Ultimate Respiratory Defense with NAC and Quercetin
Scored by the Formulate Research Team · Last reviewed July 2026
Score Breakdown
Three factors carry this score; three more are checked separately and can only take points away. Hover or tap to see what drove each one.
Ingredients per Serving
Certifications & Testing
Other Ingredients
Hypromellose, Rice Bran, Magnesium Stearate, Silica
Recommended Use
Suggested use: as a dietary supplement, take one veggie capsule per day with water or as recommended by your healthcare provider.
Warnings
Warning: for adults only. Keep out of reach of children. Do not take this product if you are pregnant or nursing. Consult your healthcare provider before use if you are taking any prescription medication or if you have a medical condition. Discontinue use if you experience gastrointestinal discomfort. Do not use if seal is broken.
Frequently Asked Questions
What is Swanson Ultimate Respiratory Defense with NAC and Quercetin's Formulate score?
Swanson Ultimate Respiratory Defense with NAC and Quercetin scores 84 out of 100 (grade A-) on Formulate's ingredient-level rubric: clinical evidence, dose accuracy and bioavailability carry the score, while manufacturing, transparency and safety are checked separately and can only deduct.
Is Swanson Ultimate Respiratory Defense with NAC and Quercetin worth it?
Swanson Ultimate Respiratory Defense with NAC and Quercetin scores 84/100 (grade A-). That puts it in Formulate's top tier: its ingredient doses, forms, and label transparency hold up against the clinical evidence, and it carries credible third-party testing. Formulate grades every product with the same automated rubric, so the score reflects the formula — not marketing or sponsorships.
What's in Swanson Ultimate Respiratory Defense with NAC and Quercetin?
Each serving contains N-Acetyl Cysteine (600 mg), Quercetin (300 mg). Serving size: 1 Veggie Capsule(s). 60 servings per container.
How do I take ultimate respiratory defense with nac and quercetin?
Suggested use: as a dietary supplement, take one veggie capsule per day with water or as recommended by your healthcare provider.
Who makes Ultimate Respiratory Defense with NAC and Quercetin?
Ultimate Respiratory Defense with NAC and Quercetin is made by Swanson. See Formulate's full grade and product lineup for Swanson on its brand page.
Is Swanson Ultimate Respiratory Defense with NAC and Quercetin third-party tested?
Swanson lists the following certifications and testing for this product: Vegetarian.
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Disclosure. Formulate may earn a commission from purchases made through links on this page. Commissions never influence scores — every product is graded by the same automated rubric. This page is for educational purposes only and does not replace advice from a qualified healthcare provider.