I started taking Alli because I had recently put on some weight. The greatest thing I can say about this product is that its the only diet supplement I've found that doesn't use stimulants. Ive tried other pills that made me jittery or kept me up all night, so I needed something that was caffeine and stimulant free. This does have side effects, but I think that Alli may have gotten a bad rap as far as that goes. In my experience I've found that if I don't eat large amounts of fat I don't get any side effects at all. If I screw up on my diet and eat a lot of crap, then I do. I think...review »