Neurogan Health GHK Cu Copper Peptide Hair & Scalp Serum 4% Serum, 2 oz 60 mL TikTok Shop Before vs. after 3 months of GHK Cu peptide therapy smoother texture, more even tone, and skin that looks healthier overall. Small peptide, big difference Neurogan Health GHK Cu Copper Peptide (Ingredients Explained) GHK Cu LVLUP Health GHK Cu is one of the most powerful regenerative peptides for skin, hair, and overall tissue health. GHK Cu supports collagen production, healing, and visible rejuvenation from within. It's commonly used to improve skin