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Keep each peptide in its own vial, draw with its own syringe, and inject at separate sites
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Evidence Behind GHK-Cu for Hair Loss in the UK No large-scale randomised controlled trials have confirmed GHK-Cu's efficacy for hair regrowth in humans
Community sources consistently cite refrigeration of the punctured vial as the most reliable way to maintain stability through the full 28-day window the lower temperature suppresses any microbial growth that does occur and reduces benzyl alcohol degradation across the multi-week window
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