No. Supplements may cause hyperactivity. Some herbals contain barbiturate like chemicals that sedate people. Most herbal medications are more dangerous than the medications used to treat adhd properly. There was a recent report that omega-3 fish oils may impact adhd positively, but the effect was tiny.
Yes. First understand where the hyperactivity is coming from. Dietary changes can impact it a lot. I would encourage you to see a practitioner that can guide you to the right ones for you. A naturopath can help as can a chinese medicine practitioner, a homeopath, and your physician as well. You may also be pleasantly surprised at how eliminating dairy and gluten can improve symptoms. Worth a trial.