The Efficacy of Quercetin in Attenuating Oxidative Stress and Clinical Symptoms in Allergic Rhinitis: A Systematic Review
Abstract
Background: Allergic rhinitis (AR) affects approximately 10% - 30% of the global population and represents a significant healthcare burden. The condition involves complex inflammatory pathways where oxidative stress plays a crucial role, with malondialdehyde serving as a key biomarker of cellular damage. Quercetin, a naturally occurring flavonoid, demonstrates promising antioxidant and anti-inflammatory properties that may benefit allergic rhinitis management.
Methods: We conducted a systematic review following PRISMA 2020 guidelines. Four electronic databases (PubMed, Google Scholar, SagePub, and Semantic Scholar) were searched for studies published between 2000 and 2024. The PICO framework guided study selection, focusing on quercetin intervention in allergic rhinitis models. Both preclinical and clinical studies measuring malondialdehyde levels or clinical symptom improvement were included.
Results: Eighteen studies met our inclusion criteria, comprising 14 animal studies and four human clinical trials. Preclinical evidence consistently demonstrated quercetin's ability to reduce malondialdehyde levels across various tissues, including serum, lung, and liver samples. Human studies showed superior symptom improvement when quercetin-containing supplements were added to standard therapy compared to conventional treatment alone.
The primary mechanism involves nuclear factor erythroid 2-related factor 2 pathway activation, enhancing endogenous antioxidant enzyme production.…
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Evidence Hub reads this as a systematic review, done in people. Its evidence level is 1 of 5 (Highest · pooled evidence). Pooled evidence from several studies sits at the top of the evidence pyramid.
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