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Many commonly studied ingredients such as vitamin C, glutathione precursors, niacinamide, and plant polyphenols have established safety data when taken within recommended ranges

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doi: 10.1158/0008-5472.Can-09-1947 32 GuertinDASabatiniDM

Free Radic Biol Med 45, 537546, 10.1016/j.freeradbiomed.2008.05.011 (2008)

Preclinical evaluation of azathioprine plus buthionine sulfoximine in the treatment of human hepatocarcinoma and colon carcinoma
