A series of studies have been carried out, which include bioprospection of medicinal plants that have anti-obesity or slimming efficacy, test the efficacy of the single extract, and their combined extract formulas. Some Indonesian medicinal plants such as Dutch teak leaves, Bangle, Orange Jasmine, Tamarind leaves, Gelugur acid, Kencur rhizome, Galangal, and Kunci Pepet can be used as anti-obesity by determining their inhibitory power to the pancreatic lipase enzyme in vitro.