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 Copper Peptide, Face Cream, 2 oz (60 ml) Amazon.com: BLUPROTIN Copper Peptides Serum for Face, GHK CU Peptide with Propylene Glycol&Copper Tripeptide 1&Hyaluronic acid, Anti Aging Anti Wrinkle Moisturizing Restore Collagen Enhance Skin Elasticity 30ml : Beauty & Personal Care GHK Cu Injectable Team Wellcore My experience learning about GHK Cu for skin support & recovery Sharing what I personally use not medical advice. Always consult a professional before trying peptides. Curious if anyone else here Ghk Cu Shampoo Copper Peptide Hair Growth Best Peptide for Hair Growth Copper Peptide Shampoo