Jun 21, 2008 · The liquid Clen from Ar-R is dosed as Clen 30mL 200mcg/mL So if you want to do 20mcg then you need to get a 3ml syringe (no needle required) and suck up just under 1/8 ml and squirt it in your mouth. 50mcg will 1/4 ml and 100mcg will be 1/2 ml Taken from a post by Kale and I live by this on my Clen cycles.