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In fact, in one 6 month study, participants were given either 250 mg per day or 1,000 mg per day of reduced glutathione

They always say it

Oral supplements sold as dietary supplements operate under less stringent regulatory requirements, and quality varies significantly between manufacturers
The impact of mandatory iodine fortification and supplementation on pregnant and lactating women in Australia

[DOI] [PubMed] [Google Scholar] 16.Li Q., Yang W., Li J., Shan Z