Tools · Storage
Peptide storage & stability chart
By An NayalLast reviewed
How long a peptide stays good depends on two things: whether it is still a sealed powder or already mixed, and how cold you keep it. Look up one compound, or sort the whole list.
The short answer
Sealed powder lasts longest frozen (often a year or more). Once you mix it with bacteriostatic water, most peptides keep about 28-30 days refrigerated and should not be frozen. Mixed with plain sterile water instead, the window drops to roughly 24 hours. These are consensus ranges for research peptides - the chart tags every compound by how strong the evidence behind its figures is.
BPC-157
ConsensusLyophilized (unmixed powder)
Room temp
Days (ship window)
Fridge 2-8 C
Short-term
Frozen -20 C
~24+ mo (-20 C)
Reconstituted (after mixing)
Room temp
Hours to days
Fridge 2-8 C
~28 days
Frozen -20 C
Avoid
No FDA-backed shelf life exists. Community guidance: keep the mixed vial refrigerated and discard if it turns cloudy or changes color.
Track this BPC-157 vial. Log the mix date and get a use-by reminder when the tracker opens.->What the evidence tag means
- Label from an approved product label
- Pharmacy BUD compounding-pharmacy use-by date
- Consensus vendor/community consensus, not clinically established
Track this vial instead of doing the mental math
The hardest part is not the shelf life - it is remembering the date you mixed a vial three weeks ago. Pepteca's tracker (in progress) will hold a vial inventory that logs the reconstitution date and reminds you before a solution passes its use-by window. Join the waitlist below and we will email you when it opens.
The waitlist form is at the bottom of this page.
How to read the chart
The chart has two views. Look up one compound shows two small grids for the compound you pick. The first is the sealed, freeze-dried powder (lyophilized). The second is the solution after mixing (reconstituted). Each grid has three columns: room temperature, the fridge at 2-8 C, and the freezer at -20 C. Under the grids you get a one-line note on where the figures come from and a link to the compound's reference card, where the full sources live.
All compounds narrows every row to the two figures most people want: how long the mixed solution lasts in the fridge, and how long the powder lasts frozen. Tap the Compound or Evidence heading to sort, and tap it again to reverse the order. Sorting by evidence groups compounds that share a tag.
Take BPC-157, the first compound in the lookup. Its powder reads "~24+ mo (-20 C)" frozen, its mixed solution reads "~28 days" in the fridge and "Avoid" in the freezer, and the whole row carries the Consensus tag, short for vendor/community consensus.
A dash means no figure. When we could not support a number for a cell, the chart shows "-" rather than a guess. A dash does not mean zero days, and it does not mean the cell is safe forever. It means the evidence is not there.
Each compound has one evidence tag, and it applies to all of that compound's figures. A Label tag means the figures come from an approved product's prescribing information. Pharmacy BUD is a beyond-use date a compounding pharmacy assigns. It varies by pharmacy, so treat it as their instruction, not a universal rule. Consensus is the range vendor and community guidance converges on; it is widely repeated but not clinically established. N/A marks a compound taken by mouth, which is never mixed, so the table shows "Oral - not mixed" in place of a fridge figure.
Of the 19 compounds in the chart, 2 carry a Label tag, 3 a Pharmacy BUD tag, 13 a Consensus tag and 1 is oral. Most of the chart is consensus because published stability data for research peptides is thin.
A wrong number here is a safety and credibility problem, so we would rather show a range and name its limits than invent precision. To share one compound, pick it in the lookup and copy the address bar: the link opens the chart on that compound.
The rules that hold across almost every peptide
- Powder beats solution. A sealed, freeze-dried vial is far more stable than the same peptide once it is mixed - reconstituting starts the clock.
- Colder is longer, for the powder. Frozen at -20 C or below keeps sealed powder longest; the fridge is a shorter-term hold; room temperature is really just the shipping window.
- Once mixed, the fridge - not the freezer. Reconstituted solution is kept at 2-8 C. Freezing it risks freeze-thaw damage for many peptides.
- Bacteriostatic water buys you weeks; sterile water buys you a day. The preservative in bacteriostatic water is what allows a multi-week window after mixing.
- Trust your eyes. Discard any solution that turns cloudy, changes color, or develops particles, whatever the calendar says.
Mixing a vial now? Run the reconstitution calculator or browse the full compound library.
Questions people ask
How long does a reconstituted peptide last in the fridge?
For most research peptides mixed with bacteriostatic water, community and vendor guidance converges on about 28-30 days refrigerated at 2-8 C. This is a consensus range, not a clinically established shelf life. Peptides mixed with plain sterile water (no preservative) are usually limited to about 24 hours. Compounding-pharmacy products carry their own beyond-use date - follow it.
Can you freeze a reconstituted peptide?
Usually not. For many peptides, community sources warn that ice crystals and freeze-thaw cycling can shear the peptide apart, so the reconstituted solution is kept refrigerated instead. A few sources describe freezing single-use aliquots, but repeated freeze-thaw is discouraged across the board. The unmixed powder, by contrast, is the form that stores best frozen.
How should the unmixed (lyophilized) powder be stored?
Cold and dark. Freezing at -20 C or colder gives the longest shelf life for the sealed powder - often quoted in the 1-2 year range and beyond - while refrigeration is a shorter-term option. Room temperature is generally only meant for the days-to-weeks shipping window.
Are these numbers official?
Only where a compound has an approved label or a compounding-pharmacy date, which the chart tags accordingly. For most research peptides, published stability data is thin, so the figures are the conservative vendor/community consensus and are labeled as such. Where no supportable figure exists, the chart shows a dash rather than inventing one.
Pepteca is for education and information only. It does not provide medical advice, diagnosis, or treatment, and its calculators perform unit math only. Always verify with a licensed provider before starting, changing, or stopping any protocol. Many peptides are not approved for human use and may be regulated differently where you live.