The first type contains stimulants that supposedly cause us to burn fat faster, though scientific studies have not yet proven this claim. Since they are stimulants, they may also work as appetite suppressants, these teas also carry the risks of other appetite suppressants, including nervousness, headaches and sleeplessness. Examples of stimulant ingredients include ephedra, ephedrine, ma huang, kola nut, and guarana. By causing excess water loss, they can also lower levels of important minerals like potassium, which can cause serious health problems. Some of the most common of these stimulant laxatives are senna, locust plant, angustofolia, cassia angustofolia, cascara and buckthorn.
Experts warn that the use of such products is hazardous.