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Conservative recommendation: keep vitamin C supplementation at or below 500 mg on days of GHK-Cu injection, or take high-dose vitamin C at least 3 hours apart from the injection

Silva, M

If youre curious about trying a GHK-Cu serum or other copper peptide skin care products: Look for formulations containing copper peptides (around 0.11% is typical in cosmetic products as higher percentages are less commonly standardised)

Muscle strains and soft tissue injuries often have a different recovery timeline than tendons, and people sometimes look for approaches that can support faster return to training without constant re-aggravation

However, long-term use may increase the risk of squamous cell skin cancer and melanoma (Archier 2012)