Reddit asked questions. Here are answers. GHK Cu isn't newit's just not heavily marketed for hair (yet). Dr. Loren Pickart discovered it in the 70s. Decades of clinical research. Solid mechanism. We screwed Amazon.com: TOSOWOONG Copper Peptide 12 Cream, 99% Purity of Copper Tripeptide 1, GHK Cu, 12 Multi Peptide Powerful Anti Aging Formula for Fine Lines, Firming, Skin Elasticity, Korean Skincare, 50ml 1.69 fl.oz. : Beauty The ingredient researchers study. The serum Reddit actually recommends. GHK Cu keeps showing up in the same places PubMed threads, r SkincareAddiction, dermatology deep dives. Not because a brand paid for placement. Because the Frontiers Exploring the beneficial effects of GHK Cu on an experimental model of colitis and the underlying mechanisms NL GHK Cu (TETRAPEPTIDE + CU) Synthagen Synthagen PL GHK Cu Dosage and Protocol: A Medical Provider's Guide to the 30 Day Cycle Perfect B