Thermogenic fat burners are supplements to help lose fat through the process of heat. Thermogenics often contain such ingredients as caffeine and other stimulants. These thermogenic stimulants serve to raise the raise the body temperature and the rate of metabolism, which in turn serves to lower body fat and burn more calories. Another advantage seen by those using therogenic fat burning supplements is that there is an increased feeling of energy generated, allowing the user to work out more and generally perform more physical activity, which also leads to further reduction in body fat. Those who are sensitive to stimulants should be cautious when using thermogenic supplements, as they can cause side effects such as nervousness and perhaps insomnia. However, thermogenics has been shown to reliably and efficiently burn body fat.