Peptide storage chart
How long a vial lasts as powder and once mixed, in the fridge, the freezer and on the counter, with a discard-by date for the vial in your hand.
Once you add bacteriostatic water, the clock starts. Powder is the stable form; a mixed vial is a solution with a limited fridge life, and nothing about its appearance tells you when it has lost potency. The table is the conservative consensus, the same figures printed in The Protocol Pack. Most of these compounds have never been through a formal stability programme, so treat it as a planning rule, not a guarantee, and use anything you are unsure about sooner rather than later.
How long peptides last, by state and place
| State | Where | Working assumption |
|---|---|---|
| Powder, sealed | Freezer, -20 °C | Longest. Years, per most vendor documentation |
| Powder, sealed | Fridge, 2 to 8 °C | Months to years; 12 to 18 months is a sensible working limit |
| Powder, sealed | Room temperature | Weeks. It ships this way routinely |
| Reconstituted | Fridge, 2 to 8 °C | 2 to 4 weeks is the conservative window; 3 to 8 weeks is commonly quoted, compound dependent |
| Reconstituted | Room temperature | Days at most. Refrigerate as soon as you notice |
| Reconstituted | Freezer | Avoid. Freeze-thaw damages folded peptides |
| Any state | Direct sun, a hot car, a checked bag | Assume degraded |
Date you mixed the vial and the window you work to
Pick the date you added the water.
Write it on the vial in marker. The number is a planning date, not a guarantee: discard earlier if the solution turns cloudy or shows particles.
Why the mixed vial is the weak point
Bacteriostatic water carries 0.9% benzyl alcohol, which holds back bacterial growth across repeated needle entries and is what buys weeks rather than days. It does not stop the peptide itself slowly breaking down in solution. That is why the practical rule is to mix only what you will use in the window above: if a vial would last you five months at your dose, the powder is safer in the fridge than the solution. The reconstitution calculator shows doses per vial, which tells you how long a vial will actually take to finish.
Rules that follow from the table
- Back of the middle shelf, not the door. The door swings several degrees on every opening and is the warmest part of a fridge.
- Keep it dark. The carton exists for a reason. If it is gone, a small opaque box works.
- Label it the day you mix it. Compound, water volume, date mixed, discard-by date. The helper above gives you the last one.
- Never freeze a mixed vial to make it last longer. Ice crystals and freeze-thaw cycles do more damage than the fridge days you were trying to save.
Travelling with a mixed vial
Hold luggage and car interiors both reach temperatures far outside the useful range, so a vial travels in hand luggage, cold, and never in a checked bag or a glovebox. An insulated pouch with a cool pack covers a day. For longer trips, VialHaus Cold, from the same team as this site, is a battery cooler with a vial tray that holds the 36 to 46 °F fridge range in a normal room; its battery is about 50 Wh, under the 100 Wh airline limit, so it goes in the cabin. VialHaus also makes hard-shell vial cases and a free date tracker for what is in your fridge. It ships in the US only.
Signs a vial is past it
Persistent cloudiness, particles, strands, discolouration, a film on the glass, or a change in smell. Any of those and the answer is the same: discard it. So is a vial whose history you cannot account for. For the longer version, with how to handle a vial that was left out overnight, see the storage guide at Peptide Bureau.
25 printable pages: dosing cards for the twelve most-used compounds at three water volumes, titration planners, a vial log, and five pages on what to do when it has already gone wrong.
Common questions
- How long does a reconstituted peptide last in the fridge?
- Two to four weeks is the conservative working window at 2 to 8 °C with bacteriostatic water. Three to eight weeks is commonly quoted and it depends on the compound, but few research peptides have published stability data, so plan on the short end.
- How long does peptide powder last?
- Sealed and in the fridge, months to years; 12 to 18 months from receipt is a sensible working limit. Frozen, longer. At room temperature, weeks, which is why powder ships without ice routinely.
- Can I freeze a reconstituted peptide?
- It is best avoided. Freezing and thawing a solution damages folded peptides, and repeated cycles are worse than one. Mix smaller amounts instead.
- Does a vial go bad if it was left out overnight?
- One night at normal room temperature is usually not the end of a mixed vial, but it shortens the window. Refrigerate it straight away and use it first. A night in a hot car or in direct sun is different: assume it is degraded.
- Does bacteriostatic water make it last longer than sterile water?
- Yes. The benzyl alcohol preservative is what makes weeks of repeated use possible. It is what buys three to four weeks of refrigerated life instead of about one with sterile water.
All calculators and charts
Weight management (GLP-1 family)
- Retatrutide calculator Vial, water and weekly dose to syringe units
- Tirzepatide calculator The 2.5 to 15 mg ladder, converted
- Semaglutide calculator The 0.25 to 2.4 mg ladder, converted
- Cagrilintide calculator Amylin analogue, 0.3 to 4.5 mg weekly
Growth hormone axis
- HGH (somatropin) calculator IU vials to syringe units
- Ipamorelin calculator mcg doses, in mL and units
- CJC-1295 (no DAC) calculator No-DAC and DAC, mcg to units
- CJC-1295 / Ipamorelin blend calculator The 5 mg + 5 mg blend, per component
- Sermorelin calculator Nightly mcg doses to units
- Tesamorelin calculator 1 to 2 mg daily, in units
- Hexarelin calculator mcg doses to units
- IGF-1 LR3 calculator Tens of mcg from very small vials
- AOD-9604 calculator 300 mcg daily, in units
- MOTS-c calculator 5 to 10 mg, two or three times a week
Repair, skin and blends
- BPC-157 calculator mcg doses from a 5 or 10 mg vial
- TB-500 calculator Loading and maintenance, in units
- BPC-157 / TB-500 blend calculator The Wolverine stack, per component
- GHK-Cu calculator 50 to 200 mg vials, mg doses
- GLOW blend calculator The 70 mg blend, split per component
- KLOW blend calculator The 80 mg blend, split per component
Other compounds
- PT-141 calculator 0.5 to 2 mg, as needed
- Melanotan II calculator mcg loading doses to units
- NAD+ calculator 100 to 1,000 mg vials, 25 to 200 mg doses
- Thymosin alpha-1 calculator 1.6 mg twice weekly, in units
- Epitalon calculator Short courses of 5 to 10 mg
- Kisspeptin-10 calculator mcg doses to units
- Glutathione calculator Hundreds of mg, or a 200 mg/mL solution
Dosage charts and schedules
- Peptide reconstitution chart Concentration for every vial and water combination
- Peptide dosing chart Printable unit tables for every compound
- Retatrutide titration schedule 2 to 12 mg in units, stage by stage
- Tirzepatide titration schedule 2.5 to 15 mg in units, stage by stage
- Semaglutide titration schedule 0.25 to 2.4 mg in units, stage by stage
- KLOW dosage and frequency chart The 80 mg blend at 2, 3 and 4 mL, both phases
- GLOW dosage chart The 70 mg blend, units to each peptide
- Wolverine stack dosing chart BPC-157 + TB-500, blend and separate vials
- MOTS-c dosage chart 5 and 10 mg vials at three water volumes
- Tirzepatide reconstitution chart Every vial size, every water volume, the whole ladder
- Retatrutide dosing chart 1 to 12 mg across 10, 20 and 30 mg vials
- Tirzepatide units to mg chart Both directions, every vial and water volume
- Semaglutide units to mg chart The dosage chart in units, both directions
- NAD+ injection dosage chart Per day, per week and frequency, 100 to 1,000 mg vials
- Tesamorelin dosage chart 2, 5 and 10 mg vials, 0.5 to 2 mg in units
- BPC-157 dosage chart mcg doses from 5 and 10 mg vials, four water volumes
- PT-141 dosage chart The 10 mg vial, 0.5 to 2 mg, with uses per vial
- Sermorelin dosage chart Nightly mcg doses from 5, 10 and 15 mg vials
- Printable dosing charts Four one-page charts to save, pin or print
- Peptide storage chart (this page)
Tools
- Peptide calculator The general tool, any compound
- Reconstitution calculator How much water to add, and why it matters
- Bacteriostatic water calculator Pick a volume that lands where you can read it
- How to read an insulin syringe U-100 vs U-40, and the 2.5x error
- The Protocol Pack Free 25-page printable reference
- mg to units calculator Both directions, any concentration, with the reference tables
- 1 mg to units on an insulin syringe The conversion table for every common concentration
- Units to mg calculator The mark you drew, back into milligrams
- 2 mg to units on an insulin syringe 2 mg at every common vial and water volume
- 2.5 mg to units on an insulin syringe 2.5 mg at every common vial and water volume
- 5 mg to units on an insulin syringe 5 mg at every common vial and water volume
- 10 mg to units on an insulin syringe 10 mg at every common vial and water volume
- 12 mg to units on an insulin syringe 12 mg at every common vial and water volume
- 15 mg to units on an insulin syringe 15 mg at every common vial and water volume
- Methodology Every formula, assumption and rounding rule
- About Peptulator Who publishes it, independence and contact
- Embed the calculator One line of HTML, free, credit line only