I wonder what the net difference really is to your body though. Basicly I've always thought it was one of those "law of diminishing returns" scenarios. You know, where the premium vitamin is better when compared to another on paper but that the total return to your health is negligible overall. (But I haven't done the research to back that up so I wouldn't put much stock in the opinion I just typed.)
I know this doesn't sound as obsessive compulsive as I normally am but I generally figure that as long as I get a mult-vitamin I'm probably going to be fine. Heck, last time I bought the Walgreens knock-off version of Centrum.