Your body makes inositol on its own, and you can get it from some foods. People used to call it vitamin B8, but modern science does not classify it as a vitamin.
Many people take inositol to help maintain stable moods and support healthy insulin function. It gets attention in conversations around polycystic ovary syndrome (PCOS), where it often complements diet and exercise.
A common daily amount is 2 to 4 grams of myo-inositol, split into two separate doses. Pairing it with food can reduce stomach complaints like nausea or bloating.