Side-by-side comparison
Compare two supplements, brands, or ingredients
Pick any two products, manufacturers, or ingredients and see their label-declared attributes lined up in one table, drawn directly from the NIH Dietary Supplement Label Database, not marketing copy.
According to the National Institutes of Health Office of Dietary Supplements, the Dietary Supplement Label Database (DSLD) catalogs 113,539 product labels as of April 2026. Every comparison below is computed from those filings at build time, no editorial weighting, no paid placement. How we compile this data.
Start your own comparison
Open any supplement, brand, or ingredient page and use its compare tool to line it up against a peer, or jump into one of the ready-made matchups below.
Popular brand matchups
The largest supplement manufacturers in the database, head to head by catalog size and active-product share.
- BulkSupplements.com vs NOW 4,324 vs 3,516 products
- Douglas Laboratories vs Herb Pharm 2,177 vs 1,755 products
- Nature's Way vs Carlson 1,749 vs 1,587 products
- Herbal Terra vs Jarrow Formulas 1,564 vs 1,517 products
- The Vitamin Shoppe vs Solgar 1,363 vs 1,035 products
- Bluebonnet vs Country Life 965 vs 965 products
Common ingredient matchups
The most-listed active ingredients across the catalog, compared by how many products contain each.
How comparisons work
Each comparison reads the two entities' records directly from the NIH DSLD and lines up their shared attributes. The database records what manufacturers print on labels, not independent laboratory testing, and a brand's catalog here reflects the filings on record rather than its full historical SKU count. Comparisons are informational only and not medical advice, see our health & appropriate-use disclaimer.
Every figure on PlainVitamins is rendered directly from the NIH Dietary Supplement Label Database (DSLD), no number is typed in by an editor. This page draws directly on the NIH DSLD, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.