Yes clen is not aas, it is a bronchodilator. First time I ran it i started at 40mcg a day. It doesn't hurt to start at 20 though. Run 2 weeks on 2 weeks off. Expect shakiness, headaches, and high blood pressure. I always keep a close eye on my bp when I run clen or aas. Don't use it as a crutch. Get your diet in check and it will help bring results. Stay hydrated and good luck.