Coenzyme Q10 (CoQ10) is an antioxidant that your body produces naturally. Your cells use CoQ10 for growth and maintenance. Foods rich in CoQ10 are meat, fish, and nuts. The amount of CoQ10 found in food sources isn’t enough to significantly increase CoQ10 levels in your body. CoQ10 dietary supplements might help prevent certain heart conditions, prevent migraine headaches, and improve energy levels.