Yes, I've done quite a bit of research into both nootropics and nutrients that are good for the brain. Again cod liver oil is not only good for vitamins A and D but also contains essential fatty acids EPA and DHA, which are excellent for the brain. I'll look into your links later, but would recommend the following book by Patrick Holford called Natural Highs. It looks at not only making you smarter but more relaxed, motivated and connected to the world, via nutrition and supplementation. It is particularly good from the aspect that it doesn't go down the pharmaceutical route, and attempts to do things in a safe manner. However I think he needed to add a few provisos like you can overdo these things too, and some nutrients can accumulate over time and be counter productive.