Skip to content
S
SuppUp
Stack
LibraryInteractions
Sign in
Moderate Evidence🛡️

Best Quercetin for Immunity in Australia

Potent flavonoid antioxidant found in onions, apples, and berries. Supports immune function, reduces inflammation, and has natural antihistamine properties. Compare prices across Australian retailers and find the best value.

Full Quercetin profile — evidence, interactions & all conditions

Quick Summary

Dosage

500-1000 mg/day

Time to Effect

2-4 weeks

From

$0.12/serve

Evidence

moderate (4/5)

Timing: Take with vitamin C for enhanced absorption. Best taken with meals.

Clinical Evidence

Quercetin reduces illness but not immune perturbations after intensive exercise

PMID: 17136005
RCT2007n=40

Quercetin 1000mg/day for 3 weeks significantly reduced upper respiratory tract infections (1 of 20 vs 9 of 20 in placebo) in trained athletes.

How Does Quercetin Help with Immunity?

Stabilises mast cells to reduce histamine release. Inhibits inflammatory enzymes (COX-2, lipoxygenase). Acts as a zinc ionophore, helping zinc enter cells to support immune function.

Natural antihistamine and zinc ionophore. Pairs well with zinc for immune support. May reduce allergy symptoms.

This link is supported by 1 clinical study, with the evidence rated as moderate overall. With an effectiveness rating of 4/5, Quercetin is one of the top-rated supplements for immunity.

Best Prices in Australia

BulkSupplements Quercetin Powder

BulkSupplementsviaBulkSupplements

500mg per serve · 200 serves · Powder

$0.12/serve

$24.90 total

Buy
2

NOW Quercetin with Bromelain

NOW FoodsviaiHerb

500mg quercetin per serve · 120 serves · Capsule

$0.24/serve

$28.90 total

Buy
3

Life Extension Bio-Quercetin

Life ExtensionviaLife Extension

150mg phytosome per serve · 60 serves · Capsule

$0.37/serve

$22.00 total

Buy
4

Thorne Quercetin Phytosome

ThorneviaThorne

250mg phytosome per serve · 60 serves · Capsule

$0.63/serve

$38.00 total

Buy

Interactions to Watch

  • Cyclosporinemoderate— Quercetin may increase cyclosporine levels by inhibiting CYP3A4 and P-glycoprotein.
  • Antibiotics (fluoroquinolones)moderate— Quercetin may compete with fluoroquinolone antibiotics for DNA gyrase binding.
Check all interactions

Other Supplements for Immunity

Vitamin C

strong evidence

Vitamin D

strong evidence

Zinc

strong evidence

Elderberry

moderate evidence

NAC (N-Acetyl Cysteine)

moderate evidence

Lions Mane

preliminary evidence

View complete Immunity supplement guide

Frequently Asked Questions

How much Quercetin should I take for immunity?
The recommended dose of Quercetin for immunity is 500-1000 mg per day. Natural antihistamine and zinc ionophore. Pairs well with zinc for immune support. May reduce allergy symptoms. Always consult a healthcare professional before starting supplementation.
When is the best time to take Quercetin for immunity?
Take with vitamin C for enhanced absorption. Best taken with meals.. Consistency matters more than exact timing — take it at the same time each day for best results.
How long does Quercetin take to work for immunity?
Most people notice effects within 2-4 weeks. Individual results vary depending on baseline levels, dosage, and overall health. Consistent daily use is important — don't expect overnight results.
What form of Quercetin is best for immunity?
Quercetin is available as Capsule, Tablet, Powder. Choose the form that fits best into your daily routine for consistent use.
Where can I buy Quercetin for immunity in Australia?
You can buy Quercetin from BulkSupplements, iHerb, Life Extension, Thorne in Australia. The best value we found is BulkSupplements Quercetin Powder at $0.12 per serve from BulkSupplements.
Is Quercetin safe? Are there any interactions?
Quercetin is generally considered safe at recommended doses. However, it can interact with Cyclosporine, Antibiotics (fluoroquinolones). Always check with your doctor if you take medications, especially before combining supplements.

Get a Full Immunity Stack

Quercetin is just one piece. Our AI builds a complete supplement stack tailored to your immunity goals, with dosages and prices.

Get My Immunity Stack

This information is for educational purposes only and is not medical advice. Consult a healthcare professional before starting any supplement regimen. SuppUp earns affiliate commissions from qualifying purchases — this does not affect our recommendations.