The GHK Cu Peptide: Benefits, Uses, and Why it's Known as the Regenerative Copper Complex GHK Cu Peptide: Hair Regrowth for Thinning & Alopecia SKIN WHITENING GLUTATHIONE 2000mg Per Serve Brightening Lightening Pills 120 Cap eBay Your copper peptide product should be this exact blue. If it isn't, you already have your answer. GHK Cu is blue because of coordination chemistry, not dye. The Cu ion at the center