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A 2019 FDA warning letter to a compounding pharmacy cited glutathione IV formulations as 'misbranded drugs'not because the molecule itself is illegal, but because the delivery method and marketing claims crossed regulatory lines
PMID: 14988435 Townsend DM, Tew KD, Tapiero H
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This increased pigment helps block further UV penetration, but also results in a visibly darker tone, which is why many search for how to remove tanning from face effectively
Clinical trials have used doses up to 8,000 mg/day for extended periods