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Because they work upstream of growth hormone, the body's own feedback systems remain active, and supraphysiologic levels cannot be produced

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Apply 35 drops of copper peptide serum to clean, damp skin, wait 12 minutes for absorption, then follow with moisturizer

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The copper(II) ion in GHK-Cu is a cofactor for lysyl oxidase (LOX), the enzyme responsible for collagen and elastin cross-linking in blood vessel walls

To understand why this is, see the figure below: Vitamin B12 and folate are involved in a biochemical pathway called the methylation cycle