I get a lot of questions about our SuperPeptide Serum specifically why it's such a vibrant shade of blue. Swipe through to learn why that Deep Sapphire is a marker of 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 Blue Copper Ghk cu Peptide Manufacturers Suppliers Factory Salispharm Effect of high dose N acetyl cysteine on the clinical outcome of patients with diabetic peripheral neuropathy: a randomized controlled study Diabetology & Metabolic Syndrome Springer Nature Link