Alpha-lactalbumin is one of the main protein fractions in bovine and human milk. It is naturally high in the essential amino acid tryptophan, which is known to promote the synthesis of serotonin in the body. This neurotransmitter has several key roles in the body, including promoting sleep and mood. Utilizing alpha-lactalbumin in infant formula enables manufacturers to match the protein and amino acid profile of mother’s milk more closely. For adult nutrition, alpha-lactalbumin supplementation has been shown to reduce feelings of fatigue, improve memory and cognition in mentally stressed adults.