I ran out of my iron supplement about a month ago and didn't bother to buy more. Sure enough 2 days after I finished my period, I got a nasty virus. Finally I put two and two together and realized how important iron is to the immune system. The only time I EVER get sick is right after my period finishes! I'd be curious to know if this happens to other women at the end of their periods. Anyways, my message is for women - if you are anemic or borderline anemic, don't forget to take iron!