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What Is Third-Party Certification?

Third-party certification means that an independent organisation has reviewed the manufacturing process of a product and has independently determined that the final product complies with specific standards for safety, quality or performance.

This review typically includes comprehensive formulation/material reviews, testing and facility inspections. Most certified products bear the certifier’s mark on their packaging to help consumers and other buyers make educated purchasing decisions. Ours is the NSF mark.

NSF Certification

Recognised by regulatory agencies at the local, state, federal and international levels, NSF certification demonstrates that a product or service complies with all standard requirements. NSF conducts periodic facility audits and product testing to verify that the product continues to comply with the standard.

NSF tests and certifies a wide variety of products including food, drinking water treatment products and water filters, commercial foodservice equipment, bottled water and nutritional supplements.

Why Do Companies Seek NSF Certification?

Our 75 years of experience providing independent, third-party testing and certification helps organisations:

  • Demonstrate compliance with national or international standards and regulations
  • Demonstrate independent validation and verification of their commitment to safety and quality
  • Increase credibility and acceptance with retailers, consumers and regulators

The NSF Mark

The NSF mark is your assurance that a product has been tested by a trusted independent certification organisation.
Learn more about the mark

NSF Product Listings

Search for companies whose products and systems have been certified by NSF.
Search certified products

How NSF Can Help You

Get in touch to find out how we can help you and your business thrive.

What’s New with NSF

  • iNADO Partners with NSF to Support Members and Athletes

    May 27, 2026
    iNADO is pleased to welcome NSF’s expertise and experience in support of its members and the athletes they serve
    Read the Story
  • NSF Ends UK’s Three-Year Testing Gap with REG 31 Testing Designation

    May 20, 2026
    NSF’s Oakdale laboratory becomes the UK’s sole facility offering comprehensive BS 6920 and REG 31 testing, closing a critical drinking water safety gap.
    Read the Story
  • NSF Annual Review and Impact Report 2025 Now Live

    April 20, 2026
    NSF has published its Annual Review and Impact Report 2025, detailing the organization’s progress over the past year and outlining strategic priorities for 2026.
    Read the Story
  • Visit NSF at Making Pharma 2026

    April 10, 2026
    Connect with our experts to discover how we help leading pharmaceutical and biotechnology companies achieve regulatory compliance and operational excellence.
    Read the Story