II/III study to investigate the clinical efficacy of two galenic formulations of Polyphenon E in the treatment of external genital warts. J Eur.Acad.Dermatol.Venereol. 2007;21(10):1404-1412. View abstract.
Hakim, I. A., Chow, H. H., and Harris, R. B. Green tea consumption is associated with decreased DNA damage among GSTM1-positive smokers regardless of their hOGG1 genotype. J Nutr. 2008;138(8):1567S-1571S. View abstract.
Hakim, I. A., Harris, R. B., Brown, S., Chow, H. H., Wiseman, S., Agarwal, S., and Talbot, W. Effect of increased tea consumption on oxidative DNA damage among smokers: a randomized controlled study. J.Nutr. 2003;133(10):3303S-3309S. View abstract.
Hakim, I. A., Harris, R. B., Chow, H. H., Dean, M., Brown, S., and Ali, I. U. Effect of a 4-month tea intervention on oxidative DNA damage among heavy smokers: role of glutathione S-transferase genotypes. Cancer Epidemiol.Biomarkers Prev. 2004;13(2):242-249. View abstract.
Haque, A. M., Hashimoto, M., Katakura, M., Tanabe, Y., Hara, Y., and Shido, O. Long-term administration of green tea catechins improves spatial cognition learning ability in rats. J Nutr. 2006;136(4):1043-1047. View abstract.
Hasani-Ranjbar, S., Nayebi, N., Moradi, L., Mehri, A., Larijani, B., and Abdollahi, M. The efficacy and safety of herbal medicines used in the treatment of hyperlipidemia; a systematic review. Curr.Pharm.Des 2010;16(26):2935-2947. View abstract.
Hatano, B., Kojima, A., Sata, T., and Katano, H. Virus detection using Viro-Adembeads, a rapid capture system for viruses, and plaque assay in intentionally virus-contaminated beverages. Jpn.J Infect.Dis. 2010;63(1):52-54. View abstract.
Hattori, M., Kusumoto, I. T., Namba, T., Ishigami, T., and Hara, Y. Effect of tea polyphenols on glucan synthesis by glucosyltransferase from Streptococcus mutans. Chem.Pharm Bull.(Tokyo) 1990;38(3):717-720. View abstract.
Hauber, I., Hohenberg, H., Holstermann, B., Hunstein, W., and Hauber, J. The main green tea polyphenol epigallocatechin-3-gallate counteracts semen-mediated enhancement of HIV infection. Proc.Natl.Acad.Sci.U.S.A 6-2-2009;106(22):9033-9038. View abstract.
He, Y. H. and Kies, C. Green and black tea consumption by humans: impact on polyphenol concentrations in feces, blood and urine. Plant Foods Hum.Nutr. 1994;46(3):221-229. View abstract.
Heinrich, U., Moore, C. E., De, Spirt S., Tronnier, H., and Stahl, W. Green tea polyphenols provide photoprotection, increase microcirculation, and modulate skin properties of women. J.Nutr. 2011;141(6):1202-1208. View abstract.
Hemelt, M., Hu, Z., Zhong, Z., Xie, L. P., Wong, Y. C., Tam, P. C., Cheng, K. K., Ye, Z., Bi, X., Lu, Q., Mao, Y., Zhong, W. D., and Zeegers, M. P. Fluid intake and the risk of bladder cancer: results from the South and East China case-control study on bladder cancer. Int.J.Cancer 8-1-2010;127(3):638-645. View abstract.
Henning, S. M., Aronson, W., Niu, Y., Conde, F., Lee, N. H., Seeram, N. P., Lee, R. P., Lu, J., Harris, D. M., Moro, A., Hong, J., Pak-Shan, L., Barnard, R. J., Ziaee, H. G., Csathy, G., Go, V. L., Wang, H., and Heber, D. Tea polyphenols and theaflavins are present in prostate tissue of humans and mice after green and black tea consumption. J Nutr 2006;136(7):1839-1843. View abstract.
Henning, S. M., Niu, Y., Lee, N. H., Thames, G. D., Minutti, R. R., Wang, H., Go, V. L., and Heber, D. Bioavailability and antioxidant activity of tea flavanols after consumption of green tea, black tea, or a green tea extract supplement. Am J Clin Nutr 2004;80(6):1558-1564. View abstract.
Henrotin, Y., Lambert, C., Couchourel, D., Ripoll, C., and Chiotelli, E. Nutraceuticals: do they represent a new era in the management of osteoarthritis? - a narrative review from the lessons taken with five products. Osteoarthritis.Cartilage. 2011;19(1):1-21. View abstract.
Hirano, R., Momiyama, Y., Takahashi, R., Taniguchi, H., Kondo, K., Nakamura, H., and Ohsuzu, F. Comparison of green tea intake in Japanese patients with and without angiographic coronary artery disease. Am.J Cardiol. 11-15-2002;90(10):1150-1153. View abstract.
Hirano-Ohmori, R., Takahashi, R., Momiyama, Y., Taniguchi, H., Yonemura, A., Tamai, S., Umegaki, K., Nakamura, H., Kondo, K., and Ohsuzu, F. Green tea consumption and serum malondialdehyde-modified LDL concentrations in healthy subjects. J Am Coll.Nutr 2005;24(5):342-346. View abstract.
Hirao, K., Yumoto, H., Nakanishi, T., Mukai, K., Takahashi, K., Takegawa, D., and Matsuo, T. Tea catechins reduce inflammatory reactions via mitogen-activated protein kinase pathways in toll-like receptor 2 ligand-stimulated dental pulp cells. Life Sci. 4-24-2010;86(17-18):654-660. View abstract.
Hirasawa, M., Takada, K., Makimura, M., and Otake, S. Improvement of periodontal status by green tea catechin using a local delivery system: a clinical pilot study. J Periodontal Res 2002;37(6):433-438. View abstract.
Horiba, N., Maekawa, Y., Ito, M., Matsumoto, T., and Nakamura, H. A pilot study of Japanese green tea as a medicament: antibacterial and bactericidal effects. J Endod. 1991;17(3):122-124. View abstract.
Hsu, C. H., Liao, Y. L., Lin, S. C., Tsai, T. H., Huang, C. J., and Chou, P. Does supplementation with green tea extract improve insulin resistance in obese type 2 diabetics? A randomized, double-blind, and placebo-controlled clinical trial. Altern.Med.Rev. 2011;16(2):157-163. View abstract.
Hsu, C. H., Tsai, T. H., Kao, Y. H., Hwang, K. C., Tseng, T. Y., and Chou, P. Effect of green tea extract on obese women: a randomized, double-blind, placebo-controlled clinical trial. Clin Nutr 2008;27(3):363-370. View abstract.
Hsu, J., Skover, G., and Goldman, M. P. Evaluating the efficacy in improving facial photodamage with a mixture of topical antioxidants. J Drugs Dermatol. 2007;6(11):1141-1148. View abstract.
Hunt, K. J., Hung, S. K., and Ernst, E. Botanical extracts as anti-aging preparations for the skin: a systematic review. Drugs Aging 12-1-2010;27(12):973-985. View abstract.
Hursel, R. and Westerterp-Plantenga, M. S. Green tea catechin plus caffeine supplementation to a high-protein diet has no additional effect on body weight maintenance after weight loss. Am J Clin Nutr 2009;89(3):822-830. View abstract.
Ichinose, T., Nomura, S., Someya, Y., Akimoto, S., Tachiyashiki, K., and Imaizumi, K. Effect of endurance training supplemented with green tea extract on substrate metabolism during exercise in humans. Scand.J Med Sci.Sports 3-10-2010; View abstract.
Imai, K., Suga, K., and Nakachi, K. Cancer-preventive effects of drinking green tea among a Japanese population. Prev.Med 1997;26(6):769-775. View abstract.
Inami, S., Takano, M., Yamamoto, M., Murakami, D., Tajika, K., Yodogawa, K., Yokoyama, S., Ohno, N., Ohba, T., Sano, J., Ibuki, C., Seino, Y., and Mizuno, K. Tea catechin consumption reduces circulating oxidized low-density lipoprotein. Int Heart J 2007;48(6):725-732. View abstract.
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