This page compares what is documented about Semaglutide and Tirzepatide, rather than ranking them by effect. What each molecule is, the sizes and prices actually carried, what the certificate covers, and how the two differ on the bench. Everything here is research-use-only material and we do not publish outcome, dosing or administration content for any compound in the catalogue.
What is Semaglutide and what is Tirzepatide?
Semaglutide. Semaglutide is the most-cited GLP-1 receptor agonist in the research literature, which makes verified reference material a staple for comparative receptor work.
Tirzepatide. Tirzepatide is the reference dual GIP/GLP-1 receptor agonist in the literature, and it anchors much of the comparative work newer incretin analogues are measured against.
How do Semaglutide and Tirzepatide compare on price and size?
| Semaglutide | Tirzepatide | |
|---|---|---|
| Sizes carried | 5 mg, 10 mg, 15 mg, 20 mg, 30 mg | 5 mg, 10 mg, 15 mg, 20 mg, 30 mg, 40 mg, 50 mg, 60 mg, 70 mg, 80 mg, 90 mg, 100 mg, 110 mg, 120 mg |
| From | $80.00 | $50.00 |
| Best price per unit | $3.83 / mg | $2.17 / mg |
| Availability | Backordered — waitlist | Backordered — waitlist |
| Certificate | Lot certificate on the product page | Lot certificate on the product page |
| Molecular formula | C187H291N45O59 | C225H348N48O68 |
| Molar mass | 4,114 g/mol | 4,813 g/mol |
| Source | PubChem CID 56843331 | PubChem CID 166567236 |
| Research area | GLP-1 receptor research | GIP/GLP-1 receptor research |
At their best sizes Tirzepatide works out at $2.17 per mg against $3.83 for Semaglutide — 77% more for the mg. Vial prices start at $80.00 and $50.00 respectively, which is the number most people compare and the one that says least, because the two are not sold in the same sizes. Full sizes, tier pricing and the lot certificate sit on the Semaglutide page and the Tirzepatide page.
What is each one studied for?
What the published literature investigates, which is a different question from what either will do, and the only one of the two a supplier can answer.
Semaglutide is studied in glp-1 receptor research. GLP-1 receptor biology continues to dominate metabolic-research publishing, and semaglutide remains its most-cited reference compound.
Tirzepatide is studied in gip/glp-1 receptor research. Dual-agonist incretin research keeps expanding, and tirzepatide remains the benchmark compound most new metabolic work is compared against.
Studied in the same area does not make two compounds interchangeable, and the research library holds the per-compound documentation.
Tirzepatide vs Semaglutide: how they differ on the bench
Tirzepatide. Our tirzepatide storage guide is one of the most-read pages on the site: sealed powder archives cold and dark, and prepared solutions get dated the day they are made.
Semaglutide. Semaglutide degrades along predictable routes — our stability guide maps which storage regime suits sealed powder versus a working solution.
What actually differs between Tirzepatide and Semaglutide
Worth doing the arithmetic before comparing sizes: Tirzepatide is 4,813 g/mol and Semaglutide is 4,114 g/mol, a factor of 1.2. A milligram of Semaglutide therefore contains roughly 1.2 times as many molecules as a milligram of Tirzepatide, so two vials of the same labelled mass hold quite different amounts of substance. Equal milligrams are not equal moles, which is what the molarity calculator exists to convert, and it is the reason a price-per-milligram comparison and a price-per-mole comparison can point at different vials.
Identity is the other analytical axis, and it is settled per lot rather than per compound. Semaglutide. Catalogued as Semaglutide, and the certificate's identity test resolves to that. Tirzepatide. Catalogued as Tirzepatide, and the certificate's identity test resolves to that.
Both are released against a certificate reporting identity, purity by the stated method and net peptide content, readable before anything is bought.
Which is better, Tirzepatide or Semaglutide?
Neither Tirzepatide nor Semaglutide is ranked against the other here, and the refusal is deliberate. Better, safer and stronger are questions about effects in a living system, and we sell neither compound for use in one — why none of these pages ranks two compounds sets out the reasoning in full.
What it does instead, for these two:
- Tirzepatide is the cheaper of the two per mg, at $2.17 against $3.83.
- Tirzepatide is the heavier molecule by a factor of 1.2, so equal milligrams are not equal moles.
- Semaglutide is carried in 5 sizes and Tirzepatide in 14, and each lot carries its own certificate.
Every one of those is checkable before you buy.
Common questions
What is the difference between Tirzepatide and Semaglutide?
Different molecules before anything else: Tirzepatide is C225H348N48O68 and Semaglutide is C187H291N45O59. Tirzepatide is the reference dual GIP/GLP-1 receptor agonist in the literature, and it anchors much of the comparative work newer incretin analogues are measured against. Semaglutide is the most-cited GLP-1 receptor agonist in the research literature, which makes verified reference material a staple for comparative receptor work.
Which one should I choose?
Semaglutide is carried in 5 mg, 10 mg, 15 mg, 20 mg, 30 mg and Tirzepatide in 5 mg, 10 mg, 15 mg, 20 mg, 30 mg, 40 mg, 50 mg, 60 mg, 70 mg, 80 mg, 90 mg, 100 mg, 110 mg, 120 mg, each lot with its own certificate. Which of those suits the work is yours to decide; everything here is research-use-only rather than guidance for use in a human or an animal.
Do both Semaglutide and Tirzepatide come with a certificate of analysis?
Neither is in stock at the moment, so in each case the certificate is the one attached to the lot that arrives. A certificate belongs to a lot, not to a product. It is linked from the product page, and reports identity, purity by the stated method, and net peptide content for the material actually in that lot.
Which is cheaper, Tirzepatide or Semaglutide?
Per mg, Tirzepatide at $2.17 against $3.83, taking each one's best size. By vial they start at $80.00 for Semaglutide and $50.00 for Tirzepatide, which is the comparison most people make and the one that says least, because the two are not sold in the same sizes.
Is a milligram of Semaglutide the same as a milligram of Tirzepatide?
By mass yes, by amount of substance no. Tirzepatide is 4,813 g/mol and Semaglutide is 4,114 g/mol, a factor of 1.2, so a milligram of Semaglutide holds roughly 1.2 times as many molecules. Two vials with the same number on the label are not the same amount of substance, which is what the molarity calculator converts.
FOR LABORATORY AND IN-VITRO RESEARCH USE ONLY. NOT FOR HUMAN OR ANIMAL CONSUMPTION. NOT FOR PERSONAL, MEDICAL, DIAGNOSTIC, THERAPEUTIC, OR RECREATIONAL USE.