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10.3390/ijms20040867 29 EsteghamatiA.Hafezi-NejadN.ZandiehA.SheikhbahaeiS.EbadiM.NakhjavaniM

The brain uses three amino acids tryptophan, tyrosine, and phenylalanine to make the three major neurotransmitters (serotonin, dopamine, and norepinephrine).26 But a 2020 study found seven amino acids that could potentially improve older adults cognitive, social, and psychological functioning: leucine, lysine, isoleucine, histidine, valine, phenylalanine, and tryptophan.27 Similar to NALT for tyrosine, you might see some of these amino acids listed as acronyms

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It also highlights the importance of taking supplements in moderation rather than in excessive amounts

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