Mater 30 (13), 1908865
Vitamin B12 is stored in the liver, so if you stop consuming foods that contain this vitaminfor example, if you adopt a vegan or vegetarian lifestyleit can actually take between 3 and 5 years before the body uses up its supply of vitamin B12
10.1111/ejn.14713 Eur
Finally, administration of glutathione precursors such as whey protein, vitamin C, and glutamine, which are often recommended to boost glutathione levels in the body, typically does not raise the level of glutathione by a significant amount, require high doses to be effective, and cost significantly more than an equivalent amount of glutathione
User 15 cited a general dosing range of 2.5 to 3.75mcg per kilogram of body weight twice daily, which, at higher body weights, still produces doses within the standard 250 to 500mcg range being used across the dataset
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