I tried it for a while, zero noticeable affects, stopped, again zero noticeable affects.
Same with high doses of vitamins.

Somebody said, You won't notice any benefits unless it's under controlled lab conditions, well if that's the case a ~1% gain isn't worth the time , $, and hassle. at least not for me.
I think a lot of this stuff is the placebo affect.
Maybe some see a gain, I sure don't.