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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

In the scalp, GHK-Cu stimulates follicle activity, promotes a healthier growth environment, reduces inflammation, and supports stronger, thicker hair shafts

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Across mice, rats, fruit flies, and primates, epithalamin/Epithalon treatment extended average lifespan by 1225% depending on the model [2]