Instruct: Classify Amazon reviews into positive or negative sentiment
Query: This does not work

I have been taking chitosan for 4 weeks and lost three pounds and gained three pounds. In the beginning I had very bad diarrhea 3-5 times a day for the first week and I believed this was clearing my system of fat. But in fact I was just becoming dehydrated because my body wasn't used to the chitosan. I lost three pounds the first week and was so excited. I took two pills with every meal and ate low in fat foods that were healthy staying under 1500 calories a day. Then during the second week I gained the three pounds back though I kept up my diet and still took the pills. In the third and fourth week my weight didn't change anymore. The only thing this product is good for is a laxative. It might work for others but it did not work for me