Quercetin, a plant pigment found in many fruits and vegetables, has been shown to have antihistamine and anti-inflammatory properties. These properties make it a potential natural remedy for easing allergy symptoms such as runny nose, sneezing, and itchy eyes. Quercetin may help reduce the production and release of histamines, which are chemicals that trigger allergy symptoms. Some studies have also suggested that quercetin may have a protective effect against asthma. While more research is needed to fully understand its effects on allergies, adding quercetin UK supplement to your diet may be worth considering for those seeking natural relief from allergy symptoms.