Research education
What are research peptides?
Research peptides are short chains of amino acids, produced synthetically and supplied to laboratories as a dry, lyophilised powder for in-vitro and preclinical research. This page explains what they are, how they are made, how purity is measured, and the vocabulary you will see on a certificate of analysis.
Research use only. Not for human or veterinary use. Buyers must be 21 or older.
Peptides, defined
A peptide is a chain of amino acids joined by peptide bonds. Chains are usually described as peptides up to roughly fifty residues; longer chains are generally called proteins. Because they are small and sequence-defined, peptides can be manufactured to a precise, reproducible structure rather than extracted from biological material.
Most research peptides are produced by solid-phase peptide synthesis, in which the chain is assembled one residue at a time on a solid resin, then cleaved, purified by chromatography and freeze-dried. The result is a white lyophilised powder in a sealed vial, stable for long periods when kept cold and dry.
"Research peptide" describes the intended use, not a different chemistry: material supplied for laboratory research only, not as a medicine, supplement or veterinary product.
How purity is measured
HPLC
High-performance liquid chromatography separates the target peptide from related impurities and reports purity as a percentage of the total peak area. It is the headline number on a certificate of analysis.
Mass spectrometry
Mass spectrometry confirms identity by measuring molecular mass. HPLC tells you how clean the material is; MS tells you that it is the right molecule.
Certificate of analysis
A COA records the tested batch, the assay method, the measured purity and peptide content, and who performed the test. A COA from an independent laboratory carries more weight than an in-house sheet.
Batch traceability
Each production lot carries its own batch code. A report that names the batch you received is verifiable; a generic report attached to a product page is not.
How research peptides are supplied
- Lyophilised powder. Freeze-drying removes water so the peptide stays stable in transit and in storage. The powder is reconstituted in the laboratory immediately before use.
- Sealed vials, labelled by mass. Vials are specified by peptide mass in milligrams, not by concentration — concentration depends on how much solvent you add.
- Solvent supplied separately. Bacteriostatic or sterile water is ordered alongside the compound; our reconstitution guide covers solvent selection and volumes.
- Cold-chain shipping. Insulated, tracked dispatch limits heat exposure during transit, which is the main practical cause of degradation before the vial ever reaches the bench.
Glossary
- Lyophilisation. Freeze-drying under vacuum to produce a dry powder.
- Purity (%). Proportion of the sample that is the target peptide, as measured by HPLC peak area.
- Peptide content. Actual mass of peptide in the vial, which can differ slightly from the label mass and is reported separately from purity.
- Aliquot. A single-use portion of reconstituted solution, split off to avoid repeated freeze–thaw cycles.
- COA. Certificate of analysis: the test report for a specific batch.
Frequently asked questions
Keep reading
Where to buy research peptides legally online
A supplier checklist covering third-party assays, batch traceability, shipping and payment.
Are research peptides safe?
Laboratory handling, storage stability, contamination control and disposal.
Reconstitution & stability guide
Solvent selection, volumes, storage temperatures and stability windows.
All research guides
The full Nordgen library of laboratory reference material.