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Flavonoid

Quercetin (Immune)

Also known as: Quercetin dihydrate, Isoquercetin, Quercetin phytosome

B
Evidence

Flavonoid with broad antiviral activity, zinc ionophore function, and anti-inflammatory properties.

Last reviewed June 2026 · Evidence graded from peer-reviewed research, not editorial opinion. Educational only — not medical advice.

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Primary uses

  • Antiviral
  • Anti-inflammatory
  • Zinc ionophore
  • Allergy relief

How it works

  • Helps zinc enter cells (ionophore)
  • Inhibits viral replication enzymes
  • Anti-inflammatory effects
  • Mast cell stabilization

Dosage

Typical range
500-1000mg 2-3x daily
Timing
With meals and zinc
With food
Yes, enhances absorption
Duration
During illness or ongoing for allergies
Special populations
Those seeking antiviral or allergy support

Forms

  • Quercetin phytosome
  • Quercetin dihydrate
  • Isoquercetin
  • With bromelain

Safety

Common side effects

  • GI upset
  • Headache

Contraindications

  • Kidney disease (high doses)

Products containing Quercetin (Immune)

Top-scoring supplements in our catalog that list Quercetin (Immune) on the label. Each product is graded on Formulate's ingredient-level rubric — dose accuracy, form, transparency, and third-party testing.

Thorne
Quercetin Phytosome
92
Thorne
Quercetin Complex
90
Thorne
Advanced Nutrients
88
Thorne
Pre-Workout Elite
88
See all products →

Evidence notes

Promising research for viral infections

Grade B: Some human trials support key claims; further confirmation needed.

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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.