Soy milk contains estrogen. Soy milk contains a phytoestrogen called soya glucosinolone, which is not found in milk, and can regulate the function of the female endocrine system. Soy milk is an important source of body protein in addition to animal proteins such as fish, eggs and milk. Soy protein is a high quality protein that can be absorbed and utilized by the body. Protein can synthesize important enzymes, hormones, antibodies and other biologically active substances in the body, thus improving the immunity of the body. Soy milk can also improve the state of blood vessels and help alleviate the symptoms of hypertension, hyperlipidemia, hyperglycemia and other three high symptoms. Drinking soy milk regularly in daily life can also improve the function of the human brain, because the calcium and magnesium contained in soy milk and other trace elements can significantly reduce the level of blood lipids in the cerebral vessels and improve cerebral blood flow. The lecithin contained in soy milk can also reduce the death of brain cells and improve brain function. Women often drink soy milk is very beneficial to the body, but also can slow down the aging process. Women who drink soy milk regularly can regulate the level of estrogen and progesterone in the body, which can effectively prevent breast cancer and ovarian cancer.