KLENPRIME often just called Clen, was originally create as a bronchodilator. It works in a similar way as ephedrine. Unlike ephedrine which is out of the body in a few hours, KLENPRIME lasts for days. It will not interrupt sleep and has more mild side effects. KLENPRIME greatly increases metabolic activity which increases your body temperature due to increased cellular heat. By increasing metabolic activity you increase the rate in-which fat is used for energy. While all will experience an increase in core temperature followed by an increase in metabolic activity, appetite suppression through KLENPRIME use will affect everyone differently.