Doctor's Best® Best Chewable D-Ribose is a supplement that promotes proper energy levels in the heart and muscles and reduces the production of free radicals during exercise. This formula contains ribose, which is an essential 5-carbon sugar that the body needs to create DNA, RNA, and energy. Ribose is also vital for the production of adenosine triphosphate (ATP), the main energy force for skeletal and cardiovascular muscles. Research has suggested that ribose supplementation can improve cardiovascular metabolism and boost cardiac energy. Ribose has also been shown to help recover energy after exercise. This is because exercise increased the production of free radicals, and ribose may have a role in strengthening and maintaining the body’s natural antioxidant defenses.