GHK Cu is a naturally occurring tripeptide in human plasma. Levels average 200 ng ml at age 20 and drop to 80 ng ml by age 60 (Pickart et al., 2020). That decline tracks with Peptide Series #6 GHK Cu Tighter Smoother Skin. Your body naturally produces this copper binding peptide. At age 20, your plasma levels are around 200 ng mL. By age 60 they've dropped Repair & Glow Peptide Therapy in Chicago BPC 157 + TB 500 + GHK Cu at Better Med Spa GHK Cu Copper Peptide Injections: Advanced Skin Rejuvenation How to Use GHK Cu Peptide for Hair and Skin: Best Practices for Anti Aging & Hair Regrowth Unlocking Youthful Skin: The Potential Of GHK Cu And Retinol Drip Hydration