Soy isoflavones are phytochemicals found in soybeans and are known as natural estrogens because of their estrogen-regulating effects in the body, and can also be used as medications. In general, eating soy products containing soy isoflavones in moderation, or taking soy isoflavones in doses as prescribed by a doctor, will cause relatively few or minimal side effects and harm to the body. However, if the abuse of soy isoflavones drug products, may cause significant side effects and harm to the human body.1. Side effects: If moderate intake of soy, tofu, dried beans, bean curd and other foods containing soy isoflavones, generally will not cause side effects to the body due to the biological activity of soy isoflavones. However, long-term and large amounts of drugs containing soy isoflavones may increase the risk of hormone level imbalance in the body, resulting in endocrine disorders; 2. Hazards: Drugs containing soy isoflavones are often used to prevent and treat diseases such as osteoporosis, diabetes, Alzheimer’s disease, uterine fibroids, breast cancer, lung cancer, or as drugs to protect important organs such as the cardiovascular and liver. If patients do not follow medical advice on medication and increase or decrease the dosage at will, the drug activity of soy isoflavones will be affected, which is likely to affect the prognosis of the disease and even cause adverse consequences such as aggravation or induction of disease. The random use of soy isoflavones during pregnancy or lactation may cause the drug to enter the fetus through the placenta or breast milk, affecting fetal development. Soy isoflavones are extracts of soybeans, which need to be purified and formulated through complex processes before they can play a therapeutic role, and they need to follow medical advice and have their hormone levels checked regularly during use. The content of soy isoflavones in ordinary soy products is very small, so it does not have a therapeutic effect, and a small amount of consumption does not have much effect, and is one of the main sources of soy isoflavones for normal people.