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Reduced brain serotonin function is acknowledged as a vulnerability factor for affective disturbances. Since the production of serotonin is limited by the availability of its plasma dietary amino acid precursor tryptophan (TRP), the beneficial effects of tryptophan-rich alpha-lactalbumin whey protein (ALAC) have recently been studied. The effects of ALAC remain rather modest, and alternative protein sources of tryptophan may be more effective.

Effect of different tryptophan sources on amino acids availability to the brain and mood in healthy volunteers