Skip main navigation



What is Coenzyme Q10 and is it safe?


Coenzyme Q10 (also known as CoQ10) is a vitamin-like chemical produced in the body from the amino acid tyrosine. Tyrosine and CoQ10 are also present in a variety of foods like soy oil, peanuts, organ meats and sardines. Coenzyme Q10 is important for the body to function normally. Some claim CoQ10 can help people with unhealthy gums, low energy, poor immune systems, and even cancer and heart failure.

Coenzyme Q10 is a relatively safe supplement, but about one percent of the population has reported side effects. These reported CoQ10 side effects include upset stomach, diarrhea, headache, appetite loss, dizziness, irritability, itching or skin rash, as well as nausea. These side effects go away after stopping Coenzyme Q10 or lowering the dosage. Another side effect of CoQ10 is that it may change the insulin requirements of people with diabetes. Speak with your doctor if you have diabetes and are considering taking Coenzyme Q10.

Shop Coenzyme Q10 products available on

Back to Ask a Pharmacist


Answers to questions regarding information about medications or health conditions are not for diagnostic or treatment purposes and are not conclusive as to the presence or absence of any health condition. Consult your physician for diagnosis and treatment of your medical condition. The information provided is not a substitute for medical advice. Advances in medicine may cause this information to become outdated, invalid or subject to debate. Professional opinions and interpretations of the scientific literature may vary. Walgreens' terms of use and general warranty disclaimer apply to all services provided. If you are in need of immediate medical attention, contact your physician, poison control center or emergency medical professional. If you need to speak with a pharmacist for non-emergency matters, contact your local Walgreens pharmacist or call a pharmacist toll-free at 1 (877) 250-5823.

Your Digital Health Advisor. Powered by WebMD. Manage diabetes with this easy online tool.* Get started.
Your Digital Health Advisor. Powered by WebMD. Manage diabetes with this easy online tool.* Get started.

Balance Rewards for Healthy Choices

20 Points
20 Points

Now you can track your blood pressure and blood glucose.

Start earning points Go Arrow