GLP-1 Research Peptides — Semaglutide, Tirzepatide & Retatrutide

The incretin analogues — semaglutide, tirzepatide and retatrutide — are among the most-studied peptides in metabolic research. This overview explains what distinguishes them, from a research standpoint.

The incretin class

GLP-1 (glucagon-like peptide-1) and GIP (glucose-dependent insulinotropic polypeptide) are incretin hormones involved in glucose and energy-regulation signalling. Synthetic analogues of these hormones are widely used as reference compounds in metabolic and endocrine research models.

The three compounds differ by how many incretin receptors they engage:

• Semaglutide — a GLP-1 receptor analogue (single-agonist)
• Tirzepatide — a dual GLP-1 / GIP receptor analogue
• Retatrutide — a triple GLP-1 / GIP / glucagon receptor analogue

Each is supplied lyophilised with an independently published Certificate of Analysis per batch.

Areas of scientific research interest

Preclinical and analytical literature examines this class in experimental models related to:

• Incretin-receptor signalling and binding studies
• Glucose- and energy-metabolism research models
• Neuroendocrine and appetite-signalling pathway research
• Comparative receptor-agonism studies (single vs dual vs triple)

For research comparing metabolic pathways, tirzepatide and the mitochondrial-derived peptide MOTS-C are grouped in our Metabolic Research stack.

These are research contexts only, not efficacy or therapeutic claims. None of these compounds is supplied for therapeutic use, and none is approved for human or animal consumption by East Coast Labs. They are investigational research materials.

Physical & handling properties

• Format: lyophilised powder
• Class: synthetic incretin-analogue peptides
• Reconstitution: dissolve in bacteriostatic water to a clear solution; handle gently
• Storage: refrigerate lyophilised and reconstituted vials; avoid repeated freeze-thaw (storage guide)

Why verification matters here especially

This class is in extremely high demand, which makes it a frequent target for underdosed or mislabelled product. The only reliable check is a batch-specific, independent Certificate of Analysis — HPLC purity plus mass-spec identity confirming the correct molecular weight. Every East Coast Labs batch is tested, published before listing, and verifiable by batch number. See How Peptide Purity Is Tested for what those analyses actually measure.

Supplied strictly for laboratory research use only. Not for human or animal consumption. We do not provide dosing or administration guidance.