GHK Cu 100mg BT 7 GHK CU 100MG blueridgepeptides.com The Pretty Purple Peptide with Powerful Benefits, That gorgeous blue purple solution isnt just for looksits GHK Cu, one of the most studied peptides in regenerative medicine. , Heres what it 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