"freeze dried" "Freeze drying is a water removal process typically used to preserve perishable materials, to extend shelf life or make the material more conven

"freeze dried" "Freeze drying is a water removal process typically used to preserve perishable materials, to extend shelf life or make the material more convenient for transport. Freeze drying works by freezing the material, then reducing the pressure and adding heat to allow the frozen water in the material to sublimate." You freeze it or shock freeze it and then "distill" the water of in vacuum. The ice goes into the vapor phase, skipping the liquid phase. This process is called sublimation and part of each first year high school chemistry curriculum. The substance, insulin or other peptides, will be stable after this at room temperature for some time.