:::This stuff should probably not be used by beginners.::::
Haven't seen THIS in a long time
Used to give crazy results, but the bruises/welts were a b1tch
I would just try out Clen first. If you have a reputable source and the product seems "legit", then I would just do a 2-week on/off cycle or run Keto throughout. I wouldn't run ECA along with Clen though. Since E and Clen are both pretty harsh on the adrenal glands, you really do not want to burn them out. Up the water and have Taurine on hand for the cramps.
Don't quote me, as I don't have my Pharm book in front of me. If I remember correctly, it supposedly "burns-up" or severly depletes the stored potassium and taurine levels in your liver. Also, dehydration and electrolyte imbalances would cause cramping.
Clenbuterol has an extremely long half life, compared to albuterol. This is why albuterol is used as a "rescue" drug for asthmatics and not for long term prevention.
Yes, it will also cause increased H/R, B/P, Headaches, etc....if you have too much in your system or you react adversely to it. Make sure to have plenty of water and the proper electrolytes to replace what you will lose. Granted sometimes it's ok to have these S/E, however, if they are excessive or way out of what you usually experience, then it's time to stop taking it or start titrating the dose down.
The thing with T3, is that people WANT to feel something. The main thing you should do is monitor your temperature. T3 is a drug that takes a long time to start working. It's not like it hits you right then and there. I see people taking one to two days @ 50mcg, getting upset that they don't get an amphetamine rush, and bump it up to 100mcg! (note: this is if you have a legit product and not some bunk piece of shit)
I know you were asking about Clen, but it and T3 are usually paired together for "research".