Most of the cells in your body contain carnitine, which your liver and kidneys make. Carnitine helps your cells produce energy. Acetyl-L-carnitine (ALC) is a form of carnitine that's available as a supplement.
Why do people take acetyl-l-carnitine?
People have tried to treat many health problems using ALC, including:
Alcoholism . ALC may help improve mental abilities in people who are alcoholic.
Fragile X syndrome. This is a genetic problem. ALC has been used to affect certain behaviors in boys with fragile X, such as their social skills and hyperactivity, but studies show it is not entirely effective.
Nerve problems. Research has linked ALC with less pain or less intense pain in people with nerve problems from these causes:
Peyronie's disease . This condition causes the penis to curve abnormally. In one study, men who took daily ALC for 3 months had less pain and curving of the penis. The problem also progressed less in the men taking ALC.
Supplement makers suggest varying amounts of this supplement for different purposes. Common dosages range from 1 to 3 grams daily, divided into several doses. But optimal doses have not been established for any condition. Quality and active ingredients in supplements may vary widely from maker to maker. This makes it difficult to establish a standard dose.
Can you get carnitine naturally from foods?
Animal-based foods are good sources of carnitine, including:
- Beef, 4 oz cooked - 56-162 mg
- Chicken, 4 oz cooked - 3-5 mg
- Milk, 1 cup whole - 8 mg
- Cheese, 2 oz cheddar - 2 mg
What are the risks of taking acetyl-L-carnitine?
Side effects. People taking carnitine have reported a number of side effects, including:
- Diarrhea, nausea, stomach pain, and vomiting
- Trouble sleeping
- Higher blood pressure
- Lower blood sugar and higher triglycerides (in people with diabetes)
- Psychosis (in people with bipolar disorder)
Risks. Avoid using carnitine if you're allergic or sensitive to it. Carnitine may not be safe for people with:
- Peripheral vascular disease
- High blood pressure
- Liver cirrhosis
- Kidney failure
- Digestive problems
- Risk factors for mental illness
- Hepatitis C (fatigue may worsen)
- Sleeping problems
- Breathing problems
Interactions. Check with your doctor first if you're taking:
Carnitine may increase the effects of or have other interactions with many drugs. It may also interact with a number of herbs and supplements. Avoid using this supplement with D- or DL-carnitine.
Tell your doctor about any supplements you're taking, even if they're natural. That way, your doctor can check on any potential side effects or interactions with any medications.