Do Onions Help Allergies?

Yes, onions, particularly red onions, may help alleviate allergy symptoms. This is due to their high concentration of quercetin, a powerful natural antihistamine.

Quercetin, a flavonoid responsible for the deep red color in red onions, works in several ways to combat allergy symptoms:

• Reduces histamine release: Quercetin helps calm the cells that react to allergens like pollen and dust mites, thereby reducing the release of histamines, the chemicals responsible for allergy symptoms.
• Anti-inflammatory properties: Quercetin possesses anti-inflammatory properties, which can help lessen the inflammation associated with allergic reactions.

Several sources support this: Healthline highlights quercetin's action as a natural antihistamine. BBC Good Food and another source (article from April 11, 2023) specifically mention quercetin in red onions calming cells reactive to allergens. A study (Therapeutic effect of topical administration of red onion extract) even showed a reduction in allergic rhinitis symptoms with topical onion extract. BSW Health lists onions among foods that fight allergies due to quercetin's anti-inflammatory and antioxidant effects.

Important Note: While onions may offer some relief, they are not a cure for allergies. A proper diagnosis from a healthcare professional and a comprehensive allergy management plan are crucial for long-term allergy control. Also, individuals with onion allergies should avoid consuming onions.