Antioxidant
Quercetin
Also known as: Quercetin dihydrate, Quercetin phytosome, Quercetin Phytosome® (Quercefit®), Quercefit
Quercetin is a flavonoid antioxidant with anti-inflammatory properties; the Phytosome® delivery system uses phospholipids to enhance absorption compared to standard quercetin. Evidence supports potential benefits for allergies, cardiovascular health, and exercise recovery, though human clinical data remains moderate.
Last reviewed June 2026 · Evidence graded from peer-reviewed research, not editorial opinion. Educational only — not medical advice.
Primary uses
- Allergies
- Inflammation
- Immune support
- Senolytic
- Antioxidant support
- Anti-inflammatory response
- Allergy symptom management
- Cardiovascular health
- Exercise recovery
How it works
- Mast cell stabilizer
- Inhibits inflammatory enzymes
- Senolytic (clears senescent cells)
- Zinc ionophore
Dosage
- Typical range
- 500-1000 mg daily
- Timing
- Divided doses
- With food
- Yes
- Duration
- Safe long-term
- Special populations
- Allergies, inflammation
Forms
- Quercetin phytosome
- With bromelain
- Standard
- Capsule· 70/100
- Powder· 70/100
Safety
Common side effects
- Well tolerated
Contraindications
- None
Products containing Quercetin
Top-scoring supplements in our catalog that list Quercetin on the label. Each product is graded on Formulate's ingredient-level rubric — dose accuracy, form, transparency, and third-party testing.
Known interactions
Evidence notes
Broad anti-inflammatory effects
Grade B: Some human trials support key claims; further confirmation needed.
Cited research for Quercetin
Clinical studies referenced across Formulate guides that mention quercetin. Each links to the full study page with PubMed source + the guides that cite it.
Quercetin compared head-to-head
Related in Antioxidant
Check a full stack
Formulate's free interaction checker lets you paste in any combination of supplements and medications at once — every pairing flags severity, timing, and cited evidence.
Open the checkerWhere does Quercetin fit in your stack?
Answer two questions and get a stack graded on research — every ingredient scored on the evidence behind it, not the marketing.
Build my stack2 questions · free · no account needed to start
Also on iPhone — get the free app
Evidence-based supplement guides, no spam
We send a short digest when new guides drop — nothing else. No affiliate pushes, no sponsored content, unsubscribe anytime.
Medical disclaimer. This page is educational and does not replace advice from a qualified healthcare provider. Individual needs and risks vary — consult a professional before starting, stopping, or combining supplements, especially if you are pregnant or nursing, taking medication, or managing a health condition.