From Tim Ferris:

I’m often asked which “smart drugs” I use to improve mental performance and productivity.

I’ve tried everything imaginable, whether over-the-counter, prescription, or otherwise. For 90% of the options, the short-term benefits are not worth the long-term side-effects.

This video describes a few options that I’ve found to be sustainable and reliably effective.  Note that I will still “cycle” off of these at least one week out of every eight weeks.

[ Original Source: My Favorite “Smart Drugs” ]