How are B12 and Allergie related?

The relationship between vitamin B12 and allergies is not well established. Some observational studies suggest a possible link between low B12 levels and increased risk of allergic conditions like asthma or eczema, but randomized controlled trials proving causality are lacking. B12 is important for immune function and cell division, but supplementation for allergy prevention or treatment is not supported by strong evidence. Caveat: case reports of B12 deficiency mimicking allergy symptoms (e.g., fatigue, skin changes) do not equate to allergy. Always consult a doctor if allergy is suspected.