You do know you can get consumer reports and other critical information about other supplements on Google, right?http://www.quackwatch.org/04ConsumerEducation/QA/chitosan.html
People have done thorough studies and research on the effectiveness of these products and their claims.
At the same time, there are other products you can use to help with weight loss that's just everyday things you can eat:
More fruits such as apples & bananas,
caffeine from green tea & coffee,
decreasing intake to ridding yourself of processed foods,
healthy nutrients introduced into your body and of course,