Bioavailability, Pharmacokinetics, and Tissue Distribution of the Oxypregnane Steroidal Glycoside P57AS3 (P57) from Hoodia gordonii in Mouse Model - Madgula, Vamsi L. M.; Ashfaq, Mohammad K.; Wang, Yan-Hong; Avula, Bharathi; Khan, Ikhlas A.; Walker, Larry A.; Khan, Shabana I. (Planta Medica, 2010)