Learn · Research use only
How to Store Lyophilized Peptides in the Laboratory
Storage and handling principles for lyophilized peptides (freeze-dried peptide powder), drawn from the peer-reviewed stability literature and our own safety data sheets. Written for laboratory staff.
Lyophilized peptides are supplied as a dry powder because removing water slows the chemistry that degrades them. Dry is not permanent, though: temperature, moisture, light and the container all affect how long a lot stays within specification. This guide covers storage and handling of the sealed powder as laboratory material only. Nothing here is guidance for use in people.
What lyophilization does
Lyophilization, or freeze-drying, is the most commonly used method for preparing solid protein pharmaceuticals[1]. A freeze-drying process has three stages: freezing, primary drying, in which ice is removed under vacuum, and secondary drying, which removes much of the remaining bound water[2]. Catalog peptides such as BPC-157 are supplied in this lyophilized form[3].
Why dry powder still degrades
Peptides and proteins are often formulated as solids to stabilize them during storage, but the solid state slows degradation rather than stopping it[4]. A review of solid-state stability lists the main reactions that still occur: deamidation, peptide-bond cleavage, oxidation, the Maillard reaction, beta-elimination, and dimerization or aggregation[4]. The same review names the factors that drive them: temperature, moisture content, excipients and the physical state of the solid, amorphous or crystalline[4].
Temperature
Temperature is the factor a lab controls most directly. In a study of a lyophilized antibody formulation stored at temperatures from 5 °C to 50 °C for 6 or 12 months, all formulations were stable at 5 °C, and degradation during storage in the glassy state followed Arrhenius kinetics, meaning reaction rates rose with temperature in a predictable way[5]. The same study measured each formulation's glass transition temperature (Tg) and found it fell from about 80 °C at 1% moisture to about 25 °C at 8% moisture[5]. Moisture and temperature therefore act together.
For catalog material, the storage condition on the lot's own documentation is the one to follow. Our BPC-157 safety data sheet, for example, says to store the lyophilized material at 2–8 °C or below, protected from light, and only in the original sealed vial; it describes the material as stable under recommended storage conditions (lyophilized, frozen, desiccated)[3].
Moisture: keep the powder dry
Moisture comes up repeatedly in the stability literature. Moisture content is one of the main factors that drive solid-state reactions in peptides and proteins[4]. In the antibody study above, high moisture levels decreased chemical stability whether the solid was in a glassy or a rubbery state, and high-moisture samples showed faster aspartate isomerization at elevated temperatures[5]. These are model proteins, not catalog peptides, but the mechanism is general: once a dry solid takes up water, chemical degradation can speed up.
Our safety data sheets say to protect from light and moisture, and to store only in the original sealed vial[3]. Desiccant in a sealed secondary container, or a desiccator, is the usual way labs keep the surrounding air dry.
Light
A review of photodegradation identifies tryptophan, tyrosine, phenylalanine and cysteine/cystine as the residues in proteins that undergo primary photooxidation[6]. The authors note that photodegradation can change primary, secondary and tertiary structure, and that such changes could affect long-term stability[6]. Keeping the sealed vial in its carton or an opaque secondary container, in dark storage, limits exposure.
Opening a vial: let it warm up sealed
A vial taken straight from cold storage is colder than the room, so moisture in the air condenses on cold surfaces. General laboratory practice is to let the closed vial reach room temperature before opening it, so that condensation forms on the outside of the vial rather than on the powder, then to keep the vial open only briefly and reseal it promptly.
The container matters
Our safety data sheets specify storage in the original sealed vial[3]. Regulated manufacturing also counts the container as part of the stability picture: ICH Q7 says stability samples should be stored in containers that simulate the market container[7]. The SDS also lists incompatibilities (strong oxidizing agents, strong acids and bases), which is a reason to store peptide vials apart from those chemicals[3].
How long do lyophilized peptides last?
There is no general shelf life for lyophilized peptides. Stability depends on the sequence, the formulation, residual moisture and storage temperature, and even a well-lyophilized solid may have limited long-term storage stability[1]. In regulated manufacturing, appropriate storage conditions and retest or expiry dates are confirmed by a documented, ongoing stability-testing program, not by a general rule[7]. For research material, rely on the storage condition and any retest or expiry date on the lot's own documentation. Our article on what a certificate of analysis is explains what those documents contain.
Lot records
A certificate from a different lot says nothing about the vial in your freezer. Records should connect the two:
- Lot number from the vial label, matched to the COA and packing slip.
- Date received, package condition, storage location and temperature.
- Opening dates, so exposures are known.
- Documents on file: the lot COA and the SDS. Lot COAs are available on request and are being added to our COA library. Safety data sheets are in the SDS library, and our guide on how to read lot documents walks through each COA field.
How to store peptides: a checklist
- Store at the condition stated on the lot documentation (for our BPC-157: 2–8 °C or below, sealed, protected from light).
- Keep vials in the original sealed container, with desiccant or in a desiccator.
- Protect from light: keep the sealed vial in its carton or an opaque secondary container, in dark storage.
- Let a cold vial reach room temperature, still closed, before opening; reseal promptly.
- Limit the number of times a vial leaves cold storage.
- Store apart from strong oxidizers, acids and bases.
- Handle material under your institution's chemical hygiene plan, the written program of procedures, equipment and work practices as defined in OSHA's laboratory standard[8].
Catalog examples: BPC-157 and TB-500. Background: what peptides are.
Frequently asked questions
Do peptides need to be refrigerated?
In lyophilized form, cold storage is standard. Our BPC-157 safety data sheet states 2-8 °C or below, in the original sealed vial, protected from light. Follow the storage condition on the documentation for your lot.
How long do peptides last in lyophilized form?
There is no general figure. Stability depends on sequence, formulation, moisture and temperature. Rely on the storage condition and any retest or expiry date on the lot documentation.
Can BPC-157 be stored frozen?
Our BPC-157 safety data sheet states 2-8 °C or below and describes the material as stable under recommended storage conditions (lyophilized, frozen, desiccated), so frozen storage of the sealed vial is within its stated condition. Storage conditions differ by compound, so follow the SDS for each product.
Does opening the vial affect stability?
It can. Each opening exposes the powder to room air and its moisture. Let a cold vial reach room temperature while closed, open it briefly and reseal it promptly.
Why protect lyophilized peptides from light?
Tryptophan, tyrosine, phenylalanine and cysteine residues can undergo photooxidation. Keeping the sealed vial in its carton or an opaque secondary container, in dark storage, limits exposure.
For laboratory research use only. Not for human or veterinary use. Not a drug, food, cosmetic or dietary supplement.
References
- Wang W. Lyophilization and development of solid protein pharmaceuticals. Int J Pharm. 2000;203(1-2):1–60. doi:10.1016/s0378-5173(00)00423-3. PMID 10967427. pubmed.ncbi.nlm.nih.gov/10967427
- Tang X, Pikal MJ. Design of freeze-drying processes for pharmaceuticals: practical advice. Pharm Res. 2004;21(2):191–200. doi:10.1023/b:pham.0000016234.73023.75. PMID 15032301. pubmed.ncbi.nlm.nih.gov/15032301
- BioLabs Research. BPC-157 Safety Data Sheet, version 1.1, 8 October 2026, Sections 7 and 10. biolabsresearch.co/sds
- Lai MC, Topp EM. Solid-state chemical stability of proteins and peptides. J Pharm Sci. 1999;88(5):489–500. doi:10.1021/js980374e. PMID 10229638. pubmed.ncbi.nlm.nih.gov/10229638
- Breen ED, Curley JG, Overcashier DE, Hsu CC, Shire SJ. Effect of moisture on the stability of a lyophilized humanized monoclonal antibody formulation. Pharm Res. 2001;18(9):1345–1353. doi:10.1023/a:1013054431517. PMID 11683251. pubmed.ncbi.nlm.nih.gov/11683251
- Kerwin BA, Remmele RL Jr. Protect from light: photodegradation and protein biologics. J Pharm Sci. 2007;96(6):1468–1479. doi:10.1002/jps.20815. PMID 17230445. pubmed.ncbi.nlm.nih.gov/17230445
- ICH Harmonised Tripartite Guideline Q7, Good Manufacturing Practice Guide for Active Pharmaceutical Ingredients, Step 4, 10 November 2000: sections 7.30–7.31, 11.4 and 11.5 (11.50, 11.52). database.ich.org/sites/default/files/Q7%20Guideline.pdf
- 29 CFR 1910.1450, occupational exposure to hazardous chemicals in laboratories: definition of Chemical Hygiene Plan (eCFR). www.ecfr.gov/current/title-29/section-1910.1450