Is your Appetite out of Control? TRY PHENTERTHIN. When you're ready to lose the weight for good! Like Phentermine and other diet drugs that have gone before it, Phenterthin is potent. In addition to increase your metabolism, it also works as an appetite suppressant -- so you'll end up eating less and burning more fat! Clinical trails have shown Phenterthin to increase metabolic rate by over 75 percent, and some users have seen as much as a 19 percent drop in total body fat while using Phenterthin