Beyond protein quantity: Why whey and casein matterExplore related questionsNyakayiru compared different protein sources, noting that whey protein contains a higher level of essential amino acids than collagen protein. Muscle protein synthesis (MPS) is the process by which the body builds and repairs muscle proteins. “Although whey protein is often regarded as the gold standard, casein protein actually demonstrates a very high protein quality. Beyond selecting different protein types, researchers are also exploring whether protein dose and consumption pattern influence muscle protein synthesis. “Conventional thinking suggested that approximately 20–25g of protein represented the maximum amount that could effectively stimulate muscle protein synthesis.