Different Types of Peptides in Skincare & What They Do Medik8 Klow Blend 80mg BPC 157, TB 500, KPV, GHK Cu Bluewell Peptides KLOW PEPTIDE is a POWERFUL formulation that combines four of the most clinically recognized compounds; GHK Cu, BPC 157, TB 500, and KPV. While these individual peptides offer targeted support on their own, their true 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