About Verified Supplement Data

What We Do

Verified Supplement Data is an evidence-based supplement comparison database. We answer the question that no single source currently answers well: "What specific supplement product should I buy for my condition, at what dose, based on actual clinical evidence, and what will it cost me per day?"

To answer that, we chain together four data layers that are typically siloed across different sources:

1. Clinical evidence from PubMed systematic reviews and meta-analyses — what ingredient, at what dose, for what condition, based on what quality of evidence
2. Product label data from the NIH Dietary Supplement Label Database (DSLD) — which specific products contain the right form at the right dose
3. Quality verification from NSF International and USP — which products have been independently tested
4. Cost normalization calculated per clinically-effective daily dose — not per pill, not per serving, but per the amount actually studied in trials

Why We Built This

The supplement market exceeds $206 billion, and consumers are overwhelmed. Product labels are confusing (elemental magnesium vs. compound weight, for example). Prices vary 10x across equivalent products. Quality verification is scattered across multiple databases. And clinical evidence is locked in academic journals that most consumers never read.

We believe this information should be free, structured, transparent, and easy to access — whether you're reading it yourself or an AI assistant is answering your question.

Editorial Standards

• All clinical claims link directly to their PubMed source (PMID)
• Product data is verified against the NIH DSLD where available
• Rankings are determined by cost per effective dose — we do not accept payment for placement
• We distinguish evidence levels: systematic review > meta-analysis > individual RCT > observational
• We qualify claims appropriately — where evidence is mixed or limited, we say so
• Pages include affiliate links to fund the project; this does not influence rankings

For full details, see our Methodology page.

Data Sources

• NIH DSLD (dsld.od.nih.gov) — 207,000+ supplement labels with verified ingredient data
• PubMed / NCBI (pubmed.ncbi.nlm.nih.gov) — Systematic reviews, meta-analyses, and RCTs
• NSF International (nsf.org) — Certified for Sport and dietary supplement certifications
• USP (usp.org) — United States Pharmacopeia Verified program
• Amazon and brand websites — Current retail pricing

Health Content Disclaimer

This site provides health information based on published clinical research. It is not medical advice and does not substitute for professional medical consultation. Always consult a qualified healthcare provider before starting, stopping, or changing any supplement regimen — especially if you take medications, have kidney disease, or are pregnant or nursing.

We do not conduct our own laboratory testing. Product quality claims are based on third-party certifications (USP, NSF) and manufacturer-submitted label data in the NIH DSLD.

Contact

Questions about our data or methodology? Email us at [email protected].