What is lyophilization (and why are peptides freeze-dried)?
Updated October 2026
Nearly every research peptide arrives as a dry powder for one reason: stability. Here's the science of why.
What lyophilization is
Lyophilization — freeze-drying — removes water from a frozen solution under vacuum, turning the ice directly to vapor (sublimation). What's left is a dry, porous cake of peptide with almost no residual moisture.
Why it's used for peptides
Water is what lets peptides degrade — through hydrolysis, oxidation, and microbial growth. Removing it dramatically extends shelf life. A lyophilized peptide stored cold and dark can remain stable far longer than the same peptide in solution, which is why it's shipped dry and reconstituted only when needed.
What it means for you
- The powder may look like a small puck, film, or be nearly invisible — all normal
- Reconstitute gently; don't blast the solvent directly onto the cake
- Once reconstituted, the stability clock starts — store cold and use within the compound's window
Research-grade in the catalog