---
title: "What is the molecular weight of tirzepatide? | Sable Peptides"
description: "The molecular weight of Tirzepatide is 4813.0 g/mol on the registry record used for identity. The molecular formula is C225H348N48O68."
canonical: https://www.sablepeptides.co.uk/questions/tirzepatide-molecular-weight
publisher: Sable Peptides Limited (UK company 17488610)
note: Research use only. Not for human or veterinary use.
---

# What is the molecular weight of tirzepatide?

The molecular weight of Tirzepatide is 4813.0 g/mol on the registry record used for identity. The molecular formula is C225H348N48O68. CAS Registry Number 2023788-19-2. PubChem CID 166567236. It is classed as a peptide (lipidated). Synonyms include LY3298176. Laboratories use this mass when confirming identity by mass spectrometry.

Mass. The expected average mass for identity confirmation is 4813.0 g/mol.

Formula. C225H348N48O68.

Analytical note. Sable's release specification is ≥99% by HPLC with identity confirmed against the expected mass (quality page). Research use only. Not a medicine. Not for human or veterinary use.

## Sources

-   [https://pubchem.ncbi.nlm.nih.gov/compound/166567236](https://pubchem.ncbi.nlm.nih.gov/compound/166567236)

See the [Tirzepatide research hub](/hubs/tirzepatide) for every Sable page on Tirzepatide.

## Tirzepatide: reference facts

7 Tirzepatide values, each linked to its public source; see the [Tirzepatide reference page](/ref/tirzepatide).

| Synonyms | LY3298176 (pubchem.ncbi.nlm.nih.gov) |
| --- | --- |
| Compound class | peptide (lipidated) (pubchem.ncbi.nlm.nih.gov) |
| CAS Registry Number | 2023788-19-2 (pubchem.ncbi.nlm.nih.gov) |
| Molecular formula | C225H348N48O68 (pubchem.ncbi.nlm.nih.gov) |
| Molecular weight | 4813.0 g/mol (pubchem.ncbi.nlm.nih.gov) |
| PubChem CID | 166567236 (pubchem.ncbi.nlm.nih.gov) |
| Storage (lyophilised) | -20 °C, dry, protected from light (sigmaaldrich.com) |

## Sizes and prices at Sable

| Vial | Price | Per mg | UK same-size check (2026-10-16) |
| --- | --- | --- | --- |
| 5 mg | £24.93 | £4.99 | lowest other £24.95 across 1 UK sellers |
| 10 mg | £44.98 | £4.50 | no same-size match |
| 15 mg | £38.98 | £2.60 | no same-size match |
| 20 mg | £40.39 | £2.02 | no same-size match |
| 30 mg | £61.98 | £2.07 | no same-size match |
| 40 mg | £86.98 | £2.17 | no same-size match |
| 60 mg | £119.98 | £2.00 | no same-size match |

Multi-vial pricing on the same item: 3+ vials 10% off, 5+ vials 15% off, 10+ vials 20% off. Every lot has a certificate of analysis: [CoA library](/coa).

## Typical analytical method

| HPLC column | C18 reversed-phase (300 A pore, C4/C8 suitable for large/lipidated) |
| --- | --- |
| Mobile phase | A: water + 0.1% TFA; B: acetonitrile + 0.1% TFA; linear gradient (e.g. 5-65% B over 20-30 min) |
| Detection | 214-220 nm (peptide bond) and 280 nm (Trp/Tyr present) |

General literature method. The lot CoA records the method actually used. [How to read an HPLC chromatogram](/learn/how-to-read-an-hplc-chromatogram).

## Related questions

-   [What is the molecular formula of tirzepatide?](/questions/tirzepatide-molecular-formula)
-   [What is the amino acid sequence of tirzepatide?](/questions/tirzepatide-sequence)
-   [What does Tirzepatide dissolve in?](/questions/tirzepatide-solubility)
-   [How stable is lyophilised Tirzepatide?](/questions/tirzepatide-stability-lyophilised)

## Lyophilised storage on file: Tirzepatide

From the Sable storage reference (lyophilised material only; temperature, light, moisture). Literature basis is linked per row. See [peptide storage](/learn/peptide-storage-and-solubility).

| Compound | Lyophilised storage | Light / notes |
| --- | --- | --- |
| Tirzepatide | -20 C long term (-80 C acceptable), sealed and desiccated; 2-8 C for weeks | protect from light; contains Met/Cys/Trp: oxidation-prone; minimise air/headspace exposure (source) |

## Typical analytical method: Tirzepatide

Reference HPLC and MS conditions from the Sable analytical-methods file; a lot's CoA states the method actually used. See [how to read a CoA](/guides/how-to-read-a-coa).

| Compound | HPLC column / detection | MS / expected ion |
| --- | --- | --- |
| Tirzepatide | C18 reversed-phase (300 A pore, C4/C8 suitable for large/lipidated); 214-220 nm (peptide bond) and 280 nm (Trp/Tyr present) | ESI-MS (positive mode); LC-MS for identity; [M+3H]3+ ~1605.3; [M+4H]4+ ~1204.3; [M+5H]5+ ~963.6; [M+6H]6+ ~803.2 |

Research use only. Not a medicine. Not for human or veterinary use.