[bartonfink]

I take 1500 mg aniracetam daily and find that it makes a notable difference in my cognition. I'm able to maintain a train of thought without having to spend effort leaving mental "breadcrumbs" to retrace my steps.

I don't know if this is the state of the art, but it seems to work well for me. My brain works well enough that I don't see much benefit to tinkering with my own chemistry to eke out a few more cycles. My biggest obstacle is that some malicious trick of evolution forces my body to lie dormant for roughly a third of every day instead of actually doing stuff.