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When used for skin whitening, glutathione is administered directly into the bloodstream via an IV infusion

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To the reporters of the investigation, McGuire was more direct: the compound should not be used by humans. Eric Topol, director of the Scripps Research Translational Institute, was even more straightforward than McGuire: None of [the experimental compounds] are proven. He called it extraordinary that gray market human use was occurring in the absence of adequate clinical trials