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Quercetin, Bromelain and Vitamin C

By Victoria Weinblatt

People take dietary supplements with the goal of improving or maintaining their health, particularly, quercetin, bromelain, and vitamin C. Quercetin is found in fruits and vegetables, and when ingested it acts as a histamine inhibitor. Bromelain is an enzyme that comes from pineapples and may reduce inflammation. Vitamin C is a water soluble vitamin necessary for the growth and repair of the body’s tissues including cartilage, bones and teeth. These three supplements are used to treat conditions such as asthma, allergies and cases of angioedema. Before starting a supplement regimen, consult with your health professional; especially if you are pregnant or have a preexisting health condition.


Asthma, a disorder affecting the lungs, manifests as “sudden fits of wheezing, coughing or shortness of breath,” according to information from the University of Michigan Health System. Adding quercetin, bromelain and vitamin C may relieve asthma symptoms for some patients. Quercetin has an inhibiting action on the enzyme lipoxygenase, which may have a role in inflammation. Bromelain reduces the viscosity of mucus and vitamin C may reduce the likelihood of bronchial spasms.


Taking the supplements quercetin, bromelain and vitamin C may help relieve allergy symptoms, according to Dr. Kathi Kemper from the Center for Integrative Medicine at Wake Forest University Baptist Medical Center. Kemper explains vitamin C acts as mild antihistamine and recommends taking quercetin and bromelain simultaneously. However, she urges allergy sufferers to contact their doctors before starting regimens of these supplements.


The supplements quercetin, bromelain and vitamin C are suggested by the University of Maryland Medical Center to relieve the symptoms of angioedema. This health condition, often caused by an allergic reaction, refers to swelling located in the tissues just underneath the skin, commonly around your eyes and lips. Although not proven conclusively, vitamin C may lower histamine levels, quercetin could reduce your allergic sensitivity and bromelain is used to reduce inflammation.


Prostatitis is inflammation of the prostate caused by acute bacterial prostatitis, chronic bacterial prostatitis, chronic non-bacterial prostatitis, and prostadynia. Suggested supplements to treat the symptoms of prostatitis, according to the University of Michigan Health System, include quercetin, bromelain and vitamin C. UMHS says quercetin and bromelain may improve symptoms of chronic non-bacterial prostatitis. Taking vitamin C is speculated to change urine composition in such a way that inhibits the growth of the E. coli virus, the most common cause of chronic bacterial prostatitis.


As with any dietary supplement, follow the directions on the label to reduce your risk for side effects. The University of Maryland Medical Center recommends avoiding bromelain if you have a citrus allergy or if you are taking anticoagulants, as it may increase the risk of bleeding. Also, vitamin C in high doses causes diarrhea.

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