ghk cu stimulates collagen GHK-Cu Peptide for Anti-Aging & Support - Copper Peptides Serum for Face Unlocking the Secrets of GHK-Cu:

It functions as a major intracellular antioxidant and plays a critical role in cellular detoxification, oxidative stress reduction, and immune support

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Reviews from the originating group refer to the peptide having been used in small early-stage human studies in inflammatory bowel disease and other settings with no reported toxicity, but these were limited in size and scope and do not constitute the kind of controlled safety-and-tolerability program (single- and multiple-ascending-dose Phase 1 studies with systematic adverse-event capture) that establishes a human safety profile

doi: 10.1016/j.nut.2019.01.007