The monthly period costs a lot of iron, as does pregnancy and a vegetarian or vegan lifestyle. A woman needs 15 mg of iron per day, but on average she only consumes 11.8 mg.

➜ For the metabolism

Iron turns the blood red. The mineral keeps the metabolism going and helps to transport oxygen from the lungs to the cells. This is why a lack of iron always means a lack of oxygen. And that's why you feel so limp and tired when there is too little iron in your blood.

➜ Through food

We absorb the mineral through our food. There is animal and plant-based iron - although the body finds it somewhat more difficult to absorb plant-based iron. Of course, you can also get it in capsule form from the pharmacy.

➜ The doctor should test

However, experts warn against taking supplements on your own: Too much can damage the heart and circulation. It's better to get tested by a doctor.