My favorite one is Coluracetam.
![Wink](https://bitcointalk.org/Smileys/default/wink.gif)
This powerful neurotransmitter is central to several cognitive functions including focus, motivation, learning, and memory. The supplement is particularly effective in regions of the brain that control sight (vision) processing. More other stuff you can read here:
https://nootropicboost.com/buy-best-nootropics/coluracetam/ is it dangerous? I think even chocolate can be dangerous if you eat it too much. You need to know the measure. And everything is going to be OK.
![Cool](https://bitcointalk.org/Smileys/default/cool.gif)
I haven't heard of coluracetum but I will check it out. My eye sight has somewhat diminished over the years from excessive computer usage (I presume) and so this supplement sounds perfect.
The link that you have posted my is giving a warning that the website has not been configured properly. I'll use google instead.