Fleava GHK Cu Hair Regrowth Serum Brand New Sealed Authentic Hair Loss Copper eBay Certificates of Authentication TNN Peptides Quality & Verification How long will a 50 mg supply of GHKCu last when dosing 2 mg daily for five consecutive days followed by two days off each week? Enhanced 12 weeks in, and my skin has NEVER looked better! GHK peptides are doing their thing. Alright, I need to give you an updateit's been 12 weeks since I started using GHK