AssayIndex

KP-2607-H5219

Retatrutide · 10 mg declared · Zhuhai Kerui Biotechnology Co., Ltd. · manufactured 13 Jul 2026

CHARACTERISED
Lot code
KP-2607-H5219
Supplier
KP — Zhuhai Kerui Biotechnology Co., Ltd.
Compound
Retatrutide
Compound class
Incretin analogues and co-agonists
Declared label claim
10mg
Manufacture date
13 Jul 2026
Index quarter
2026-Q3
Independent assays
16
Laboratories involved
Janoshik, Medutest, Kestrel, Nordanalyt, VendorInvestigate, PeptideMeter
Provenance mix
Buyer-sourced ×4 · Supplier-supplied ×11 · Laboratory-retained ×1
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 16
Median purity 96.14% n=16
Spread (max − min) 1.94pp n=16
Standard deviation 0.486pp n=16
95.196.096.897.798.699.4100.3This lot (KP-2607-H5219)This lot (KP-2607-H5219): Q1 96.06, median 96.13, Q3 96.48, n=16outlier 97.39n=16All 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 16

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-2026-043027KP-2607-H5219Janoshik2026-Q396.325.9389.6Supplier-supplied3FAIL
AX-2026-043028KP-2607-H5219Janoshik2026-Q396.526.09Supplier-supplied2MARGINAL
AX-2026-043029KP-2607-H5219Medutest2026-Q395.455.71Supplier-supplied2FAIL
AX-2026-043030KP-2607-H5219Kestrel2026-Q395.976.9597.1Supplier-supplied2FAIL
AX-2026-043031KP-2607-H5219Medutest2026-Q396.285.38Buyer-sourced2FAIL
AX-2026-043032KP-2607-H5219Nordanalyt2026-Q396.695.87Supplier-supplied2MARGINAL
AX-2026-043033KP-2607-H5219VendorInvestigate2026-Q395.545.7791.8Buyer-sourced2FAIL
AX-2026-043034KP-2607-H5219Janoshik2026-Q396.135.5390.5Supplier-supplied2FAIL
AX-2026-043035KP-2607-H5219Janoshik2026-Q396.786.45106.3Supplier-supplied2MARGINAL
AX-2026-043036KP-2607-H5219Janoshik2026-Q395.675.8594.5Buyer-sourced2FAIL
AX-2026-043037KP-2607-H5219Janoshik2026-Q396.095.9695.3Supplier-supplied2FAIL
AX-2026-043038KP-2607-H5219Janoshik2026-Q396.476.07Supplier-supplied2FAIL
AX-2026-043039KP-2607-H5219Janoshik2026-Q396.145.62Supplier-supplied2FAIL
AX-2026-043040KP-2607-H5219VendorInvestigate2026-Q396.135.86Laboratory-retained2FAIL
AX-2026-043041KP-2607-H5219Kestrel2026-Q397.395.8498.9Supplier-supplied2MARGINAL
AX-2026-043042KP-2607-H5219PeptideMeter2026-Q396.115.60Buyer-sourced2FAIL
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
Janoshik896.32, 96.52, 96.13, 96.78, 95.67, 96.09, 96.47, 96.1496.2330min+0.0096.23
Medutest295.45, 96.2895.8725min+0.0895.79
Kestrel295.97, 97.3996.6815min+0.2496.44
Nordanalyt196.6996.6935min+0.0296.67
VendorInvestigate295.54, 96.1395.8432min-0.1195.95
PeptideMeter196.1196.1128min-0.0596.16

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)96.3796.32divergence +0.23 pp vs batch median
Total impurities (% area)3.633.68
Largest single impurity (% area)not stated1.77
Water (%)3.45.93
Counter-ion (%)9.27.59
Peptide content (%w/w)96.785.78
Endotoxin (EU/mg)0.88not determined
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
[D-Aib2]-diastereomer16 / 160.480.16–1.31
des-Aib20 analogue16 / 160.180.06–0.48
truncated (5-39)16 / 161.220.18–2.76
aspartimide (−18 Da)16 / 160.230.08–0.41
incomplete Fmoc removal (+222 Da)16 / 160.370.06–0.83
C18 diacid regioisomer8 / 161.831.26–2.19
oxidised Trp (+16 Da)8 / 160.030.03–0.04
Section 7

What this rollup does not establish