How Long Do Reconstituted Peptides Last?
Storage timelines and degradation signs
5 min readQuick Answer:
Most reconstituted peptides last 14-28 days when stored at 2-8°C (36-46°F). BPC-157 is stable for approximately 28 days. Semaglutide lasts up to 56 days. Lyophilized (powder) peptides last 12-24 months. Once mixed with bacteriostatic water, the clock starts.
Shelf Life by Compound
| Compound | Reconstituted Shelf Life | Storage Temp |
|---|---|---|
| BPC-157 | ~28 days | 2-8°C |
| TB-500 | ~21 days | 2-8°C |
| Semaglutide | ~56 days | 2-8°C |
| CJC-1295 (no DAC) | ~14 days | 2-8°C |
| Ipamorelin | ~21 days | 2-8°C |
| Tesamorelin | ~14 days | 2-8°C |
| GHK-Cu | ~14-21 days | 2-8°C |
These are conservative estimates. Actual stability depends on reconstitution method, storage conditions, and peptide purity.
Titer tracks reconstitution dates per vial.
Get warned before expiration. Never inject degraded compounds.
Why the Clock Starts at Reconstitution
Lyophilized (freeze-dried) peptides are extremely stable because there's no water for degradation reactions. Once you add bacteriostatic water:
- Hydrolysis begins - Water slowly breaks peptide bonds
- Oxidation accelerates - Dissolved oxygen degrades sensitive amino acids
- Bacterial risk - Even BAC water (0.9% benzyl alcohol) has limits on contamination prevention
The benzyl alcohol in BAC water slows bacterial growth but doesn't prevent chemical degradation. Cold temperatures slow both processes.
Signs of Degradation
- Cloudiness or particulates - Clear solution becoming hazy indicates protein aggregation
- Color change - Yellowing or browning suggests oxidation
- Reduced effectiveness - Same dose producing weaker effects than expected
- Unusual odor - Foul smell indicates bacterial contamination
- Visible particles - Floating matter means discard immediately
If you observe any of these signs, discard the vial. Do not attempt to filter or salvage.
Storage Best Practices
- Refrigerate immediately after reconstitution - 2-8°C (36-46°F), standard fridge temperature
- Never freeze reconstituted peptides - Ice crystals destroy peptide structure
- Protect from light - Store in original box or wrap in foil
- Minimize needle punctures - Each puncture introduces potential contaminants
- Label everything - Write reconstitution date, compound name, concentration on vial
- Don't shake - Swirl gently to mix. Shaking denatures proteins
The Inventory Problem
At 250mcg BPC-157 twice daily from a 5mg vial (2ml BAC water), one vial lasts 10 days. For a 28-day cycle, you need 3 vials. But each vial is stable for ~28 days, so timing matters:
Vial 2: Reconstitute Day 11, use Days 11-20 (within 28-day window)
Vial 3: Reconstitute Day 21, use Days 21-28 (within 28-day window)
If you reconstitute all 3 vials on Day 1, vial 3 expires around the same time you finish it. Reconstitute only when the previous vial runs out. For the full breakdown, see peptide inventory math nobody does.
BAC Water vs Sterile Water
- Bacteriostatic water (BAC) - Contains 0.9% benzyl alcohol preservative. Multi-use vials. Extends shelf life by inhibiting bacterial growth.
- Sterile water - No preservative. Single-use only. Reconstituted peptides last 24-48 hours maximum.
Always use BAC water for multi-dose vials. Sterile water is only appropriate for single-injection reconstitution.
Related Questions
- BPC-157 reconstitution: 5mg in 2ml BAC water
- How many doses in a peptide vial?
- How to calculate peptide dose after reconstitution
Titer tracks reconstitution dates and warns before expiration.
Label once. Get reminded when a vial expires. Never inject degraded compounds.
See Plans & PricingDisclaimer: This is a storage reference, not medical advice. Consult a healthcare provider for protocol guidance.