Comparison
NAC 1,000 mg Quercetin 500 mg & Zinc 15 mg and Ultimate Respiratory Defense
NAC 1,000 mg Quercetin 500 mg & Zinc 15 mg (NOW) lists 3 distinct ingredients and Ultimate Respiratory Defense (Swanson) 2 (rows of one ingredient counted once); 2 are on both labels. On the site's similarity measure, which compares ingredient lists (1 for the same list, rarer ingredients counting for more; amounts are not part of it), the two formulas score 0.79.
| Ingredient | NAC 1,000 mg Quercetin 500 mg & Zinc 15 mg | Ultimate Respiratory Defense |
|---|---|---|
| Quercetin | 500 mg | 300 mg |
| N-Acetyl Cysteine | 1,000 mg | 600 mg |
| Zinc | 15 mg (136%) |
Amounts are per serving as DSLD gives them: NAC 1,000 mg Quercetin 500 mg & Zinc 15 mg, 2 veg capsules; Ultimate Respiratory Defense, 1 veggie capsule. Current labels entered December 2023 and February 2025. Percentages of the Daily Value from 21 CFR 101.9. Source: NIH ODS Dietary Supplement Label Database.
Each product on its own
- NAC 1,000 mg Quercetin 500 mg & Zinc 15 mgNOW: every row against all products listing it
- Ultimate Respiratory DefenseSwanson: every row against all products listing it