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 One of my patients has shared this picture with me as she felt it was odd that this peptide had this very vivid blue colour, while her other peptides had a clear Neurogan Health, GHK Cu Copper Peptide, Hair & Scalp Serum Copper Peptide Serum for Dull & Mature Skin VALNCIA AHK CU + GHK Cu Hair Serum Pro 4800mg Hair Growth Neurogan GHK Cu Copper Peptide Serum with Niacinamide, Hyaluronic Acid and Mushroom Extract 1% Copper Tripeptide 1 Anti Aging Formula, 1 oz