In my humble opinion, yeah vitamins and minrals are worthless. The best way to get your supplements are through your food.
I purchased big bottle of vitamins/minrals on the recommendation of my MD. Now I am hesistant to take it. I try to ensure that I am eating a variety of foods to cover all my supplements from natural source.
Anything, which is man-made, the liver has to work hard to break it down. And toxins build up in the liver. But our livers knows exactly how to break down foods. Hence eating right is much better.