Sugar alcohols are commonly found in sugar-free gum and sugar-free baked goods and sugar replacements. Xylitol is one of the most popular forms. Others include: erythritol, isomalt, lactitol, maltitol, mannitol, sorbitol. While often marketed as natural, these sweeteners undergo intense processing and are often derived from GMO ingredients like corn. Some of these products are also linked to allergic reactions, headaches, SIBO symptoms, rashes, gas and bloated.