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ghk-cu hair growth clinical studies evidence PDF) The effect of tripeptide-copper complex on human in vitro GHK-Cu for Hair Loss: Clinical
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Supplied for in-vitro laboratory research use only (RUO)

Published protocol Mouse: 5 mg/kg intraperitoneal, repeated over weeks (Baar et al., 2017)

[DOI] [PMC free article] [PubMed] [Google Scholar] 71
The shorter estimate (21 days) provides safety margin