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What GHK-Cu Actually Is GHK-Cu (glycyl-L-histidyl-L-lysine, bound to a copper ion) isn't a synthetic invention dreamed up in a lab it's a naturally occurring tripeptide found in human plasma, and its concentration declines measurably with age

For this reason, both GSH/Cr ratios and absolute GSH concentrations are reported

References Chang, C.H., Tsai, W.C., Lin, M.S., Hsu, Y.H., Pang, J.H

KPV: the anti-inflammatory tripeptide for immune modulation KPV is a tripeptide consisting of just three amino acids: lysine, proline, and valine