Sis whey20 is made from whey protein all other protein products on the market use collagen as the protein source either from animal or fish skin the use of whey protein as the protein source makes the taste superior to collagen based products the amino acid profile is also superior in whey versus collagen whey based proteins are naturally high in the branched chain amino acids leucine isoleucine and valine which are essential building blocks for the growth and development of lean muscle