🧊 Best Practices

Storage & Handling

Cold Chain Management · Reconstitution · Stability

Proper storage and handling is essential to preserve peptide integrity and ensure reproducible research results. These guidelines cover temperature requirements, reconstitution protocols, aliquoting strategies, and common handling mistakes that compromise compound stability.

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15–25°C

Short-Term Only

Lyophilised peptides — transit and brief handling only. Never store reconstituted peptides at room temperature

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2–8°C

Refrigerator

Reconstituted peptides in bacteriostatic water — up to 4 weeks with minimal activity loss

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−20°C

Standard Freeze

Lyophilised powder — stable for 12–24 months. Reconstituted aliquots — up to 3 months

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−80°C

Ultra-Low Freeze

Long-term storage of lyophilised powder and reconstituted aliquots — up to 24+ months

Storage Guidelines by Form

Storage requirements differ significantly between lyophilised (freeze-dried) powder and reconstituted solution. Follow guidelines appropriate for the form of your compound.

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Lyophilised Powder

Freeze-dried · Most stable form

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Primary Storage: −20°C or −80°CStore lyophilised powder at -20°C for up to 24 months, or -80°C for extended long-term storage

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Keep DryStore with a desiccant and ensure the container is sealed airtight. Moisture is the primary cause of lyophilised peptide degradation

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Protect from LightStore in amber vials or opaque containers. Many peptides are photosensitive and degrade under UV exposure

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Allow Warm-Up Before OpeningBring refrigerated or frozen vials to room temperature before opening to prevent condensation forming on the powder

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Avoid Repeated Temperature CyclingIf not reconstituting immediately, do not repeatedly move the vial between temperature conditions

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Stability: Up to 24 MonthsMost lyophilised research peptides retain ≥95% activity at −20°C for 12–24 months when stored correctly

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Reconstituted Solution

After addition of solvent · Handle with care

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Store at 2–8°C After ReconstitutionReconstituted peptides are significantly less stable than lyophilised powder. Refrigerate immediately at 2–8°C

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Use Within 4 Weeks (Refrigerated)Reconstituted peptides in bacteriostatic water are typically stable for up to 4 weeks at 2–8°C

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Aliquot Before FreezingIf freezing reconstituted peptide, aliquot into single-use volumes first to avoid repeated freeze-thaw cycles

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Avoid Repeated Freeze-ThawEach freeze-thaw cycle degrades peptide integrity. Use single-use aliquots frozen at −20°C or −80°C

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Inspect Before UseCheck for visible precipitation or discolouration before each use. Do not use if the solution appears cloudy or particulate

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Label with Reconstitution DateAlways mark the date of reconstitution on the vial and discard after the stability window has passed

Reconstitution Protocol

Step-by-step guide · Sterile technique required

Allow Vial to Reach Room Temperature

Remove the lyophilised vial from cold storage and allow it to equilibrate to room temperature for 10–15 minutes before opening. This prevents condensation forming inside the vial on the powder

Prepare Reconstitution Solvent

Use sterile bacteriostatic water (0.9% benzyl alcohol) for most peptides. Use sterile water for injection (WFI) if immediate short-term use is planned. Acetic acid (10–100 mM) may be required for hydrophobic peptides

Add Solvent Slowly — Aim at Vial Wall

Using a sterile syringe and needle, inject the solvent slowly along the inside wall of the vial rather than directly onto the lyophilised cake. This prevents foaming and mechanical disruption of the peptide

Gently Swirl — Do Not Vortex

Gently swirl or roll the vial to encourage dissolution. Do not vortex, shake vigorously, or sonicate, as mechanical shear can cause peptide aggregation and denaturation

Verify Full Dissolution

The solution should be clear and colourless (or faintly coloured for some peptides). If the solution remains turbid, try gentle warming to 37°C or adding a small amount of dilute acetic acid for poorly soluble peptides

Aliquot and Store Appropriately

Dispense into single-use aliquot volumes required for your experimental protocol. Label each aliquot with compound name, concentration, reconstitution date, and initials. Store at 2–8°C (short-term) or −20°C (longer-term)

Peptide Stability Reference Table

Approximate stability windows under different storage conditions

Peptide	Lyophilised −20°C	Lyophilised −80°C	Reconstituted 2–8°C	Reconstituted −20°C	Room Temp
BPC-157	24 months	36+ months	4 weeks	3 months	Avoid
TB-500	24 months	36+ months	4 weeks	3 months	Avoid
CJC-1295	24 months	36+ months	2 weeks	3 months	Avoid
Ipamorelin	24 months	36+ months	4 weeks	3 months	Avoid
Semaglutide	18 months	36+ months	2 weeks	6 weeks	Avoid
GHK-Cu	12 months	24 months	2 weeks	2 months	7 days
MOTS-c	24 months	36+ months	4 weeks	3 months	Avoid
Thymosin Alpha-1	18 months	36+ months	2 weeks	3 months	Avoid

Common Handling Mistakes to Avoid

These are the most frequent causes of peptide degradation in research settings.

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Vortexing After Reconstitution

Vigorous mechanical mixing causes peptide aggregation and structural disruption, reducing biological activity. Always use gentle swirling or rolling motion.

✓ Fix: Gently swirl — never vortex

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Repeated Freeze-Thaw Cycles

Freezing and thawing causes ice crystal damage and concentration gradients that degrade peptide integrity with each cycle. Each cycle can reduce activity by 5–20%.

✓ Fix: Aliquot into single-use volumes before freezing

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Moisture Ingress in Lyophilised Vials

Opening vials in humid environments or before they have reached room temperature allows moisture to enter, initiating hydrolysis and degradation of the lyophilised powder.

✓ Fix: Allow warm-up to room temp before opening

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Exposure to Light

Many peptides — particularly those with aromatic amino acids or disulfide bonds — are photosensitive. Prolonged light exposure can cause photo-oxidation and structural changes.

✓ Fix: Use amber vials and work under subdued lighting

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Using Expired Reconstituted Peptide

Reconstituted peptides have a much shorter shelf life than lyophilised powder. Using old reconstituted stock is a common source of irreproducible results in research.

✓ Fix: Always label with date — discard after stability window

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Using Incompatible Solvents

Some peptides require specific solvents for solubility. Using water alone for hydrophobic peptides, or the wrong pH buffer, results in incomplete dissolution and apparent lower potency.

✓ Fix: Consult CoA solubility data or contact us

Proper Handling Ensures Research Integrity

Following correct storage and handling protocols is essential not only for compound stability but also for the reproducibility and validity of research outcomes. If you have questions about specific compound storage requirements, contact us and reference the batch number from your product label.

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