How are Ferritin Eisenmangel and Allergie related?

The relationship between ferritin (iron deficiency) and allergies is not clearly established. Some observational studies suggest that low ferritin levels may be associated with an increased risk of allergic conditions like asthma or atopic dermatitis, possibly due to impaired immune regulation since iron is essential for immune cell function. However, findings are inconsistent: other studies found no significant link or even an inverse association. Additionally, inflammation itself can alter ferritin levels (acute-phase response), complicating interpretation. A direct-to-consumer DNA test for ferritin or allergies is not useful, as genetics contribute only modestly. Environmental factors, diet, and microbiome play larger roles. If iron deficiency is suspected, a doctor should measure serum ferritin and investigate underlying causes. Self-supplementation with iron without diagnosis is not recommended, as excess iron can be harmful. Overall, the evidence for a causal relationship is weak and based mainly on mechanistic reasoning and observational data.