What are whey proteins?

Whey proteins are a collection of globular proteins present in whey (whey is produced when milk is separated into solid curds and liquid whey e.g. in cheese making). Whey proteins account for about 20 % of the total protein in cow’s milk (about 0.65 g per 100 ml). It also contains the Branched Chain Amino Acid (BCAA) leucine, which makes whey protein a valuable ingredient in the sports nutrition industry.