However, it has been found to be ineffective and toxic; its promotion has been described as "the slickest, most sophisticated, and certainly the most remunerative cancer quack promotion in medical history."[53] Andrographis paniculata – a herb used in Ayurvedic medicine, and promoted as a dietary supplement for cancer prevention and cure. The Memorial Sloan-Kettering Cancer Center has stated that there is no evidence that it helps prevent or cure cancer.[54] Aveloz (also called firestick plant, pencil tree or Euphorbia tirucalli) – a succulent shrub native to parts of Africa and South America.