TrimSpa
It doesn't swell up - not sure where you heard that.
What you should probably be careful for is the amount of caffiene these pills have. Most of them are just Green Tea Extract and Caffiene. You still need to diet and exercise with TrimSpa. They also have natural herbal "mood elevators" which make people feel good when taking them. I have not heard anyone have long term success with TrimSpa at all.
Good luck!