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In NOX4 knockout mice, cysteine helped protect the liver from acetaminophen injury.[ref] Vitamin B6, pyroxidine: Vitamin B6 is an essential cofactor in the transulfuration pathway with the CBS enzyme, which converts homocysteine to cysteine (and then to glutathione)

In a small, randomized, double-blind placebo-controlled crossover trial assessing the effectiveness of lisdexamfetamine for attentional deficits associated with moderate-to-severe TBI, improvements in measures of sustained attention, working memory, and executive functioning were identified 8

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Glutathione - 55mg per tablet / 330mg per serving: Glutathione competitively inhibits melanin synthesis in the reaction of tyrosinase and L-DOPA by interrupting L-DOPA's ability to bind to tyrosinase during melanin synthesis