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. 2006 Jun;114(6):A352–A358. doi: 10.1289/ehp.114-a352

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G-force — The dominant isoflavone in soy is genistein (above), which within soy is almost always bound to a sugar molecule, producing genistin (below). Once genistin enters the digestive tract, it releases its sugar. Most of the “free” genistein is subsequently reconjugated into glucuronides or sulfates.