Inositol is a carbohydrate that naturally exists in the human body. It plays a critical role in cellular function, signal transduction, cell membrane structure and neurotransmitter regulation, says Dr. Ira P. Monka, DO, a physician specializing in family medicine and the president of the American Osteopathic Association. To figure out if a supplement might be a good addition to your daily regimen, we’ve highlighted the research-backed health benefits of inos