D-Ribose is a naturally occurring sugar that plays a crucial role in the production of energy within cells. It is a key component of ATP (adenosine triphosphate), which is the primary energy carrier in all living organisms. D-Ribose helps replenish energy stores, especially after intense physical activity or during periods of fatigue. Supplementing with D-Ribose may benefit individuals with certain health conditions, such as chronic fatigue syndrome or fibromyalgia, by improving energy levels and reducing muscle soreness. It is also studied for its potential effects on heart health, particularly in patients with ischemic heart disease.