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 Glow Blend 70mg BPC 157, TB 500, GHK Cu Bluewell Peptides Neurogan Health, GHK Cu Copper Peptide, Hair & Scalp Serum Thoughts on the colour of this GHK CU 50mg (still in powder form) : r PeptidePathways
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