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Enzymes like NADPH oxidases, xanthine oxidases, cytochrome P450 and other oxidases also produce ROS

A small clinical trial showed a 2 to 10-fold increase in GH levels lasting up to 6 days after a single injection (Teichman et al., J Clin Endocrinol Metab 2006)

Food Chem Toxicol 33:10611080 [DOI] [PubMed] [Google Scholar] Foti MC (2015) Use and abuse of the DPPH radical

ROS induces several cellular effects, including cell cycle progression, apoptosis, DNA damage, senescence, and neurodegeneration

46 Diminished levels of GSH are characteristic of chronic diseases, collectively the leading cause of mortality in the world