Someone mentioned nootropics so I'll chime in. I've been taking the nootropic Piracetam for about 3 months now, and I can say there is a definite 'sharpness' or rather what I call 'clarity' in the way I think and function now. I recently took a break from piracetam, but when I started again, I could tell the difference under an hour. Nootropics are worth a try if you are interested in an increased mental sharpness or intelligence.