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GHK-Cu May Prevent Oxidative Stress in Skin by Regulating Copper and Modifying Expression of Numerous Antioxidant Genes. Cosmetics

American Academy of Clinical Toxicology (February 2013), "Five Things Physicians and Patients Should Question", Choosing Wisely: an initiative of the ABIM Foundation , American College of Medical Toxicology and American Academy of Clinical Toxicology, retrieved 5 December 2013 David Rakel, Integrative Medicine 5th edition, Elsevier, 2023

Lipid peroxidation products can diffuse across membranes, allowing the reactive aldehyde to covalently modify proteins localized throughout the cell and relatively far away from the initial site of reactive oxygen species (ROS) formation

Food and Drug Administration Primary regulatory Mar 31, 2026 accessed Jun 30, 2026 FDA warning letter discussing peptide products marketed online and the limits of research-use-only positioning