GHK Cu Hair & Scalp Serum 2400mg 4% Less Shedding Neurogan Neurogan Health GHK CU QRP Nutrition 50 mg Copper Peptide 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? GHK Cu vs AHK Cu: Which Copper Peptide Is More Effective? GHK Cu Peptide: Hair Regrowth for Thinning & Alopecia GHK cu Cosmetic Topical 1g Ampules Research Use Only