dietary supplement dietary supplement, fibre Fibre supplements (or fiber supplements) are considered to be a form of a subgroup of functional dietary fibre, and in the United States are defined by the Institute of Medicine (IOM). According to the IOM, functional fibre "consists of isolated, non-digestible carbohydrates that have beneficial physiological effects in humans". Fibre supplements are widely available, and can be found in forms such as powders, tablets and capsules. Consumption of fibre supplements may be for: improving dietary intake, lowering blood cholesterol, alleviating irritable bowel syndrome, reducing the risk of colon cancer, and increasing feelings of satiety. [http://en.wikipedia.org/wiki/Fibre_supplements] fibre fibre supplement fiber fiber supplement