GHK Cu Facial Serum Empower Pharmacy GHK Cu (Copper Peptide) Provider Supervised Therapy IV Glow Bar 7 days on GHK Cu. Here's my honest update. I'm not going to hype this up because the real results don't even start until week 46. But something is already happening. GHK Cu Therapy: Skin Rejuvenation & Healing 7 days on GHK Cu. Here's my honest update. I'm not going to hype this up because the real results don't even start until week 46. But something is already happening.