# What is NSF Certified for Sport?

> NSF Certified for Sport is a supplement certification that screens products for substances banned in sport, confirms label contents and audits manufactu...

- **URL**: https://www.best-proteinpowder.com/glossary/nsf-certified-for-sport/
- **Publisher**: [Best Protein Powder](https://www.best-proteinpowder.com/)

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NSF Certified for Sport is a supplement certification that screens products for substances banned in sport, confirms label contents and audits manufacturing facilities.

**How we rank:** Certification has several parts. NSF says products are tested for close to 300 substances banned in sport, based on lists such as the World Anti-Doping Agency's. NSF also confirms that what is on the label is in the product, screens for contaminants such as heavy metals, reviews the formula and label, and inspects production facilities and suppliers. Certified products are tested on a lot-by-lot basis and monitored over time.