Stacker 2

Stacker 2

Stacker 2 is unique on this list in that it is marketed solely as a metabolism booster. The original Stacker 2 was based on the common stack known to many athletes and body builders of Aspirin (white willow bark), ephedrine (ma huang), and caffeine. These three components together create thermogenesis in the body, which speeds up metabolism and therefore burns calories at a higher rate. Since the ban of ephedra Stacker 2 has added other stimulant ingredients as substitutes.