Comparison
Ultimate Respiratory Defense and NAC 1,000 mg Quercetin 500 mg & Zinc 15 mg
Ultimate Respiratory Defense (Swanson) lists 2 distinct ingredients and NAC 1,000 mg Quercetin 500 mg & Zinc 15 mg (NOW) 3 (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 | Ultimate Respiratory Defense | NAC 1,000 mg Quercetin 500 mg & Zinc 15 mg |
|---|---|---|
| Quercetin | 300 mg | 500 mg |
| N-Acetyl Cysteine | 600 mg | 1,000 mg |
| Zinc | 15 mg (136%) |
Amounts are per serving as DSLD gives them: Ultimate Respiratory Defense, 1 veggie capsule; NAC 1,000 mg Quercetin 500 mg & Zinc 15 mg, 2 veg capsules. Current labels entered February 2025 and December 2023. Percentages of the Daily Value from 21 CFR 101.9. Source: NIH ODS Dietary Supplement Label Database.
Each product on its own
- Ultimate Respiratory DefenseSwanson: every row against all products listing it
- NAC 1,000 mg Quercetin 500 mg & Zinc 15 mgNOW: every row against all products listing it