GHK-Cu: The Copper Peptide

GHK-Cu (glycyl-L-histidyl-L-lysine copper complex) is a naturally occurring tripeptide-copper complex found in human plasma, saliva, and urine. GHK-Cu levels decline significantly with age, from approximately 200 ng/mL at age 20 to 80 ng/mL by age 60. This decline correlates with reduced tissue repair capacity and accelerated aging. GHK-Cu has been shown to regulate over 4,000 human genes, with a remarkable pattern: it upregulates genes associated with tissue repair and antioxidant defense while downregulating genes associated with inflammation and tissue destruction.

GHK-Cu is administered via subcutaneous injection at doses typically ranging from 1-3mg per day, or applied topically in concentrations of 1-2% for skin-specific benefits. When injected systemically, GHK-Cu promotes wound healing, stimulates collagen synthesis (types I and III), increases production of glycosaminoglycans (the building blocks of connective tissue), and enhances the activity of metalloproteinases that remodel damaged tissue. It also has potent antioxidant properties, increasing superoxide dismutase (SOD) and other endogenous antioxidant enzymes.

In the Three Root Causes framework, GHK-Cu addresses inflammation through its gene-modulating effects. By suppressing inflammatory gene expression and promoting repair gene expression, it shifts the cellular environment from a destructive inflammatory state to a constructive repair state. It pairs particularly well with BPC-157 and TB-500 in comprehensive healing protocols. Some practitioners use it as part of post-surgical recovery protocols, combining injectable GHK-Cu for systemic effects with topical application near incision sites for accelerated wound closure and reduced scarring.