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10.1007/s00167-009-0828-7 Knee Surg

Formulation and Delivery GHK-Cu appears to pass the skin's horny layer (stratum corneum) in quantities sufficient to activate regenerative events

A 2023 safety trial (n=200) confirmed no hepatotoxicity or allergy beyond 1% (Babu et al., 2023)

Because GHK-Cu seems to talk directly to fibroblasts, and because the body stocks less of it with age, fibroblasts are an obvious candidate for studying how this peptide might affect aging tissue

Problem: Increased Fine Lines or Wrinkles Temporary increase in fine lines during weeks two through six can reflect normal collagen remodeling