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GHK-Cu, first identified in 1973 from mammalian plasma, functions as a naturally occurring copper-peptide complex that influences approximately 31% of the human genome, resetting gene expression patterns to favor tissue repair while delivering bioavailable copper essential for enzymatic processes underlying collagen synthesis and antioxidant defense

Treat any single number you find online as a claim to trace back to its source, not as a dose

PubMed laboratory research record [PMID: 38389158] PubMed record related to this compound for laboratory literature review

For brand-name pens: Manufacturer expiration dates allow longer storage, typically 18 to 24 months from manufacturing