One of the minerals almost no healthy man needs is supplemental iron. The link between iron supplements in men and liver cancer is pretty GD convincing. I stay away from it as much as I can.
Almost everybody needs the B-complex, and I'm a dyed-in-the-wool proponent of fairly high (5-6 grams a day) vitamin C intake.
Just remember that the two main reasons to take a supplement is just that: to supplement. You are, 1) making up for dietary deficiencies (which, sadly we ALL suffer from to one degree or another) and, 2) battling environmental toxins, which, again, we all suffer from.
(Hell, they even found pollution in a snow core sample from the peak, the fuckin' Penis EnlargementAK of Mt. Everest! )
Also, don't forget that vitamins don't "work" without food, they ain't a substitute. And the better quality of food you eat; the better the vitamins will help out.
Many foods are "anti-nutrients", and will literally suck the life outta ya.
Processed, refined, cooked...all on the short list. I can't remember who it was who said it, but I try to follow this advice as much as I can: "If man made it, don't eat it".
It can get kinda expensive, but a doctor of mine once said , "Yeah, but how much is it worth to ya to not be in the hospital dyin', hooked up to tubes and wires?"
I try to look at a good diet and supplements as the cheapest, most effective health insurance I could buy for myself.
Good luck to ya.