Radix Bupleuri. Part used: Root. Known as Thorowax Root. Entering meridians: Gallbladder, Liver, Pericardium and San Jiao. Origin: Hebei, Henan and Liaoning. Chai Hu Cu is a PaoZhi processed herb so can be more effective at strengthening the function of soothing Liver Qi and pain relief. All Phoenix Medicial dry herb and concentrated herbal granules are grown without sulphur, pesticides or herbicides and are grown in the place of origin.