Whey Protein Isolate is the highest yield of protein currently available, it's a derivative of milk protein. Its short chains and peptides make it available for absorption within ten minutes of ingestion sometimes. It's kind of a protein booster. It is generally 90% protein by dry weight.

Whey is the best investment as a post-workout recovery supplement  because of its naturally high occurring amino acids like BCAA’s and Glutamine.  That critical time (the 2 hours following) after severe physical stress when the cells will act like a sponge and take in almost anything. The extreme hunger of the cells and the fast-acting properties of whey will make sure you use the best window for recovery to the fullest. If not, the body will hunt the stored reserves of nutrients and when on a diet for example that will cause them to rob other muscle-tissue of glutamine.