Hoodia supplements sold in the U.S. don't have enough Hoodia extract or powder to do anyone any good.
You have to have a permit to harvest hoodia and so it's very difficult to 1) obtain and 2) produce.
The is a major pharmacutical company harvesting and experimenting with it right now and they will be trying t get their Hoodia product okayed by the FDA soon. In fact, they are running trials now and have applied to manufacture and trademark/copyright their formula.
However, save your money until anything claiming to have quantities of Hoodia in it is FDA approved.
Hoodia does have amazingly significant appetitite suppressant qualities when eaten raw from the plant. And it does not give you the jitters as many diet/weight loss pills and items do. You just simply don't feel hungry. But in consuming it in pill, capsule, or any other form, you're not getting enough to make it worth a tinker's dam.
Soon, it may be one of the magic pills to losing weight though. Patience is the key!
I have to disagree with anyone saying that the Hoodia available on the market right now will not help to curb your appetite. I have been taking Hoodia 24 by Vita Logic for two weeks now. My appetite has DRASTICALLY reduced and I am not hungry...even at mealtime. I have lost about 8 pounds just by cutting down on eating. Exercise will begin nest week. I am a firm believer in any products offered by Vita Logic. They do a lot of research on any products they put their name on. Daily, I take their B-12 in addition to the Hoodia 24.