Read the source. Keep the context.
Supplement comparisons
We organize factual ingredient declarations, serving sizes and units from US product sources. Each product identifies its source and observation date. Product groups help browsing; they are not efficacy or quality rankings.
NIH reference library
The library contains historical reference label versions from the National Institutes of Health, Office of Dietary Supplements, Dietary Supplement Label Database. The DSLD API identifies its license as CC0. Attribution does not imply NIH endorsement. Label entries in this snapshot run through September 25, 2025; only a subset has full amounts stored here.
What comparison means
Similar ingredient names, different chemical forms, blend totals and nested components are not automatically merged. Missing quantities are unknown, not zero. A historical record does not verify current formulation, availability, efficacy, safety or a manufacturing batch. Check the current label before use.
Sources and corrections
Retailer observations were collected September 25–26, 2026 UTC. Original source links and dates remain visible. Retailer images, descriptive copy and historical listing archives are not published in this release. Reference label versions can overlap and must not be counted as unique products.
For an apparent discrepancy, compare the cited source and collection date with your current product label. The manufacturer or original provider is the authority for current labeling.
Funding and privacy
No affiliate links or advertising are active. Source links are ordinary links. If affiliate links are added, we will disclose them before enabling commission tracking. We do not request accounts or health information.