Iron supplementation can be beneficial for some people who are at risk of deficiency such as pregnant women, female athletes or women with heavy menstrual cycles. To get the most out of iron supplements, avoid taking them with coffee, tea or milk. These beverages contain substances that can inhibit the absorption of iron. Wait 90 minutes or more to consume these drinks after taking iron. Vitamin C and meat proteins can improve iron absorption. Check with your physician before adding an iron supplement to your diet.
Source: National Institutes of Health