GHK Cu Copper Peptide Hair Growth Serum Blackbird Skincare: Custom Skincare & Beauty Manufacturer Tailored Solutions for Every Brand A GHK Cu face serum appears blue because the active ingredient, GHK Cu (copper peptide), is naturally a blue colored powder, meaning its inherent color transfers to the serum when mixed in; this blue hue , GHK CU + ZINC ( ), 60 OZON (2939132408) Amazon.com: The Ordinary Multi Peptide + Copper Peptides 1%, Anti Aging Serum for Fine Lines and Skin Elasticity, 1 Fl Oz (Pack of 2) : Beauty & Personal Care
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