I don't know if this is relevant to this discussion but a simple experiment was tried recently in some Northern schools here in the UK.To give the example of one child who did next to nothing at school, came home and flopped on the sofa to watch TV or play video games never doing his homework (you know what I mean), he was transformed by using this "wonder" food additive and now is attentive in class, loves doing his homework, thinks the library is the best thing since sliced bread, in short a totally different person.
The name of this "wonder" ingredient, cod liver oil, which after a few weeks had such a dramatic effect on those using it ( some were given placebos) that everyone was given it.
For those of us in the UK there was a BBC prog. about it a couple of months ago. There may be a link from "Richard and Judy" ch. 4 website.
As I said I don't know if this is relevant to this particular situation, but good luck, if you can't help him now he might not get back on track.