Plant foods don't have vitamin B12 unless they're fortified
Am J Gastroenterol 112(2):212239 Malfertheiner P, Megraud F, OMorain CA, Atherton J, Axon AT, Bazzoli F, Helicobacter E, study group
It also serves as a substrate for various antioxidant enzymes, including glutathione peroxidase and glutathione reductase, which further amplify its protective effects
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GSH is the bodys first line of defense against oxidative stress imposed from the outside world including but not limited to pollution, cigarette smoke, bacteria and viruses, amongst many other invaders
To protect your glutathione levels and overall health, consider quitting smoking or avoiding exposure to second-hand smoke