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$ 22.54 Min. order: 1 piece ★★★★★ 4.8 (94 reviews) Sold : Login>>
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 US$ 20.63 Min. order: 1 piece ★★★★★ 4.6 (176 reviews) Sold : Login>>
superPeptide 1% GHK Copper Peptide Serum US$ 21.04 Min. order: 1 piece ★★★★★ 4.7 (118 reviews) Sold : Login>>
Blue Copper Peptide Ghk Cu 99% Care Ghk-Cu 50mg 100mg vials Cosmetic Ingredient US$ 26.38 Min. order: 1 piece ★★★★★ 4.4 (110 reviews) Sold : Login>>
Copper Peptide Serum for Dull & Mature Skin US$ 23.39 Min. order: 1 piece ★★★★★ 4.4 (230 reviews) Sold : Login>>