I'm I tried Piracetam, Vasopressin, and Lucidril back in the '80s.
I was trying all sorts of nootropics, both straight-up drugs and nutritional supplements back then. Piracetam may have worked, but at the end of my experiments I found that about the best thing was boosting phenylalanine to help with caffeine.
Part of this may have been that getting a steady supply of many things (such as Piracetam) was both difficult and expensive in the USA.
I was trying all sorts of nootropics, both straight-up drugs and nutritional supplements back then. Piracetam may have worked, but at the end of my experiments I found that about the best thing was boosting phenylalanine to help with caffeine.
Part of this may have been that getting a steady supply of many things (such as Piracetam) was both difficult and expensive in the USA.