How are Transferrin and allergy related?

Transferrin is an iron-transport protein primarily involved in iron metabolism. A direct, well-established relationship between transferrin and allergies does not exist. Allergies are immune-mediated reactions involving IgE, mast cells, and cytokines. Some studies suggest an indirect influence of iron status on immune function: iron deficiency may modulate immune responses and potentially affect allergy susceptibility. However, findings are inconsistent and insufficient to recommend transferrin as a biomarker for allergies. In practice, allergies are diagnosed via specific IgE antibodies, skin tests, or clinical symptoms. Transferrin measurements are used to assess iron status, not allergy diagnosis. The evidence for a direct link is therefore rated as 'unclear' or 'mechanistic'. Consumers should not rely on transferrin levels to evaluate or manage allergies.