Comparison
Prim Royal-V Standardized Herbal Extract and Evening Primrose Oil 500 mg
Prim Royal-V Standardized Herbal Extract (Douglas Laboratories) lists 3 distinct ingredients and Evening Primrose Oil 500 mg (Thompson) 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 | Prim Royal-V Standardized Herbal Extract | Evening Primrose Oil 500 mg |
|---|---|---|
| Linoleic Acid | 225 mg | not disclosed |
| Gamma Linolenic Acid | 30 mg | not disclosed |
| Evening Primrose oil | 500 mg | 500 mg |
Amounts are per serving as DSLD gives them: Prim Royal-V Standardized Herbal Extract, 1 vegetarian capsule; Evening Primrose Oil 500 mg, 1 softgel. Current labels entered June 2012 and August 2014. Percentages of the Daily Value from 21 CFR 101.9. Source: NIH ODS Dietary Supplement Label Database.
Each product on its own
- Prim Royal-V Standardized Herbal ExtractDouglas Laboratories: every row against all products listing it
- Evening Primrose Oil 500 mgThompson: every row against all products listing it