D-Ribose can be converted into glucose. D-Ribose can form pyruvate, which is useful in the energy production cycle. D-Ribose can form nucleotides such as ATP. D-Ribose helps muscles to recharge their energy within a day rather than the 4 or more days it usually takes. D-Ribose is a carbohydrate naturally found in all cells of the body. Physical stress can increase the loss of nucleotides (such as ATP, ADP and AMP) from the heart and skeletal muscles. Ribose metabolizes into 5-phophoribosyl-1-pyrophosphate (PRPP), which is a rate limiting substance used in the synthesis of nucleotides. D Ribose is also widely recommended by specialist practitioners for sufferers of M.E. and related symptoms. Please not your GP/Practitioner may recommend a different daily amount, based on your individual case