Inositol – Uses, Benefits, Sources and Dosage Inositol is one of B complex vitamin which is sometimes also called as the vitamin B8. It is required in small amount for healthy functioning of body. Inositol is present in all tissues of body but highest concentrations are found in heart, brain and lens of the eye. It is water soluble so body is not able to store it. So it is required daily in diet in order to avoid its depletion