How is protein powder made?

Protein powder can be made from the following sources:

1. Whey: high levels of all the essential amino acids not produced by the human body, and is absorbed by the body very quickly
2. Egg: white protein is a lactose- and dairy-free protein
3. Soy: contains all essential amino acids, and is an alternative protein for vegetarians
4. Casein: rich in glutamine, an amino acid that aids in recovery, and has casomorphin which helps the body to absorb the amino acids over a long time
5. Hemp seed: contains complete and highly-digestible protein and hemp oil is high in essential fatty acids

These sources are concentrated, then processed into the powdered form, to be reconstituted into a liquid form (protein shake, mixed with fruit juice or milk).