Well based on my reading and asking , clen has a longer half-life , so alb. is dosed every 4 hrs and less of a receptor build up issue than clen. This is the main point so if you ever have any sides from it is out of your system quicker. A quick internet search will give you the science that I don't. Also cpl days ago I posted a albuterol vs. clen topic in forums ,maybe a few guys responded so thats worth checkin out.