I've tried a few supplements / multi-vitamins over the years but the only one I've ever seen results from is
Juice Plus which is basically all the vitamins and minerals of fresh vegetables compacted into tablet form (they have capsules, chewable tablets and gummies).
The results are really good - more energy, better overall health, and much better immunity, I used to get 3 colds a year before I started taking Juice Plus, now I'm lucky to get one and it lasts all of 2 days instead of a week.