Peptide Stability & Storage Guide
A comprehensive reference for handling, reconstitution stability, and storage protocols across 50 research peptides.
For Research Reference Only
This information is compiled from publicly available literature. Always consult manufacturer COAs and storage documentation for your specific lot. Stability times are approximations and can vary by manufacturer, purity, and storage conditions.
Need to calculate reconstitution volumes? Use our Peptide Calculator
The Golden Rules of Peptide Handling
The No-Shake Rule
Mechanical Stress
Never shake a peptide vial. Shaking creates foam and denatures the protein chains.
Swirl gently in a circular motion or roll the vial between your palms until dissolved.
Temperature Equilibration
Thermal Shock Prevention
Never reconstitute a vial directly from the freezer. Rapid temperature change damages the lyophilized structure.
Let the sealed lyophilized vial sit at room temperature for 15-30 minutes before adding bacteriostatic water.
The Reconstitution Stream
Solvent Introduction
Never spray bacteriostatic water directly onto the powder cake. Direct impact fragments the peptide.
Aim the syringe needle at the inside glass wall so the water dribbles down gently onto the powder.
Freeze-Thaw Cycles
Storage Discipline
Never repeatedly freeze and thaw a reconstituted vial. Each cycle degrades potency by 5-15%.
Aliquot reconstituted peptide into single-use portions before freezing. Thaw only what you need.
Additional Storage Tips
UV / Light Sensitivity
Use amber vials or wrap in foil for GHK-Cu, Oxytocin, LL-37, Melanotan II, and IGF-1 variants. Light exposure accelerates degradation.
Temperature Ranges
Lyophilized powder: -20°C / -4°F (freezer). Reconstituted solution: 2-8°C / 36-46°F (refrigerator). Never store reconstituted peptides at room temperature long-term.
Bacteriostatic Water
Always use bacteriostatic water (0.9% benzyl alcohol) for reconstitution. Sterile water lacks the preservative and shortens usable life significantly.
How to Read a Certificate of Analysis (COA)
Every reputable vendor ships a COA with each batch. Here are the five fields to check before using any peptide:
Purity (HPLC)
Look for 98% or higher. Lower purity means more impurities that could affect results.
Mass Spectrometry (MS)
Confirms the molecular weight matches the target peptide. A mismatch means wrong compound.
Endotoxin Testing
Should read "below detectable limits" or < 0.5 EU/mg. High endotoxin causes inflammation.
Batch / Lot Number
Must match the number printed on your vial label. A mismatch means the COA is for a different batch.
Testing Date
Should be recent relative to the manufacture date. Old test results may not reflect current purity.
Peptide Terminology Glossary
Common Reconstitution Volumes
| Vial Size | Reconstitution Water | Concentration |
|---|---|---|
| 2 mg | 1 mL | 2,000 mcg/mL |
| 5 mg | 2 mL | 2,500 mcg/mL |
| 10 mg | 2 mL | 5,000 mcg/mL |
| 15 mg | 3 mL | 5,000 mcg/mL |
These are common starting points. Adjust water volume to achieve your target concentration. Use the Peptide Calculator for exact measurements.