# How Compounded Tirzepatide Is Prepared

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Compounded Peptides · 2026-01-03


    Legitimate compounded tirzepatide is prepared in a sterile compounding environment using USP Chapter <797> or <800> compliant procedures. The active pharmaceutical ingredient (API) tirzepatide is reconstituted in sterile water for injection or bacteriostatic water, with formulation additives such as sodium phosphate buffers and tonicity agents. Filtration, aseptic filling, and sealing occur within ISO Class 5 primary engineering controls. Stability and sterility testing are performed prior to release. Less-rigorous preparations — including some that have been the subject of FDA warning letters — skip sterility validation or use API from unregistered foreign suppliers, which represents a core quality concern in the compounded GLP-1 space.


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