Inositol is a vitamin-like compound that was previously known as vitamin B8 until it was discovered that the human body can produce it from glucose. Though this means that inositol is no longer considered a vitamin, it is still vital for important functions in the body.
Inositol exists in the form of 9 different isomers. All inositol compounds differ only in the spatial arrangement of their atoms. The two best-known inositol forms are myo-inositol and D-chiro-inositol.