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Doctors often suggest this for adults with B12 deficiency or those at risk

They are regulated by the Controlled Substances Act set up by the DEA

doi:10.1242/JCS.113.24.4435 11

The primary mechanism involves copper delivery to dermal tissues where this essential cofactor supports numerous enzymatic processes including collagen synthesis, elastin production, glycosaminoglycan formation, and antioxidant enzyme activation

Foods that are high in vitamin B12 include meat, fish, eggs, and dairy

View Source FEBS LETT GHK-Cu Stimulates Collagen Synthesis in Fibroblasts 1988 Maquart FX, Pickart L, Laurent M, Gillery P, Monboisse JC, Borel JP