Coenzyme Q10, found naturally in the body, helps make important molecules involved with energy, muscle contraction and the production of proteins. The compound, also known as CoQ10, enhances the immune system and works as an antioxidant protecting against free radicals that damage cells. CoQ10 may help prevent or treat heart disease, high blood pressure, high cholesterol, gum disease and other health problems when used as a supplement or in combination with other drug therapies, according to the University of Maryland Medical Center. Side effects may occur for some people.
Mild Reactions
CoQ10 may produce mild and brief side effects. Treatment usually isn't necessary. Nausea, vomiting and upset stomach may occur. Some people report headaches, irritability, an increased sensitivity to light, insomnia, fatigue or flu-like symptoms. The supplements may cause heartburn or throat pain from acid reflux, diarrhea and loss of appetite. Allergic reactions may include hives, rash, swelling of the throat and breathing problems. Dizziness, fainting or sudden allergic reactions may concern some people, who can call for immediate medical attention, LoveToKnow notes.
Lowers Blood Sugar
People with diabetes or hypoglycemia, referred to as low blood sugar, should take CoQ10 with caution, MayoClinic.com explains. CoQ10 may lower blood sugar levels. Monitoring glucose levels avoids problems when taking CoQ10. Doctors may readjust medications or advise avoiding the supplements. Certain medications, herbs and supplements can affect blood sugar and CoQ10 may compound the problem.
Decreases Blood Pressure
Several clinical studies have shown that CoQ10 may lower blood pressure without significant side effects, according to the University of Maryland Medical Center. The promising research would have a positive effect for people with high blood pressure. However, people with low blood pressure or taking blood pressure medication may have adverse effects from CoQ10. A doctor can recommend taking the supplement or not.
Organ Damage
Reported cases of organ damage from lack of oxygen and blood flow during intense exercise by heart disease patients may involve CoQ10, but the role of the supplement is not clear, MayoClinic.com points out. Doctors may recommend avoiding strenuous exercise when taking CoQ10. In rare cases, elevations of liver enzymes that can lead to liver damage occur when using CoQ10. Physicians may advise against the supplements for people with liver disease or taking medication that may harm the liver.
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