Top Secret Nutrition's Fireball L-Carnitine Liquid Igniter is designed to boost your metabolism, burn fat, create thermogenesis, and improve exercise performance. This is a product that you will feel working right away. Fireball will make you Sweat! Whether you are exercising, trying to lose weight or both, this product is a critical supplement to achieving your goals. Although stimulant free, Fireball will make you sweat, so start by taking a half serving to assess your tolerance. We suggest you take it prior to working out.