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Third-party tested supplements: what it means

verdavita editorial team · 2026-11-05

A seal from an independent organization can indicate proper manufacturing, listed ingredients and no harmful contaminant levels. The NIH says it does not guarantee a product is safe or effective.

What a seal can tell you

The NIH says several independent organizations offer quality testing, and products that pass can display a seal. It names ConsumerLab.com, NSF International and U.S. Pharmacopeia as examples, without endorsing them.

A seal indicatesA seal does not guaranteeProperly manufacturedContains the listed ingredientsNo harmful levels of contaminantsThat the product is safeThat the product is effective
Based on the NIH consumer fact sheet on dietary supplements.

How to check a claim

  • Look for the name of the organization, not only the word “tested”.
  • Ask the seller which lab did the testing and which batch it covers.
  • Check whether a report exists for the product you are buying.

Where we stand

We do not claim third-party testing right now, because we do not hold the documents. See The Receipts for what we can and cannot prove.

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Sources

General information, not medical advice. Images are illustrative.

†These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.

* Individual results may vary. Reviews reflect the experiences of individual customers.

Consult your healthcare provider before starting any supplement, especially if you are pregnant, nursing, taking medication or have a medical condition.