Purity

98.6%

Vial

3 mL × 10

Lot

GPB-4581

Metabolic · CAS 2381089-83-2

Retatrutide

GIP / GLP-1 / Glucagon Triple Agonist

The pre-filled pen range Ask GpharmaBio for a vial quote

UK & Europe Next-Day Delivery — Order before 1pm.Worldwide Delivery — Estimated delivery within 5–10 days.

The certificate for lot GPB-4581 is published in full further down this page.

Supplied in sealed boxes of 10 vials, one lot to a box. Single vials are not broken out of a box.

Primary sequence

TyrAibGluGlyThrPheThrSerAspTyrSerIleAlaLeuAspLys[γGlu·2×AEEA·C20 diacid]… (39)

Physical data

Molecular formula: C₂₂₁H₃₄₂N₄₆O₆₈
Molecular weight: 4731.42 g/mol
CAS number: 2381089-83-2
Appearance: White to off-white lyophilised cake
Solubility: Soluble in sterile water; clears faster in mildly basic buffer
Storage: Lyophilised: −20 °C, desiccated, protected from light

Certificate of analysis

Lot GPB-4581, in full.

Published here. Nothing to request, nothing behind a form.

GpharmaBio

RESEARCH PEPTIDE LAB

part of GBAGROUP

CERTIFICATE OF ANALYSIS

GPB-4581

PRODUCT: Retatrutide
FILL: 20 mg / 3 mL vial · box of 10
SYNTHESISED: 12 Mar 2026
RELEASED: 20 Mar 2026
RETEST: Mar 2028

IDENTITY

CAS NUMBER: 2381089-83-2
MOLECULAR FORMULA: C₂₂₁H₃₄₂N₄₆O₆₈
MOLECULAR WEIGHT: 4731.42 g/mol

RP-HPLC, C18 2.7 µm 150 × 4.6 mm · 0.1% TFA / MeCN, 5–65% over 30 min · 1.0 mL/min · DAD 214 nm

Analytical purity scaleRP-HPLC area @ 214 nm

98.6%

Measured, this lot

High purity

Release specification ≥ 98.0%

98.6%

9596979899100

Red rule marks the house release limit. This lot sits 0.6 points above it. Area percent cannot see anything without a chromophore at 214 nm, which is why moisture, counterion and net peptide content are reported separately below.

TEST	RESULT, THIS LOT
RP-HPLC purity	98.6% area @ 214 nm
Identity (ESI-MS)	4731.9 observed, deconvoluted
Correct acylation	99.1% — single site, full linker
Net peptide content	76.8%
Water (Karl Fischer)	4.4%
Bacterial endotoxin	< 0.25 EU/mg (LAL)

Security code

F5K0-FGKX

Verified by AUTHENTIX®

This is the sheet for the lot on the shelf — not a representative document. If the lot number moves on before you order, the page moves with it.

Handling

Reconstitute down the vial wall and swirl — the lipid arm foams if shaken.
Stable ~14 days at 2–8 °C in solution; do not freeze once reconstituted.
Hygroscopic cake; recap immediately after weighing.

For laboratory research use only. Not for human or veterinary consumption, diagnostic or therapeutic use.

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