Here are a couple of things that I found when googling.... The GNC one is really the only one that I'm familiar with, although the other one works the same way, I believe

Chitosan - http://www.gnc.com/product/index.jsp...entPage=family

Propelene - http://www.fitness-events.com/propolene-diet-pills.htm

If you decide to do it, just make sure you take with lots of water. Otherwise they can get stuck in your esophagus...where they will expand and suffocate you.

IK is probably right about whole foods working better...at least they're safer. There are several new things that are synthetics that are supposed to be coming out soonish. I think that there already some synthetic things that work similarly...in which case they might work better than whole foods. I've only sold them to one woman who liked them and came back to buy more. But it's hard to say because about 95% of the feedback that I get from people that shop at GNC is placebo effect IMO.