The amount of misinformation in this thread is just frustrating. Most men don't need iron supplementation because they don't bleed 5-7 days each month. In fact, even most women don't need iron supplementation; even most women with menorrhagia don't need iron supplementation. Only vegetarians/vegans, pregnant women, and people with huge amounts of bleeding loss during menstruation (around the order of 80-100mL per day) I would say require regular iron supplementation. Nobody else actually needs it - meat is a very rich source of iron, and the body is very efficient at retaining it. The difference between male and female required intakes of iron is almost purely due to menstrual loss - post-menopausal women require a similar amount of iron to similar-age men, which is also the same as the intake for 20-year old men. No, taking a multivitamin every other day won't actually make a difference. If you aren't deficient, you don't need it anyway, and if you are deficient, then taking a multivitamin won't help that much either.
What's even more frustrating, though, is that you guys all take this information completely uncritically and don't take the time to quality-control this information that currently has an open highway into your head. I expect that with whatever I say, someone will do background reading into it and correct me if I'm wrong - this helps me as much as everyone else. Whereas you guys are just sitting there pouring information into each other's heads with no clue and no care as to whether it's the elixir of life or radioactive sludge.