How should research peptides be stored?

Storage protects the peptide from the three things that degrade it: heat, light, and water. Handled correctly, lyophilized peptides remain stable for months to years; handled badly, they can lose potency in days.

Lyophilized (powder) form:

• Store at −20°C (long-term) or 2–8°C (short-term, weeks).
• Keep vials sealed in their original packaging until use.
• Avoid repeated temperature cycling — frost-free freezers cycle constantly and can degrade peptides over time.
• Protect from light. Most peptides are light-sensitive.

After reconstitution:

• Store at 2–8°C (standard refrigerator).
• Use the validated stability window for the specific sequence — often 1–4 weeks, sometimes longer for stable peptides like BPC-157.
• Avoid freeze-thaw cycles of the reconstituted solution.

For long-term storage of reconstituted material, single-use aliquots at −80°C are the gold standard for laboratory research.