Benefits of CoQ10 - Improves cardiac activity and treats cardiac failure - Helps reverse age-based infertility in males and females - Protects skin against internal and external damages by anti-oxidant action - Helps prevent and treat migraines and headaches - Boosts physical activity and athletic performance - Controls diabetes - Protects the cellular structures and DNA thus prevents cancer - Improves brain activity - Improves activity of lungs Side effects of CoQ10 - Stomach ache - Headache - Loss of appetite - Exhaustion and fatigue - Diarrhea - Weakness - Dizziness - Nausea - Vomiting - Irritation - Rashes Dosage of CoQ10 90-200 mg is the safe dose of CoQ10. However, the dosage varies depending upon general health of individual and the purpose.