Stacker 2 has few ingredients with proven weight-loss properties, and Supplement Critic does not consider it an effective product. The product includes ingredients that may affect weight loss, such as green tea, but they appear in quantities too small to be effective.Continue Reading
The primary ingredient, caffeine anhydrous, has shown to be possibly effective in combination with ephedra, explains WebMD. However, as of 2004, dietary supplements containing ephedra are not legal in the United States, notes the National Center for Complementary and Integrative Health.
As of 2015, green tea has been inconsistent as a weight loss aid in clinical trials, according to WebMD. Some studies suggest that drinking green tea can affect weight loss, while other studies have shown no effect from drinking green tea or ingesting green tea extracts.Learn more about Vitamins & Supplements