Be careful, I have yet to see or hear about ANY credible clinical research that supports the efficacy of natural supplements for ADD. While you will have no problem finding posts from those that claim they work, I would be really careful. If you're seeking some relief from ADD symtoms and do not want, or have, the option of medicinal treatment, then you might try finding an ADD coach who might be able to provide ways to help you cope with symptoms.
Best of luck to you.