Thermogenic fat burners are supplements that help lose fat through heat. Thermogenics often contain ingredients such as caffeine and other stimulants. These thermogenic stimulants serve to raise the body’s core temperature and metabolism, which in turn serves to lower body fat and burn more calories. Another benefit seen by those who use thermogenic fat burning supplements is that it generates an increased feeling of energy, allowing the user to exercise more and generally perform more physical activity, which also leads to a 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, thermogenic drugs have been shown to burn body fat reliably and effectively.