Yeah, I have taken 2 cycles of clen. I have seen some awesome results. I did however get the shakes really bad, (first cycle only), I get muscle cramps alot, If I drank more water I'm sure this would go away though, I also got bad acne on my chest. I never break out on my chest and when I take clen, it's so bad. I don't even wear low cut tops or anything. It clears up after my 2 week cycle though. I heard you should take taurine with clen, I don't know why though.