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10.1007/s00535-017-1407-1 J

GHK-Cu at InjectCo is prescribed exclusively for topical cosmetic use

Night-time application and alternating frequency (2-3 times weekly initially) may help minimize sensory irritation and erythema in darker skin phenotypes

Its generally considered usable for several weeks after opening when stored correctly, though this can vary depending on the specific product and manufacturer guidance

Understanding GHK-Cu's tolerability requires being honest about the boundaries of the evidence

The FDA has issued warning letters to peptide vendors, and states like Ohio have pursued enforcement against BPC-157 products specifically