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ANTIOXIDANTS

Quercetin (with Bromelain)

Immune · allergies · circulation

MODERATE EVIDENCEVEGANREAD THE RESEARCH
Written to our editorial standards · reviewed against published research· Updated 2 Jun 2026
Last reviewed: May 30, 2026
QUICK ANSWER

Quercetin: Immune · allergies · circulation. Plant flavonoid that supports a balanced histamine response, capillary integrity, and antiviral immune activity. Standard dose 500 mg, taken in the morning, about $18/month. Evidence rating: moderate evidence.

What is Quercetin?

Quercetin is a flavonoid pigment abundant in onions, apples, capers, and red wine. As one of the most-studied plant polyphenols, it has been investigated for its antioxidant, anti-inflammatory, and immune-modulating effects. Quercetin stabilizes mast cells, the immune cells that release histamine, which is why many practitioners use it to support a balanced response during allergy season. It has also gained attention for its zinc-ionophore activity, helping zinc enter cells where it supports antiviral defenses. Bromelain (an enzyme from pineapple) is often paired with quercetin to enhance absorption. Typical doses are 500-1,000 mg daily.

WHY IT MATTERS

Plant flavonoid that supports a balanced histamine response, capillary integrity, and antiviral immune activity.

Natural food sources

Where possible, get Quercetin from whole foods first. Common dietary sources include:

OnionsApplesCapersBerriesKale

Where to buy

Solgar Quercetin Complex with Bromelain
RECOMMENDED
Solgar, Quercetin
500 mg · Morning · ~$18/month

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Best for your goal

Interactions

Other antioxidants

Curcumin (with BioPerine)
Inflammation · joint · recovery
CoQ10 (Ubiquinol)
Cellular energy · heart
Alpha-Lipoic Acid (ALA)
Antioxidant · blood sugar · nerve health
Resveratrol (Trans)
Longevity · circulation · antioxidant

Common questions

What is Quercetin?
Quercetin is a flavonoid pigment abundant in onions, apples, capers, and red wine. As one of the most-studied plant polyphenols, it has been investigated for its antioxidant, anti-inflammatory, and immune-modulating effects. Quercetin stabilizes mast cells, the immune cells that release histamine, which is why many practitioners use it to support a balanced response during allergy season. It has also gained attention for its zinc-ionophore activity, helping zinc enter cells where it supports antiviral defenses. Bromelain (an enzyme from pineapple) is often paired with quercetin to enhance absorption. Typical doses are 500-1,000 mg daily.
What is Quercetin used for?
Immune · allergies · circulation. Plant flavonoid that supports a balanced histamine response, capillary integrity, and antiviral immune activity.
What is the standard dose of Quercetin?
500 mg, typically taken in the morning. Approximate cost is $18 per month.
How strong is the evidence for Quercetin?
Moderate evidence for its primary uses. See the full study list on the research page.

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