Storage Overview

Peptides are sensitive biological molecules that can degrade through oxidation, hydrolysis, and aggregation. Proper storage conditions vary depending on whether the peptide is in lyophilized (freeze-dried) or reconstituted form. Following these guidelines will help maintain maximum potency throughout your research.

Storing Lyophilized (Powder) Peptides

Lyophilized peptides are the most stable form. When stored correctly, most research peptides maintain potency for months to years.

Storage Condition	Temperature	Duration	Best For
Long-term	-20°C (freezer)	1-2+ years	Bulk stock, infrequent use
Medium-term	2-8°C (fridge)	3-6 months	Active research supply
Short-term	Room temperature	1-4 weeks	Transit only — not recommended

Key Rules for Lyophilized Storage

• Keep sealed: Do not open vials until ready to reconstitute. Moisture exposure begins degradation.
• Protect from light: Store in original packaging or wrap in foil. UV light damages peptide bonds.
• Use desiccant packs: Include silica gel packets in storage containers to absorb moisture.
• Avoid freeze-thaw cycles: If storing in freezer, do not repeatedly remove and return vials.
• Label everything: Date received, peptide name, lot number, and expiration.

Storing Reconstituted Peptides

Once reconstituted with bacteriostatic water, peptides are significantly less stable and require more careful handling.

Reconstitution Solvent	Temperature	Shelf Life
Bacteriostatic Water	2-8°C (fridge)	3-4 weeks
Sterile Water	2-8°C (fridge)	24-48 hours
Acetic Acid	2-8°C (fridge)	2-4 weeks

Key Rules for Reconstituted Storage

• Always refrigerate: Never leave reconstituted peptides at room temperature.
• Use BAC water: Bacteriostatic water extends shelf life significantly over sterile water.
• Keep upright: Store vials upright to minimize rubber stopper contact with solution.
• Minimize needle punctures: Each puncture introduces potential contamination.
• Never freeze reconstituted peptides: Ice crystal formation can damage peptide structures.

Peptide-Specific Storage Notes

Peptide	Special Notes	Stability
BPC-157	Highly stable; tolerant of brief temp changes	Excellent
TB-500	Stable lyophilized; use reconstituted within 3 weeks	Good
Semaglutide	Very stable peptide; extended reconstituted life	Excellent
CJC-1295	DAC version more stable; store away from light	Good
Ipamorelin	Standard storage; reconstitute with BAC water only	Good
NAD+	Hygroscopic — very sensitive to moisture	Moderate
GHK-Cu	Copper complex is stable; protect from oxidation	Good

Common Storage Mistakes

• Leaving vials on the counter: Even 30 minutes at room temperature after reconstitution accelerates degradation.
• Storing near the freezer door: Temperature fluctuates most at the door. Store in the back.
• Using sterile water for multi-use vials: Without preservative, bacterial contamination occurs rapidly.
• Exposing to sunlight: UV radiation breaks peptide bonds. Always store in dark conditions.
• Shaking vials: Vigorous shaking can denature peptides. Gentle swirling only.

Frequently Asked Questions

Can I freeze reconstituted peptides?

No. Freezing reconstituted peptides can cause ice crystal formation that damages the peptide structure. Always refrigerate at 2-8°C and use within the recommended timeframe.

How do I know if my peptide has degraded?

Signs of degradation include cloudiness, visible particles, color changes (yellowing), or unusual odor. Clear, colorless solution indicates proper condition. When in doubt, discard and reconstitute a fresh vial.

Do peptides need to be shipped cold?

Lyophilized peptides can tolerate brief periods at room temperature during shipping. However, premium vendors ship with cold packs during warm months. Reconstituted peptides should always be shipped cold.