I did try a lot, from specific amino acids to herbs, vitamin complexes… and i have only 3 worth mentioning:
Fish oil (omega3)
D vitamin (helps with my mood)
L-Thyrosine (only 1-2 times a week, and only if i feel exhausted without a proper reason)
And my extra: dark, real chocolate (not too much, just 1-2 bites) is a little stronger than coffee, and works better with Ritalin for me, if i keep it to the “time to push” times. (i think i drank way too much coffee, and its not really doing anything anymore)
Oh, and water! I tent to cover my daily fluid with coffee… and i have to remember to drink water, but i can tell the difference for sure
But nothing will work more than quality sleep, even naps if needed, and regular exercise.