Myo-Inositol (MYOI) is a naturally occurring sugar alcohol and the most abundant isomer of inositol found in the human body. Though historically grouped with the vitamin B complex (as Vitamin B8), it is not a true vitamin because the body can synthesize it from glucose, primarily in the kidneys. It serves as a vital structural component of cell membranes and acts as a key secondary messenger in intracellular signaling pathways. Primary Medical and Health Benefits National Institutes of Health (.gov)