How should research peptides be stored?
4 min read · Updated July 2026 · MY PEPTIDES Research Team
Key facts
Research peptides are sensitive to heat, light, moisture and repeated temperature swings, any of which can degrade the molecule before it reaches an assay. Most suppliers ship peptides lyophilised (freeze-dried), because the dry form is more stable than a solution over long archival periods and can be kept colder. MY PEPTIDES vials instead ship as pre-mixed solutions, travelling cold-chain in a sealed foil pouch with ice packs: there is no reconstitution step and no bacteriostatic water to source, which removes the most error-prone stage in preparing a research peptide. In exchange, pre-mixed vials must be refrigerated at 2–8°C on arrival and used within the window on the label, and must never be frozen — freeze–thaw cycling damages peptides already in solution, so freezer advice written for lyophilised powder does not apply. Sound handling also means keeping vials sealed and shielded from light, and labelling and dating everything. Pairing correct storage with a Certificate-of-Analysis-verified starting material lets results be attributed to the compound rather than handling artefacts. All handling described is for in-vitro laboratory research use only — not for human or veterinary use.
Storage is one of the simplest ways to protect the integrity of a research peptide — and one of the easiest things to get wrong. Peptides are sensitive to heat, light, moisture and repeated temperature swings, all of which can degrade the molecule before it ever reaches an assay.
Research use only. This guide covers laboratory storage and handling only. It does not describe preparation methods, volumes, dosing, or any human or animal use.
Lyophilised vs in-solution
Most research peptides are supplied lyophilised (freeze-dried), because the dry form is more stable than a solution over long archival periods. Kept cold, dry and protected from light, lyophilised material remains stable for extended periods. A peptide in solution is less stable over that timescale, which is why in-solution material is kept refrigerated at 2–8°C and used within a defined window rather than stockpiled for years.
How our vials are supplied
MY PEPTIDES vials ship as pre-mixed solutions, not lyophilised powder — there is no reconstitution step, and no bacteriostatic water to source. That trade-off is deliberate: it removes the single most error-prone stage in preparing a research peptide, where contamination, incorrect solvent choice and miscalculated concentration are all introduced by hand at the bench.
What it asks of you in return is straightforward: the vials travel cold-chain in a sealed foil pouch with ice packs, and should be refrigerated at 2–8°C on arrival and used within the window on the label. Do not freeze them — freeze–thaw cycling damages peptides that are already in solution, so the freezer advice that applies to lyophilised powder does not apply here.
Practical handling
- Keep the cold chain. Refrigerate vials at 2–8°C on arrival, as labelled.
- Do not freeze in-solution material. Repeated thawing and refreezing degrades peptides; aliquoting reduces how often a stock is disturbed.
- Protect from light and moisture. Keep vials sealed and shielded from direct light.
- Label and date everything. Stability depends on time as well as temperature.
Why it matters for results
Degraded material introduces an unknown variable. Pairing correct storage with a verified starting material — confirmed by a Certificate of Analysis — is what lets a researcher attribute results to the compound rather than to handling artefacts.
Browse the catalogue — every product is labelled with its storage conditions and ships with a COA.
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Frequently asked questions
- How should lyophilised peptides be stored?
- Kept cold, dry and protected from light. Lyophilised material is more stable than a solution over long archival periods, and colder storage suits it. For laboratory research use only.
- How should MY PEPTIDES vials be stored?
- Our vials are supplied as pre-mixed solutions, so refrigerate them at 2–8°C on arrival and use within the window on the label. Do not freeze them — freeze–thaw cycling damages peptides already in solution. Keep vials sealed and away from direct light. For laboratory research use only.
- Do I need bacteriostatic water to reconstitute your peptides?
- No. Our vials ship pre-mixed, so there is no reconstitution step and no bacteriostatic water to source. That removes the stage where contamination, solvent choice and concentration errors are usually introduced by hand.