This is some absolutely wrong dosage, please don't ever take actual 400ug doses unless you really know what you're doing. Most tabs sold as 200ug are in the 30-80ug range, so people tend to severely overestimate the dosage.
I absolutely agree that non-experienced users should start off with low doses, no more than 100μg. I am very experienced with psychedelics and knew what I was getting into when I took higher amounts. My point was simply that low doses may not result in "life changing experiences", for some to experience that (such as myself) higher doses may be required.