“Certified for Sport®” is the gold standard certification granted by the NSF—a 75-year-old independent global organization that exists to protect public human health and safety. They perform tests and develop standards to help educate consumers on which health-related products are safe for consumption. When you choose a product that’s certified by the NSF, you can rest assured that the company producing that product is complying with the NSF’s strict guidelines on safety, quality and purity.