Synopsis

Source of validity: Scientific
Rating (out of 5): 3

Quercetin is a plant flavonoid commonly found in onions, apples, and berries. Its use to support the respiratory system has a basis in scientific literature, though the evidence is moderate and largely preliminary. Quercetin is known for its antioxidant, anti-inflammatory, and antihistamine properties, which potentially benefit respiratory health. Several in vitro and animal studies have shown that quercetin can inhibit the production of inflammatory mediators involved in allergic and asthmatic responses, such as histamine and cytokines. Limited human studies suggest that quercetin supplementation may reduce airway inflammation and improve symptoms in individuals with allergic rhinitis or mild asthma, but these studies are often small and short-term.

During the COVID-19 pandemic, quercetin received attention for its potential antiviral properties, including possible inhibition of viral entry and replication, but clinical evidence remains inconclusive. While quercetin is not a standard therapy for respiratory conditions, its mechanistic actions and some clinical findings support its use as an adjunct for respiratory support, particularly in allergic or inflammatory settings. However, larger, well-controlled clinical trials are needed to confirm its efficacy and safety for respiratory health.

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