I take .4 ml of MTX and 1 mg of Folic Acid. My MD did not even put me on the Folic Acid. I had to ask her about it when someone else mentioned it to me. She will increase me back to .6 ml if my labs are improving in August. Not sure if they increase the folic acid or not.
I'm taking 15mg MTX each Friday and 1mg of folate on the other days. Never took more because I don't really have any negative side-effects at this dose. At 20mg, I had a lot of hair coming out, but the dose increase didn't help anything, so we dropped back to 15mg.