Vinpocetine does work for me - at first when I took it I took it, forgot about it, until I went into a store, and noticed the huge color enhancement.
I try to take 20-40mg/day and there's a short term memory effect that same day but after daily use, I can remember long past events 'vividly' in my mind noticeably more. Also, I remember my dreams almost every night, not just one dream, but a big long stream of dreams.
When I quit taking it for a while, after some time went by I noticed I didnt remember my dreams hardly anymore, like "normal". If you want to notice something, buy the ones without caffeine and other crap added, I get a bottle of these 10mg ones with nothing else, and sometimes I take 30-40mg at once. Just take it and then go about your day, see if colors stand out later on.
Piracetam all that did was nothing, unless I took an "attack" dose, which, acted like a laxative maybe, making it feel like I got raped in the ass, running to the toilet often. To make sure it wasn't something else, I tried an attack dose a different day, and, another ass-raped feeling I had.. never heard of this but i got it lol.