Whey protein concentrate 80 % (WPC-80) is produced by filtering liquid whey to remove most fat and lactose while keeping the protein fraction. The result is roughly 80 g protein per 100 g powder, with the remainder being moisture, residual lactose, minerals and a small amount of fat. Unlike whey isolate (typically 90 %+ protein, lower lactose) or casein (slow-digesting), WPC-80 offers a balance of cost, taste neutrality and rapid absorption. Whey naturally contains all nine essential amino acids and is particularly rich in branched-chain amino acids — leucine, isoleucine and valine — which are key triggers for muscle protein synthesis after exercise. The authorised nutrition claim states that protein contributes to the growth and maintenance of muscle mass. Because it digests quickly, WPC-80 is commonly used after training or between meals when a fast amino acid supply is desired; casein or whole-food proteins are better suited for sustained release (e.g., before bed).
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