Soy milk is not bad for you, and contains several ingredients that are beneficial to health, including protein, fiber and isoflavones. Soy is also high in protein and contains all the essential amino acids required for good health.
Soy protein is found in soy milk, and it may decrease the risk of breast cancer in women and prostate cancer in men. Researchers are investigating soy protein for its effects on heart disease, arthritis and menopausal symptoms, as of 2015. Soy formula for babies has been used to treat diarrhea in infants, and most babies can be given soy formula as an alternative to cow's milk.