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You can also get it from supplements, but most of it is broken down by enzymes in the gut into amino acids, such that only long-term use of large amounts (500 mg or more) appears to modestly raise glutathione levels
Shi H, Yang S, Lin N, et al
Content that may indicate specific health claims for ingredients or delivery systems has not been evaluated by the FDA
Theres no established upper limit for B12 intake
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