Your copper peptide product should be this exact blue. If it isn't, you already have your answer. GHK-Cu is blue because of coordination chemistry, not dye. The Cu²⁺ ion at the center US$ 24.24 Min. order: 1 piece ★★★★★ 4.6 (124 reviews) Sold : Login>>
Human Glutathione S Transferase Theta 2 (GSTt2) Protein US$ 28.97 Min. order: 1 piece ★★★★★ 4.6 (270 reviews) Sold : Login>>
Glutathione Peroxidase 3/GPX3 Antibody [Unconjugated] US$ 28.69 Min. order: 1 piece ★★★★★ 4.8 (46 reviews) Sold : Login>>
Skin Perfection GHK-Cu Copper Peptide Serum Booster, 1 Percent Blue Liquid For Face, Neck, Body, Hair, And Scalp, 0.5 oz US$ 23.23 Min. order: 1 piece ★★★★★ 4.0 (262 reviews) Sold : Login>>