Can B12 help with Allergie?

The question of whether vitamin B12 can help with allergies is not clearly answered by current science. Some observational studies suggest that low B12 levels may be associated with higher IgE levels or allergic symptoms, particularly in children with atopic dermatitis. However, randomized controlled trials proving a causal benefit of B12 supplementation for allergies are lacking. B12 is essential for immune function and cell division, but taking it without a confirmed deficiency is not recommended as an allergy treatment. The evidence is weak and based on associations, not clinical efficacy. Anyone with allergies should first seek medical evaluation (e.g., allergy testing, blood work) rather than self-supplementing. A B12 blood test can be useful if deficiency is suspected (e.g., vegan diet, gastrointestinal issues). DNA tests for B12 metabolism (e.g., MTHFR, FUT2) have limited predictive value. Bottom line: B12 is not an allergy remedy; adequate intake is important, but a therapeutic effect on allergies is unproven.