What role does B12 play in Allergie?

The role of vitamin B12 in allergies is not clearly established. B12 is essential for DNA synthesis, cell division, and immune function. Some observational studies suggest an association between low B12 levels and increased allergy risk (e.g., higher IgE, atopic dermatitis in children). However, evidence is mostly observational and not causal; randomized controlled trials are lacking. Deficiency may be confounded by diet or gut health, which themselves affect allergy risk. Supplementation for allergy prevention or treatment is not supported by current evidence. The provided context does not contain specific information on B12 and allergies. This answer is based on general scientific knowledge.