Caffeine is a chemical found in tea, coffee, and other products. It helps in weight loss, and you can easily buy online. It aids in weight loss by an increase in metabolism. Get absorbed in the blood and body tissues, reaching the peak level of concentration within a few minutes of consumptions. Caffeine also triggers the release of a hormone called epinephrine, which prompts the release of adrenaline. It acts on the central nervous system and breaks down the fat cells.