Not medical advice · Not affiliated with any certification program
Supplement Seal Check

What “third-party tested” actually means

Independent organizations offer quality testing and let passing products show a seal. ODS says such a seal means the product was properly made, contains what the label lists, and lacks harmful contaminant levels. [1]

What a seal does not mean

ODS says these seals do not guarantee a product is safe or effective. [1]

Different programs, different goals

NSF Certified for Sport focuses on banned substances for athletes plus label and contaminant checks. [2]

USP Verified covers label accuracy, specified contaminants, GMP and dissolution. [3]

Sources

  1. NIH Office of Dietary Supplements — Dietary Supplements: What You Need to Know retrieved 2026-10-27
  2. NSF — About Certified for Sport retrieved 2026-10-27
  3. USP — USP Verified Mark retrieved 2026-10-27