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 Dosage and Protocol: A
Description
I.uiS.BrajaK.MildnerB.BokuliA.itumK.et al (2007)

If switching the route of administration and dosage don't help, you may also have like a substrate issue

It l expensive

While these injections are generally safe with minimal side effects, you may experience mild soreness or redness at the injection site

GHK-Cu is identifiable by its distinct deep blue color, both as a lyophilized powder and in solution a visual indicator that copper is properly complexed with the peptide