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 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 Amazon.com: Copper Peptides GHK Cu Hydra Serum with Hyaluronic Acid Facial Serum for Tightening, Collagen Support, Renewing, Elasticity & Smooth Youthful Looking Skin (30ml 1fl.oz) : Beauty & Personal Care GHK Cu Blue Copper Peptide + Betaine Serum Wonderlini exquisite skincare Neurogan Health, GHK Cu Copper Peptide, Hair & Scalp Serum