I've not seen any benefit to using Clen (but maybe others respond differently to it). It gives me the sweats and shakes, but it makes me look flat, does not cause any difference in weight, does not appear to change my body (aside from going flat), and causes me to tire out faster during work outs, except unless you abstain from using it for like 3 weeks, then you get an energy rush from using it, kind of like an epinephrine shot. It's short lived however and has its consequence. In my opinion, this is an occasion where rats and humans differ. They respond to Beta2/Beta3 stimulation much different than humans.