No real effort; I just read comments for 6 hours straight or so and paid attention to people who were referenced as high status or knowledgeable, then paid extra attention to the stacks or suggestions of those people, and came away with the impression that choline was recommended. It was by no means scientific and it could be that choline supplementation isn't necessary. Hopefully there's some literature on the subject; I plan on looking a lot closer in a few weeks when I start to really do some research into nootropics and other IA.