Whey protein is highly bioavailable, rich in essential amino acid (including leucine), and quickly digested. Consuming whey causes a larger increase in blood amino acids than does casein or soy protein. And, both at rest and after exercise, whey protein stimulates muscle protein synthesis (MPS) to a greater degree than casein and soy — likely due to the quicker digestion and/or higher leucine content of whey hydrolysate.[1]
References
- ^Tang JE, Moore DR, Kujbida GW, Tarnopolsky MA, Phillips SMIngestion of whey hydrolysate, casein, or soy protein isolate: effects on mixed muscle protein synthesis at rest and following resistance exercise in young menJ Appl Physiol (1985).(2009 Sep)