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Have any side effects or risks been reported from coenzyme Q10?

1. What is Coenzyme Q10 (Co-Q10, Co Q10)?
2. Preclinical Studies of Coenzyme Q10 (Co-Q10, Co Q10)
3. Heart Disease and Coenzyme Q10 (Co-Q10, Co Q10)
4. Side Effects of Coenzyme Q10 (Co-Q10, Co Q10)

No serious side effects have been reported from the use of coenzyme Q10. Some patients using coenzyme Q10 have experienced mild insomnia (inability to sleep), elevated levels of liver enzymes, rashes, nausea, and upper abdominal pain. Other reported side effects have included dizziness, visual sensitivity to light, irritability, headache, heartburn, and fatigue.

Patients should talk with their health care provider about possible interactions between coenzyme Q10 and prescription drugs they may be taking. Certain drugs, such as those that are used to lower cholesterol or blood sugar levels, may reduce the effects of coenzyme Q10. Coenzyme Q10 may also alter the body’s response to warfarin (a drug that prevents the blood from clotting) and insulin.



(From the National Institute of Health)
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