Coenzyme Q10 supplements have many theorized uses. This vitamin-like nutrient, also called CoQ10, may be helpful for people who get migraine headaches or who have certain cardiovascular conditions, Parkinson's disease, muscular dystrophy, mitochondrial disorders or HIV/AIDS, according to MedlinePlus. While most people tolerate coenzyme Q10 well, it can cause medical side effects. Consult a qualified health care provider before taking coenzyme Q10.
Digestive Side Effects
Relatively mild digestive side effects are possible when taking coenzyme Q10 supplements. Some people experience loss of appetite, heartburn and associated throat and esophagus discomfort, upset stomach, diarrhea, nausea or vomiting.
Blood Pressure Effects
Because coenzyme Q10 supplements may lower blood pressure, MedlinePlus recommends checking your blood pressure regularly while taking coenzyme Q10 if you have low blood pressure. If you take medication to control high blood pressure, coenzyme Q10 supplements could cause your blood pressure to drop too low. Signs of low blood pressure include dizziness or fainting, effects that are more likely when standing up or when sitting up from a prone position.
Effects on Blood
Coenzyme Q10 may reduce the effectiveness of medications with blood-thinning properties, according to the University of Maryland Medical Center. If you take warfarin, clopidogrel, heparin or other blood-thinning medicine, only take coenzyme Q10 with your doctor's approval and close supervision.
Allergic Reaction
Some people have an allergic reaction to coenzyme Q10 supplements. Signs of an allergic reaction to this substance may include itching, a rash, hives, unexplained swelling, and trouble breathing or swallowing. You should consider an allergic reaction to coenzyme Q10 supplements a medical emergency.
Considerations
The FDA does not regulate supplements as strictly as it does medications. Some dietary supplements are found to have contents or levels of ingredients that do not accurately match the labels, according to eMedTV. You should purchase coenzyme Q10 and other supplements only from reputable manufacturers to avoid any side effects that could occur due to added ingredients, contaminants or different levels of the supplement than are posted on the label.
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