Summarize this article in one sentence.
If you do not enjoy eating iron-rich foods (or on days when you're just too busy) another option is to take iron supplements. Iron supplements are inexpensive and safe. Avoid taking high-dose iron supplements if you aren’t anemic since too much could damage vital organs. Unfortunately, iron supplements can have negative side-effects. Some of these are mild, and may go away as your body gets used to the medicine. Other side-effects (though less common) may be serious and should prompt you to seek medical care. Of course, if any side-effect is bothersome, or if you have questions, contact your doctor right away.  Side-effects that do not usually need medical attention include:  Constipation Diarrhea or vomiting Leg cramps Dark urine Stained teeth Heartburn   Side-effects that should prompt medical attention include:  Backache or muscle pain Severe nausea or vomiting Metallic taste Dizziness or fainting Pain, numbness, or tingling in hands and feet Fast heartbeat Severe headache Flushed skin Rash or hives Trouble breathing Swelling of mouth and throat Whether it is consumed in food form or by way of supplements, vitamin B-6 is a necessary companion for iron. Whenever you take iron supplements, pair these with a supplement of vitamin B-6. If you take calcium supplements, be sure that you do not take more than the recommended daily amount. A surplus of calcium in your system can make it more difficult for your body to absorb iron.

Summary:
Take iron supplements. Beware of side-effects. Supplement vitamin B-6. Avoid taking too much calcium.