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A 2018 review in the International Journal of Molecular Sciences analyzed available gene expression data and found that GHK-Cu at clinically relevant concentrations affected the expression of approximately 31.2% of human genes [2]
The presence of cysteine, with the thiol group (-SH), gives glutathione a remarkable ability to oxidize, an ability that is used in living systems to neutralize oxidizing substances such as oxygen radicals, preventing the latter from reacting to damage important biological molecules, such as enzymes or nucleic acids
It is made of three essential amino acids (cysteine, glutamate, and glycine)
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