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However, under certain conditions, in the presence of free (unbound) redox metals, such as iron or copper, resulting from metal dyshomeostasis, vitamin C may exhibit prooxidant properties Prooxidant properties of vitamin C in the presence of redox-active metal ions and oxygen have been confirmed predominantly under in vitro conditions, occurrence under in vivo conditions has not been convincingly documented (Halliwell 1996)

At high levels, it also inhibits the activity of 3-hydroxysteroid dehydrogenases (3-HSD) and 17-hydroxysteroid dehydrogenases (17-HSD) specific to Leydig cell function by increasing oxidative stress in Leydig cells

Bhabak KP, Mugesh G (2010) Functional mimics of glutathione peroxidase: bioinspired synthetic antioxidants