D-ribose is a simple sugar your cells use to build adenosine triphosphate, or ATP, the main fuel for heart and skeletal muscle. By helping restore ATP levels, it supports energy recovery in tissues that work hard and burn through energy quickly.
Most people dissolve D-ribose powder in water or juice and take it before or after exercise. Others use it daily to maintain cardiovascular and muscular energy. While many tolerate it fine, some notice mild stomach upset or dips in blood sugar.