yeah a couple of year ago clen and T3 were the holy grail of fat burners... I like t3, and have used clen in teh past , but it gives you the fucked up jittery/anxiety feeling. some people like it, i personally didnt.
clen simply isnt "cool" anymore, its not the trend nowadays.Now tren and HGH are very popular, and they both have fat burning capabilities.. not to say it isnt effective, it certainly is, but i think there are better options out there