Quercetin 300, 60 Capsules
60 Capsules
May be a fit for
- Adults seeking quercetin to support seasonal immune comfort
- Individuals using quercetin to help maintain healthy histamine balance
- Practitioners protocols requiring a standalone 300mg quercetin capsule
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Quercetin 300 by Allergy Research Group delivers 300 mg of quercetin per capsule, a bioflavonoid found naturally in fruits and vegetables that supports healthy immune and inflammatory response. Formulated for individuals seeking a straightforward, well-dosed quercetin supplement without unnecessary fillers.
Why It's Worth Considering: Allergy Research Group is a practitioner-trusted brand with a longstanding focus on purity and hypoallergenic formulation standards, making this a reliable option for sensitive individuals. Each capsule provides a clinically relevant dose in a clean, capsule-based delivery format.
Allergy Research Group · 60 CapsulesMake it part of your routine.
As a dietary supplement, 1 or 2 capsules one to three times daily with meals, or as directed by a health practitioner.
Important cautions & interactions
WARNING: Consuming this product can expose you to lead, a chemical known to the State of California to cause birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov/food
Product details
Supplement facts & complete label
Serving Size:
2 Capsules
Amount Per Serving:
Vitamin C (as Ascorbic Acid) ... 150 mg
Vitamin E (as 140 IU d-alpha-Tocopheryl Acetate) ... 93.8 mg
Quercetin Dihydrate ... 600 mg
Other Ingredients:
Hydroxypropyl methylcellulose, microcrystalline cellulose, silicon dioxide, L-leucine.
Other Ingredients: Hydroxypropyl methylcellulose, microcrystalline cellulose, silicon dioxide, L-leucine.
Label directions
As a dietary supplement, 1 or 2 capsules one to three times daily with meals, or as directed by a health practitioner.
Label cautions
Keep in a cool, dry place, tightly capped.
WARNING: Consuming this product can expose you to lead, a chemical known to the State of California to cause birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov/food
Source: authorized supplier original manufacturer label · September 06, 2026. Formulas and labels can change. Check the packaging you receive.
Who it may suit
May be a fit for
- Adults seeking quercetin to support seasonal immune comfort
- Individuals using quercetin to help maintain healthy histamine balance
- Practitioners protocols requiring a standalone 300mg quercetin capsule
- Those supporting antioxidant defenses with a flavonoid-focused compound
Considerations
- Taking cyclosporine (quercetin increases blood levels)
- Taking fluoroquinolone antibiotics (quercetin may interfere)
- Kidney disease (high doses may contribute to oxalate stones)
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A few useful answers.
Research & further reading
More category questions
Does quercetin help with allergies?
Yes. Quercetin stabilizes mast cells, preventing them from releasing histamine in response to allergens. Clinical studies show 500-1000mg/day reduces allergy symptoms (sneezing, itching, congestion) comparably to some antihistamine drugs. Start 2-4 weeks before allergy season for preventive benefit.
How much quercetin should I take?
For allergies: 500mg 2x/day starting 2-4 weeks before allergy season. For immune support: 500-1000mg/day. For longevity/senolytic effect: 500mg with dasatinib (under practitioner guidance). Standard quercetin has low bioavailability — choose quercetin phytosome or EMIQ (enzymatically modified isoquercitrin) for 20x better absorption.
Is quercetin a senolytic?
Yes — quercetin is one of the most studied senolytic compounds (agents that clear senescent 'zombie' cells). In combination with dasatinib, it's been shown to reduce senescent cell burden in human trials. As a standalone supplement at 500-1000mg/day, it has milder senolytic activity but still contributes to healthy aging through reduced inflammation and oxidative stress.
Supplement information is provided for education and is not a substitute for personalized medical advice. Supplements are not intended to diagnose, treat, cure or prevent disease. Read the current product label before use.