After a few days on clen, I started to notice that its effects were hardly noticeable and I wasn't experiencing the thermogenic benefits. Possibly it was a perception issue, but I ended up increasing dosage quite high >150mcg and it still didn't have a noticable effect. Then I decided to give it a break and now after a couple of days of being back on (at 100mcg ED), I'm still not noticing anything other then perhaps wasting clen. I had been under the impression that it could be run for a few weeks before it lost its edge, but from first-hand experience, this really doesn't seem to be the case. OTOH, I've had some amazing workouts... Anybody else experience the same thing? Advice?