Synephrine and ephedrine act differently on alpha and beta adrenergic receptors. Ephedrine is a direct and indirect beta agonist with relatively slight Ripped Muscle X activation of alpha receptors. Instead, synephrine acts as a direct alpha receptor agonist with a relatively smooth beta receptor activation by releasing epinephrine and norepinephrine. This is very important because when it comes to remove fat activation of beta receptors is truly the key, especially beta 3 receptor. DO NOT TRY Ripped Muscle X -SHOCKING FIRST READ IT | http://www.supplemen...ipped-muscle-x/