Stacker's success began in the United States with the introduction of Stacker 2. At that time this was a unique product that enabled weight management without unpleasant side effects, such as a nervous feeling. In the meantime much has changed and more powerful versions of Stacker have been developed. Even so, this Stacker 2 is still just as popular as ever and has been one of the most successful formulas in the United States and Europe for many years. Added Caffeine will result in higher feelings of energy, just like Cola Nut, Yerba Mate and Gymnema. The combination of energy increasing ingredients and B vitamins are perfect for everyone who need just a little help from a herbal supplement to loose weight or to get some energy.