Myths vs facts: Ferritin Eisenmangel and allergy

The claim that low ferritin (iron deficiency) directly causes or worsens allergies is not strongly supported by evidence. Ferritin is an acute-phase protein that can rise during inflammation, including allergic reactions, potentially masking true iron deficiency. Observational studies suggest associations between iron deficiency and increased risk of atopic dermatitis or asthma, but causality remains unproven due to confounding factors and lack of randomized trials. Furthermore, iron supplementation in the context of allergies may be counterproductive: iron can promote growth of certain bacteria and modulate inflammatory pathways. The myth that every case of iron deficiency exacerbates allergies oversimplifies a complex interplay. Fact: A ferritin test alone is insufficient to diagnose or manage allergies. Iron status must be interpreted alongside inflammatory markers (e.g., CRP), clinical symptoms, and a complete blood count. Consumer DNA tests claiming to predict allergy risk via ferritin-related SNPs lack clinical validation. Recommendation: If iron deficiency or allergy is suspected, seek medical evaluation with appropriate lab work (ferritin, CRP, IgE) rather than relying on direct-to-consumer genetic tests.