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Overview GHK-Cu (Glycyl-L-Histidyl-L-Lysine Copper complex) is an endogenous tripeptide that binds copper(II) ions with high affinity and is present in human plasma at concentrations that decline markedly with age from roughly 200 ng/mL at age 20 to approximately 80 ng/mL by age 60

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Look for formulations that clearly list Copper Tripeptide-1 in the ingredient list and are transparent about concentration levels

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The letter states that until FDA confirms compliance with current GMPs, the agency may delay or withhold approval of any new applications or supplements listing the firm as a drug manufacturer

Collagen peptides are often found in protein powders or supplements that are meant to be ingested