Interactive Tool

Peptide Shelf Life Calculator

Updated August 28, 2026

How long does a reconstituted peptide last?

Once a lyophilized peptide is dissolved, it starts to degrade. How fast depends on the solvent, the storage temperature, and the peptide itself. The table below lists the working stability window we use for every compound in our catalog, for both bacteriostatic water and plain sterile water.

Bacteriostatic water contains 0.9% benzyl alcohol, which suppresses bacterial growth and roughly doubles the usable window. Sterile water has no preservative, so the solution should be treated as single-use or short-term. One exception matters: GHK-Cu must never be reconstituted with bacteriostatic water, because benzyl alcohol binds the copper ion and destroys the complex.

Estimate your window

Compound

Solvent

Reconstitution date

Reconstituted stability reference

Values are working windows for refrigerated storage at 2–8 °C, protected from light. They are conservative by design.

Swipe the table sideways to see every column.

Compound	Bacteriostatic water	Sterile water	Handling note
Tirzepatide	28 days	14 days	Relatively stable peptide. Store upright in the refrigerator.
Semaglutide	28 days	14 days	Good stability profile. The albumin-binding chain adds stability.
Retatrutide	28 days	14 days	Similar stability to other GLP-1 agonists.
BPC-157	21 days	7 days	Moderate stability. Some degradation products appear after three weeks.
TB-500	14 days	5 days	Lower stability than smaller peptides due to the 43-amino-acid chain.
GHK-Cu	Not suitable	10 days	Use sterile water only. Benzyl alcohol in bacteriostatic water chelates the copper ion and destroys the peptide.
Ipamorelin	28 days	14 days	Good stability. A small pentapeptide is more stable than longer chains.
CJC-1295	21 days	10 days	Moderate stability. The no-DAC version is slightly less stable than the DAC version.
GHRP-6	28 days	14 days	Good stability. Small hexapeptide.
GHRP-2	28 days	14 days	Good stability. Similar profile to GHRP-6.
MK-677	Not suitable	N/A — oral	Oral compound, no reconstitution. Store cool and dry, away from light.
Sermorelin	14 days	7 days	Shortest active GHRH fragment, so stability is lower. Keep refrigerated at all times.
Semax	14 days	7 days	Nasal solutions degrade faster than injectable preparations.
Selank	14 days	7 days	Nasal solutions degrade faster than injectable preparations.
MOTS-c	21 days	10 days	Mitochondrial peptide with moderate stability.
Epithalon	21 days	10 days	Short tetrapeptide with reasonable stability.
SS-31	21 days	10 days	Keep refrigerated and protected from light.
PT-141	28 days	14 days	Good stability. Cyclic structure resists degradation.
Thymosin Alpha-1	21 days	10 days	Moderate stability. Keep refrigerated.
LL-37	14 days	7 days	Antimicrobial peptide, sensitive to handling. Use promptly.
KPV	28 days	14 days	Very small tripeptide with good stability.
Melanotan II	28 days	14 days	Good stability. Protect from light.
DSIP	21 days	10 days	Moderate stability. Keep refrigerated.
IGF-1 LR3	14 days	7 days	Larger protein, more fragile. Never freeze after reconstitution.
Follistatin-344	14 days	7 days	Large glycoprotein, handle gently and keep cold.

What shortens the window

Temperature is the dominant factor: every excursion to room temperature costs more stability than the clock alone suggests, and repeated warming and cooling is worse than a single longer excursion. Light degrades several compounds, which is why amber vials or a covered container help. Freezing a reconstituted solution is not a way to extend the window; ice crystal formation damages longer chains such as IGF-1 LR3 and Follistatin-344. Agitation matters too, so solutions should be swirled gently rather than shaken.

How these numbers were set

The windows come from published peptide stability literature, manufacturer handling guidance for the equivalent clinical formulations, and the storage conditions stated on each lot's certificate of analysis. Where sources disagreed, we used the shorter figure. They describe chemical stability of the compound in solution, not sterility of the container, which depends entirely on handling technique.

Storage guide Reconstitution protocol Dosage calculator Half-life chart

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Research Use Only. All products sold by Lumen Peppers are intended solely for in vitro research and laboratory purposes. They are not drugs, supplements, or foods. Nothing on this page constitutes medical advice. Researchers are responsible for compliance with all applicable regulations. Last updated: August 28, 2026.