The GMP Certification Program is developed to verify compliance of suppliers of dietary supplements with a standardized set of good manufacturing practices (GMPs) developed by NNFA. This program is based upon third party inspections of member suppliers and comprehensive audits of their GMP programs in the areas of Personnel, Plant and Grounds, Sanitation, Equipment, Quality Operations, Production and Process Controls, and Warehouse, Distribution, and Post-Distribution Practices. This program ensures that all elements of the manufacturing process are reviewed to provide reasonable assurance that processes are sufficiently controlled so that compounds meet their purported quality.

Member suppliers that meet minimum NNFA GMPs standards and have received an "A" compliance rating after an NNFA GMP audit will be entitled to apply for certification and use of the NNFA GMP certification mark. NNFA certification and display of the GMP certification mark demonstrate to retailers, consumers and the public-at-large that compounds have been manufactured using good manufacturing practices and bring a means of self-assessment to the dietary supplement industry.