CHINESE HERBAL MEDICINE - Niuhuang Jiedu Pian Product manufactured in China (Cow yellow detoxification tablet ), Intended to treat mouth ulcers, relieve tooth aches, reduce fever, and release toxins , product import document indicated that As in the form of realgar (As 4 S 4 ) ICP-MS showed 6.85% As (note low value here versus XRF may be due to inability of acid digestion procedures to dissolve realgar) Handheld XRF showed 11.7% As in product (Compton Normalization mode, empirical calibration with As standards, diluted sample into range of standards) Recommended max dose of 9 tablets per day is equivalent to consumption of 0.173 g of As (minimum lethal dose ~0.130 g*) *http://www.atsdr.cdc.gov/toxprofiles/tp2.pdf, p.