Verified Supplement Data

About Verified Supplement Data

Verified Supplement Data compares supplements on what you can check: the dose on the label, whether an independent tester lists the product, recalls, and the cost of the dose studied in trials. No brand pays us for a pick.

By Erin Rose Updated October 11, 2026 How we score

Who runs this site and how pages are made

Erin Rose

Verified Supplement Data is run by Erin Rose, a healthcare-data engineer. We use software, including AI tools, to collect supplement labels, testing-registry listings and prices, and to draft pages. Erin sets the rules we use to score and pick products and reviews new pages before they go live. Some changes run automatically under those rules: prices update daily from Amazon, and when a product stops selling we swap in the next product the rules allow.

We are not doctors or dietitians, and nothing on this site is medical advice. If you find a mistake, tell us. We fix it and log it on our corrections page.

How a page gets made

  1. Read the label

    We record the dose per serving from the NIH label database and the product’s own label.

    Supplement Facts panel from a Thorne Creatine tub

  2. Check the testers’ lists

    A seal on a bottle is the brand’s claim. We look for that exact product in the tester’s own public list and link to it.

    Testing seals printed on a Sports Research Collagen Peptides bag

  3. Score five checks

    Dose, testing, cost per dose, label clarity and recalls give each product a score from 0 to 10.

    See the rules →

  4. Pick and explain

    The buying guide names a pick, says why, and shows its sources.

    See what we have fixed →

“Tested” on our pages means the exact product is in a certifier’s public list (NSF, USP, Informed Choice, Informed Sport or, for fish oil, IFOS), or the brand publishes a lab report for that batch.

How we make money

We earn a commission when you buy through our Amazon links. As an Amazon Associate, we earn from qualifying purchases. It does not change your price. No brand pays us for a ranking, a pick or a review. More on how we stay independent.

Where our data comes from

  • Labels: the NIH Dietary Supplement Label Database and the product’s own label.
  • Research: PubMed, usually reviews that pool many trials.
  • Testing: the public lists of NSF, USP, Informed Choice, Informed Sport and IFOS. See our tested database.
  • Recalls: FDA recall records.
  • Who is low in a nutrient: CDC NHANES blood test data. See our deficiency stats.
  • Prices: Amazon and brand websites.

Our data is free to reuse under CC BY 4.0. See our open dataset.

Contact

Questions about our data or a page? Email [email protected]. Press and researchers can use our media kit.