Glycomacropeptides (GMP): Whey protein is obtained from milk from one of the initial steps in the process of making cheese. During this process, one of the milk proteins, called casein (kappa casein) is split. GMP is the resulting composition of a certain amino acid sequence from this product. GMP supplementation has been shown to increase levels of cholecystokinin, a stomach secretion that plays a role in regulating feelings of fullness. GMP also may help to prevent dental cavities, and protect against viruses and bacteria.