CoQ10 level may be reduced during times of intense training due to metabolic stress and elevation of free radical formation for most athletes. Therefore, the supplementations of CoQ10 will help in aerobic power, anaerobic threshold, exercise performance, and/or recovery after exercise in trained athletes and untrained individuals, and increase muscle CoQ10 concentration with 100-200 mg/day. Supplementation below this dosage may not give any effects on exercise performance as described in many studies.