Whey Protein Isolate - Acid digested WPI offers quickly digestible amino acids and short peptides. Microfiltration processes have removed a lot of the lactose offering a higher quality serve of protein. Whey Proteins in general are recognised as whole proteins due to the inclusion of tryptophan, an important amino acid for the production of serotonin, a hormone which is essential for stable mood and sleep functions. High levels of Glutamine or Glutamic Acid increase the level of focus an athlete can achieve during a workout.