Xylitol is an all-natural sugar alternative that tastes and looks like sugar but that is where the similarities end. Our bodies produce Xylitol daily during normal metabolism. Xylitol is one of a group of sugar substitutes known as polyols. Others in the same group include sorbitol and maltitol, which have 6 carbon structures (and can be metabolised by harmful bacteria). However, xylitol has a unique 5 carbon structure which is metabolised only by friendly bacteria. Xylitol is a sweetener that occurs naturally. It can be found in berries and other fruits, some vegetables and in the woody fibres of birch tree bark and corn cobs. It is even produced by the human body as a part of normal metabolism.