Inositol, particularly myo-inositol, is a carbocyclic sugar abundant in mammalian tissues, including the brain. It plays a role in cellular signaling and osmoregulation, responding to various hormones, neurotransmitters, and growth factors. Inositol is found in foods like fruits, beans, and grains, and offers health benefits, including support for mental health conditions like anxiety and depression, as well as potential benefits for PCOS (polycystic ovary syndrome) and metabolic health. Often used as a dietary supplement, it contributes to improved insulin function and cellular communication.