OK! I hope it helps you. Maybe we can get feedback from some others who have tried it and like it. I believe Neti is a fan of it.
Nice shot of the label and awesome that the warnings are so clear.
I used it for about 2 months, a couple years pre-diagnosis, when I was grasping at natural and pharmaceutical straws.
I took the Vitamin Shoppe brand, 500 mg capsules, once or twice a day as needed (every day upon waking, and sometimes at lunch.)
It worked as well as a low-dose of Adderall (I'd liken it to about 10mg of Addy, tops), and it did somehwat improve my mood.
It did negatively affect my sleep if taken after around 2pm, but that wasn't a surprise.
I stopped it due to my worry about its long-term consequences and the lack of solid and compelling scientific evidence.
But generally, I found it to be very useful and experienced no side effects, other than jittery-ness at higher doses or with caffeine.