Using Hoodia?

I've just finished my multi-vitamins, and was at the pharmacy to get more. I was browsing the shelves on the various supplements available, and something caught my eye. The word hoodia rang a bell. I read about hoodia being an effective weight loss supplement, by suppressing one's appetite. Even with my frequent trips to the gym, my weight is still unchanged to date. Thus, I am actually quite tempted to try out hoodia. But there are so many brands in the market. Which would be the best? With maximum efficiency with minimum side-effects and costs?