Storing your peptides

Three words: cold, dry, and dark. Keep your peptides refrigerated or frozen, sealed away from moisture, and out of direct light. Every way a peptide can break down speeds up the moment any one of those three is compromised — so proper storage is the single biggest factor in how long your peptides last and how reproducible your results are.

Lyophilized simply means freeze-dried into a stable powder. Freeze-drying dramatically improves stability, but it is not permanent protection. A lyophilized peptide is stable as a dry powder yet remains chemically fragile — the moment it absorbs moisture from the air, the molecules become mobile again and degradation begins. That is why keeping the powder dry and sealed matters so much.

In the refrigerator, lyophilized peptides keep well for about 1–2 months. For longer-term storage, move them to the freezer.

Yes. Let a frozen peptide thaw in the refrigerator for 24 hours before reconstituting it (mixing it with bacteriostatic water). Warming it up slowly in the fridge, rather than at room temperature, protects the peptide from the stress of a rapid temperature change.

Bacteriostatic water is sterile water containing a small amount of benzyl alcohol (typically 0.9%), an additive that inhibits the growth of bacteria. That bacteriostatic property is why it is commonly used to reconstitute lyophilized peptides in a laboratory setting: it helps limit microbial growth during repeated aseptic sampling from the same vial. Plain sterile or distilled water offers no such protection, so a peptide reconstituted in it has a much shorter usable window.

Once a lyophilized peptide is dissolved into liquid, the clock speeds up — the molecules are mobile again and degradation resumes. How long it stays usable depends on the specific peptide, its concentration, the solvent, sterility, and storage conditions, so there is no single figure that applies to every compound. As general handling practice in a research setting, keep a reconstituted vial refrigerated (2–8°C), protected from light, and free of repeated freeze-thaw cycles; consult the batch documentation and published literature for the compound you are working with, and discard any solution that turns cloudy or shows particulates.

A Certificate of Analysis (COA) is the single most important document in the research peptide supply chain — it's what turns an anonymous white powder into a scientifically verifiable reagent. Because our compounds are For Research Use Only (RUO) and are not regulated like pharmaceuticals, the responsibility for verification sits with you, the researcher, and the COA is your primary quality-assurance tool. A legitimate COA answers four core questions:

• Identity — Is this the correct peptide sequence? Confirmed by Mass Spectrometry (MS).
• Purity — Is it chemically clean? Measured by HPLC.
• Content — How much actual peptide is in the vial? Reported as Net Peptide Content.
• Contaminants — Are any harmful compounds present? Checked with heavy metals and endotoxin testing.

Credible suppliers use independent, third-party laboratories to produce their COAs. Third-party testing removes any conflict of interest, so you get unbiased, empirical data rather than marketing claims.

One practical note: most third-party providers (such as Janoshik) group identity, purity, and content into a single test result, while contaminant testing is usually done separately — typically one test for endotoxins and one for heavy metals.

Transparency is the entire premise of Honest Science, and a third-party Certificate of Analysis is how we back it up. COAs are maintained for tested batches — documenting identity, purity, and content — and are available where applicable, so you are never asked to take an anonymous white powder on faith. (See the COA questions above for what the document proves and why independent testing matters.)

Purity is the percentage of the material in the vial that is the target peptide, as opposed to truncated sequences, deletion variants, or leftover synthesis reagents. A purity of ≥99% means that, by area, at least 99% of the sample is the intended compound. It is measured by High-Performance Liquid Chromatography (HPLC), which separates the sample into its components so each can be quantified, while Mass Spectrometry (MS) confirms the molecule's identity by its mass. Purity and identity together are what let a result be trusted and reproduced.

A single peptide is one compound — it has one molecular formula, one molecular weight, and one amino-acid sequence, all listed on its product page. A blend combines two or more peptides in a single vial. Because a blend has no single formula, each blend's product page lists every compound it contains with its own individual molecular profile — formula, weight, and sequence — so nothing is hidden behind a marketing name. Blends are supplied as a combined lyophilized powder for reconstitution in a research setting.

Because everything we sell is For Research Use Only (RUO) and not for human consumption. Listing a dose or a health benefit would imply a therapeutic use these compounds are not approved or sold for. Instead, we publish the data that is actually verifiable and useful for research — purity, identity, molecular details, and a third-party COA — and leave experimental design to the qualified researcher.