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Peptide Research Glossary

Key terms in peptide science, defined plainly.

The summary below reflects published preclinical and laboratory research and is provided for scientific reference only.

Plain-language definitions of the terminology that recurs throughout this library. Where a term appears in a peptide profile, this is what it means.

Peptide
A short chain of amino acids — smaller than a protein — that often acts as a signaling molecule in the body.
Amino acid
The molecular building block of peptides and proteins. Sequence determines a peptide's shape and function.
Lyophilized
Freeze-dried into a stable powder. Research peptides are supplied lyophilized to preserve integrity during storage and shipping.
Reconstitution
Dissolving a lyophilized peptide into solution in the laboratory, per the investigator's protocol.
HPLC
High-Performance Liquid Chromatography — the analytical method used to confirm a peptide's purity, typically reported on a Certificate of Analysis.
Certificate of Analysis (COA)
A third-party document verifying a compound's identity and purity by methods such as HPLC and mass spectrometry.
In vitro
Research performed on cells or tissue outside a living organism — literally 'in glass.' Useful for mechanism, limited in scope.
In vivo
Research performed within a living organism, most often an animal model. The majority of peptide data is in vivo animal research.
Preclinical
Research conducted before human trials — in vitro and animal studies. A preclinical finding is a hypothesis about humans, not a conclusion.
Angiogenesis
The formation of new blood vessels. A recurring mechanism in tissue-repair peptide research.
Incretin
A gut hormone (such as GLP-1 or GIP) released after eating that amplifies insulin secretion.
GLP-1
Glucagon-like peptide-1, an incretin hormone central to metabolic research and the target of GLP-1 receptor agonists.
Receptor agonist
A molecule that binds and activates a specific receptor, triggering its downstream signaling.
Half-life
The time for half of a compound to be cleared or degraded — a key determinant of how long its activity persists.
Research Use Only (RUO)
A designation meaning a material is intended solely for laboratory research — not for human or veterinary use, diagnosis, or treatment.
Bacteriostatic water
Sterile water containing 0.9% benzyl alcohol, used in laboratory settings to reconstitute lyophilized peptides.
For Research Use Only. This material is provided for educational and scientific reference. It summarizes published preclinical and laboratory research and is not medical advice. These compounds are not approved for human or veterinary use, diagnosis, treatment, or the prevention of any disease.