Overview
Selenium increases antioxidant effects in the body. Crab, fish, poultry, and wheat are generally good food sources. The amount of selenium in soil varies, and foods grown in different soils have different selenium levels. The Eastern Coastal Plain and Pacific Northwest have the lowest selenium levels in the US.
People commonly use selenium for selenium deficiency and to reduce the risk for high blood pressure during pregnancy. It is also used for prostate cancer, complications from statin drugs, abnormal cholesterol levels, cataracts, and many other conditions, but there is no good scientific evidence to support most of these uses. There is also no good evidence to support using selenium for COVID-19.
Uses & Effectiveness ?
Likely Effective for
- Selenium deficiency. Taking selenium by mouth is effective for preventing selenium deficiency.
Possibly Effective for
- A disease that causes underactive thyroid (autoimmune thyroiditis). Taking selenium by mouth daily along with thyroid hormone might benefit adults, but not children, with this condition.
- A disorder that affects the bones and joints, usually in people with selenium deficiency (Kashin-Beck disease). Adding salt enriched with selenium to food can prevent Kashin-Beck disease in children. But selenium does not seem to improve joint pain or movement in children with Kashin-Beck disease.
- A pregnancy complication marked by high blood pressure and protein in the urine (pre-eclampsia). Taking selenium 60-100 mcg by mouth daily for up to 6 months during pregnancy might reduce the risk of developing pre-eclampsia.
Possibly Ineffective for
- Asthma. Taking selenium by mouth doesn't seem to help asthma symptoms.
- Eczema (atopic dermatitis). Taking yeast that is enriched with selenium by mouth daily for 12 weeks, alone or with vitamin E, does not improve eczema.
- Bladder cancer. Taking selenium by mouth doesn't seem to prevent bladder cancer.
- Heart disease. Taking selenium by mouth doesn't seem to reduce the risk of heart disease.
- Colon cancer, rectal cancer. Taking selenium by mouth doesn't seem to reduce the risk of colon or rectal cancer.
- Diabetes. People who eat diets high in selenium and those who take selenium supplements for many years have an increased risk of type 2 diabetes. For people who already have diabetes, taking selenium by mouth does not improve blood sugar levels.
- Abnormal levels of cholesterol or blood fats (dyslipidemia). Taking selenium by mouth does not improve cholesterol levels in people with dyslipidemia.
- Infants born weighing less than 2500 grams (5 pounds, 8 ounces). Giving selenium by mouth or by IV does not appear to reduce the chance of death in low birth weight infants. IV products can only be given by a healthcare provider.
- Lung cancer. Taking selenium by mouth, alone or with other nutrients, does not reduce the risk of lung cancer. But it might benefit people with low selenium levels.
- Nonmelanoma skin cancer. Taking selenium by mouth doesn't reduce the risk of getting a certain type of skin cancer called basal cell carcinoma. In fact, taking extra selenium might actually increase the risk of getting another type of skin cancer called squamous cell carcinoma.
- Prostate cancer. Taking selenium by mouth does not reduce the risk of getting prostate cancer.
- Scaly, itchy skin (psoriasis). Taking yeast enriched with selenium by mouth daily does not reduce symptoms of psoriasis.
- Blood infection (sepsis). Giving selenium along with other nutrients by IV does not reduce the risk of death in people with sepsis. IV products can only be given by a healthcare provider.
Side Effects
Selenium can cause stomach discomfort, headache, and rash. High doses can cause hair loss, fatigue, nausea, vomiting, and weight loss. Extremely high doses can lead to organ failure and death.
Special Precautions and Warnings
Selenium can cause stomach discomfort, headache, and rash. High doses can cause hair loss, fatigue, nausea, vomiting, and weight loss. Extremely high doses can lead to organ failure and death.
Pregnancy and breast-feeding: Selenium is possibly safe when used short-term in amounts that are not above 400 mcg daily. Selenium is possibly unsafe when taken by mouth in doses above 400 mcg daily. This dose might cause toxicity.
Children: Selenium is possibly safe when taken by mouth appropriately. Selenium seems to be safe when used short-term in doses below 45 mcg daily for infants up to age 6 months, 60 mcg daily for infants 7-12 months, 90 mcg daily for children 1-3 years, 150 mcg daily for children 4-8 years, 280 mcg daily for children 9-13 years, and 400 mcg daily for children age 14 years and older.
Autoimmune diseases: Selenium might stimulate the immune system. People with autoimmune diseases such as multiple sclerosis, systemic lupus erythematosus (SLE), rheumatoid arthritis (RA), and other should avoid taking selenium supplements.
Hemodialysis: Blood levels of selenium can be low in people on hemodialysis. Selenium supplements might be needed for some people.
Under-active thyroid (hypothyroidism): Taking selenium can worsen hypothyroidism, especially in people with iodine deficiency. In this case, you should take iodine along with selenium. Check with your healthcare provider before taking selenium supplements.
Fertility problems in males: Selenium might decrease the ability of sperm to move, which could reduce fertility.
Skin cancer: In people who have had nonmelanoma skin cancer, long-term use of selenium supplements might slightly increase the risk of cancer returning. Avoid long-term use of selenium supplements if you have ever had skin cancer.
Surgery: Selenium might increase the risk of bleeding during and after surgery. Stop taking selenium at least 2 weeks before a scheduled surgery.
Interactions ?
Medications that slow blood clotting (Anticoagulant / Antiplatelet drugs) interacts with SELENIUM
Selenium might slow blood clotting. Taking selenium along with medications that also slow blood clotting might increase the risk of bruising and bleeding.
Niacin interacts with SELENIUM
Taking niacin along with the drug simvastatin can increase good cholesterol levels. Taking niacin plus simvastatin along with selenium and other antioxidants can decrease the effects of niacin and simvastatin on good cholesterol levels. It is unknown if selenium alone decreases the effects of niacin plus simvastatin on good cholesterol levels.
Sedative medications (Barbiturates) interacts with SELENIUM
Selenium might reduce how quickly the body breaks down sedative medications. Taking selenium with these medications might increase the effects and side effects of these medications.
Warfarin (Coumadin) interacts with SELENIUM
Selenium might slow blood clotting. Selenium might also increase the effects of warfarin in the body. Taking selenium along with warfarin might increase the chances of bruising and bleeding.
Medications that decrease the immune system (Immunosuppressants) interacts with SELENIUM
Selenium can increase the activity of the immune system. Some medications, such as those used after a transplant, decrease the activity of the immune system. Taking selenium along with these medications might decrease the effects of these medications.
Moderate Interaction
Be cautious with this combination
Birth control pills (Contraceptive drugs) interacts with SELENIUM
Taking birth control pills might increase blood levels of selenium. But it's not clear if this is a real concern.
Gold salts interacts with SELENIUM
Gold salts bind to selenium and decrease selenium in parts of the body. This might decrease the normal activity of selenium, possibly resulting in symptoms of selenium deficiency.
Minor Interaction
Be watchful with this combination
Dosing
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