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Milk whey is known for having the highest digestibility rate among protein sources due to its rapid absorption and high bioavailability. Whey protein is derived from the liquid that separates from curds during cheese production. The composition of whey protein is rich in essential amino acids, especially branched-chain amino acids (BCAAs), which are crucial for muscle repair and recovery.

The digestibility of protein is often assessed through the Protein Digestibility-Corrected Amino Acid Score (PDCAAS) or the Digestible Indispensable Amino Acid Score (DIAAS). Whey protein generally scores very high on these scales, indicating that it is not only well digested but also provides a balanced profile of amino acids that can be effectively utilized by the body.

Compared to casein, which is also a milk protein but is digested more slowly, whey offers quicker nutritional availability, making it advantageous for recovery post-exercise. While beef and egg proteins are also high-quality sources, they typically have slightly lower digestibility rates than whey protein. Therefore, whey protein stands out as the most quickly and efficiently absorbed source of protein available.