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GHK-Cu (Glycine-Histidine-Lysine Copper Peptide) is a naturally occurring tripeptide-copper complex found in human plasma, saliva, and urine
doi:10.1542/peds.2006-0858
Laboratory studies have demonstrated biological activity at concentrations as low as 0.01 nanomolar, showing measurable effects on fibroblast activity and collagen production even at these minute levels
And it should never be used casually without proper guidance
The enzyme glutathione synthetase (GS) is formed by two identical subunits (52 kDa/subunit) and is not regulated by intracellular levels of GSH
That's the copper ion, and it's completely normal
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