Peptide storage temperatures
How to store lyophilized and reconstituted peptides — refrigeration, freezing, light, and peptide-specific notes for CJC, IGF-1 LR3, and BPC-157.
Updated May 7, 2026 · 6 min read
Peptide storage is straightforward but unforgiving. Lyophilized (dry) powder is stable for months at moderate temperatures. Reconstituted vials need refrigeration. Freezing damages reconstituted peptides. Heat above 25°C accelerates degradation. Most "this peptide stopped working" complaints trace to a storage mistake — a vial left on the counter, a freezer-shipped vial that thawed in transit, a fridge that's actually running too warm.
The two states a peptide can be in
Every vial is in one of two states:
| State | What it is | Stability |
|---|---|---|
| Lyophilized | Freeze-dried powder | Stable for months at room temp; longer refrigerated |
| Reconstituted | Mixed with BAC water | Roughly 28 days refrigerated for most peptides |
Lyophilized peptide is what arrives in the vial from the manufacturer. Reconstituted means you've added water — the peptide is now in solution and the clock starts.
Lyophilized storage
Dry powder is the easy state. Most peptides tolerate:
| Condition | Tolerance |
|---|---|
| Room temperature (15–25°C / 59–77°F) | Weeks to a few months for most peptides |
| Refrigerated (2–8°C / 36–46°F) | Months to a year |
| Frozen (-20°C / -4°F or colder) | Years for many peptides — pharmaceutical long-term storage |
| Direct sunlight or above 30°C | Avoid — accelerates degradation |
| Humidity | Avoid — moisture absorption can affect lyophilization integrity |
The standard recommendation: store lyophilized vials in the refrigerator until the day you reconstitute. Freezing is fine for long-term storage but unnecessary for vials you'll use within a few months. Room-temp storage is acceptable for short transits and brief periods, but the fridge is a better default.
Reconstituted storage
Once water is added, the peptide is in solution and degrades faster. The standard for most peptides:
| Condition | Tolerance |
|---|---|
| Refrigerated (2–8°C) | 28 days for most peptides — the BAC water shelf life |
| Room temperature | Use within hours, not days — degradation accelerates |
| Frozen | Avoid. Freeze-thaw cycles damage many peptide structures |
| Above 25°C / 77°F | Avoid — significantly accelerates degradation |
| Light exposure | Minimize — some peptides are photo-sensitive |
The 28-day figure is approximate. It comes from the BAC water benzyl alcohol shelf life — the preservative keeps the vial bacteriostatic for about a month. Most peptides themselves are stable for longer, but the diluent's protection sets the practical limit.
Why you should not freeze reconstituted peptides
Freezing reconstituted peptides is a common mistake based on the (correct) intuition that cold preserves things. The problem isn't the cold — it's the freeze-thaw cycle:
- Ice crystals form during freezing, physically disrupting peptide structures
- Concentration gradients form as water freezes preferentially, exposing peptides to local high-concentration zones that promote aggregation
- Thawing introduces another round of stress
- Repeated freeze-thaw amplifies the damage with each cycle
Even a single freeze-thaw can produce noticeable potency loss in fragile peptides. For long-term storage of reconstituted material, refrigeration is the right answer — not freezing.
The exception: if you reconstitute a large vial and want to portion it into single-use aliquots, freezing the aliquots once (and thawing each only when needed) is more acceptable than repeated freeze-thaw of one master vial. This is uncommon for self-administered peptide use.
Peptide-specific stability notes
Different peptides have different stability profiles:
| Peptide | Lyophilized | Reconstituted | Notes |
|---|---|---|---|
| BPC-157 | Stable, robust | 28+ days refrigerated | Forgiving of brief room-temp exposure |
| TB-500 | Stable | 28 days refrigerated | Standard storage |
| Ipamorelin | Stable | 28 days refrigerated | Standard storage |
| CJC-1295 (no DAC) | Stable | 14–21 days refrigerated | Slightly more fragile |
| CJC-1295 with DAC | Very stable | 28+ days refrigerated | DAC increases solution stability |
| IGF-1 LR3 | Stable | 14–21 days refrigerated | More fragile; minimize agitation |
| IGF-1 DES | Stable | 14–21 days refrigerated | Similar to LR3 |
| MOTS-c | Stable | 28 days refrigerated | Standard storage |
| GHK-Cu | Stable | Standard storage | Light-sensitive — store in dark |
| Tesamorelin | Stable | 28 days refrigerated | Standard storage |
| Sermorelin | Stable | 14–21 days refrigerated | More fragile in solution |
These are general guidance windows. Vendor COAs and product inserts may specify different ranges based on formulation.
Fridge specifics
Not all fridges are equal:
- Door storage is warmer and more temperature-volatile than the main compartment. Avoid for peptides
- Crisper drawers are usually the most temperature-stable spot
- Back-middle shelf is generally consistent and dark
- Freezer-adjacent zones can be unevenly cold and risk accidental freezing
A simple fridge thermometer ($5–10) is worth it. Target 2–8°C. Some home fridges run colder than 2°C in spots — cold enough to freeze water in the BAC water bottle, which means cold enough to freeze a reconstituted vial.
Travel and shipping
| Scenario | Approach |
|---|---|
| Short trip with vial | Insulated bag with ice pack; replace ice every 4–6 hours |
| Air travel | Carry-on; insulated bag; declare at security if asked |
| Heat-wave shipment | Most reputable vendors ship lyophilized peptides on cold packs in summer; reconstituted should not be shipped |
| Frozen-shipped delivery | Refrigerate immediately; do not refreeze; check for thaw evidence (warm packs) |
| Hot car | Avoid — even short exposure to high temps degrades peptide |
Lyophilized peptides tolerate brief warm exposure during shipping. Reconstituted vials tolerate it poorly — don't ship reconstituted material if avoidable.
How to tell if a vial has gone bad
Visual signs of compromised reconstituted peptide:
- Cloudiness or visible particles — protein aggregation, contamination, or precipitation
- Color change — most peptides are clear/colorless; yellowing or other tints suggest degradation
- Visible sediment at the bottom that doesn't redissolve with gentle swirling
- Odor — fresh BAC water has a faint alcohol smell; sour or off odors are warnings
When in doubt, discard. A vial costs $40–80; an injection-site infection costs much more.
Storage log
For users running multiple peptides, a simple log helps:
| Vial | Reconstituted date | Discard by |
|---|---|---|
| BPC-157 (5 mg) | 2026-04-15 | 2026-05-13 |
| TB-500 (5 mg) | 2026-04-22 | 2026-05-20 |
| Ipamorelin (10 mg) | 2026-04-29 | 2026-05-27 |
Tape an index card to the fridge door. Cross out vials you've finished. The log catches the "wait, when did I reconstitute this?" question that otherwise leads to inadvertent use of expired material.