Glycitein is a minor isoflavone in soy. Soy contains mostly genistein and daidzein, so glycitein appears in far smaller amounts. Researchers have not studied it on its own in humans; nearly all the evidence comes from trials that mix all three soy isoflavones together.
A glycitein supplement usually comes inside a full soy isoflavone complex. People take these blends to support hormonal balance during menopause, or to promote heart and bone health. The effects are tied to the total isoflavone profile, not to glycitein by itself. The dose on the label refers to the whole isoflavone mix, not a standard glycitein amount.
Because solo glycitein data are thin, follow the same precautions you would for any soy isoflavone product.