Peptide Storage Guide

Before Reconstitution (Lyophilized Powder)

Unreconstituted peptides in powder form are relatively stable. For long-term storage (months), keep them in a freezer at -4°F to -4°F (-20°C). For short-term storage (weeks), refrigeration at 36-46°F (2-8°C) is sufficient. Most lyophilized peptides can tolerate brief periods at room temperature during shipping without significant degradation.

• Ideal: Freezer (-20°C) for storage beyond 1 month
• Acceptable: Refrigerator (2-8°C) for storage under 1 month
• Temporary: Room temperature for a few days (during shipping)
• Avoid: Direct sunlight, heat above 77°F (25°C), humidity

After Reconstitution (Mixed with BAC Water)

Once you add bacteriostatic water to your peptide vial, the clock starts. Reconstituted peptides are significantly less stable than their powdered form.

• Always refrigerate at 36-46°F (2-8°C)
• Never freeze reconstituted peptides — freezing can cause precipitation and loss of potency
• Use within 4-6 weeks for most peptides
• Store upright to keep the rubber stopper on top
• Label the vial with peptide name, reconstitution date, concentration, and expected expiration
• Swab the stopper with an alcohol pad before every needle insertion

Signs Your Peptide Has Gone Bad

Discard a reconstituted peptide if you notice any of the following:

• Cloudiness or turbidity (should be crystal clear)
• Visible particles or floating matter
• Color change (should be colorless)
• Unusual smell
• It has been more than 6 weeks since reconstitution

Why Bacteriostatic Water Matters

Bacteriostatic water contains 0.9% benzyl alcohol, which inhibits bacterial growth. This is critical because you'll puncture the rubber stopper multiple times over weeks, introducing tiny amounts of bacteria each time. Regular sterile water lacks this preservative and should only be used for single-draw applications.