Someone knows which nootropics can help/support/enhace concentration/focus/alertness ?

cholinesterase inhibitors

any other stuff to combine with it ?
PS . some cholinesterase inhibitors products name ?

i forgot to say i take 200 mcg of Huperzine daily since a week but i cant notice a serious effect on my own concentration ...
maybe wrong daily dosage ?

Try 400 mcg and make sure its L-Huperzine A.

ok i'll try , any other stuff to combine with it to get better result ?
deprenyl + piracetam + cdp choline + choline bit + huperzine is a good combination for my goal ?

Deprenyl+piracetam+huperzine is fine...though I have no Idea about CDP Choline and Choline bit....