Say hello to your skin's new BFF GHK Cu is a powerful peptide that supports collagen production, speeds healing, improves hair growth, and helps fight visible signs of aging. This tiny molecule 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 GHK CU Sky Blue Cream Aseir Custom One of my patients has shared this picture with me as she felt it was odd that this peptide had this very vivid blue colour, while her other peptides had a clear