I've had interesting and unexpected results taking Lecithin supplements. There is a stimulating effect similar to caffeine or a B12 shot, and there is also a focusing effect where I could not stop fixating. I can have a tendency to day dream but not on Lecithin. It makes your train of thought very hard to derail. I still take it sometimes but not regularly. It hurts my stomach and can be a bit too much sometimes.

As far as I understand, lecithin breaks down/converts to choline an inositol, and it's these which are causing the mental effect. Since it's a food, the effects aren't as immediate. You'll notice it more on day two.