Supposedly Hydergine (and ergoline like LSD) increases blood flow to the brain.
Picamilon (N-Nicotinyl-GABA) suppsedly does this better than all of Hydergine, Gingko and the 'racetams. This is by far the only Noortropic that I actually benefitted from, and I think it is highly underrated.
Vincamine (from Periwinkle) should also do that. I found this one extremely helpful for dream memory, but it caused some GI disturbance.
I am not too fond of Gingko because it makes me dizzy even at low doses.
Oh. You can also sit down for a while and then stand up quickly. Like.. whoah dude!