Quercetin is a bioflavonoid and a natural pigment found in numerous foods. Quercetin’s unique properties allow it to interact synergistically with other bioflavonoids, and it may improve the absorption of other supplements as well.
 
Quercetin is an effective antioxidant, and it scavenges free radicals. Free radicals can damage cells and cause oxidative stress. Antioxidants prevent free radicals from accumulating and causing health problems. Quercetin also has anti-inflammatory properties and helps support the immune system.
 
People may take quercetin to try to manage a variety of issues, including:
Heart and vessel problems
High blood pressure
Prostate infections
Upper respiratory infections
Allergies
Disease prevention