Veronica is correct. There are several posts that you can check.
I just wrote one the other day.
You can try Occupational theraphy for ADHD. Do a google search...
Go to a really reputable health food store and see what they rec.
Stay clear of processed foods, dyes, MSG, dairy, chemicals, aspartame, etc...
Getting tested for food allergies is always a good thing to rule out !
ADHD and allergies can overlap. If your child has an allergy to a certain food(s), then, that can make a child irritable.
Feingold.com is a good resource !
Does your child have an sensory processing?