is injectable ghk cu better than topical “Is GHK-Cu actually worth it?” genuinely one of the most common questions in my comments, so let me finally answer it properly., The short version: copper peptides have real research behind them, GHK-Cu Scalp Foam - Wells
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If switching the route of administration and dosage don't help, you may also have like a substrate issue

Nov 2016;32(6):631-639

[DOI] [PMC free article] [PubMed] [Google Scholar] 193.Zhang, L

I.uiS.BrajaK.MildnerB.BokuliA.itumK.et al (2007)

3.3 GHK-Cu promoted mucosal healing GHK-Cu treatment significantly enhanced of ZO-1 and Occludin expression in colitic mice, which were downregulated by DSS (Figures 4AC)
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