Quercetin

Immune

Polyphenol with antihistamine and senolytic properties. Common in protocols for allergies and viral infections; pair with vitamin C.

antihistaminesenolyticimmunepolyphenol

Typical dose

500–1000 mg daily

Evidence

Moderate (some RCTs)

Onset time

Cumulative: 2–6 weeks

Half-life

~17 hours

Forms

Capsule, Tablet

Source

plant

Best taken with

vitamin C (potentiates)

Best time of day

any

Bioavailability

2/5

Safety rating

4/5

Price per serving

$0.35

Vegan / GF / 3rd-party

✓ / ✓ / ✓

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Common uses

• Seasonal allergies
• Immune support
• Senescent cell clearance

Effect profile

Strength

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Common side effects

• Headache
• Tingling extremities (high doses)

Avoid if

• Kidney disease

Drug interactions

• Cyclosporine
• Quinolone antibiotics
• Anticoagulants

Related immune supplements

Quercetin vs NAC (N-Acetyl Cysteine)

Medical disclaimer

SupplementDuel is for educational purposes only and is not medical advice. Consult a physician before starting, stopping, or combining supplements.