What behavior is your son displaying that your Doctor would think he has ADHD and did the Doctor have a suggestion . A lot of children have some behavioral issues , of course you can look after them ,it is possible that he needs a multiple Vitamin-mineral supplement with anti oxidants, B Complex and Vit C also a lot of parents find fish oil is valuable,.give an instance of the behavior you took him to the Doctor for , we may have more feedback for you.