Very effective, but quickly diminishing returns for me. If I do one pill a week, that day is awesome. But as soon as I step it up to 2 I'm overwhelmed and might even take a nap I wouldn't have otherwise. This is only 100mg.

But the reason I stopped taking it is that I'm just a salaried employee. It doesn't matter if I'm super focused or not. I'm still getting paid the same amount. There's no point in artificially elevating myself.