Is Folsäure useful for allergy?

Whether folic acid (vitamin B9) is useful for allergies remains inconclusive based on current evidence. Folic acid is crucial for cell division and immune function, but specific benefits for allergic conditions are not well established. Some observational studies suggest that adequate maternal folic acid intake during pregnancy may reduce the risk of asthma and allergies in offspring. However, other studies show no effect or even an increased risk with high doses. For adults with existing allergies, there are no robust clinical trials supporting folic acid supplementation as a treatment. Correcting a deficiency is always advisable, but using folic acid specifically for allergy relief is not evidence-based. The evidence is best described as 'mixed': mechanistic plausibility and some epidemiological hints exist, but no confirmatory RCTs. Consumers should not rely on folic acid for allergy management; instead, proven strategies like allergen avoidance and prescribed antihistamines are recommended. An allergy test (e.g., IgE blood test) can help identify individual triggers.