Product Short Description: CASEIN Product Description: Casein protein provides the body with all of the amino acids necessary to help build muscle. Casein protein is digested more slowly than other proteins, so it might be better at reducing appetite and increasing feelings of fullness.Casein protein provides the body with all of the amino acids necessary to help build muscle. Casein protein is digested more slowly than other proteins, so it might be better at reducing appetite and increasing feelings of fullness.