HANDLING REFERENCE

Store it right, keep it viable

A high-purity peptide is only as good as the way it is kept. Temperature, light and moisture all degrade material over time — often invisibly. This is the general reference our own lab follows for handling lyophilized and reconstituted research peptides.

THREE STATES, THREE RULES

Storage by state

Lyophilized · unopened

−20 °C

Long-term · months to years

Freeze-dried powder is the most stable form. Kept frozen, dark and dry, sealed vials remain viable for extended periods. Cool room temperature is fine for short transit windows.

Reconstituted

2–8 °C

Short-term · days to weeks

Once dissolved, store refrigerated and use within a few weeks. Bacteriostatic water extends the usable window versus sterile or plain water because it inhibits microbial growth.

Extended reconstituted

−20 °C

Aliquot & freeze

To hold a solution longer, split it into single-use aliquots and freeze. This avoids repeated freeze–thaw cycles on the whole batch, which are what actually damage the peptide.

These are general reference ranges, not a spec for a specific compound. Stability varies by peptide — some are notably more fragile than others. Where a product page or its Certificate of Analysis states a compound-specific condition, that always takes precedence over this general guide.

STABILITY AT A GLANCE

Typical stability windows

State	Temperature	Protect from	Typical window
Lyophilized, sealed	−20 °C	Light, moisture	18–36 months
Lyophilized, sealed	2–8 °C	Light, moisture	Several months
Lyophilized, in transit	≤ 25 °C	Prolonged heat	Days (shipping)
Reconstituted (bacteriostatic)	2–8 °C	Light, agitation	2–6 weeks
Reconstituted (sterile/plain)	2–8 °C	Light, microbes	Use promptly
Reconstituted, aliquoted	−20 °C	Freeze–thaw cycles	Extended

General reference figures for laboratory handling. Not compound-specific guidance.

RECONSTITUTION

Dissolving lyophilized powder

Bring both vials to room temperature

Let the peptide vial and your diluent (typically bacteriostatic water) equilibrate. Adding cold solvent to cold powder slows dissolution and encourages condensation.

Add solvent down the vial wall

Introduce the measured diluent slowly, letting it run against the inside glass rather than jetting directly onto the powder. This protects the delicate lyophilized cake.

Swirl — never shake

Gently rotate the vial until fully dissolved. Vigorous shaking introduces shear and foaming that can denature peptides. Give it time; most go into solution within minutes.

Label and refrigerate

Mark the reconstitution date on the vial and store it at 2–8 °C, away from light. Track your dates so you use each solution well inside its stability window.

BEST PRACTICE

Do & don't

Do

Store frozen and in the dark for long-term holding.
Use bacteriostatic water to extend a reconstituted solution's life.
Aliquot before freezing to avoid repeated freeze–thaw.
Label every vial with its reconstitution date.
Keep the desiccant and seal intact until you are ready to use it.

Don't

Shake vigorously or vortex — shear and foam denature peptides.
Leave material at room temperature or in direct light longer than needed.
Repeatedly freeze and thaw the same solution.
Reconstitute more than you will use inside the stability window.
Use a solution that has turned cloudy or thrown visible particulate.

Research use only. This page describes laboratory handling of reference materials. Eon Peptides products are not drugs and are not intended for human or animal consumption, ingestion, or injection. See our Terms & RUO policy.