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A meta-analysis of studies using NAC to increase athletic performance found that there were more side effects (none severe) at 20g/day.[ref] High doses of NAC are used in hospitals by IV for reversing acetaminophen toxicity

Anti Aging And Skin Health Antiaging is where many people first hear about NAD+ vs Glutathione, and once again the two molecules work on different timelines

doi: 10.1016/s1534-5807(03)00100-x 68 ScullCMTabasI

Comparable age groupings are proposed in the Dietary Guidelines for Americans, though the recommended intake levels differ, beginning at 0.5 g in infancy, increasing to 2.4 g for adults, and rising modestly during pregnancy and lactation (2.6 g and 2.8 g, respectively

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