HealthWise myo-Inositol is a 100% pure pharmaceutical grade microcrystalline powder. Inositol is a fundamental ingredient of cell membranes and is necessary for proper function of nerves, brain and muscles in the body. Myo-Inositol is a naturally occurring substance produced in the human body that belongs to the vitamin B complex group. Myo-Inositol is one of nine different types of Inositol and can be found naturally in many foods such as fruits, nuts and beans. It is a precursor to a number of "signalling molecules" that essentially tell cells how to behave.