Glutathione Injections The Power of Blue: Why GHK Cu Is the Unsung Hero of Youth Let's talk about the blue magic no one's talking enough about GHK Cu peptide (that gorgeous blue serum you've Why Is Glutathione Added as a Push? Glutathione IV Power 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 L Glutathione Glutathione Supplement Glutathione Reduced