I did take vitamins & supplements, and still do, but not as regularly as I used to. I'll list the main ones, I tried quite a few extra things for awhile..

a good brand therapeutic dose multi vitamin
magnesium - good for muscles
Vitamin C
Vitamin D
B complex - stress helper
Methylsulfonylmethane (MSM) - good for nearly everything
http://www.msm-info.com/
Grape seed extract

I definitely could tell positive difference when taking MSM during my first RSI recovery time. The as I recovered I quit taking it, and kind of forgot about it until months into my RSI/TOS injury...

In fact I think I need to start taking it again for overall health..I've been lax with all vitamins lately and I can feel it..

There might even be some new vitamins/supplements that I'm not aware of- we have a forum that is active & up to-date on that topic- and you might be able to get more specific suggestions for your situation/symptoms -
http://neurotalk.psychcentral.com/forum49.html