Iron is an important nutrient that you can only get from food, and it comes in two forms: heme iron and nonheme iron. Heme iron comes from animal sources like red meat, fish, and poultry, and your ...

Heme is a coordination complex consisting of a porphyrin ring surrounding a single ferrous (Fe 2+) or ferric (Fe 3+) ion, able to bond with diatomic oxygen and transport it around the body. Four heme ...