I'm not sure if the iron in a multi-vitamin is somehow more toxic than the iron in food, but I do know that it can build up sometimes. I don't think men should be taking multi-vitamins with iron in them at all.
Furthermore, there are a lot of people who unknowingly begin to accumulate too much iron because of genetics. Unfortunately, many people don't ever find this out, and they develop things like diabetes, heart disease and cancer as a result of an overload of iron - the iron begins to harm their organs. Even things like thryoid issues can be caused by excess iron. Meanwhile, it's these disorders/diseases that are treated, and the iron problem isn't always discovered in time to prevent these issues. Unfortunately, an iron-panel isn't part of a routine physical exam (not part of the regular panel of blood tests that are done), and so consequently - iron levels can begin to accumulate for a long time before the excess is discovered.
Ironically (pun intended), the symptoms of iron overload mimic the symptoms of iron-deficiency anemia. Pretty severe fatigue. Next is stuff like joint pains and a peculiar change in one's skintone (advanced iron overload causes a noticeable 'bronzing' of skin).
Fortunately, iron overload is treatable, and very effectively so (provided it's caught in time before the iron harms the organs) by regular blood donation. In fact, the 'treatment' for iron overload is a schedule of up to twice-weekly phlebotomies if the iron level is very high. The goal is to offload the iron as quickly as possible, in order to prevent serious complications. If a case of iron overload is discovered fairly early, then the problem can be resolved with just a few phlebotomies.
Another thing to consider is the fact that the standard diet is fairly high in iron, since most grains and cereals etc. are 'fortified' with iron. Thankfully, those of us on a LC eating plan won't be eating a whole lot of 'extra' iron in the form of refined carbohydrates.
Um...personally I don't think anyone should take multi-vitamins with iron in them at all. Not unless their doctor has specifically recommended them because of a potential anemia. There's a lot of iron in red meat, spinach, shrimp, all kinds of stuff, so I can't imagine a scenario in which too many people would be 'iron-deficient' unless they had a lot of blood loss for some reason.
If you're curious - look up 'iron overload' and 'hemochromatosis' - interesting stuff there about excess iron.
I went to the doctor a few months ago, complaining of severe fatigue. Turns out my iron saturation was at 70%, and iron saturation for pre-menopausal women should never be over 40% maximum. Luckily, one messy phlebotomy did the trick. As did ditching my vitamins. My multi had iron in it, and I was taking 1,000mg or more daily of Vitamin C to combat my flagging energy levels. In addition, the "Super B-complex" I was taking also had a bunch of Vitamin C in it. Of course, the multi had vitamin C in it too.
Turns out that Vitamin C greatly increases the absorption of iron. Now, this is nothing to worry about if you don't have an iron overload - but if you do, or you have had this situation, then you *don't* want to be taking supplemental Vitamin C either.
Anyway, just throwing out a few bits of info.
Get rid of your multi-vitamin with iron in it.