Thermogenic supplements are designed to increase the body’s metabolism and burn more calories. While these products can be beneficial for weight loss, they may also have some side effects. These include increased heart rate, jitteriness, insomnia, headaches, nausea or stomach upset, anxiety and restlessness. Additionally, long-term use of thermogenics has been linked to high blood pressure and an irregular heartbeat. It is important to speak with a healthcare professional before taking any thermogenic supplement in order to ensure safety and avoid potential risks associated with their use.