The rule does allow manufacturers to rely on certificates of analysis to verify the identity specifications for components other than dietary ingredients. Additionally, the certificate of analysis can be used to verify compliance to other established specifications for components. However, in order to use a COA as an alternative to conducting your own tests and examinations to verify component specifications, you must establish the reliability of the COA by confirming supplier tests or examinations. The COA must describe the test or examination method used, test or examination limits, and provide actual tests or examination results. Additionally, you must maintain documentation regarding how you qualify the supplier and periodically re-confirm the supplier’s COA, and your quality control personnel must review and approve the documentation setting forth the basis for qualification and re-qualification of any supplier. (21 CFR 111.75)