GLP-1 Research Peptides
For laboratory and research use only. Not for human or veterinary use. The information below summarizes published scientific literature for educational purposes and does not describe how any product should be used.
GLP-1 research peptides are among the most actively studied compounds in modern metabolic science. This guide explains what they are, how the major receptor agonists work at a mechanistic level, what the peer-reviewed literature reports, and how research laboratories evaluate purity, reconstitution, and handling. It is written for qualified researchers and is strictly educational — every compound discussed is supplied by MyGLP1Store for in-vitro and laboratory research only.
What is GLP-1?
Glucagon-like peptide-1 (GLP-1) is an incretin hormone released by the gut in response to nutrient intake. In the scientific literature it is described as acting on the GLP-1 receptor to stimulate glucose-dependent insulin secretion, slow gastric emptying, and modulate appetite signaling in the central nervous system. Because native GLP-1 is broken down within minutes by the enzyme DPP-4, researchers have developed synthetic analogs with extended stability — the basis of the modern GLP-1 receptor agonist class.
The major receptor systems
The compounds most studied in this space act on one or more of three related receptors. Understanding the difference is the key to understanding the whole category:
- GLP-1 receptor — the foundation of the class. Single-agonist compounds such as semaglutide target this receptor alone.
- GIP receptor — glucose-dependent insulinotropic polypeptide, a second incretin pathway. Dual agonists such as tirzepatide engage both GIP and GLP-1 receptors.
- Glucagon receptor — activation of this third pathway is associated in the literature with increased energy expenditure. Triple agonists such as retatrutide engage GLP-1, GIP, and glucagon receptors together.
The major GLP-1 research peptides
Each compound below has a dedicated research profile. These pages summarize the published science; the linked product listings are for laboratory research use only.
- Semaglutide — a single GLP-1 receptor agonist and the most widely studied molecule in the class.
- Tirzepatide — a dual GIP/GLP-1 receptor agonist studied across the SURPASS and SURMOUNT clinical programs.
- Retatrutide — an investigational triple GLP-1/GIP/glucagon receptor agonist studied in Eli Lilly’s TRIUMPH program.
- CagriSema — a combination research formulation pairing cagrilintide (an amylin analog) with a GLP-1 mechanism.
For a side-by-side breakdown of the two most-compared molecules, see Semaglutide vs Tirzepatide. To browse the full catalog, visit GLP-1 research peptides.
What the published literature reports
The clinical trials referenced throughout this hub were conducted by pharmaceutical sponsors on the corresponding approved or investigational drug products — not on research-grade material. They are summarized here only to explain the science. For example, the Phase 2 retatrutide trial published in the New England Journal of Medicine (Jastreboff et al., 2023) characterized the triple-agonist mechanism, and the SURMOUNT and STEP programs characterized tirzepatide and semaglutide respectively. Researchers working with these compounds should consult primary sources on PubMed directly.
How laboratories evaluate quality
For research to be reproducible, the starting material has to be characterized. The standard markers a laboratory looks for are:
- Purity by HPLC — high-performance liquid chromatography quantifies the percentage of the target compound. Research-grade peptides are typically characterized at ≥99% purity.
- Certificate of Analysis (COA) — third-party documentation of identity, purity, and mass. Every compound in our catalog has a COA available on the Lab Results page.
- Lyophilized form — peptides ship as a freeze-dried powder for stability in transit, then are reconstituted in the lab before use.
MyGLP1Store is a veteran-owned supplier; you can read more about our testing approach on the About page.
Reconstitution and handling (research)
Before a lyophilized peptide can be used in a study it must be reconstituted — dissolved into solution with a sterile diluent. Bacteriostatic water is the standard diluent for multi-use research vials because its preservative protects the prepared solution between draws. The volume of diluent added determines the final concentration, so accuracy matters. Our free reconstitution calculator returns the exact diluent volume for any vial, and the full walkthrough is in our guide to reconstituting GLP-1 peptides. Bacteriostatic water is included free with every order.
Frequently asked questions
What does “GLP-1 research peptide” mean?
It refers to a synthetic peptide that acts on the GLP-1 receptor system, supplied in research-grade form for laboratory and in-vitro study only — not as an approved drug product.
What is the difference between single, dual, and triple agonists?
A single agonist (semaglutide) engages the GLP-1 receptor; a dual agonist (tirzepatide) engages GLP-1 and GIP; a triple agonist (retatrutide) engages GLP-1, GIP, and glucagon receptors.
How are these peptides characterized for purity?
By HPLC analysis, with a third-party Certificate of Analysis documenting identity and purity. COAs are published on our Lab Results page.
How are they reconstituted?
With sterile bacteriostatic water as the diluent; the exact volume is determined by the vial’s milligram content and the target concentration, which our free calculator computes.
Disclaimer: All products offered by MyGLP1Store are intended strictly for laboratory and research use. They are not approved drugs, not supplements, and are not for human or veterinary consumption. Clinical trial data cited above pertains to pharmaceutical drug products studied by their sponsors and is provided for scientific context only.