Whey proteins are mainly composed of several proteins, including:
- Gamma globulins and alpha lactoglobulins, which are major whey proteins found in the milk of mammals.
- Beta lactoglobulins and lactalbumin are other types of whey proteins found in significant amounts.
- Casein is the major protein in milk, but it is not a whey protein, as whey proteins are the liquid portion separated from curds when milk is processed.