Do you experience muscle cramps when doing cardio? Muscle cramps and shakes are my indicator on whether or not the clen is legit. Never had problems with sleep though. The clen i tried was oxyflux from mexico and it was pretty weak.
I got some clen for the first time a little while ago, Sciroxx labs 40mcg, and took 80mcg. I certainly noticed all of these side effects a few hours later and still later that day:
Thumping heart - sit quietly somewhere and hold your breath for 5 seconds, I can feel my heart kind of "boom, boom".
Shakes - I was at work having lunch with other people, and noticed I was almost shaking my food off my fork before it got to my mouth. This didn't half increase the paranoia, thinking everyone will think I'm on crack. Next day I had an even worse lunch with rice, and had to go eat at my desk.
Cramps when swimming - almost had to stop halfway down the lane.
I got taurine and electrolyte plus tablets (potassium etc), and dropped to 40mcg a day after a day off. I like it. :-) Sides are a bit less now but still noticeable. Might increase dose a bit before the break.
I'm thinking I need to up my keto during the third week because my clen doesn't seem to be working anymore. My body temp isn't up or anything and I'm up to 180mcg. I get mild shakes but nothing bad at all. I know this seems high but I was told to just not go over 200mcg. Its EP clen and seemed to work good before just think my receptors must be a little downgraded