Whey protein is one of the two proteins found in dairy products, the other being casein. Whey makes up 20% of the protein found in milk, but it’s the superior protein for muscle building because it’s absorbed quickly and causes a large and fast spike in blood amino-acid levels, which is exactly what you want when your body is looking to repair and build muscle fibers after exercise. Whey protein is rich in both glutamine—the most abundant amino acid in muscle—and branched-chain amino acids, which can fuel working muscles during exercise. One of the best dietary sources of whey protein: ricotta cheese.
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