Side effects of taking CoQ10

Updated July 20, 2017

Coenzyme Q10, or CoQ10, is made naturally by your body and is important for proper functioning of your cells. Your levels of this compound decline with age and tend to be low in people with chronic diseases such as heart problems, cancer, and diabetes. This compound primarily functions to increase energy, strengthen the immune system, and protect your body from illness and infection. You can increase your intake of CoQ10 by taking supplements. The University of Maryland Medical Center says that a recommended daily dose is 30mg to 200mg per day in adults over age 19. People under 19 years should not use these supplements without a doctor's supervision. You should be aware of the side effects of CoQ10 and consult your doctor before taking it.

Mild Side Effects

According to, few serious side effects have been reported related to the use of CoQ10. Commonly reported side effects are mild and brief and may require no treatment. These can include vomiting, nausea, stomach upset, diarrhoea, appetite loss, itching, headache, dizziness, irritability, heartburn, and fatigue.

Organ Damage With Exercise

If you take CoQ10 supplements, you may need to avoid or limit engaging in vigorous exercise. People with heart disease who intensely exercise may experience organ damage while taking these supplements. This is due to a reduction in oxygen and blood flow. It is unclear how CoQ10 plays a role in this, according to the, and more research is required to establish an association.

Lower Blood Pressure

If you have low blood pressure or take blood pressure medications, you should be cautious about the use of CoQ10. This compound can decrease your blood pressure and worsen or disrupt your condition. In addition, if you have liver disease or take liver medications, you should also be cautious with CoQ10 use. Reports of raised liver enzymes have been made and this can worsen your condition. More research is required. .

Use During Pregnancy

If you are pregnant or breastfeeding, you should not use CoQ10 since it has not been shown to be safe, according to In addition, you may experience allergic reactions when taking these supplements, and this can lead to a rash or itching.

Cite this Article A tool to create a citation to reference this article Cite this Article

About the Author

Jill Andrews began writing professionally for various online publications since 2009. Andrews holds a Bachelor of Science in biochemistry/nutrition from Memorial University in St.John's, Newfoundland. She also holds a Bachelor of Science in occupational therapy from Dalhousie University in Halifax, Nova Scotia.