AssayIndex

WXT-2602-P5658

BPC-157 · 2 mg declared · WuXi TIDES (WuXi AppTec Testing Division) · manufactured 18 Feb 2026

CHARACTERISED
Lot code
WXT-2602-P5658
Supplier
WXT — WuXi TIDES (WuXi AppTec Testing Division)
Compound
BPC-157
Compound class
Tissue-repair and immunomodulatory peptides
Declared label claim
2mg
Manufacture date
18 Feb 2026
Index quarter
2026-Q1
Independent assays
11
Laboratories involved
Medutest, Janoshik, VendorInvestigate, Kestrel, PeptideMeter
Provenance mix
Buyer-sourced ×5 · Supplier-supplied ×5 · 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 11
Median purity 98.24% n=11
Spread (max − min) 1.82pp n=11
Standard deviation 0.520pp n=11
96.897.397.998.599.099.6100.2This lot (WXT-2602-P5658)This lot (WXT-2602-P5658): Q1 98.22, median 98.24, Q3 98.70, n=11outlier 99.64n=11All BPC-157All BPC-157: Q1 98.59, median 99.15, Q3 99.71, n=591n=591 Purity (% area)
Figure 1. This lot's independent purity results against the whole BPC-157 record set in the index. The vertical line is the index acceptance specification for the tissue-repair and immunomodulatory peptides class, 98.0 % 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 11

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-2026-043477WXT-2602-P5658Medutest2026-Q198.211.5298.1Buyer-sourced2MARGINAL
AX-2026-043478WXT-2602-P5658Janoshik2026-Q198.852.06101.6Supplier-supplied2MARGINAL
AX-2026-043479WXT-2602-P5658VendorInvestigate2026-Q198.221.12Buyer-sourced2MARGINAL
AX-2026-043480WXT-2602-P5658Kestrel2026-Q199.641.9894.6Supplier-supplied3FAIL
AX-2026-043481WXT-2602-P5658PeptideMeter2026-Q198.501.47Supplier-supplied2MARGINAL
AX-2026-043482WXT-2602-P5658Janoshik2026-Q198.181.65103.0Buyer-sourced2MARGINAL
AX-2026-043483WXT-2602-P5658VendorInvestigate2026-Q197.822.3598.2Buyer-sourced2FAIL
AX-2026-043484WXT-2602-P5658Janoshik2026-Q198.242.30Buyer-sourced2MARGINAL
AX-2026-043485WXT-2602-P5658Medutest2026-Q199.152.05106.4Supplier-supplied2MARGINAL
AX-2026-043486WXT-2602-P5658Janoshik2026-Q198.242.01104.4Laboratory-retained2MARGINAL
AX-2026-043487WXT-2602-P5658Janoshik2026-Q198.552.16103.6Supplier-supplied2MARGINAL
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
Medutest298.21, 99.1598.6825min+0.0898.60
Janoshik598.85, 98.18, 98.24, 98.24, 98.5598.2430min+0.0098.24
VendorInvestigate298.22, 97.8298.0232min-0.1198.13
Kestrel199.6499.6415min+0.2499.40
PeptideMeter198.5098.5028min-0.0598.55

This lot contributes 10 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)99.098.21divergence +0.76 pp vs batch median
Total impurities (% area)1.001.79
Largest single impurity (% area)0.611.11
Water (%)0.61.52
Counter-ion (%)5.26.15
Peptide content (%w/w)93.691.62
Endotoxin (EU/mg)0.23not determined
Method stated on certificateNOno method section — the result cannot be reconciled against any other
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-Val]-diastereomer11 / 110.610.05–1.35
pyroglutamate cyclisation (−17 Da)11 / 110.150.05–0.53
truncated (1-12)11 / 110.020.01–0.56
des-Gly truncate (−57 Da)10 / 110.090.03–0.19
acetylated N-terminus (+42 Da)10 / 110.100.01–0.89
BPC-157 arginine-salt artefact9 / 110.040.01–0.06
Section 7

What this rollup does not establish