Glucomannan has almost no calories, but is very high in fibre. It absorbs water in the stomach. When in contact with water, glucomannan expands and can absorb up to 50 times its weight. That's why the recommended dosage of glucomannan is lower compared to other fibre supplements. Vitamin B6 and B12 contribute to normal energy-yielding metabolism and the reduction of tiredness and fatigue encouraging the body to keep active. Not intended for use by persons under the age of 18.