Eye twitch is not a potential side effect of taking coenzyme Q-10, according to Mayo Clinic. CoQ10 is sold as a nutritional supplement and is considered "likely safe" by experts at WedMD.
CoQ-10 is an antioxidant found naturally in the body, as stated by WebMD and Mayo Clinic. Levels decrease with age and can be raised with a nutritional supplement. CoQ-10 may be useful to help correct conditions such as high blood pressure, age-related vision loss and chronic fatigue syndrome.
Common side effects of taking CoQ10 are gastrointestinal upset, including nausea, vomiting and diarrhea, and skin rashes, according to WebMD