The NSF (National Sanitation Foundation) is a certifier for GMP. Through the NSF, Lief Labs can verify that your product has the identity, strength, composition, quality and purity that appear on the label. NSF/ANSI 455-2 is an American National Standards Institute (ANSI) accredited public standard developed in consensus by manufacturers, retailers, public health regulators and certification bodies. NSF/ANSI 455-2 is recognized by the Global Retailer and Manufacturer Alliance (GRMA) and is widely accepted in global markets.