For more than 10 years, Don Valley pharmaceuticals has been helping fight obesity with its innovative dietary supplement, Propol. The company started packing Propol after reviewing  studies which showed that one of the reasons the prevalence of obesity is lowest in Japanese is due to consumption of a natural substance found in local plant, Konjac, an over the counter product. Propol gives a feeling of satiety, helps lower blood pressure, cholesterol and control blood sugar.