These links will help you more than I could explain it. Right now am running a clen/T3 cycle. I use Big Andy's clen cycle (the 2nd one mentioned) from the link below with 25mcg of T3 ed.
Thanks Dj. I may just use the Clen. T3 sounds a lot more dangerous than I thought it was. So many guys doing it without a care in the world....thats pretty scary.