It really bugs me when people label boys ADD just because they're high energy. You could've been describing my son...the boisterous behavior coupled with amazing intelligence.
I do know that many parents don't want to deal with a "challenging" child. That being the case, I would encourage you to have your son invite his playground buddies (I hesitate to call them friends since they aren't acting like friends) over for a play date, maybe 1 or 2 at a time. Perhaps that will make your son feel more included. If that doesn't work, help him to find friends through non-school sources, like his baseball team, house of worship or other extra-curricular activities.
That said, I would encourage you to help your son find other ways of measuring his self-worth. Have him focus on what he does really well, like school or his music lessons or baseball. He needs to think well of himself, accept himself as he is, rather than depending on his playground buddies for acceptance.
In addition to vitamins, you may want to have him allergy tested. My boisterous youngster really settled down after we learned he was allergic to cow's milk...and he was drinking a half gallon of it a day. Oops! You may find there's no medical reason for his behavior; he just has a lot of energy. That's ok, too.
The bottom line is this: the things that challenge you and your son now will be huge assets when he matures. Who doesn't want an enthusiastic, sharp employee who is focused on the end result?
Good luck!