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That molecule, now known as GHK-Cu, has since been shown to influence the expression of more than 4,000 human genes, touching pathways involved in tissue repair, inflammation, antioxidant defense, nerve regeneration, and cancer suppression

Oxygen free radicals, the primary byproducts of oxidative stress, are highly reactive and can lead to lipid peroxidation, protein oxidation, and DNA damage [100, 101]

Factors affecting injection duration include the underlying cause of deficiency, pregnancy, inflammatory conditions, and medications such as metformin and proton pump inhibitors

In that case, supplementation or dietary modification may be helpful