thats a low dose, bump it up to 50 if you can, ive tried 50mg a day oral, leans me out and ill still get some gains!, and ripped like a mofo... but 50mg minimum... dont take a chick dose..
I can get some results at low dose, but only if i'm really lean already. I have seen guys with higher bf levels try low dose and get nothing. I'd say under 10%. You could always try it and bump up if you have to.