Dissolution, absorption and bioaccumulation in gastrointestinal tract of mercury in HgS-containing traditional medicines Cinnabar and Zuotai Overview of current researches on Tibetan medicine “Zuotai” A powder X-ray diffractometry for detection of Tibetan medicine Zuotai Study on safety of Tibetan medicine Zuotai and preliminary study on clinical safety of its compound Dangzuo Effect of Tibetan medicine Zuotai on in vivo pharmacokinetics of crocin-1 in rats