To everyone who is considering trying this you have to know that first of all, Yes it does work and secondly there are side effects. The first couple of times you take Zantrex you are going to be sick. So far I have had four people start taking Zantrex because they noticed my weight loss. But they all have really bad nausea, and some cramps for the first week. I suggest taking only 1 pill for the first week you take it so your body can get used to it first.