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Phenylalanine, tryptophan, and tyrosine act as precursors to neurotransmitters including dopamine and serotonin [55]

PMID: 42 LeclercqSStrkelPDelzenneNMDe TimaryP

Chem Commun (Camb) 51(12):22532255 Ozer HK, Dlouhy AC, Thornton JD, Hu J, Liu Y, Barycki JJ, Balk J, Outten CE (2015) Cytosolic Fe-S cluster protein maturation and iron regulation are independent of the mitochondrial Erv1/Mia40 import system

These B vitamin deficiencies inhibit the activity of immune cells by interfering with methylation and other metabolic processes

While GHK-Cu affects 31.2% of genes, gene expression changes in laboratory conditions do not guarantee the same magnitude of effect in living humans applying a topical product

Plasma or serum in therapeutic drug monitoring and clinical toxicology