Peptide Research Guide
A practical guide to understanding peptides as research materials, what they are, how they're characterized, and how to handle them in the lab. Every section links to deeper reference material in our Research Library.
What are peptides?
Peptides are short chains of amino acids linked by peptide bonds, typically 2 to 50 residues long, between single amino acids and full proteins in size. In research they're studied as defined molecules with specific sequences, which makes them useful reference materials. Start with what research peptides are, and how they differ from larger molecules in peptides vs. proteins.
How research peptides are made
Most are produced by solid-phase peptide synthesis (SPPS), building the chain one residue at a time, then purified. The chemistry of the bond itself is covered in peptide bonds explained, and the production process in how research peptides are synthesized. Whether a peptide is cyclic or linear affects its stability and handling.
Reading the specification & COA
A specification lists the molecular formula, molecular weight, and usually a CAS number, the unique identifier for the compound. The Certificate of Analysis then documents identity and purity. See how to read a spec sheet and how to read a COA, plus net peptide content vs. gross weight.
Purity & identity
Two questions matter: how pure is it, and is it the right molecule? HPLC answers purity (the main-peak percentage), while mass spectrometry confirms identity. Read together on a COA, and ideally backed by third-party testing, they give confidence in what you're working with. Our Quality & Testing page covers our process.
Common research compound categories
Researchers group compounds by chemistry and the receptor systems they're studied against. A few well-characterized families, each with a research overview and the corresponding material:
- Copper peptides, the GHK family. See copper peptides in research or the GHK-Cu overview · GHK-Cu (material)
- Growth-hormone secretagogues, ghrelin-receptor ligands. See the class overview or Ipamorelin overview · Ipamorelin (material)
- Melanocortin-receptor agonists, see the class overview, PT-141 / Melanotan II overviews · PT-141, Melanotan II
- Mitochondrial-derived peptides, see the class overview or MOTS-c overview · MOTS-c (material)
- Thymosin peptides, see thymosin beta-4 & alpha-1 or the TB-500 overview · TB-500 (material)
These describe research categories and molecular identity only, not any effect in humans.
Storage & handling
- Store lyophilized (freeze-dried) material cold and dry, typically at -20°C or lower
- Once dissolved for laboratory use, store at 2-8°C
- Minimize repeated freeze-thaw cycles; aliquot where practical
- Protect from light and moisture
More in storing research peptides, lyophilized vs. dissolved storage, and peptide stability & degradation.
Research use only
All peptides offered here are intended strictly for laboratory and research use, not for human or veterinary consumption, and not for any diagnostic or therapeutic purpose. Full terms are on our Research Use Policy.