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 GHK Cu Hair & Scalp Serum 2400mg 4% Less Shedding Neurogan Neurogan Health Copper Peptide Hair Growth Treatment Serum, GHK Cu and AHK Cu, Licorice Extract,1oz Haircare Comfort TikTok Shop Cellular Glow Hair Serum 10% GHK Cu + 5% AHK Cu Peptides