Pure North Peptides Journal · Canada
Tirzepatide vs Semaglutide: A Canadian Researcher's Comparison
Published 2026-02-27 · Pure North Peptides Editorial · Canada
Short answer: Semaglutide is a single GLP-1 receptor agonist; Tirzepatide is a dual GLP-1 / GIP agonist. Both are widely characterized in the metabolic-research literature. Neither is currently stocked at Pure North — both are referenced here for academic comparison only. Within the GLP-1 class, the reference standard Pure North currently stocks is Retatrutide 20 mg, an HPLC-verified tri-agonist (GLP-1 + GIP + glucagon) supplied for in-vitro research use.
Receptor profile
| Compound | Targets | MW (approx) |
|---|---|---|
| Semaglutide | GLP-1 receptor | ~4113 Da |
| Tirzepatide | GLP-1 + GIP receptors (dual) | ~4814 Da |
What we carry
Retatrutide 20 mg is the GLP-1-class reference standard Pure North currently stocks: an HPLC-verified, lyophilized tri-agonist (GLP-1 + GIP + glucagon) supplied for in-vitro research. Orders are dispatched within 2 business days and ship across Canada via Canada Post Xpresspost (~4 days transit).
Tirzepatide and Semaglutide: Not in our catalog. Both are referenced here for academic comparison only. For comparative in-vitro work in this class, Retatrutide 20 mg is the multi-receptor reference standard we stock.
Lyophilization and storage
GLP-1-class reference standards in this family are supplied lyophilized in clear glass vials with chrome-crimped caps, and the lyophilized cake stays stable for 24+ months when stored cold and desiccated. Reconstitute with bacteriostatic water; use within 28 days at 2–8°C.
Choosing for your research
Multi-receptor (tri-agonist) in-vitro comparison → our Retatrutide 20 mg (GLP-1 + GIP + glucagon), the GLP-1-class reference standard we stock. Single-receptor (Semaglutide-class) or dual-receptor (Tirzepatide-class) compounds are not currently in our catalog; browse the full catalog for what is in stock.
Why Pure North Peptides?
Our Retatrutide 20 mg is dispatched within 2 business days and ships from Canada via Canada Post Xpresspost (~4 days transit). Domestic Canadian shipping eliminates customs holds (a 15–25% risk on US imports). HPLC-verified ≥99% purity per lot, COA available on request — see our lab results.
Retatrutide 20 mg Browse the catalog
Frequently Asked Questions
How does Tirzepatide differ from Semaglutide pharmacologically?
Tirzepatide is a dual GLP-1/GIP agonist while semaglutide is a single GLP-1 agonist. In published metabolic research models, dual-receptor compounds often show greater effects than single-receptor ones, though direct comparisons depend on dose and protocol. Pure North Peptides does not carry Tirzepatide; this is a literature reference.
Does Pure North Peptides carry Tirzepatide or Semaglutide?
No. Neither is currently stocked; both are referenced here for academic comparison only. Within the GLP-1 class the reference standard we stock is Retatrutide 20 mg (a tri-agonist), supplied for in-vitro research.
How does Pure North Peptides ship across Canada?
Orders are dispatched within 2 business days and ship from Canada to all 10 provinces and 3 territories via Canada Post Xpresspost, with roughly 4 days transit for most regions.
Are both compounds the same molecular size?
Tirzepatide is larger (~4814 Da) than semaglutide (~4113 Da) due to the additional GIP-binding domain.
Should I order BAC water with my GLP-1 research peptide?
Yes. Lyophilized peptides require reconstitution with sterile or bacteriostatic water before use. Add a 10 mL vial at purenorthpeptides.com/products/bac-water/.
Disclaimer: All Pure North Peptides products are supplied for laboratory research use only. Refer to our research-use declaration for full terms.