Last reviewed: January 2026
Doses remaining, expiry countdown, and storage guidance for your reconstituted peptide vials.
→ Use this as an educational reference. Peptide dosing information is provided for research and educational purposes. Always consult a healthcare provider before starting any peptide protocol.
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A peptide storage calculator tracks how long your reconstituted vials remain viable, when each one expires, and how many doses are left at your current protocol. It also surfaces peptide-specific storage guidance — some compounds are highly sensitive to temperature fluctuations, others tolerate room temperature for weeks, and many are damaged by repeated freeze-thaw cycles in ways that aren't visible from the outside of the vial. The calculator turns these scattered details into a single tracked schedule so you don't end up injecting from a degraded vial because you can't remember exactly when you mixed it.1
Most users underestimate how much peptide they waste through poor storage practice. A 5 mg vial of BPC-157 reconstituted in 2 mL of bacteriostatic water has a stable life of 25–30 days under proper refrigeration. If a typical protocol uses 250 mcg twice daily — that's 14 doses per vial across 7 days — the vial has plenty of headroom. But if the protocol is once weekly at 250 mcg, you'll only use 4 doses out of an available 20 before the solution starts to degrade. Knowing this in advance changes the dilution decision: less water, higher concentration, smaller draw, and the vial is finished before viability becomes a question.
| Stage | Form | Recommended storage | Typical stability |
|---|---|---|---|
| 1. As shipped (lyophilized) | Freeze-dried powder, sealed | Freezer at −20 °C; refrigerator acceptable for <30 days | 2–3 years frozen; 6–12 months refrigerated |
| 2. After reconstitution | Liquid solution, sealed vial | Refrigerator at 2–8 °C; protect from light | 25–30 days for most peptides |
| 3. In-use vial | Liquid, septum punctured | Refrigerator; minimize air exposure | Same as #2 if BAC water used |
Bacteriostatic water (BAC water) contains 0.9% benzyl alcohol, a preservative that suppresses bacterial growth in the multi-puncture-use vial. Sterile water for injection has no preservative — the vial is sterile when manufactured, but once punctured, contamination risk rises with every additional draw. For peptides being used over more than a single dose, BAC water is the standard choice and the one most published research stability data is based on. A reconstituted vial with BAC water is typically stable for 25–30 days refrigerated; with sterile water, the same vial should be discarded within 24–48 hours of first puncture even if mathematically it has more doses left.2
Benzyl alcohol concentrations above ~10 mg/kg/day in newborns have been linked to "gasping syndrome," which is why BAC water is contraindicated for neonates. For adult peptide research at typical doses, the daily benzyl alcohol exposure is well below any concerning threshold — a 1 mL injection from a BAC-water-reconstituted vial contains roughly 9 mg of benzyl alcohol, far below the cumulative limits seen in neonatal IV scenarios.
| Peptide | Stability after reconstitution | Notes |
|---|---|---|
| BPC-157 | 30 days refrigerated | Stable; tolerates brief room-temp excursions |
| TB-500 | 30 days refrigerated | Stable |
| Semaglutide / Tirzepatide | 28 days refrigerated (clinical) | Approved labels specify discard at 28 days from first use |
| CJC-1295 (no DAC) | 14–21 days refrigerated | Less stable than DAC version; minimize freeze-thaw |
| CJC-1295 (with DAC) | 30+ days refrigerated | Stable thanks to DAC binding |
| Ipamorelin | 21–30 days refrigerated | Light-sensitive; store in opaque container |
| IGF-1 LR3 | 10–14 days refrigerated | Less stable; many users dose every other day |
| GHK-Cu | 30 days refrigerated | Copper complex stable; don't freeze reconstituted |
| Epithalon | 10–20 days refrigerated | Often used in short cycles, exhausting vial before stability matters |
| Melanotan II | 30 days refrigerated | Stable; minimize light exposure |
Lyophilized peptide is stable in a freezer for years. Reconstituted peptide should not be frozen, even though "freezer storage extends life" is intuitive. The problem is freeze-thaw cycling: each transition between solid and liquid creates ice crystals that mechanically disrupt the peptide structure, and cumulative cycles produce degradation products even when each individual cycle is brief. A peptide solution that has been frozen and thawed three times has measurably less biological activity than the same peptide that was kept at refrigerator temperature for the same total elapsed time. The practical implication: once you've added BAC water, the solution stays at 2–8 °C until the vial is empty.3
Several peptides are photosensitive — Ipamorelin, Sermorelin, GLP-1 agonists, and most pituitary peptides — meaning UV and visible-spectrum light degrade them over weeks of exposure. The standard mitigation is storing the vial in its original cardboard box or wrapping it in opaque film. Refrigerator interior light is brief enough to be a non-issue if the door is closed promptly.
Air exposure is also a slow degradation pathway, primarily through oxidation. Each septum puncture introduces a small volume of air and a tiny number of microparticles from the syringe needle. The cumulative effect over 20–30 punctures is minor for most peptides, but minimizing puncture count by using larger draws less frequently (where the protocol allows) is a reasonable best practice. Always use a fresh sterile needle for each draw and never re-use needles between draws.
The math the calculator does is straightforward. Doses remaining = (vial size in mcg − cumulative doses drawn in mcg) ÷ dose per injection. Days until expiry = reconstitution date + stability days − today's date. The output you actually use is whichever is shorter — if you have 30 doses remaining but only 15 days until vial expiry, you'll waste at most half the vial unless you're willing to dose more frequently. Adjusting dilution at the start (less water, higher concentration) finishes the vial faster and reduces waste. This is a recurring optimization especially with infrequently-used peptides.
Reconstituted peptides need to stay cold during transit. A small insulated cooler with two ice packs maintains 2–8 °C for 12–24 hours, sufficient for a flight or road trip. Avoid dry ice — the temperature is too low and risks freezing the solution. If you can't keep the solution cold for the entire trip, take only the unreconstituted lyophilized vials (which tolerate room temperature for short periods) and reconstitute on arrival. TSA generally permits prescription medication in carry-on luggage; for unscheduled research compounds, declare per applicable regulations and have documentation available.
For longer trips, consider whether the protocol can be adjusted around the travel window — finishing one vial before departure and reconstituting a fresh vial on arrival is often simpler than transporting a partially-used vial. If you're crossing borders, check the import rules of the destination country in advance. Some peptides that are unscheduled in the US are controlled substances elsewhere, and getting through customs with an unmarked vial of an unfamiliar liquid can create unnecessary problems even when nothing illegal is happening. Carrying the original packaging, a printed protocol from your physician (if applicable), and the BAC water in its labeled vial helps clarify intent.