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(PubMed) There is no internationally accepted safe dose or frequency for cosmetic IV glutathione

Hikari Ultra is a Japanese brand that has been around for years

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Proceedings of the National Academy of Sciences

translation to oral dietary-supplement design requires caution due to route-dependent bioavailability and brain exposure differences

In another study of schizophrenic patients (N=84), Berk et al 16 undertook a randomized, double-blind, placebo-controlled trial and found that NAC, administered at 1g twice daily for 24 weeks, was a moderately effective augmentation strategy and resulted in improvement in the study scales assessing positive and negative symptoms as well as overall functioning