What is the hoodia plant, free ebook. Learn about the Hoodia Gordonii cactus, the plant with the new wonder ingredient that curbs one's appetite and helps one to slim. The discovery of the active ingredient in the Hoodia gordonii plant is proven with clinical research to suppress one's appetite by up to 2000 calories a day. This amazing and all natural and organic ingredient is the result of 30 years of research by the CSIR (Council for Scientific and Industrial Research) in South Africa.