Clenbuterol or Clen is one of the most promosing weight loss supplement out there, and has been used by several celebrities. However, it's NOT a miracle pill. It strengthens your physical stamina and works both at the fat cell and the muscle tissue. It has fat burning and thermogenic properties. But, users still have to eat healthy, and do fat-burning workouts to fully make use of it. Besides, side effects like high blood pressure, insomnia, cramps, headaches need to be dealt with. We recommend legal version of clen and if you are looking for even better product, that also includes 'glucomannan' apart from fat burning and thermogenic properties of Clen, we recommend you check out Instant Knockout.