The form of GHK Cu you use may matter more than the peptide itself. Which form of GHK Cu have you personally tried before and what was the FIRST noticeable change you experienced? Copper Peptides for Hair Loss: How GHK Cu Can Stimulate Hair Growth HapiPatch GHK Cu Peptide Serum: Copper Peptides for Skin Firmness Mythos Mythos Skincare Copper Peptides Which One Do I need? GHK or SRCP Scars Antiaging Tightening A Dermatologist's Take on the Copper Peptide (GHK Cu) Trend