Storing lyophilised material
Lyophilised peptides are stable for extended periods at -20°C, protected from light and moisture. A frost-free freezer that cycles temperature is worse than a stable chest freezer. Keep vials in their original packaging with desiccant where supplied.
Always allow a vial to equilibrate to room temperature before breaking the seal. Opening a cold vial in a warm room draws condensation into the powder, and water is the enemy of a lyophilised peptide.
Reconstitution technique
Use bacteriostatic water (0.9% benzyl alcohol) for multi-use research vials, or sterile water for single-use work. Swab both stoppers with alcohol and let them air-dry.
Introduce the diluent slowly against the inside wall of the vial so it runs down onto the pellet rather than striking it directly. Let the pellet dissolve on its own; if needed, roll the vial gently between your palms. Never shake — mechanical agitation and foaming denature peptides.
- Equilibrate to room temperature before opening
- Diluent down the vial wall, never directly onto the pellet
- Swirl or roll gently; never shake or vortex
- Label with reconstitution date immediately
Post-reconstitution stability
Once in solution, refrigerate at 2–8°C and protect from light. Most reconstituted research peptides are used within 14–28 days depending on the sequence; check the storage note on the individual product page.
Avoid repeated freeze-thaw cycles of solutions. Where longer storage is required, aliquot into single-use volumes before freezing so the bulk is never thawed twice.
Buying in the UK: what to expect from UK Peptide
Every vial is held in UK stock at -20°C in our Central London facility, so there are no customs delays, no overseas drop-shipping and no month-long waits. Orders placed before 2pm Monday to Friday are dispatched the same working day.
Express overnight delivery is £9.99 nationwide and free on orders over £200. Parcels are vacuum-sealed, gel-cooled, insulated and discreet.
- 99%+ minimum purity by HPLC, identity confirmed by mass spectrometry
- Independent third-party UK laboratory testing — never in-house self-certification
- Visa & Mastercard accepted (no American Express)
- Research use only — not for human or veterinary use. Purchasers must be 18+
Frequently asked questions
- What water should be used to reconstitute research peptides?
- Bacteriostatic water containing 0.9% benzyl alcohol is standard for multi-use research vials; sterile water is used for single-use preparations.
- How long does a reconstituted peptide last?
- Typically 14–28 days refrigerated at 2–8°C and protected from light, depending on the sequence. Check the storage note on the product page.
Related guides
All products referenced are laboratory reagents supplied for in-vitro research use only. They are not medicines, supplements or cosmetics, are not licensed for human or veterinary use, and no dosing guidance is provided. Purchasers must be 18 or over.
