Inositol (myo-Inositol) or cyclohexane-1,2,3,4,5,6-hexol is a chemical compound, a six-fold alcohol (polyol) of cyclohexane. It exists in nine possible stereoisomers, of which the most prominent form, widely occurring in nature, is cis-1,2,3,5-trans-4,6-cyclohexanehexol, or myo-inositol.

Inositol is a carbohydrate, though not a classical sugar. Its taste has been assayed at half the sweetness of table sugar (sucrose).

Inositol is a vitamin-like substance. It is found in many plants and animals. It is part of the B-Complex family. Myo-Inositol plays an important role as the structural basis for a number of secondary messengers in eukaryotic cells, the various inositol phosphates. Inositol plays an important role in promoting cellular membrane health.

When combined with Choline, Inositol can help produce lecithin in your body. Lecithin is fundamental in breaking down fats in your body and this means that it can prevent fat build ups in the cell walls of your heart, arteries and brain by breaking down the fatty deposits. This can lead to the potential outcome of lowering fat in your arteries, and thus lowering cholesterol.

Inositol may balance certain chemicals in the body. Inositol is said to participate in the action of serotonin production in the brain and nerve systems that responds well to mood stabilizers.

Inositol is also used to promote strong, healthy hair.