Peptide Storage & Stability Guide
Proper storage is critical to peptide integrity. This guide covers optimal temperatures, compound-specific shelf life data, degradation signs, and an interactive stability calculator.
| Form | Temperature | Container | Shelf Life | Key Notes |
|---|---|---|---|---|
| Lyophilized (powder) | -20°C | Sealed vial, original box | 2–5 years | Protect from moisture; desiccant recommended |
| Reconstituted (solution) | 2–8°C | Amber vial or foil-wrapped | 14–56 days | Never freeze; use BAC water for multi-draw |
| Long-term archive | -80°C | Cryovial, sealed with parafilm | 5+ years | Ultra-cold storage; minimize freeze-thaw cycles |
| BAC water (opened) | 20–25°C | Original sealed vial | 28 days | Benzyl alcohol preserves; store upright |
| Compound ▲▼ | Category | Lyoph. Shelf Life | Recon. Shelf Life | Light Sensitive | Container |
|---|
All shelf life estimates assume proper storage conditions. Individual results may vary based on purity and handling.
Always inspect your reconstituted peptide before each use. A properly stored solution should remain crystal clear and colorless.
● Bacteriostatic Water (BAC)
- ✓ Contains 0.9% benzyl alcohol
- ✓ Inhibits bacterial growth
- ✓ Multi-use vials (up to 28 days)
- ✓ Standard for peptide reconstitution
- ✓ Widely available, inexpensive
- Best for: Any peptide drawn from multiple times
● Sterile Water (SW)
- ! No preservative agent
- ✗ No bacterial growth inhibition
- ✗ Single-use only (within 24h)
- ! Required for benzyl alcohol allergy
- ✓ Ultra-pure, no additives
- Best for: Single-dose use or BA-sensitive individuals
Cold Chain
Use an insulated cooler bag with gel ice packs rated for 2–8°C. Avoid direct ice contact with vials. Pre-chill the bag before packing.
Air Travel (TSA)
Peptides in labeled research vials are generally permitted in carry-on luggage. Declare if asked. Keep vials accessible for screening. Syringes require a medical letter.
Shipping
Ship lyophilized peptides ambient (stable). Ship reconstituted peptides with cold packs in insulated mailers. Use next-day or 2-day shipping to minimize transit time.
Documentation
Carry Certificates of Analysis (COA), original labels, and purchase receipts. International travel may require additional customs documentation for research materials.
Timing
Reconstituted peptides can tolerate 4–6 hours outside refrigeration if kept cool. Plan travel to minimize time without proper storage. Return to fridge ASAP.
Avoid
Never check peptides in airline luggage (cargo hold temperature extremes). Never leave in a hot car. Never ship reconstituted peptides without cold packs in summer.
Select your compound and enter the reconstitution date to see estimated expiry, days remaining, and current status.
Frequently Asked Questions
How long do lyophilized peptides last in storage?
Most lyophilized (freeze-dried) peptides remain stable for 2+ years when stored at -20°C in a sealed vial protected from light and moisture. Some highly stable compounds like BPC-157 and TB-500 can last 3+ years under ideal conditions. For ultra-long-term archival, -80°C storage can extend stability to 5+ years.
How should I store reconstituted peptides?
Reconstituted peptides should be stored at 2–8°C (standard refrigerator temperature) in the back of the main compartment. Never freeze reconstituted peptides, as ice crystal formation damages the peptide structure. Use within the compound-specific timeframe — typically 14–56 days depending on the peptide. Always use bacteriostatic water for multi-draw vials.
What is the difference between BAC water and sterile water?
Bacteriostatic water contains 0.9% benzyl alcohol, which inhibits bacterial growth and makes it safe for multi-dose vials used over days or weeks. Sterile water has no preservative and should only be used for single-dose preparation, consumed within 24 hours. For virtually all peptide reconstitution, bacteriostatic water is the recommended choice.
How can I tell if a peptide has degraded?
Inspect the solution before every use. A properly reconstituted peptide should be perfectly clear and colorless. Warning signs include: cloudiness or turbidity, visible particles or floating matter, any color change (yellowing, browning), and unusual odor beyond faint benzyl alcohol. If any of these signs are present, discard the vial immediately.
Can I travel with research peptides?
Yes. Lyophilized peptides are easiest to travel with as they are stable at ambient temperature. For reconstituted peptides, use an insulated cooler bag with gel ice packs to maintain 2–8°C. For air travel, keep peptides in original labeled vials with COA documentation in your carry-on. Syringes typically require a medical letter or prescription. Always check current TSA and airline-specific guidelines before traveling.
