How to Reconstitute & Store Peptides: Fridge, Cupboard and Shelf Life Guide

Getting the most out of research peptides comes down to more than just the compound itself — how you reconstitute, store and handle it plays a huge role in maintaining purity and stability. Peptides are delicate molecules. Heat, light, moisture and rough handling can all cause degradation before you even begin your protocol.

This guide covers every Cronopharm product family — lyophilised vials, pre-filled pens, nasal sprays and bacteriostatic water — with clear answers on what goes in the fridge, what belongs in a dark cupboard, and how long each product lasts after reconstitution.

Why Storage and Handling Matter

Peptides are short chains of amino acids held together by peptide bonds — bonds that are sensitive to their environment. The three biggest enemies of peptide stability are:

• Heat: Elevated temperatures accelerate hydrolysis and structural breakdown.
• Light (especially UV): Photo-degradation can alter the peptide’s structure and activity.
• Moisture & contamination: Humidity and microbial contamination degrade the product and compromise sterility.

Proper handling protects the research value of your product and ensures consistent, reproducible results across your protocol.

The Golden Rules of Peptide Handling

1. Keep vials sealed until use. Lyophilised peptides are stable for extended periods while sealed under vacuum.
2. Equilibrate to room temperature before reconstituting. Taking a vial straight from the fridge and adding water can introduce condensation.
3. Never shake a reconstituted vial. Shaking creates bubbles and mechanical stress that can denature the peptide. Gently swirl or roll instead.
4. Use sterile technique. Wipe stoppers with an alcohol swab and let them dry before piercing.
5. Inject water down the vial wall. Never aim the water stream directly at the lyophilised cake.
6. Keep everything cool after mixing. Reconstituted peptides belong in the fridge (2–8°C), not on the counter.
7. Mark the reconstitution date. Always label the vial with the date you mixed it so you know when it expires.

Reconstitution: Step-by-Step (Lyophilised Vials)

All Cronopharm vial products arrive as lyophilised (freeze-dried) powder unless stated otherwise, and require reconstitution with Bacteriostatic Water before research use.

1. Prep your workspace. Clean, dry, well-lit surface. Gather alcohol swabs, a sterile syringe, and your Bacteriostatic Water.
2. Equilibrate. Allow both the peptide vial and the Bacteriostatic Water to reach room temperature (15–25°C) before starting.
3. Sanitise. Wipe the rubber stopper of both vials with an alcohol swab and allow them to air-dry.
4. Draw the water. Using a sterile syringe, draw the required volume of Bacteriostatic Water.
5. Transfer slowly. Insert the needle through the stopper and inject the water slowly down the inside wall of the vial — do not aim directly at the powder.
6. Dissolve gently. Remove the syringe and gently swirl or roll the vial until the powder is fully dissolved. Do not shake.
7. Inspect. The reconstituted solution should be clear and free of particles. If it is cloudy, discoloured or contains visible matter, do not use it.
8. Refrigerate immediately. Store at 2–8°C and use within the recommended period below.

Note: Pre-filled pens and nasal sprays are supplied ready to use. All vial products — including Cerebrolysin — require reconstitution with Bacteriostatic Water.

Fridge vs Dark Cupboard: Where Each Product Belongs

There is a common misconception that all peptides must live in the fridge. In reality, lyophilised powders are often best kept in a cool, dark, dry place — refrigeration can introduce condensation every time the vial warms up. The table below shows exactly where each Cronopharm product should be stored.

Lyophilised Vials — Dark Cupboard (15–25°C)

Store sealed, in a cool dry place away from direct sunlight, heat sources and humidity. A closed kitchen cupboard or drawer works well. Refrigeration is not required for the dry powder, but if your environment is very warm (above 25°C), the fridge is an acceptable alternative — just always allow the vial to warm to room temperature before opening to avoid condensation.

• Tirz 30mg
• SemaG 6mg
• Reta 32mg
• Cagrilin 6mg
• Cagritrutide 36mg
• Cagrisema 12mg
• Tesamorelin 10mg & 20mg
• MOTS-c 40mg
• Semax 10mg
• AOD 9604 5mg
• CJC 1295 no DAC 5mg
• CJC no DAC + Ipamorelin
• BPC 157 10mg
• TB 500 10mg
• Adamax 5mg
• DSIP 10mg
• GHK-CU 100mg
• Melanotan I 10mg & Melanotan II 10mg
• Glutathione 1500mg
• PT-141 10mg
• KLOW 80mg
• NAD+ 500mg
• KPV 10mg
• Cerebrolysin 60mg
• Selank + Semax
• SS-31 10mg

Pre-Filled Pens — Fridge (2–8°C)

All Cronopharm pre-filled pens (Tirz, SemaG, Reta, Cagrilin, Cagritrutide, Cagrisema) contain a ready-to-use sterile solution and must be refrigerated at 2–8°C at all times. Keep them in the main body of the fridge (not the door, where temperature fluctuates) and away from the freezer compartment.

• Never freeze — freezing can damage the peptide structure and the pen mechanism.
• Protect from light — keep the pen in its packaging when not in use.
• Use by the expiry date printed on the pen packaging.

Nasal Sprays — Fridge After Opening (2–8°C)

The Cronopharm nasal spray range (Adamax, Semax, PT-141, Selank + Semax) is supplied as a ready-to-use solution. Once opened, store the spray upright in the fridge at 2–8°C. Unopened sprays may be stored in a cool, dark cupboard until first use.

Bacteriostatic Water — Dark Cupboard (15–25°C)

Bacteriostatic Water contains 0.9% benzyl alcohol, which keeps the solution stable at room temperature. Store in a dark cupboard away from heat. Once the vial is first pierced, use within 28 days and discard any remainder.

How Long Each Product Lasts After Reconstitution

The following periods are general stability guidelines for refrigerated (2–8°C) storage of reconstituted peptides using Bacteriostatic Water. Always follow your research protocol, and discard any solution that becomes cloudy, discoloured, or develops visible particles — regardless of the date.

Product	Storage After Reconstitution	Recommended Use Period
Tirz, SemaG, Reta, Cagrilin, Cagritrutide, Cagrisema (vials)	Fridge 2–8°C	Up to 28 days
Tesamorelin 10mg / 20mg	Fridge 2–8°C	Up to 14 days (use promptly)
MOTS-c 40mg	Fridge 2–8°C	Up to 28 days
Semax 10mg	Fridge 2–8°C	Up to 28 days
NAD+ 500mg	Fridge 2–8°C	7–14 days (highly sensitive to degradation)
AOD 9604 5mg	Fridge 2–8°C	Up to 28 days
CJC 1295 no DAC 5mg	Fridge 2–8°C	Up to 21 days
CJC no DAC + Ipamorelin	Fridge 2–8°C	Up to 21 days
BPC 157 10mg	Fridge 2–8°C	Up to 28 days
TB 500 10mg	Fridge 2–8°C	Up to 28 days
Adamax 5mg	Fridge 2–8°C	Up to 28 days
DSIP 10mg	Fridge 2–8°C	Up to 28 days
GHK-CU 100mg	Fridge 2–8°C	Up to 30 days
Melanotan I & II 10mg	Fridge 2–8°C	Up to 30 days
Glutathione 1500mg	Fridge 2–8°C	Up to 14 days
PT-141 10mg	Fridge 2–8°C	Up to 28 days
KLOW 80mg	Fridge 2–8°C	Up to 28 days
KPV 10mg	Fridge 2–8°C	Up to 28 days
Selank + Semax	Fridge 2–8°C	Up to 28 days
SS-31 10mg	Fridge 2–8°C	Up to 28 days
Cerebrolysin 60mg (lyophilised vial)	Fridge 2–8°C	Up to 28 days
Pre-filled pens (all)	Fridge 2–8°C	Use by the expiry date on the packaging
Nasal sprays (all)	Fridge 2–8°C after opening	Use within 30 days of first use
Bacteriostatic Water	Dark cupboard, room temp	28 days after first piercing

Long-Term Storage of Unreconstituted Vials

Sealed lyophilised vials stored correctly (dark, dry, 15–25°C) typically remain stable for 12–24 months from the manufacture date. Always check the expiry date printed on the vial and packaging. If you plan to store vials long-term, keep them in their original packaging in a consistent environment — avoid attics, garages and bathrooms where temperature and humidity fluctuate.

Common Storage Mistakes to Avoid

• Storing reconstituted peptides at room temperature — degrades potency within days.
• Freezing reconstituted solutions — ice crystals can damage the peptide structure.
• Repeatedly warming and cooling the same vial — condensation introduces moisture and contamination risk.
• Leaving pens or sprays in direct sunlight — UV degrades peptide solutions quickly.
• Keeping vials in the fridge door — temperature swings every time the door opens.
• Reusing needles or failing to swab stoppers — contamination shortens usable life.

Frequently Asked Questions

Should I put my peptide powder in the fridge?

Not necessarily. Lyophilised powder is stable in a cool, dark cupboard (15–25°C). Refrigeration is optional unless your environment is very warm — if you do refrigerate, always let the vial return to room temperature before opening to prevent condensation inside the vial.

Why do my pre-filled pens need to be refrigerated but my vials don’t?

Pre-filled pens contain peptides already dissolved in liquid, and dissolved peptides degrade faster than dry lyophilised powder. The liquid format requires constant refrigeration (2–8°C) to maintain stability.

How do I know if my reconstituted peptide has gone bad?

Cloudiness, discolouration, visible particles, or a change in smell are all signs of degradation or contamination. When in doubt, discard — never use a compromised solution.

Can I freeze Bacteriostatic Water?

No. Freezing can damage the vial and alter the preservative solution. Store it in a dark cupboard at room temperature.

How long can I keep an opened nasal spray?

Once opened, refrigerate the spray and use it within 30 days to maintain stability and hygiene.

Shipping and Cold Chain

Every Cronopharm order is packed with care. Vials ship as sealed lyophilised powder in protective packaging, and temperature-sensitive items are dispatched to arrive quickly so your products are in the best possible condition. If you have questions about the condition of an order on arrival, contact info@cronopharm.co.za within 48 hours with photos.

This guide is provided for research and educational purposes only. All Cronopharm products are intended for laboratory research use only and are not intended for human or animal consumption, diagnosis, treatment, or cure of any disease. Always follow your institution’s guidelines and your research protocol.