>Miswak' sticks are popular in the Middle East/Northern Africa.
that is for cleaning the teeth, and I read somewhere that there is some evident that it is somewhat effective in reducing tooth decay.
https://en.m.wikipedia.org/wiki/Miswak
in India there was or is a toothpaste brand called Meswak, which includes miswak as an ingredient.
nice wordplay in your username :)
>evident
evidence, voice typing error.
Raw mastic gum seems to be gaining popularity in the US.
Neither is popular for the explicit purpose of cognitive enhancement, though.