Source comparison
Reconstituted vs Lyophilised: Storage Requirements Differ
Lyophilised tesamorelin (the freeze-dried powder form) tolerates storage conditions better than reconstituted solution, but 'better' is relative. Unopened lyophilised vials stored at 2–8°C maintain potency for 18–24 months from manufacture date. Once opened an
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- Lyophilised tesamorelin (the freeze-dried powder form) tolerates storage conditions better than reconstituted solution, but 'better' is relative. Unopened lyophilised vials stored at 2–8°C maintain potency for 18–24 months from manufacture date. Once opened and reconstituted with bacteriostatic water, the clock accelerates. Reconstituted tesamorelin must be refrigerated at 2–8°C and used within 28 days. This isn't a conservative guideline, it's the outer stability limit.
- The difference comes down to water activity. Lyophilised peptides exist in a low-moisture crystalline state where molecular motion is minimal. Hydrolysis, oxidation, and microbial growth all require water. Reconstitution reintroduces water, which simultaneously restores biological activity and creates the conditions for degradation. Bacteriostatic water (typically 0.9% benzyl alcohol) inhibits bacterial growth but does nothing to slow peptide degradation. It only prevents contamination.
- Our experience working with research-grade peptides across diverse laboratory protocols has shown that reconstituted peptides are the most vulnerable stage. Even with perfect refrigeration at 4°C, you're working against chemistry. After 28 days, oxidation and aggregation reduce potency measurably. After 45 days, even refrigerated reconstituted tesamorelin may be 70% or less of its labeled potency. Researchers sometimes ask if freezing reconstituted solution extends stability. It doesn't. Freeze-thaw cycles cause ice crystal formation that physically tears peptide chains and creates aggregates that can't be reversed.