Can I store peptides at room temperature?

Unreconstituted (lyophilised) peptides can tolerate short periods at room temperature during shipping, but should be stored in a freezer (-20°C) for long-term stability. Reconstituted peptides must always be refrigerated at 2–8°C and should never be left at room temperature.

How long do lyophilised peptides last in the freezer?

Properly stored lyophilised peptides remain stable for 24–36 months at -20°C. Some peptides can last even longer when kept sealed in their original vials away from moisture and light. Always check the manufacturer's expiry date.

Does light damage peptides?

Yes. UV and visible light can degrade certain amino acid residues, particularly tryptophan and tyrosine. Store peptide vials in a dark location or wrap them in aluminium foil. This applies to both lyophilised and reconstituted peptides.

Can I freeze reconstituted peptides?

It is generally not recommended to freeze reconstituted peptides. Freeze-thaw cycles can cause aggregation and loss of potency. If you must store reconstituted peptide long-term, aliquot it into single-use portions before freezing so each portion is only thawed once.

How can I tell if a peptide has degraded?

Signs of degradation include cloudiness, visible particles or floaters in the solution, unusual color changes, or a clumpy appearance in lyophilised powder. A properly reconstituted peptide should be perfectly clear and colorless. Discard any vial that shows these signs.

Shop by goal

Metabolic Signalling

GH-Axis Research

Muscle & IGF Research

Tissue and Cellular Models

Regenerative Research

Cellular Senescence Research

Cognitive Research

Multi-Compound Blends

Popular compounds

Research resources

Certificates of Analysis

How to Store Research Compounds

Proper storage is the difference between a research compound that retains full potency and one that silently degrades into uselessness. Compounds are sensitive to temperature, light, moisture, and mechanical stress. This guide covers exactly how to store them at every stage, from arrival to the last draw.

The two states: lyophilised vs reconstituted

Compounds exist in two fundamentally different storage states, and the rules change significantly between them.

Frozen storage

Shelf life

12–24+ months

Light

Moderate sensitivity

Risk

Moisture absorption

Refrigerated

Shelf life

Up to 30 days

Light

High sensitivity

Risk

Hydrolysis, oxidation, bacteria

Property Lyophilised (powder) Reconstituted (liquid) Optimal temp −20°C (freezer) 2–8°C (refrigerator) Acceptable temp 2–8°C (fridge) for weeks Room temp for hours only Shelf life 12–24+ months (frozen) Up to 30 days (refrigerated) Light sensitivity Moderate High Freeze-thaw safe? Yes (already dry) No, avoid Main degradation risk Moisture absorption Hydrolysis, oxidation, bacteria

Storing lyophilised (unreconstituted) compounds

Lyophilised compounds are freeze-dried into a stable powder form. In this state they're relatively robust, but proper storage still matters.

Temperature

Best: −20°C (freezer) , gold standard. Most compounds retain >95% potency for 24+ months.

Acceptable: 2–8°C (fridge) , suitable if reconstituting within a few weeks. ~5% degradation per year.

Avoid room temperature , brief is fine (shipping, handling); prolonged accelerates degradation.

Light

UV light causes photo-oxidation of tryptophan, tyrosine, and methionine residues. Keep vials in original packaging or an opaque container. A solid-door (not glass) freezer provides inherent light protection.

Moisture

The biggest enemy of lyophilised compounds. The whole point of lyophilisation is to remove water; if it's reabsorbed, degradation reactions restart. Keep crimped caps sealed; for opened vials use parafilm and a sealed container with desiccant packets.

Long-term tips

Use a dedicated freezer bag or container, separate from food.

Label each vial with the date received and compound name.

Avoid the freezer door, temperature fluctuates.

Consider a small dedicated mini-freezer to minimise door-opening.

Shipping note: Compounds shipped at ambient temperature are fine. Lyophilised compounds are stable enough to survive 3–5 days in transit without significant degradation. Once they arrive, move them to the freezer or refrigerator promptly.

Storing reconstituted compounds

Once you add bacteriostatic water to a lyophilised compound, the clock starts ticking. The compound is now dissolved in solution and subject to hydrolysis (water breaking peptide bonds), oxidation, and potential bacterial contamination.

Temperature: 2–8°C only

Refrigerate immediately after reconstitution. Never freeze a reconstituted compound unless aliquoted into single-use portions, and never refreeze a thawed aliquot.

Light protection

Reconstituted compounds are more light-sensitive than their lyophilised form because dissolved peptides are more reactive. Store in a dark area of the fridge, inside the original box, or wrap in aluminium foil.

Shelf life: 30 days

Standard guidance: use within 30 days of reconstitution at 2–8°C in BAC water. Benzyl alcohol inhibits bacterial growth, but doesn't stop chemical degradation.

Handling best practices

Always swab the stopper with alcohol before drawing, every time.

Smallest gauge needle possible (29–31G), minimises stopper hole and air ingress.

Keep upright in the fridge, reduces stopper-solution contact.

Write the reconstitution date on the vial.

Do not freeze reconstituted compounds. Freezing creates ice crystals that physically damage peptide structures and cause aggregation. If you must store long-term, aliquot into single-use portions before freezing, and never refreeze a thawed aliquot.

Stability by compound class

Some compounds are more stable than others in solution.

Stability Examples Reconstituted shelf life High BPC-157, TB-500, GHK-Cu 28–35 days Moderate CJC-1295, Ipamorelin, Semaglutide 21–30 days Lower HGH, IGF-1 LR3, MGF 14–21 days

Signs of degradation

If you notice any of the following, discard the vial.

Cloudiness or turbidity in a previously clear solution, indicates aggregation or bacterial contamination.

Visible particles or floating matter.

Colour change , most peptide solutions are colourless. Yellowing or browning indicates oxidation.

Unusual smell , BAC water has a faint benzyl alcohol scent; foul odours suggest bacterial growth.

Gel formation at the bottom of the vial, some compounds aggregate into gels when degraded.

Quick reference card

Lyophilised

Freezer (−20°C), dark, dry, sealed → 24+ months

Reconstituted

Fridge (2–8°C), dark, BAC water, swab before each use → 30 days

Never

Leave reconstituted vials at room temp, freeze/thaw solutions, or expose to direct light.

Lab-verified compounds, ready to store

All New-U Research Compounds arrive lyophilised and independently verified by Janoshik & Freedom Diagnostics. 10-vial packs, shipped worldwide.

From the Lab - Peptides on LinkedIn & Facebook

Research-grade · >99% HPLC purity · COA per lot

Buy research peptides from New-U Research Compounds

Lab-verified by Janoshik Analytical (RP-HPLC + ESI-MS), sealed vials, discreet tracked worldwide shipping. For laboratory research use only — not for human consumption.

PRECISION. PURITY. PERFORMANCE.

Research peptides at >99% HPLC-verified purity, third-party tested by Janoshik Analytical & Freedom Diagnostics, with Certificates of Analysis published per released batch. Supplied strictly for laboratory research use.

Shop

All research compounds

Price list

Where to buy peptides

Research

Support

Ways to Pay

Shop by goal

Muscle & IGF Research

Tissue and Cellular Models

Regenerative Research

Cellular Senescence Research

Cognitive Research

Multi-Compound Blends

Shop by compound

CJC-1295 (without DAC)

Shop by region

Research use only (RUO). All products are sold strictly for laboratory and research purposes — not for human or veterinary consumption. Purchasers must be 21 or older.

Website & business operated by Hilxera Distribution Services LLC. Registered in Wyoming, ID: 2026-001928701.

Research use only — not for human consumption. All products are supplied strictly for laboratory research purposes.