Nutritional Fundamentals for Health, D-Ribose SAP, 17.6 oz (500 g)D Ribose is a natural 5 carbon sugar found in all living cells. The body naturally produces d ribose, which begins the metabolic process for cellular energy production via adenosine triphosphate (ATP). The production of ATP, either through the synthesis of new energy or via the salvage pathway of energy preservation, is rate limited by the availability of d ribose. d Ribose supplementation can support increased metabolic demands, reduce exercise