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Copper Peptide Products Versus Retinoids and Cosmetic Actives Cu-GHK has been compared with vitamin C and retinoic acid in a small collagen-production context summarized in a topical peptide review, where collagen increased in 70% of Cu-GHK-treated participants versus 50% with vitamin C and 40% with retinoic acid after one month [2]
Storing a vial on its side or inverted keeps the solution in sustained contact with the rubber stopper, which pharmaceutical literature describes as a potential leachable-contamination pathway over extended periods
Known copper allergies also preclude GHK-Cu use
It is important to follow the dosage instructions provided by your healthcare provider
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