GHK Cu Copper Peptide Powder Cosmetic Raw Material for Beauty & Personal Care Products Amazon.com : AzulBotanicals Copper Peptide GHk Cu & Methylene Blue Infused Whipped Grass Fed Tallow Balm, Fine lines, Wrinkles, Eczema, Acne, Full body Moisturizer, For All Skin (3.4 oz) : Beauty & Personal Ward What make blue? . The blue color of GHK Cu is due to the copper ion mineral bound with the peptide. The binding occurs through the donation of electrons Amazon.com: Skin Perfection Copper Peptide Serum GHK CU 1% for Face & Hair Copper Peptides for Skin, Hair, & Scalp 1% Blue Liquid for Face, Neck, Body, Scalp Multi Use Serum Booster with Copper Peptide GHK Cu for Sale Stanford Advanced Materials