I take Life Extension two-per-day multis just in case I miss something in my regular diet. And I'll take lots of "C" if I think it's warranted (like when my wife has a cold)..which might just be a waste of money
But I do take other supplements, from CoQ10 (ubiquinol version) and fishoil (sorta mega-dose that stuff) to green tea and glucosamine/chondroitin. And creatine might count here, as it's been shown to have benefits beyond exercise/etc.
I do think that the idea that little doses of [whatever] can work miracles is awfully far-fetched and that too many people rely on taking vitamins/etc. instead of doing something more effective but not so easy (like lifestyle changes).