For me I take Nutrilite vitamins (
http://www.nutrilite.com/) they don't do tv advertising so it's not always heard as much as GNC or Vitamin Shoppe (CHael takes one of their competitors USANA, they are also a direct to customer brand but the quality there is also good). I take the Mens Multi (Double X), fish oil balanced, milk thistle (I enjoy throwing back 1-2 beers often so it helps ease the wear on the liver), CLA 500 (maintain the little muscle tone I have), lutein for my eyes (I had lasik surgery in 2005 so protecting my investment).
That doesn't include the protein shakes I will take after my rolls/workouts, and the sports drink Nutrilite puts out too (similar to Gatorade/PowerAde). I balance this out with fruits and vegetables, minimizing my soda, I avoid diet soda (because of the aspartame), and I eat a lot of meat too (to try to build some muscle, I'm ectomorph so while I don't have to worry about gaining fat, I have to work hard for the little muscles I do have).