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The rate-limiting step in extracellular GSH catabolism is controlled by -glutamyltransferases (GGTs), which cleave the -glutamyl bond in GSH to release glutamate and dipeptide cysteinylglycine
10.1002/dmrr.3319
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They dont have to pass through the enzymatic phase that might be impaired if you have the MTHFR defect or mutation
PLoS One 11 , e0156925 (2016)
Importantly, supplementation can **increase** measurable NAD+ metabolism: in a 2018 randomized, placebo-controlled crossover trial published in Nature Communications by Martens and colleagues at the University of Colorado Boulder (24 healthy middle-aged and older adults), 1,000 mg/day of the NAD+ precursor nicotinamide riboside (500 mg, twice daily) elevated NAD+ in blood cells by roughly 60% versus placebo over 6 weeks, with no serious adverse events reported
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