# Freeze-Dried Peptides and a Perth Summer: What Studies Report on Heat, Light and Water

Updated 2026-10-14.

The sources read on 14 October 2026 give no storage rule or shelf life for this catalogue's research peptides. In a six-month laboratory study of solid human insulin at 6, 25 and 40 °C, deamidation and covalent aggregation rates rose with temperature; the abstract gives no sample number, and the result is for that one protein (Fagan et al., *Journal of Pharmaceutical Sciences*, 2025).

| | |
| --- | --- |
| Format listed | Freeze-dried (this site's home page and about page, read 14 October 2026) |
| Why material is dried | A 2017 literature review of peptide solid-form stabilisation summarises published studies and tested no catalogue product (Zapadka et al., *Interface Focus*, 2017) |
| Certificates against in-house testing | In a laboratory audit of 98 synthetic quorum-sensing peptides (linear peptides made by one supplier and cyclic peptides by another), all 98 came with certificates stating at least 95.0% purity and in-house testing found 43 of 98 met that purity; the finding is for that peptide class and that set only (Verbeke et al., *Journal of Pharmaceutical Analysis*, 2015) |
| Shelf life | Not stated in any source read for this page (14 October 2026) |
| Transit conditions | This site's shipping page (read 14 October 2026) states no transit temperature conditions, so this page claims none |
| Perth summer mean maximum | 29.6 °C Dec, 31.4 °C Jan, 31.7 °C Feb ([Bureau of Meteorology](https://www.bom.gov.au/climate/averages/tables/cw_009225.shtml), Perth Metro 009225, mean over 32 years, 1994 to 2026; page prepared 9 October 2026, retrieved 14 October 2026) |
| TGA statement on unapproved peptide products | 'These products have not been evaluated for safety, quality or effectiveness by the TGA' ([TGA advisory](https://www.tga.gov.au/safety/safety-monitoring-and-information/safety-alerts/understanding-your-responsibilities-when-importing-compounding-and-supplying-unapproved-peptide-products), 13 April 2026); this page decides no product's status |
| Refrigerator test condition in stability guidelines | 5 °C ± 3 °C ([ICH Q1A(R2)](https://database.ich.org/sites/default/files/Q1A%28R2%29%20Guideline.pdf), 6 February 2003; [WHO TRS 1010 Annex 10](https://www.who.int/publications/m/item/trs1010-annex10), 2018) |
| Freezer test condition in stability guidelines | -20 °C ± 5 °C (ICH Q1A(R2), 2003; WHO TRS 1010 Annex 10, 2018) |
| Domestic and bar fridges | Described as 'not built or designed to store vaccines' ([Strive for 5](https://www.health.gov.au/resources/publications/national-vaccine-storage-guidelines-strive-for-5), 4th edition, September 2025); the sources read contain no peptide-specific statement |
| Sources read | 14 October 2026 |

This page reports what published studies, [WHO Technical Report Series 1010, Annex 10](https://www.who.int/publications/m/item/trs1010-annex10) (30 September 2018), [ICH Q1A(R2)](https://database.ich.org/sites/default/files/Q1A%28R2%29%20Guideline.pdf) (step 4 version dated 6 February 2003) and the [FDA briefing document on BPC-157](https://www.fda.gov/media/193343/download) (dated 11 May 2026, for the 23-24 July 2026 advisory committee meeting) record about heat, light and water in freeze-dried peptides. It sets that beside Perth's summer air temperatures from the [Bureau of Meteorology's Perth Metro climate statistics](https://www.bom.gov.au/climate/averages/tables/cw_009225.shtml) (retrieved 14 October 2026). It is the storage-science spoke of [the Perth research peptides hub](/learn/peptides-perth). It reports sources and does not tell any reader what to do with a vial. Freeze-dried (lyophilised) means dried from the frozen state.

The subject is deliberately narrow: what the literature records about freeze-dried peptide material, in a city with the summer air temperatures listed below. Delivery has its own pages in this cluster. This site's shipping page, read on 14 October 2026, gives no transit temperature conditions, so this page makes no claim about the journey. What can be reported is why the material is dried, what heat, light and water each did in named studies, and which temperature bands the WHO, ICH, FDA and Australian vaccine-guideline documents describe. All sources were read on 14 October 2026.

## Why are research peptides supplied freeze-dried?

The literature review of peptide solid-form stabilisation by Zapadka et al. (*Interface Focus*, 2017) describes freeze drying as a common way to prepare solid peptides; it summarises published studies and tested no catalogue product. This site's home page and about page, read on 14 October 2026, describe the compounds as supplied freeze-dried.

Thiol-disulfide exchange is a reaction in which a molecule's sulfur bridges rearrange. In a laboratory study of peptides corresponding to tryptic fragments of human growth hormone, held as lyophilised powders at 22 °C and ambient relative humidity, thiol-disulfide exchange occurred in the solid state with reaction rates and product distribution that differed from those in aqueous solution; the study used fragment peptides and not finished products, and the abstract reports no sample size (Chandrasekhar and Topp, *Journal of Pharmaceutical Sciences*, 2015).

The two sources address different questions. The literature review summarises published work on solid-form stabilisation (Zapadka et al., 2017), and the laboratory study followed one reaction in fragment peptides (Chandrasekhar and Topp, 2015). Neither measured a product from this catalogue.

## What can no storage page tell you about a specific vial?

No page, including this one, can state the present condition of a specific vial. In a laboratory audit of 98 synthetic quorum-sensing peptides (linear peptides made by one supplier and cyclic peptides by another), in-house testing found that only 43 of the 98 met the requested purity of at least 95.0%, although all 98 came with certificates of analysis stating at least 95.0% purity; the finding is for that peptide class and that set only (Verbeke et al., *Journal of Pharmaceutical Analysis*, 2015). The studies read for this page did not test the material in this catalogue, and no source read states a shelf life for it. The TGA says the unapproved peptide products promoted online 'have not been evaluated for safety, quality or effectiveness by the TGA' ([TGA advisory](https://www.tga.gov.au/safety/safety-monitoring-and-information/safety-alerts/understanding-your-responsibilities-when-importing-compounding-and-supplying-unapproved-peptide-products), 13 April 2026).

The 2015 audit by Verbeke et al. covered one peptide class and one set of 98 peptides, and it does not show how often certificate and test results differ elsewhere. A certificate of analysis reports on the lot it was issued for. [What a batch or lot number lets a researcher verify](/learn/peptide-quality-verification/what-a-batch-or-lot-number-lets-a-researcher-verify) sets out the chain from number to report, and the wider [peptide quality and verification](/learn/peptide-quality-verification) pages cover that machinery in full.

## What do heat and light actually do to peptide material?

The studies cited here do not establish a heat or light rule for peptides as a class. In a six-month laboratory study of solid human insulin at 6 °C, 25 °C and 40 °C, deamidation and covalent aggregation were the main degradation pathways and their rates rose with temperature; the abstract gives no sample number, and the result covers one protein in one solid form, rather than any catalogue compound (Fagan et al., *Journal of Pharmaceutical Sciences*, 2025).

In a separate laboratory study, near-ultraviolet and visible light acting on citrate buffer with iron present induced cleavage of peptide and protein disulfide bonds; the abstract gives no sample number, and the result is for that solution system and not for a dry powder (Prajapati et al., *Journal of Pharmaceutical Sciences*, 2022).

Deamidation is the loss of an amide group from an amino acid side chain, and covalent aggregation is the bonding of molecules into larger clusters. The [Bureau of Meteorology's climate statistics for Perth Metro](https://www.bom.gov.au/climate/averages/tables/cw_009225.shtml) (site 009225, mean maximum temperature over 32 years, 1994 to 2026) give a mean maximum air temperature of 29.6 °C in December, 31.4 °C in January and 31.7 °C in February, against an annual mean maximum of 24.9 °C (page prepared 9 October 2026, retrieved 14 October 2026). These are weather-station air temperatures. They say nothing about the temperature of any parcel or vial.

In a laboratory photostability study of the protein somatropin, light exposure altered quality attributes of the lyophilised, reconstituted and diluted forms, with more pronounced effects on the liquid forms; the abstract gives no sample numbers, and this single-protein experiment does not establish outcomes for catalogue peptides (Pritts et al., *Pharmaceutical Research*, 2026).

## Why does water content matter in a dried powder?

The studies cited here do not set one water-content rule for dried peptides. In a laboratory thermal-stress study of solid semaglutide, thermal analysis detected residual water loss; the abstract gives no sample number, and the finding covers that one molecule under thermal stress (Akbar et al., *Pharmaceutical Research*, 2026).

A 2023 report on how peptide reference standards are produced and characterised, which uses case studies and not a survey of commercial lots, describes assigning a value to a bulk peptide by a mass balance approach: all species other than the native peptide, such as impurities and counter ions, are identified and measured, and tests for residual solvents, residue on ignition and moisture are part of the work (McCarthy et al., *Pharmaceutical Research*, 2023). Separately, a laboratory thermal-stress study of solid semaglutide only, with no sample number in the abstract, detected loss of residual water from the solid by thermal analysis (Akbar et al., 2026). Neither study measured a product from this catalogue.

## Why are peptides stored in a refrigerator?

No source read for this page gives one reason that covers peptides as a class. Stability studies of single molecules compare material across temperatures. In a six-month laboratory study of solid human insulin, deamidation and covalent aggregation rates rose with temperature; the finding covers that one protein and the abstract gives no sample number (Fagan et al., *Journal of Pharmaceutical Sciences*, 2025). In a laboratory study of solid semaglutide under thermal stress, chromatography and mass spectrometry showed temperature-dependent degradation and impurity formation; the abstract gives no sample numbers, and the finding covers that one molecule under thermal stress (Akbar et al., *Pharmaceutical Research*, 2026).

Zapadka et al. (2017) discuss the limits of extrapolating aggregation measurements between temperatures in a literature review; they did not test catalogue products. The review appeared in *Interface Focus*.

## What do WHO and ICH guidelines say about refrigerating peptides?

Neither guideline names a peptide. Both define the refrigerator and the freezer as stability-test conditions for medicines: 5 °C ± 3 °C for the refrigerator and -20 °C ± 5 °C for the freezer ([ICH Q1A(R2)](https://database.ich.org/sites/default/files/Q1A%28R2%29%20Guideline.pdf), step 4 version dated 6 February 2003; [WHO Technical Report Series 1010, Annex 10](https://www.who.int/publications/m/item/trs1010-annex10), 30 September 2018). Both are registration guidelines for medicines: they describe the stability data a maker supplies in support of a label statement. They are not studies of research material and do not examine any lot in this catalogue.

ICH Q1A(R2) states that it addresses registration applications for new molecular entities and associated drug products, and points to a separate guideline, Q5C, for biotechnological and biological products. For drug substances intended for storage in a refrigerator, section 2.1.7.2 sets a long-term study at 5 °C ± 3 °C with 12 months of data at submission, and an accelerated study at 25 °C ± 2 °C and 60% relative humidity ± 5% for 6 months. WHO's annex states that its guidance was first published as Annex 2 of Technical Report Series 953 (2009), and says it may generally apply to the stability testing of biologicals, with additional requirements in ICH Q5C. Its Appendix 2 table pairs the condition under which a finished product's stability was demonstrated with a label statement, and lists three such conditions: 5 °C ± 3 °C, -20 °C ± 5 °C, and 25 °C with 60% relative humidity, long-term. The refrigerator is one rung on a ladder of conditions.

Both texts describe how a maker supports a label statement for its own product. Neither sets one for research material.

## What do FDA documents say about storing peptide medicines and compounded peptides?

The two FDA documents read for this page give storage statements product by product and not as one rule for peptides. The label for EGRIFTA SV (tesamorelin) on [DailyMed](https://dailymed.nlm.nih.gov/dailymed/lookup.cfm?setid=3d783378-b02d-4f19-99dd-0fc91a042224) (record updated 29 July 2026) has its own section 16, 'How supplied/storage and handling', which describes the product as a lyophilised powder in a single-dose vial. The Egrifta SV label contains product-specific storage information; this page does not reproduce those directions. The FDA's [briefing document on BPC-157](https://www.fda.gov/media/193343/download), dated 11 May 2026 and prepared for the 23-24 July 2026 Pharmacy Compounding Advisory Committee meeting, reports storage statements for lyophilised and dissolved BPC-157 that cite two supplier web pages (footnotes 14 and 15, accessed 26 June 2024).

The briefing document's storage statements for BPC-157 rest on two supplier web pages and are not an FDA measurement of any product. The FDA briefing warns that formulation, manufacturing and environmental conditions can affect peptide stability; this warning cites a literature review rather than a product test (FDA, 11 May 2026; Zapadka et al., 2017).

The label statement applies to one approved product and the briefing document concerns one compound, so neither establishes storage conditions for a product or lot sold in this catalogue. This page makes no claim beyond those two documents.

## Do sources place peptides in the refrigerator or the freezer?

Published sources name both bands, for different purposes. Stability guidelines define a refrigerator test condition of 5 °C ± 3 °C and a freezer test condition of -20 °C ± 5 °C (ICH Q1A(R2), 6 February 2003; WHO TRS 1010 Annex 10, 30 September 2018). The studies read for this page did not compare the two bands for the compounds in this catalogue, and this page does not rank one band above the other.

The freezer band carries its own evidence rule. For a drug product intended for a freezer, ICH Q1A(R2) section 2.2.7.5 says the shelf life 'should be based on the real time data obtained at the long term storage condition'. Where there is no accelerated condition for such a product, it says testing 'on a single batch at an elevated temperature (e.g., 5°C ± 3°C or 25°C ± 2°C) for an appropriate time period should be conducted to address the effect of short term excursions outside the proposed label storage condition'. A freezer condition is therefore a tested condition tied to a product's own data.

No single band is reported as best across the sources read. Lot-level information sits in the lab report, and [how to read a certificate of analysis](/learn/peptide-quality-verification/how-to-read-a-certificate-of-analysis) covers that paperwork.

## Can a mini fridge store peptides?

No source read for this page says whether a mini fridge suits peptide material. The closest official Australian document, the [Strive for 5 national vaccine storage guidelines](https://www.health.gov.au/resources/publications/national-vaccine-storage-guidelines-strive-for-5) (4th edition, Australian Government Department of Health, Disability and Ageing, September 2025), records a risk of vaccine freezing in domestic refrigerators, including bar fridges. It contains no peptide-specific finding, so it is a reference point and not a result for peptides, and the studies read measured no peptide material in a mini fridge.

The guidelines name freezing as the risk for vaccines in such fridges. No source read for this page names a model or brand of mini fridge, and this page names none.

## What does this page deliberately not cover?

Transit. The sources read for this page did not state the conditions a parcel experiences on the road. This site's shipping page, read on 14 October 2026, gives dispatch carriers, delivery windows and packaging appearance, and no temperature or handling conditions, so this page claims none. That is the page's defined edge and not a gap: the journey belongs to the delivery pages, and [Perth peptide delivery times by state](/learn/peptides-perth/perth-peptide-delivery-times-by-state) covers delivery windows. Shelf life is the other absence: none is stated in the sources read, and the record for any batch is its own lab report.

The journey belongs to the delivery pages in [the wider Perth peptides hub](/learn/peptides-perth). What is documented here is the literature on freeze-dried material, dated and sourced.

## Comparison

One row per topic, with the named study or official document inside every cell. None of these sources reports testing of a product or lot sold in this catalogue. Each finding belongs to the molecule, product or document named beside it, and nothing here is a class-wide rule, a rate, or a shelf life.

| Topic | What the named source reports | Material the source covers |
| --- | --- | --- |
| Temperature | In a six-month laboratory study of solid human insulin held at 6 °C, 25 °C and 40 °C, deamidation and covalent aggregation were the main pathways and their rates rose with temperature; the abstract gives no sample number, and the result is for one protein in one solid form (Fagan et al., 2025, *Journal of Pharmaceutical Sciences*) | Human insulin, held as a solid (Fagan et al., 2025) |
| Moisture | In the six-month laboratory study of solid human insulin, the humidity effect was temperature dependent, with moisture-induced degradation minimal at 25 °C and 40 °C and an important factor at 60 °C; the abstract gives no sample number, and the result is for one protein (Fagan et al., 2025) | Human insulin (Fagan et al., 2025) |
| Light | In a laboratory photostability study of the protein somatropin, light exposure altered quality attributes of the lyophilised, reconstituted and diluted forms, with more pronounced effects on the liquid forms; the abstract gives no sample numbers, and this single-protein experiment does not establish outcomes for catalogue peptides (Pritts et al., *Pharmaceutical Research*, 2026) | The protein somatropin, rather than one of this catalogue's research compounds (Pritts et al., 2026) |
| Refrigerator and freezer test conditions | The refrigerator test condition is 5 °C ± 3 °C and the freezer test condition is -20 °C ± 5 °C; WHO pairs the conditions under which a finished product's stability was demonstrated with recommended label statements (ICH Q1A(R2), 6 February 2003; WHO TRS 1010 Annex 10, 30 September 2018) | Drug substances and medicines in general; neither document names a peptide |
| FDA statements on BPC-157 | Peptides such as BPC-157 (free base) can be extremely sensitive to formulation, process and environmental conditions including heat, as a regulator's summary citing a literature review; its storage statements for lyophilised and dissolved BPC-157 cite two supplier web pages (FDA briefing document dated 11 May 2026; Zapadka et al., 2017) | Peptides in general and BPC-157, as stated by the FDA; no measurement of any product |
| Domestic and bar fridges | Not built or designed to store vaccines, because of a propensity to freeze them (Strive for 5, 4th edition, Australian Government Department of Health, Disability and Ageing, September 2025) | Vaccines; no peptide material was tested |

## Frequently asked questions

### How should peptides be stored?

The sources read for this page give no storage rule for the research peptides in this catalogue, and this page gives none. The sources record other facts. Degradation rates rose with temperature in a six-month laboratory study of solid human insulin, a result for that one protein with no sample number in the abstract (Fagan et al., 2025). ICH and WHO guidelines define refrigerator and freezer test conditions for medicines. No page can report what a specific vial is like now, and the lab report for a lot is the record for that batch.

### Do peptides go off in the heat?

Published work reports temperature effects molecule by molecule, not as a class rule. In a six-month laboratory study of solid human insulin, deamidation and covalent aggregation rates rose with temperature; the abstract gives no sample number, and the finding covers that one protein (Fagan et al., 2025). In a laboratory study of solid semaglutide under thermal stress, chromatography and mass spectrometry showed temperature-dependent degradation and impurity formation; the abstract gives no sample numbers, and the finding covers that one molecule under thermal stress (Akbar et al., 2026).

### Why are research peptides freeze-dried?

A 2017 literature review of solid-form stabilisation of peptides reports that lyophilisation and freeze drying are frequently used to prepare peptides in a solid state; the review summarises published studies and did not test any catalogue product (Zapadka et al., *Interface Focus*, 2017). This site's home page and about page, read on 14 October 2026, describe the compounds as supplied freeze-dried.

### How long do freeze-dried peptides last?

No source read for this page states a shelf life for the research peptides in this catalogue, and the studies read did not test them. In a laboratory audit of 98 synthetic quorum-sensing peptides (linear peptides made by one supplier and cyclic peptides by another), in-house testing found that only 43 met the requested purity of at least 95.0%, although all 98 came with certificates stating at least 95.0% purity; the finding is for that peptide class and that set only (Verbeke et al., 2015, *Journal of Pharmaceutical Analysis*).

### Are peptides shipped cold?

This site's shipping page, read on 14 October 2026, gives dispatch carriers, delivery windows and packaging appearance, and states no transit temperature condition, so none is claimed here. This page covers the literature on freeze-dried material and not the journey.

### Is there a mini fridge that can store peptides?

No source read for this page names a mini fridge as suitable for peptide material. The Strive for 5 vaccine guidelines (4th edition, September 2025) state that domestic refrigerators, including bar fridges, are not built or designed to store vaccines, and the studies read measured no peptide material in one.

## Citations

- Verbeke F et al.. Journal of Pharmaceutical Analysis. 2015;5(3):169-181. DOI: 10.1016/j.jpha.2014.12.002
- McCarthy D et al.. Pharmaceutical Research. 2023;40(6):1317-1328. DOI: 10.1007/s11095-023-03493-1
- Fagan A et al.. Journal of Pharmaceutical Sciences. 2025;114(2):1368-1375. DOI: 10.1016/j.xphs.2024.11.032
- Akbar S et al.. Pharmaceutical Research. 2026;43(5):1579-1597. DOI: 10.1007/s11095-026-04094-4
- Chandrasekhar S, Topp EM. Journal of Pharmaceutical Sciences. 2015;104(4):1291-1302. DOI: 10.1002/jps.24370
- Prajapati I et al.. Journal of Pharmaceutical Sciences. 2022;111(4):991-1003. DOI: 10.1016/j.xphs.2022.01.026
- Pritts JD et al.. Pharmaceutical Research. 2026;43:185-193. DOI: 10.1007/s11095-025-03986-1
- Zapadka KL et al.. Interface Focus. 2017;7(6):20170030. DOI: 10.1098/rsfs.2017.0030

[Research compound catalogue - freeze-dried reference material](/shop)

[More on peptide quality and verification](/learn/peptide-quality-verification)

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