Soy isoflavones are not strictly speaking a human hormone drug. Soy isoflavones are metabolites grown in soybeans and are one of the bioflavonoids, which belong to phytoestrogens. Their main functions can prevent and treat diseases caused by the decrease of estrogen secretion, delay the aging of women, improve the symptoms of menopause, reduce osteoporosis, alleviate the increase of blood lipids, and reduce the incidence of prostate cancer and breast cancer. Soy isoflavones have been used more often before and after menopause, when women may experience symptoms due to reduced estrogen secretion in the body as a result of diminished ovarian function. By supplementing with soy isoflavones to reduce the symptoms of menopause, it can alleviate the symptoms of hot flashes, sweating, stomach chills, chest tightness, palpitations, dizziness, emotional instability, irritability, memory loss, and insomnia that occur in menopausal women.