Inositol is a naturally occurring nutrient that is usually classified as a carbocyclic polyol. The most common form of inositol is sometimes referred to as myo-inositol. In the human body, inositol plays a major role in preventing the collection of fats in the liver, as well as promoting healthy hair growth. The presence of the nutrient also aids in efficient processing of nutrients into the conversion of energy, which in turn helps the body to maintain a healthy metabolism. Inositol also can be considered brain food, as the nutrient is necessary to properly nourish the brain.