Coenzyme Q10 is naturally concentrated in the mitochondria of cells—the powerhouses of energy production—where it helps in the complicated process of converting food into energy. As a supplement, it can boost energy and endurance levels for physical work or exercise. Particularly beneficial for people over 40, whose natural production of coenzyme Q10 has declined.

How to take: As little as 30 mg a day can increase energy levels; this is a good place for the average person to start. Safe to increase up to 200 mg a day, if desired. Coenzyme Q10 can take up to 2 months to have an effect.