I have read that hoodia does work, but only the real thing. a lot of companies selling the stuff don't contain tracable amounts of hoodia.

I read an article a few months ago that said if all the companies out there claiming to sell hoodia were actually selling it the cactus would be extinct by now.

Use caution when you use herbal supplements, because they aren't regulated. make sure you buy it from someone reputable. I know the real stuff is really expensive, so if it is cheap its probably not real.