Every person is unique and different. There are some things and medicines that work for some people but not for others. That's why it is very important to be picky and cautious on what to buy or use especially when it can damage or ruin your health permanently.
If you are planning to try using fat burner, always ask your doctor and be informative. Search and read online reviews to get an idea which one is best for you. It's better to put safety first before it gets out of control.