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It functions as a cofactor for lysyl oxidase (the enzyme responsible for collagen cross-linking and stabilization), ceruloplasmin (a copper transport protein with antioxidant activity), and superoxide dismutase (SOD, a primary antioxidant defense enzyme)

How long does reconstituted GHK-Cu last

Recent research published in The Journal of Nutrition looks into the potential role of Vitamin B12 in improving testosterone levels among men with infertility

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PMID 16984231

The GI side effects are present but manageable