There are as yet no firm federal guidelines on ephedra. If it were a drug, the manufacturer would have to demonstrate safety and efficacy. But since it's technically an herbal remedy, no such restrictions apply. Based upon the best calculations we can make, the dose in the diet pills appears to exceed the maximum dose the FDA proposes as safe. No one knows whether Herbal Fen-Phen works or what its side effects might be.
Vague testimonials back it up, plus advertising.
It has never been tested, but scientific research is now underway. We urge you to wait for the results.