A dietary supplement which is formulated for medical patients, particularly cancer patients undergoing a chemotherapy treatment regimen. The ingredients are formulated in a form which is easiest for the patient to digest, with consideration of the damage that chemotherapy causes to the digestive system. The dietary supplement provides an ample and well-balanced source of essential and non-essential amino acids, as well as vitamins and minerals. The amino acids are preferably provided in the form of free amino acids, which can be directly absorbed into the bloodstream without digestion. The supplement is formulated in such a manner that it can be used as the sole nutritional source for substantial periods of time.