Coenzyme Q-10 is a vital antioxidant that helps cells produce energy. It is especially important for the heart and muscles. It also helps replenish Co Q-10 levels that may be depleted by certain cholesterol medications (statins).Coenzyme Q-10 is a vital antioxidant that helps cells produce energy. It is especially important for the heart and muscles. It also helps replenish Co Q-10 levels that may be depleted by certain cholesterol medications (statins).