AssayIndex

GGPE-2511-W9618

Retatrutide · 10 mg declared · Nantong Guangyuan Chemical Co., Ltd. · manufactured 20 Nov 2025

CHARACTERISED
Lot code
GGPE-2511-W9618
Supplier
GGPeps — Nantong Guangyuan Chemical Co., Ltd.
Compound
Retatrutide
Compound class
Incretin analogues and co-agonists
Declared label claim
10mg
Manufacture date
20 Nov 2025
Index quarter
2026-Q1
Independent assays
13
Laboratories involved
Nordanalyt, Medutest, Janoshik, VendorInvestigate, Kestrel, PeptideMeter
Provenance mix
Buyer-sourced ×4 · Supplier-supplied ×9
Section 1

Reproducibility across independent tests

Every report below is an observation of the same physical material. What they disagree about is measurement; what they agree about is the lot. The size of the disagreement is compared against what the contributing laboratories' own repeatability figures predict.

Independent assays 13
Median purity 97.56% n=13
Spread (max − min) 2.68pp n=13
Standard deviation 0.609pp n=13
95.196.096.897.798.699.4100.3This lot (GGPE-2511-W9618)This lot (GGPE-2511-W9618): Q1 97.38, median 97.56, Q3 97.69, n=13outlier 96.42outlier 98.19outlier 99.10n=13All RetatrutideAll Retatrutide: Q1 97.75, median 98.41, Q3 98.87, n=496outlier 95.45outlier 95.54outlier 95.67outlier 95.97n=496 Purity (% area)
Figure 1. This lot's independent purity results against the whole Retatrutide record set in the index. The vertical line is the index acceptance specification for the incretin analogues and co-agonists class, 96.5 % area. A narrow box on the top row against a wide box on the bottom row is the ideal reading: it means the disagreement between lots is much larger than the disagreement within this one.
Section 2

Member reports 13

Every report the index holds on this lot. Each is a page carrying its own chromatogram, mass spectrum, mass balance, provenance and caveats.

ReportLotLabQuarterPurity %Water %Recovery %ProvenanceFlagsResult
AX-2026-042714GGPE-2511-W9618Nordanalyt2026-Q198.195.80Supplier-supplied1MARGINAL
AX-2026-042715GGPE-2511-W9618Medutest2026-Q197.445.75Supplier-supplied1MARGINAL
AX-2026-042716GGPE-2511-W9618Janoshik2026-Q197.626.1995.9Supplier-supplied1MARGINAL
AX-2026-042717GGPE-2511-W9618Janoshik2026-Q197.846.74Supplier-supplied1MARGINAL
AX-2026-042718GGPE-2511-W9618VendorInvestigate2026-Q197.565.43104.4Buyer-sourced1MARGINAL
AX-2026-042719GGPE-2511-W9618Janoshik2026-Q197.695.5797.0Supplier-supplied1MARGINAL
AX-2026-042720GGPE-2511-W9618Janoshik2026-Q197.656.0296.3Supplier-supplied1MARGINAL
AX-2026-042721GGPE-2511-W9618Janoshik2026-Q197.265.57Supplier-supplied1MARGINAL
AX-2026-042722GGPE-2511-W9618Kestrel2026-Q199.105.30Supplier-supplied2FAIL
AX-2026-042723GGPE-2511-W9618Janoshik2026-Q197.206.55Supplier-supplied1MARGINAL
AX-2026-042724GGPE-2511-W9618PeptideMeter2026-Q197.386.30Buyer-sourced1MARGINAL
AX-2026-042725GGPE-2511-W9618VendorInvestigate2026-Q196.425.5891.4Buyer-sourced1FAIL
AX-2026-042726GGPE-2511-W9618Medutest2026-Q197.395.5688.6Buyer-sourced2MARGINAL
Section 3

By laboratory

Where more than one laboratory assayed this lot, the difference between them is a paired observation of their relative bias — the same material, the same time window, different instruments. Those pairs are what the index's bias estimates are built from.

LaboratoryReportsPurity results (% area)MedianGradientPublished bias (pp)Bias-adjusted
Nordanalyt198.1998.1935min+0.0298.17
Medutest297.44, 97.3997.4125min+0.0897.33
Janoshik697.62, 97.84, 97.69, 97.65, 97.26, 97.2097.6430min+0.0097.64
VendorInvestigate297.56, 96.4296.9932min-0.1197.10
Kestrel199.1099.1015min+0.2498.86
PeptideMeter197.3897.3828min-0.0597.43

This lot contributes 15 paired comparisons to the inter-lab analysis.

Section 4

The supplier's certificate for this lot

One number the supplier wrote, beside the median of the numbers other people measured on the same physical material. That comparison is only available because the index groups by lot.

FigureSupplier COAThis reportIndex note
Purity (% area)97.6298.19divergence +0.06 pp vs batch median
Total impurities (% area)2.381.81
Largest single impurity (% area)not stated1.30
Water (%)not stated5.80
Counter-ion (%)not stated6.92
Peptide content (%w/w)not statednot determined
Endotoxin (EU/mg)0.350.62
Method stated on certificateYEScolumn, gradient and wavelength given
Section 5

Impurity fingerprint

The named impurities reported across this lot's assays, with how consistently each was seen. A fingerprint is what allows two lot numbers held by different companies to be identified as one bulk.

Named impurityReported inMedian % areaRange
oxidised Trp (+16 Da)13 / 130.710.43–1.88
des-Aib20 analogue13 / 130.450.31–1.63
retatrutide dimer13 / 130.080.05–0.19
[D-Aib2]-diastereomer12 / 130.080.01–0.24
incomplete Fmoc removal (+222 Da)7 / 130.060.03–0.06
aspartimide (−18 Da)7 / 130.030.02–0.03
truncated (5-39)6 / 130.600.49–0.82
C18 diacid regioisomer6 / 130.070.05–0.10
Section 7

What this rollup does not establish