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$ 29.96 Min. order: 1 piece ★★★★★ 4.1 (249 reviews) Sold : Login>>
Thoughts on the colour of this GHK-CU 50mg (still in powder form) : r/PeptidePathways US$ 28.35 Min. order: 1 piece ★★★★★ 4.9 (157 reviews) Sold : Login>>
GHK Cu Peptide Serum – Copper Peptide Serum for Tightening, Collagen Boosting & Hydrating – Topical GHK-Cu with Hyaluronic Acid US$ 27.68 Min. order: 1 piece ★★★★★ 4.3 (138 reviews) Sold : Login>>
AHK-Cu (Copper Tripeptide-3) | Ingredient Guide US$ 27.39 Min. order: 1 piece ★★★★★ 4.9 (240 reviews) Sold : Login>>
99% Pure Copper Peptides (ghk-cu) | Great for DIY - 1 Gram US$ 24.74 Min. order: 1 piece ★★★★★ 5.0 (105 reviews) Sold : Login>>