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These enzymes catalyse the reduction of harmful peroxides, including hydrogen peroxide and lipid hydroperoxides, thereby preventing oxidative stressinduced damage to lipids, proteins, and nucleic acids

(2007) has recently shown no effect of organic selenium on systemic GSH-Px, although the GSH-Px activity did increase in gastrocnemius muscle

Physiol Behav (2011) 104:208

Hall, James P

Sleep and Oxidative Stress A lack of quality sleep is one of the quickest ways to deplete your bodys natural antioxidant stores

So Glutathione Therapy administration can certainly increase nervous system levels of Glutathione hence the use of Glutathione Therapy in neurological disorders