Coenzyme Q-10

How does Coenzyme Q-10 work?

Coenzyme Q-10 is an important vitamin-like substance required for the proper function of many organs and chemical reactions in the body. It helps provide energy to cells. Coenzyme Q-10 also seems to have antioxidant activity. People with certain diseases, such as congestive heart failure, high blood pressure, periodontal disease, Parkinson's disease, certain muscular diseases, and AIDS, might have lower levels of coenzyme Q-10.

Are there safety concerns?

Coenzyme Q-10 is safe for most adults. While most people tolerate coenzyme Q-10 well, it can cause some mild side effects including stomach upset, loss of appetite, nausea, vomiting, and diarrhea. It can cause allergic skin rashes in some people. It also might lower blood pressure, so check your blood pressure carefully if you have very low blood pressure. Dividing the total daily dose by taking smaller amounts two or three times a day instead of a large amount all at once can help reduce side effects.

Coenzyme Q-10 also seems to be safe for most children. But coenzyme Q-10 should not be used in children without medical supervision.

Do not use coenzyme Q-10 if:
  • You are pregnant or breast-feeding.
  • You are scheduled for surgery in the next two weeks.

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Report Problems to the Food and Drug Administration

You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088.


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