isoflavone

…the soy foods that contain isoflavones, estrogen-like compounds that are thought to be responsible for these beneficial cardiovascular effects.

…to midlife supplementation with soy isoflavones (estrogen-like compounds) in Western women. Isoflavones appear to compete with estrogen (e.g., in premenopausal women), and thereby blunt its effect; when in a low-estrogen environment (e.g., in postmenopausal women) they exert weak estrogenic effects. There is as yet no consistent evidence that soy in…