I do not have ADHD, but my teen does. He actually does really well on the various omega oils. Krill is good. Right now we are doing Flaxseed Oil & what it does is lubricate the synapses in the brain. I give him that, vitamin E oil, & a multivitamin. Together, they increase his ability to concentrate.
But also key is the component of exercise, to get rid of the excess energy. It also boosts his appetite, which he needs, while controlling the amounts of white flower/sugar/corn in his diet. These things cause a brain fog in him.
We have never gone the traditional medicine route, so no Rx for him ...yet, & with hope, never.
Good luck to you, hope that helps.