GHK Cu is one of my personal favorites for a lot of reasons, but I can say without a doubt that it's use effectively stopped and reversed, my receiving hairline. However, there are Absolute GHK cu Stem Cells & Peptide Hair Growth Serum and Shampoo MTS Mall of California GHK Cu Copper Peptide 0.5% (topical foam) Shell Medical Copper Peptide Hair Growth Serum 10% GHK Cu & 5% AHK Cu Hairgenetix