How USP Verifies Dietary Supplements

USP conducts a rigorous process of tests and reviews before awarding the USP Verified Mark to a dietary supplement that a manufacturer voluntarily submits for verification. The process includes the following steps:

  • Experienced USP scientists test supplement products to ensure that they meet USP standards for quality, purity, and potency.
  • USP audits the supplement manufacturer's facilities, practices, records, and quality control measures.
  • USP tests marketplace samples of verified products to ensure that they continue to retain ingredient strength and stability over their shelf life.
  • USP reviews supplement labels to ensure that the ingredients are properly listed and that appropriate dosage information and warnings/cautions/counterindications are featured.