Glucomannan is a water-soluble polysaccharie that is considered a dietary fiber. Glucomannan is a food additive used as an emulsifier and thickener. Products containing glucomanan, marketed under a variety of brand names, are also sold as nutritional supplements for constipation, obesity, high cholesterol, acne vulgaris and type 2 diabetes. Though there is some clinical support for potential health benefits, the U.S. Food and Drug Administration (FDA) has not approved any product containing glucomannan for the treatment of these medical conditions. Several companies selling products containing glucomanna have been disciplined by the U.S. Federal Trade Commission (FTC) for misleading or exaggerated claims pertaining to the health benefits of glucomannan supplements.