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Are there any side effects of taking a CoQ10 supplement?

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Quick Answer

When taken as a supplement, Coenzyme Q10 has a number of possible side effects such as affecting liver enzymes, changing the effectiveness of certain medications, and causing rashes or itching, according to Mayo Clinic. It may also cause nausea, vomiting, headaches and low blood sugar.

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Full Answer

Coenzyme Q10 is safe when taken in doses up to 3,000 milligrams, explains Mayo Clinic. It can be taken daily for up to eight months for those who are healthy. However, caution should be used if taking more than the recommended dose or for longer periods of time. Caution should also be used by those with liver problems, as daily doses over 300 milligrams may raise liver enzymes.

Those who have stomach disorders may have side effects from Coenzyme Q10, including vomiting, nausea and upset stomach, states Mayo Clinic. Mobility issues can be a side effect of Coenzyme Q10 for those who have mitochondrial disorders. Headaches and blood sugar issues are possible when taking this supplement, as are issues with the thyroid and heart rate. In addition, Coenzyme Q10 may cause side effects such as backache, abnormal breathing, bronchitis and changes in cholesterol. Runny nose, sore throat, inflamed sinuses and heartburn may also occur when taking Coenzyme Q10.

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