ghk-cu long-term use tolerance downregulation may Prevent Oxidative Stress in Skin by Regulating Copper and Modifying Expression of Numerous Antioxidant Genes GHK-CU aka the beauty peptide.
Description
The problem is that number comes from population averages, and your cells dont care about averages
However: all potency data is from animal models

VITAMINE B12, INTRODUCTION ET SOURCES DITTIQUES 2

[DOI] [PMC free article] [PubMed] [Google Scholar] 22.Sikiric P, Seiwerth S, Brcic L, Blagaic AB, Zoricic I, Sever M, Klicek R, Radic B, Keller N, Sipos K, et al

This is one of the most common points of confusion in skincare

What they did: Obese mice received AOD-9604 orally (via gavage) for 14 days at various doses (50, 250, 500 g/kg)
