Caffeine increases alertness and energy by blocking the effects of adenosine (a brain chemical that makes your feel tried) and triggering the release of adrenaline. Chlorogenic Acid in Green Coffee Extract increases the levels of adiponectin hormone which boosts metabolism and fat-burning. L-Carnitine L-Tartrate is a form of L-Carnitine that is rapidly absorbed by your body. L-Carnitine helps your body convert fat into energy. L-Theanine modulates the stimulatory effects of caffeine by crossing the blood-brain barrier to neutralise the excitatory effects of neurotransmitters serotonin and dopamine. It also decreases levels of the hormone corticosterone and boosts alpha brain wave activity to reduce anxiety and increase creativity. Theobromine in Cocoa Extract increases energy by blocking adenosine receptors to reduce feelings of tiredness. It also blocks phosphodiesterase enzymes and increases the activity of a messenger called cAMP to widen blood vessels and increase stimulation. Cayenne Pepper boosts metabolism and fat burning. And Piperine boosts the absorption of nutrients.