Replying to @dvine9tktok have to have GHK cu if you're going to use a TikTok The GHK Cu pen works. But needles at home were never the answer. We took the same clinically backed copper peptide complex and put it into a serum you can use in 30 seconds, GHK Cu Pinnacle Performance Labs Neurogan Health GHK Cu Peptide Serum 4% Copper Peptide for Hair, Scalp and Dry Hair Care 2400mg, Made in USA : Buy Online at Best Price in KSA Souq is