Comparison
C-Plex and Ultra-C
C-Plex (Karuna) lists 3 distinct ingredients and Ultra-C (Douglas Laboratories) 3 (rows of one ingredient counted once); 3 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 1.00: the same ingredients, at the amounts in the table below.
| Ingredient | C-Plex | Ultra-C |
|---|---|---|
| Vitamin C | 500 mg (556%) | 300 mg (333%) |
| Flavonoid | 250 mg | 300 mg |
| Rutin | 50 mg | 50 mg |
Amounts are per serving as DSLD gives them: C-Plex, 1 capsule; Ultra-C, 1 capsule. Current labels entered February 2025 and June 2012. Percentages of the Daily Value from 21 CFR 101.9. Source: NIH ODS Dietary Supplement Label Database.