I have adult ADD. I'd be willing to answer any questions you have. For now, I can tell you how it has affected me and what treatments I've taken/done.
I was diagnosed as a kid, and put on ritalin, but never liked the way it made me feel. Upon late middle school/early highschool I came off the medication and used a vitamin supplement called "Spark" and it worked just fine. To be honest my ADD never was a huge problem until I entered college and it began to take it's toll on my grades and job. I'm on very thin ice with my current job right now because of it.
Recently I went to this place called the Amen clinics and had a spec scan and blood work done which revealed an iron and vitamin d deficiency. So I'm now doing a daily dose of vitamins day and night and have been for a couple months now. The doctor claims it will bring me to the point of no longer needing stimulants. Oh I'm also on Vynase now and have been before going to the clinic. Beforehand I was on strattera and it had bad side effects of depression. I feel like a guinea pig and it is very frustrating that many people don't believe ADD/ADHD is real.