Tight Xtreme Stimulates Alpha and Beta Adrenergic receptors to mimic the effects of Epinephrine (more commonly knows as adrenaline). Tight Xtreme causes the indirect release of Norephinephrine and Dopamine to provide greater and extended bursts of energy along with mood elevating properties without the crash afterwards.* Tight Xtreme works to curb appetite to prevent caloric overeating.