Isomalt is a sugar alcohol made from sucrose. It delivers about half the calories of regular sugar and serves as a bulking agent and sweetener in many sugar-free products. You will find it in hard candies, baked goods, chewing gum, and chocolate.
Food manufacturers use isomalt to cut calories and help control blood sugar response since it has a low glycemic impact. It also resists fermentation by mouth bacteria, so it does not cause tooth decay. That trait makes it a common pick for tooth-friendly mints and candies.
People do not take isomalt as a separate supplement. You get it through the foods that contain it. Watch the total amount though. Eating more than 50 grams in a day often triggers gas, bloating, or a laxative effect. People with hereditary fructose intolerance usually handle it without issue, unlike fructose itself.