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Zing Brothers LLC received a warning letter for manufacturing adulterated dietary supplements in violation of Current Good Manufacturing Practice (CGMP) regulations. FDA inspectors found that the company failed to establish proper specifications for manufacturing control points and component identity, purity, strength, and composition limits as required by 21 CFR Part 111. The facility located in Salt Lake City, Utah was inspected in August 2022, and the company did not respond to the FDA 483 inspectional observations issued during that inspection.