What are research peptides?
A straightforward overview of peptide chemistry, how research peptides are manufactured, and what to look for when sourcing them for laboratory use.
Peptides: the basics
Peptides are short chains of amino acids linked by peptide bonds. They are typically defined as sequences containing between 2 and 50 amino acid residues, distinguishing them from larger proteins. Peptides are found naturally throughout the body and play roles in signaling, immune modulation, and cellular communication.
Research peptides are synthetically manufactured versions of these naturally occurring sequences (or novel analogues) produced for use in laboratory and preclinical research settings. They are not drugs, supplements, or food products.
How are research peptides made?
Most research peptides are produced via solid-phase peptide synthesis (SPPS), a method developed by Bruce Merrifield in the 1960s. The process involves anchoring the first amino acid to an insoluble resin support, then sequentially adding protected amino acids one at a time. After the full chain is assembled, the peptide is cleaved from the resin, purified (typically by HPLC), and lyophilized into a dry powder form.
Quality manufacturers then perform analytical testing — including HPLC purity analysis — to verify the final product meets specifications before release.
What to look for when sourcing
Third-party testing
Independent COA documentation with HPLC purity verification. Avoid suppliers who don't provide batch-specific testing data.
Purity standards
Research-grade peptides should meet ≥98% purity (HPLC). Lower purity may indicate incomplete synthesis, degradation, or contamination.
Proper storage
Lyophilized peptides should be stored at -20°C and protected from moisture and light.
Clear RUO labeling
Reputable suppliers clearly label all products as "Research Use Only" and do not make medical claims, dosing recommendations, or therapeutic promises.
All products are for research use only (RUO) — not for human or veterinary use. Information on this page is for educational context only.