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J Toxicol Environ Health B Crit Rev 10:157222 Faber S, Zinn GM, Kern Ii JC, Skip Kingston H (2009) The plasma zinc/serum copper ratio as a biomarker in children with autism spectrum disorders

When specifically used for skin regeneration or remodeling, as the new blood vessels form, blood flow is increased into damaged tissues which promotes angiogenesis and that aids in wound/skin healing.GHK-Cu creams applied to facial, eye, and thigh skin show increased skin density, thickness, collagen production, and reduced wrinkles

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Different mechanisms, no overlap, and they seem to amplify each other's effects