Why Are People Injecting Themselves with Peptides? The New Yorker KLOW Blend Vial 80mg BPC 157 TB 500 GHK Cu Pure Bio Labs 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 Subcutaneous Injection Sites and Instructions for Safe Self Administration KLOW is a stacked compound rather than a single peptide, meaning it combines several agents for better results: , 1. BPC 157: The Repair Engine for connective tissue, tendons, and ligaments , 2.