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Casein protein is a high-quality, slow-digesting dairy protein that accounts for 80% of the protein in cow's milk. Unlike its fast-absorbing counterpart, whey, casein forms a gel-like structure in the stomach, providing a sustained release of amino acids over 6 to 8 hours. This "time-release" effect makes it the gold standard for overnight muscle recovery and prolonged satiety.

Based on expert reviews and performance metrics, these are the leading products currently on the market: The 4 Best Casein Protein Powders of 2026 | Fortune buy casein protein