Pure North Peptides Journal · Canada
The GLP-1 class for Canadian metabolic researchers
Published 2026-01-13 · Updated 2026-05-24 · Pure North Peptides Editorial · Canada
Short answer: The GLP-1 class spans three structural generations — single, dual, and triple receptor agonists. Pure North Peptides supplies the two endpoints of that spectrum (Semaglutide and Retatrutide) as HPLC-verified Canadian-shipped reference standards. Tirzepatide and the newer dual GLP-1/glucagon compounds (Mazdutide, Survodutide) are not currently stocked.
What "GLP-1 class" actually means
The GLP-1 class is a family of incretin-axis peptides that share at least one receptor target with native GLP-1 (glucagon-like peptide-1). The defining clinical-research interest in the class is metabolic: incretin signaling drives glucose-dependent insulin secretion, slows gastric emptying, and reduces caloric intake via central satiety pathways. Successive generations of GLP-1-class peptides extend that signaling to additional metabolic receptors.
The class, by receptor breadth
- Single agonists (GLP-1 only): Semaglutide is the dominant research reference. Liraglutide and lixisenatide are earlier-generation analogues in the same class. Native GLP-1 itself, with a 1-2 minute serum half-life, is largely a comparative reference rather than a working tool.
- Dual agonists: Two distinct second-receptor strategies exist. GLP-1/GIP is the Tirzepatide route — recruiting the GIP receptor as an additional incretin-axis target. GLP-1/glucagon is the Mazdutide and Survodutide route — recruiting hepatic glucagon signaling for energy expenditure.
- Triple agonists (GLP-1 + GIP + glucagon): Retatrutide is the principal compound here. By combining all three metabolic receptors in one molecule, it asks whether stacking incretin and energy-expenditure signaling produces a more-than-additive effect.
What Pure North Peptides actually stocks
| Compound | Receptors | Vial size | Reference price |
|---|---|---|---|
| Semaglutide | GLP-1 | 10 mg lyophilized | $85 CAD |
| Retatrutide | GLP-1 + GIP + glucagon | 5 mg lyophilized | $60 CAD |
Tirzepatide, Mazdutide, and Survodutide are not currently stocked. Researchers needing those compounds typically import from international suppliers — with the cold-chain and customs caveats that come with that.
The Canadian-domestic argument
For Canadian metabolic-research groups, the case for domestic GLP-1-class sourcing rests on three things:
- No customs hold-ups. Imported peptides routinely sit at CBSA for additional review, which can take days to weeks. A research timeline that needs vials by Friday can't accommodate a two-week customs delay.
- Shorter transit window. Domestic Canada Post Xpresspost shipments typically arrive in ~4 days. International transit windows can stretch to 7–14 days, during which a sealed lyophilized vial is mostly fine but a thermally compromised one may not be.
- Public per-lot COAs. Domestic shipments still need verification. Pure North Peptides publishes the lot-specific Janoshik certificate at /lab-results/ so the researcher receiving a vial can cross-check the chromatogram before any experimental run.
Pricing context: how Canadian research peptide pricing works
Research-peptide pricing reflects synthesis difficulty (more residues + complex modifications = harder synthesis), the scale of the upstream manufacturer's production run, and the markup added by the supplier. Semaglutide synthesis is now well-established and high-volume globally; retatrutide synthesis is somewhat more complex but the demand has scaled enough to bring unit cost down. The newer dual GLP-1/glucagon compounds (Mazdutide, Survodutide) tend to run more expensive because production volumes are smaller. Pure North Peptides publishes single-vial CAD pricing at the catalog — /products/?cat=metabolic — with no auto-discounts or hidden volume rules: the price you see is the price you pay.
Storage and reconstitution: the same for all GLP-1-class peptides
All members of the class are lyophilized peptides that follow the standard storage protocol: −20 °C sealed, desiccated, 24+ month shelf life. Reconstitution is in bacteriostatic water (0.9% benzyl alcohol) at the researcher's working concentration. After reconstitution, store at 4 °C and use within 28 days. See the peptide storage guide for the full protocol and the reconstitution protocol for technique detail.
Comparative research design across the class
Two practical notes for designing comparative GLP-1-class experiments:
- Equimolar dosing. Different compounds have different molecular weights, so for receptor-pharmacology comparisons keep dosing equimolar rather than equimass. The peptide calculator handles the math.
- Source the comparators carefully. If you're comparing Pure North-supplied Retatrutide against a tirzepatide vial from a different supplier, document both COAs in your methods — reviewers do ask about cross-supplier comparability.
Frequently Asked Questions
What is the difference between single, dual, and triple GLP-1 agonists?
Single agonists target only the GLP-1 receptor (Semaglutide is the canonical example). Dual agonists target GLP-1 plus a second metabolic receptor — either GIP (Tirzepatide) or glucagon (Mazdutide, Survodutide). Triple agonists like Retatrutide target all three.
Which GLP-1 peptides does Pure North Peptides actually supply?
Semaglutide (single-agonist, $85 CAD/10 mg) and Retatrutide (triple-agonist, $60 CAD/5 mg). Tirzepatide, Mazdutide, and Survodutide are not currently stocked. Researchers needing those typically import internationally.
Are these GLP-1 peptides legal in Canada?
Yes, when sold strictly as laboratory research reference standards. They are not approved by Health Canada as drugs for therapeutic use, and customers accept a research-use declaration at checkout.
How do I compare across the class if Pure North doesn't stock all five?
For the receptor-breadth comparison Pure North's Semaglutide + Retatrutide pair already covers the endpoints (single vs. triple). For the dual-agonist middle of the class, you'd need to source Tirzepatide / Mazdutide / Survodutide separately and document the cross-supplier COAs in your methods.
Can I order Semaglutide + Retatrutide in one shipment?
Yes. Single-cart Canadian-shipped orders are standard. Free shipping applies on orders over $250 CAD; otherwise a flat $25 shipping fee.
What's the receptor-pharmacology rationale for studying all three generations?
Each generation adds a metabolic-axis receptor. Side-by-side comparison helps isolate which receptor contributes to a given downstream signal in the model of interest — the question of whether the extra receptor arm produces a proportional readout or whether the GLP-1 arm remains dominant.
Disclaimer: All Pure North Peptides products are supplied for laboratory research use only. Refer to our research-use declaration for full terms.