The present invention discloses a composition and its pharmaceutical composition for reducing body weight and body fat, and a use of said product The composition comprises epigallocatechin gallate, curcumin, and an excipient, wherein the excipient comprises at least one of glyceryl dibehenate, polyoxyethylene stearates, polysorbate 80 mixture, vitamin E polyethylene glycol succinate, glyceryl monostearate, and oleoyl polyoxyl-6 glycerides, or a combination thereof; the polysorbate 80 mixture comprises polysorbate 80 and magnesium aluminometasilicate. In animal testing where obesity is induced either prior to or during testing, use of the composition of the present invention leads to a significant reduction of body weight and body fat.