Doctor's Best Quercetin Bromelain 180 Veggie Caps combines two powerful anti-inflammatory nutrients in one formula. Quercetin is a plant-derived bioflavonoid with potent antioxidant and anti-inflammatory properties, including the ability to inhibit histamine release from mast cells (supporting allergy-related symptoms) and inhibit inflammatory signalling enzymes. Bromelain, the pineapple-derived enzyme, enhances quercetin absorption and adds its own anti-inflammatory and mucolytic (mucus-thinning) properties.*

• Quercetin — potent bioflavonoid antioxidant and anti-inflammatory*
• Bromelain — enhances quercetin absorption and adds enzyme activity*
• Supports healthy histamine response and seasonal allergy comfort*
• Supports healthy inflammatory response throughout the body*
• Supports immune function and antioxidant defence*
• Non-GMO | Gluten Free | Vegan | 180 veggie capsules

Suggested Use: As a dietary supplement, take 1–2 capsules twice daily, preferably between meals.

Frequently Asked Questions

What is quercetin and why is it combined with bromelain?

Quercetin is one of the most abundant dietary flavonoids found in onions, apples, and berries, but its oral bioavailability is limited by poor solubility and rapid intestinal metabolism. Bromelain enhances quercetin's absorption by acting as a bioperine-like bioavailability enhancer, reducing the enzymes that break quercetin down in the intestinal wall. Together they also act synergistically — bromelain's protease activity complements quercetin's flavonoid mechanisms for a more comprehensive anti-inflammatory effect.*

Can quercetin help with seasonal allergies?

Yes. Quercetin inhibits the release of histamine and other pro-inflammatory mediators from mast cells and basophils — the immune cells responsible for allergic reactions. By stabilising mast cell membranes, quercetin reduces the histamine cascade triggered by allergens. This makes quercetin a popular natural option for those seeking to reduce the severity of seasonal allergy symptoms through immune modulation rather than antihistamine receptor blocking.*

How does quercetin support immune function?

Beyond histamine modulation, quercetin has been shown to inhibit pro-inflammatory transcription factors (NF-kB), reduce production of inflammatory cytokines (IL-6, TNF-alpha), and provide antiviral properties through inhibition of viral replication enzymes. Research has also highlighted quercetin as a zinc ionophore — helping to transport zinc into cells where it can inhibit viral RNA replication, complementing zinc's well-known immune support role.*

How long do I need to take quercetin to see allergy benefits?

For seasonal allergy support, quercetin is most effective when started 4–6 weeks before the allergy season begins, as it works best through cumulative mast cell stabilisation rather than immediate antihistamine blocking. Ongoing daily use through allergy season maintains the protective effect. For general anti-inflammatory and antioxidant support, consistent daily use over 8–12 weeks provides the most meaningful results.*