Lyophilized peptides are forgiving in transit and fragile once dissolved. Keep the cold chain intact, reconstitute cleanly, and your research materials stay exactly what the COA says they are.
Colder is more stable. The bar under each state shows relative shelf life - from months in the freezer to weeks once reconstituted.
| State | Temperature | Typical window | Note |
|---|---|---|---|
| Lyophilized, sealed | −20°C (freezer) | 24+ months | Best for anything beyond short-term. |
| Lyophilized, sealed | 2-8°C (fridge) | Several months | Fine as a working store. |
| Lyophilized, sealed | Room temperature | Days-weeks | Stable for transit; don’t leave it there. |
| Reconstituted | 2-8°C (fridge) | ~2-4 weeks | Far less stable - refrigerate immediately. |
General guidance for research handling. Specific stability varies by compound - consult your protocol and the lot COA.
Slow, gentle, cold. Five steps stand between a lyophilized cake and a stable working solution.
Let the peptide vial and the bacteriostatic water equilibrate before you start. Cold-shocking the powder is unnecessary stress.
Pull the volume you calculated of bacteriostatic water into a clean syringe. The volume sets your final concentration.
Aim the stream at the inner wall of the vial and let it run down slowly - never blast it directly onto the powder cake.
Roll or swirl gently, or simply wait; the cake dissolves on its own. Shaking foams and shears the peptide.
Mark the date and concentration on the vial and move it to 2-8°C straight away. Reconstituted peptide is on the clock.
A reconstitution & dosing calculator ships in the account tools - it turns your vial size and target dose into a draw volume and U-100 units automatically.