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]
Is whey protein superior to other protein sources?
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•Last Updated: May 16, 2025
Whey protein is considered superior to other protein sources like casein and soy due to its high bioavailability, rapid digestion, and rich leucine content, which leads to a greater increase in blood amino acids and more effective stimulation of muscle protein synthesis.