Coenzyme Q10 (COQ10) is an essential vitamin-like substance that has important antioxidant and energy-producing properties. It supports cardiovascular and organ health. COQ10 fights free radicals, aids heart health, and increases energy. Good sources of COQ10 include meats like beef and fish. Vegetables such as broccoli and spinach also contain COQ10. If dietary sources are not enough, supplements provide an effective way to increase COQ10 intake.