GHK-Cu is a naturally occurring copper-binding peptide (glycyl-L-histidyl-L-lysine) found in human plasma, saliva, and wound fluid. It is widely recognized for its regenerative and anti-aging properties, including promoting wound healing, stimulating collagen production, reducing inflammation, and exerting antioxidant effects. In skincare, GHK-Cu is commonly used to improve skin firmness, elasticity, and overall appearance. Additionally, research suggests it may play a role in hair growth stimulation and tissue repair.