Soy is a protein alternative that is also used as a substitute for dairy by those who are lactose intolerant. It can also be used as a formula for babies allergic to other powdered formulas. While soy contains estrogen and processed soy can cause side effects like stopping menstruation or mood imbalances in females and increased estrogen production in males, other countries consume soy in its organic form for health benefits. The document provides information on soy's chemical structure, hazards, allowed amounts, and alternatives.