ghk-cu hair clinical trial AHK-Cu Copper Peptide Growth Study (2007) — Plain-Language Summary ghk-cu hair growth evidence clinical
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PMID 16230138

It follows that we cannot exclude that the study failed to achieve the primary endpoint because of a low statistical power

doi: 10.1152/physrev.00020.2012

Cochrane Handbook for Systematic Reviews of Interventions: Cochrane Book Series
