General handling, storage, and documentation practices used when working with lyophilized research peptides in a laboratory setting. This page covers laboratory methodology only — it does not address administration, dosing, or any form of usage.
Lyophilized (freeze-dried) peptides are chemically stable in powder form for extended periods when kept correctly, but that stability depends on a few consistent conditions:
Reconstitution is the process of returning a lyophilized peptide to solution, typically with bacteriostatic water or sterile water for laboratory use. A few principles apply broadly across compounds:
This site does not provide compound-specific reconstitution ratios or concentration targets, since appropriate concentrations vary by research protocol and should be determined with reference to the specific compound's certificate of analysis and your institution's research design — not a general web reference. Once you've determined a mass and diluent volume for your own record-keeping, the Laboratory Use Only Calculator can help document the resulting mg/mL figure.
Once in solution, peptides are considerably less stable than in lyophilized form. Reconstituted samples are typically kept refrigerated, used within a limited window, and protected from repeated freeze-thaw cycling, which is one of the more common causes of degraded results in peptide research. If a research protocol requires long-term storage of reconstituted material, aliquoting into single-use portions before freezing is a common practice to avoid repeated cycling of the full sample.
Good record-keeping is what separates reproducible research from anecdote. A typical lab log for a peptide sample includes:
| Field | Why it matters |
|---|---|
| Lot / batch number | Links the sample back to its certificate of analysis |
| Receipt & storage date | Establishes the timeline for stability assumptions |
| Reconstitution date & solvent | Needed to interpret any later measurement |
| Storage conditions | Documents deviations that could affect results |
| Disposal date & method | Closes the chain of custody for the sample |
A COA is issued per production lot and typically documents purity (usually via HPLC), mass confirmation (via mass spectrometry), and sometimes sterility or endotoxin testing. When evaluating a research peptide source, a lot-specific COA — one that matches the exact batch you received, not a generic reference document — is the strongest signal of quality control.