Great list @honore. Thank you for posting. I would encourage you to investigate CILTEP and add it to your list. I'm more a fan of the natural compounds for sure. The mechanism of action in CILTEP revolves around cAMP and AMPK which are great for focus. I think it depends on your objectives with each supplement. 
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Clitep has been debunked.
Really? It seems that Abelard Lindsay researched it well. Do you have research. I like Natural Stacks in general.
Hey, if you like natural stacks, the best one out there is PowerFocus®. Its all natural and very highly reviewed.