Do Michigan cosmetic contract manufacturers need to be GMP certified?

FDA does not mandate GMP certification for cosmetics under current US law, but ISO 22716 (Good Manufacturing Practices for Cosmetics) is the industry standard and is required by most major retailers and by EU and Canadian regulations. Any serious Michigan contract manufacturer should be able to provide documentation of their GMP practices. AJ Cosmo Labs vets listed manufacturers before they appear on the platform, which reduces the risk of working with non-compliant facilities.