Glucomannan An Excellent Addition To A Sensible Weight Loss Program Glucomannan (amorphophallus konjac) is a 100% dietary fiber source obtained from the root of the konjac plant, which contains no calories. It is an excellent addition to a sensible weight loss program. Nature's Way Glucomannan is specially grown and prepared in Japan according to our exacting specifications. Nature's Way herbs are a natural addition to a healthy and balanced lifestyle, a way of living that nurtures and supports the needs of the body, mind and soul. Herbs can be a gentle, yet powerful way to nourish and strengthen the body and assist it in its own healing processes. For best effects and a sense of holistic health, incorporate nature's way herbs into an active lifestyle which exercises and enhances the mind and the body and helps to promote a feeling of inner well-being.