Semaglutide

Description

Semaglutide is a 31-residue GLP-1 analogue engineered to survive plasma long enough to be useful. Native GLP-1 has a half-life measured in minutes. Semaglutide’s runs past 165 hours. Two substitutions and a C18 fatty diacid linker — that is the engineering. The pharmacology it unlocks is why this compound has one of the deepest GLP-1 receptor research literatures available.

Proposed Mechanism

The Aib8 substitution blocks dipeptidyl peptidase IV cleavage. The Arg34 substitution reduces another clearance pathway. The C18 fatty diacid linker binds serum albumin, which keeps the peptide tethered to a carrier protein large enough to slow renal filtration. Receptor activity is classical: GLP-1 receptor on pancreatic beta cells and a range of extra-pancreatic tissues, signaling through Gs-adenylyl cyclase-PKA. Lau et al. (2015) is the molecular characterization that anchors the design.

Research Literature

Lau et al. (2015, Journal of Medicinal Chemistry) is the discovery and characterization paper. Knudsen and Lau (2019) reviewed the GLP-1 analogue series and positioned semaglutide against liraglutide — the key structural differences are the Aib8 substitution and the extended C18 linker rather than C16. Kapitza et al. (2015) and Nauck et al. (2016) examined pharmacokinetic profiles across dose ranges. Knudsen (2019, Frontiers in Endocrinology) is the accessible review for anyone entering the literature from outside incretin pharmacology.

Further reading: PubMed references for this compound.

Research Applications

Used in GLP-1 receptor binding studies, incretin pharmacology research, beta-cell insulin-secretion signaling assays, and albumin-binding peptide design research. Among the most extensively characterized GLP-1 receptor agonists in peer-reviewed literature.

Supplied strictly for laboratory research use. Not for human or veterinary use.

Reconstitution

Supplied as a lyophilized powder. Reconstitute with bacteriostatic water prior to use. Use the Peptigo reconstitution calculator for guidance on volume and concentration.

Storage

• Unopened: room temperature up to 30 days during transit; refrigerate at 2-8°C long-term.
• Reconstituted: refrigerate at 2-8°C; stable 4-6 weeks. Protect from light.

Quality Verification

Every batch is independently tested by Janoshik Analytical. Certificates of Analysis include HPLC-UV purity, LC-MS identity confirmation, LAL bacterial endotoxin quantification, and USP <71> sterility testing.

Not a drug, supplement, or cosmetic. For in vitro research use only. Not for human consumption.

Frequently Asked Questions

Is this product legal to purchase in Canada for research use?

Peptigo supplies all products strictly for laboratory and in vitro research use. The compound is not a drug, supplement, or cosmetic, and is not sold for human or veterinary use. Researchers purchasing for their own laboratory work, university research programs, or independent in vitro protocols are the intended customer base. Health Canada’s April 2026 advisory specifically addresses unauthorized injectable peptide use; the research-use framing of this product is independent of that consumer-use category.

How is purity verified, and where can I see the Certificate of Analysis?

Every batch is tested independently by Janoshik Analytical, an accredited third-party laboratory. The standard testing panel includes HPLC-UV purity verification, LC-MS identity confirmation, LAL bacterial endotoxin quantification, and USP sterility testing. The Certificate of Analysis for each batch is available on the product page after purchase, and the testing methodology is detailed on the Lab Testing reference page.

What is the standard reconstitution and storage protocol for laboratory use?

The compound is supplied as a lyophilized powder. The standard diluent for reconstitution in research protocols is bacteriostatic water (0.9% benzyl alcohol). The Peptigo reconstitution calculator handles the volume-and-concentration arithmetic for a given target research dose. Unopened lyophilized peptide is stable at room temperature for up to 30 days during transit and should be refrigerated at 2-8°C for long-term storage. Reconstituted peptide should be refrigerated at 2-8°C and is typically functional for 4-6 weeks; protect from light.