What is a good vitamin for adhd?

ADHD vit.: None, but sometimes adjunctive use of Fish oil or Flaxseed oil might help.

None specific: There are no good studies that point to the use of specific vitamines in managing ADHD. Some have suggested B complex vitamines as being helpful, but there is a lack of double blind controlled studies.

ADHD Vitamin?: ADHD is best treated on all fronts, including from the perspective of health. Ones overall health plays a role in one's symptoms. As such, vitamin supplementation can make sense where you are concerned that your diet is insufficient. Recommend you use common sense, although there are not double blind studies out there, doesn't hurt to cover your bases. And small improvements add up.

B's: It would be worth taking a good multi, I would get Vit D tested and supplement if indicated It would also be good to take essential fatty acids(-fish oil)