Thermogenic Fat Burner or Stimulant Free?

There are basically two type of fat burners, Thermogenic fat burner and a Stimulant free fat burner. A Thermogenic fat burner contain stimulants such as Caffeine, Guarana or Yohimbe to help speed up the metabolism. This happens by generating heat inside the body thus making your body utilize fat as energy. A Stimulant free fat burner does not contain stimulants. These type of fat burners contain ingredients like green trea extract and grape fruit extract. These type of fat burners are mainly used by people who are sensitive to stimulants such as Caffeine.