Many people assume that because they aren't taking a pill labeled "iron" that they aren't supplementing. Start reading labels of bread, pasta, grains, oatmeal, cereal, etc.-- you'll see most have been fortified with iron. Look on YouTube to find science experiments where cereal flakes respond to magnets due to all the iron in there. Try to minimize heavily iron-fortified grains, red meat, and liver-- all high in iron.