This page compares what is documented about Retatrutide 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 Everything here is research-use-only material and we do not publish outcome, dosing or administration content for any compound in the catalogue.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 Retatrutide and what is Tirzepatide?
Retatrutide. Retatrutide is a triple GIP/GLP-1/glucagon receptor agonist, and peer-reviewed metabolic-research output on multi-receptor incretin pharmacology has grown every year since 2022.
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 Retatrutide and Tirzepatide compare on price and size?
| Retatrutide | Tirzepatide | |
|---|---|---|
| Sizes carried | 5 mg, 10 mg, 15 mg, 20 mg, 30 mg, 40 mg, 50 mg, 60 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 | $3.57 / mg | $2.17 / mg |
| Availability | Backordered — waitlist | Backordered — waitlist |
| Certificate | Lot certificate on the product page | Lot certificate on the product page |
| Molecular formula | C221H342N46O68 | C225H348N48O68 |
| Molar mass | 4,731.3 g/mol | 4,813 g/mol |
| Source | — | PubChem CID 166567236 |
| Research area | incretin receptor pharmacology | GIP/GLP-1 receptor research |
At their best sizes Tirzepatide works out at $2.17 per mg against $3.57 for Retatrutide — 65% 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 Retatrutide 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.
Retatrutide is studied in incretin receptor pharmacology research. Incretin pharmacology remains one of the most active areas in metabolic research, with multi-receptor agonists drawing sustained attention in the primary literature.
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 Retatrutide: 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.
Retatrutide. Lyophilised retatrutide holds longest sealed, desiccated and dark; our storage guide covers why every degradation route accelerates the moment water enters the vial.
What actually differs between Tirzepatide and Retatrutide
The two are within a few percent of each other on molar mass — Retatrutide at 4,731.3 g/mol and Tirzepatide at 4,813 g/mol — so a milligram of one is close to the same number of molecules as a milligram of the other. That is unusual, and it is the only case where comparing the two by mass alone is nearly the same as comparing them by amount of substance.
Identity is the other analytical axis, and it is settled per lot rather than per compound. 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 Retatrutide?
Neither Tirzepatide nor Retatrutide 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 $3.57.
- Their molar masses are within a few percent, so a milligram of either is close to the same amount of substance.
- Retatrutide is carried in 8 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 Retatrutide?
Different molecules before anything else: Tirzepatide is C225H348N48O68 and Retatrutide is C221H342N46O68. 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. Retatrutide is a triple GIP/GLP-1/glucagon receptor agonist, and peer-reviewed metabolic-research output on multi-receptor incretin pharmacology has grown every year since 2022.
Which one should I choose?
Retatrutide is carried in 5 mg, 10 mg, 15 mg, 20 mg, 30 mg, 40 mg, 50 mg, 60 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 Retatrutide 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 Retatrutide?
Per mg, Tirzepatide at $2.17 against $3.57, taking each one's best size. By vial they start at $80.00 for Retatrutide 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 Retatrutide the same as a milligram of Tirzepatide?
By mass yes, and unusually so by amount of substance too: Retatrutide is 4,731.3 g/mol and Tirzepatide is 4,813 g/mol, within a few percent, so a milligram of either is close to the same number of molecules. That is rarely true of two different peptides and it is worth checking rather than assuming.
FOR LABORATORY AND IN-VITRO RESEARCH USE ONLY. NOT FOR HUMAN OR ANIMAL CONSUMPTION. NOT FOR PERSONAL, MEDICAL, DIAGNOSTIC, THERAPEUTIC, OR RECREATIONAL USE.