http://www.mskcc.org/mskcc/html/69263.cfmClinical Summary
Indole-3-Carbinol (I3C) is a specific compound found in cruciferous vegetables including broccoli, cabbage and cauliflower. Because diets high in these vegetables retard cancer growth in animals, I3C is thought to be a good candidate for cancer prevention (1). Data from clinical trials show that I3C is effective in treatment of precancerous cervical dysplasia (2) and vulvar intraepithelial neoplasia (3). In premenopausal women, a supplement containing I3C and 7-hydroxymatairesinol significantly increased the urinary 2:16-hydroxyestrone ratio, a known biomarker for the reduction of breast cancer risk (4). I3C also stimulates detoxification enzymes in the gut and liver (5). Several in vitro studies demonstrate that it can cause cell cycle arrest (6) (7) and apoptosis (8) (9) (10) (11) (12) in cancer cell lines. I3C is generally well tolerated when taken orally. I3C may promote tumor growth in animals that have been exposed to carcinogens (13). Because it may induce cytochrome P450 enzymes (14), I3C may interact with several medications.
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Food Sources
Broccoli, brussel sprouts, cabbage, cauliflower, collards, kale, kohlrabi, mustard greens, rapeseed, rutabaga, turnip