Inositol is a type of sugar alcohol that plays a crucial role in various biological processes, particularly in cell signaling and metabolism. It is often found in foods such as fruits, beans, and grains, and is also available as a dietary supplement. Inositol is sometimes used to support mental health, particularly in conditions like anxiety and depression, as well as to help manage symptoms of polycystic ovary syndrome (PCOS). Its various forms include myo-inositol and D-chiro-inositol, each having distinct physiological effects.