Adenosine triphosphate (ATP) is often referred to as the energy currency of life because the amount that we have in our tissues determines how much energy we have. It is needed to help our muscles squeeze, hearts pump, brains think and countless actions that we don't consciously control. D-Ribose is the key building block of ATP, therefore the availability of D-Ribose is vital for energy production and recovery. When the cells in muscles such as the heart come under metabolic stress, they are unable to synthesise enough D-Ribose and as a result, energy levels are depleted, which can lead to fatigue and exhaustion. D-Ribose supplementation has been known to boost heart muscle function. Better heart muscle function after D-Ribose supplementation supports better blood transport to muscles, revving them up for increased activity. Increased ATP levels in muscle can help to reduce pain and fatigue that prevent people from maintaining exercise regimens. D-Ribose is often used by sports people to enhance athletic performance, but can also be used on a daily basis by anyone who wishes to boost their energy levels.