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Lyophilization, also known as cryodesiccation, is a dehydration process where peptides are frozen and subjected to low pressure. This method causes the water in the peptide vial to sublimate directly from a solid to a gas, leaving behind a stable, crystalline white powder known as lyophilized peptide. This powder can be stored at room temperature until it is ready to be reconstituted with bacteriostatic water. Once received, peptides should be stored in a cold, dark environment. If they are intended for immediate use or use within a few days, weeks, or months, short-term storage in a refrigerator at 4°C (39°F) is generally sufficient. Lyophilized peptides are typically stable at room temperature for several weeks or longer, making refrigeration adequate for short- to medium-term storage. For long-term storage (several months to years), it is recommended to keep peptides in a freezer at -80°C (-112°F). Freezing is the optimal method for preserving the stability of peptides over extended periods.).