Doctor's Best® Best D-Ribose is a dietary supplement that keeps the heart’s energy levels healthy and reduces the amount of free radicals formed during exercise. This supplement’s main ingredient is ribose, a sugar that the body uses to generate energy and produce DNA and RNA. Ribose is also a key component of adenosine triphosphate (ATP), which the body uses to store energy within cells. ATP is the primary source of energy for skeletal muscle and heart tissue. Research has proven that ribose supplementation has the potential to improve cardiac energy levels and support cardiovascular metabolism. Furthermore, ribose can help your body recover energy after exercise by defending cells against free radicals that are produced during exercise.