How Long Does Retatrutide Last in the Fridge? What Research Shows
The retatrutide obesity trial studied weekly treatment, not refrigerator shelf life. See what the phase 2 paper and study registry do and do not establish.
FormBlends Editorial Research · Updated 2026-10-04
Retatrutide is investigational and is not FDA-approved. FDA states that it cannot be used in compounding under federal law. FormBlends does not prescribe, compound or sell retatrutide.
Direct answer
The public phase 2 paper and registered study cited here do not specify a refrigerator shelf life for routine storage, a beyond-use date, or a usable period after preparation. They report study interventions and outcomes, not consumer product storage instructions. A specific number of days cannot be derived from these sources.
What the published research can answer
The phase 2 study compared weekly retatrutide regimens and reported weight and safety outcomes over the study period. Its reported treatment schedule is not a stability study. The paper and registry page do not establish how long a separate product remains usable in a refrigerator before or after preparation.
| Question | What the cited public source establishes |
|---|---|
| Was retatrutide studied weekly? | Yes. The phase 2 obesity trial evaluated assigned once-weekly study regimens. |
| Does that trial report a consumer refrigerator life in days? | The cited paper does not give a consumer storage period. |
| Does the study set a beyond-use date after preparation? | The linked publication and public registry do not establish one. |
| Can a storage period for another peptide or formulation supply the missing result? | No. Stability depends on the specific substance, formulation, container, preparation, and tested conditions. |
Why trial dosing does not answer a storage question
A trial's weekly schedule describes when study participants received assigned treatment. It does not measure degradation over time under household refrigerator conditions. Likewise, an expiration date or beyond-use date from a different product cannot be treated as a retatrutide stability result.