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 What does Whey Protein do?

Whey protein is a mixture of some of the proteins naturally found in milk. The major proteins found in whey protein include beta-lactoglobulin and alpha-lactalbumin. Whey protein has one of the highest protein digestibility-corrected amino acid scores (PDCAAS; a measure of protein bioavailability) and is more rapidly digested than other proteins, such as casein (another milk protein). ¹

Alpha-lactalbumin is a whey protein high in the amino acid tryptophan, which the body uses to make the neurotransmitter serotonin. A double-blind study found that supplementing the diet with alpha-lactalbumin helped improve scores on a memory test in people who were vulnerable to experiencing problems with stress.² The researchers speculated that the alpha-lactalbumin raised brain serotonin levels in these subjects, which may have improved their tolerance to stress.