Everyone says 40 mg because the anavar they are doing is homemade and probably either underdosed or not all biologically available.
Not knocking these products because I will probably use them in the future. I had a friend who had a script he wasn't using and gave it to me. 280 2.5 mg american made I assume. I probably took between 15-20 mg day (it was a long time ago) and I am about 215, I never looked better.