AssayIndex

ERP-2601-F9816

GHK-Cu · 50 mg declared · Shanghai ERP Biotechnology Co., Ltd. · manufactured 16 Jan 2026

CHARACTERISED
Lot code
ERP-2601-F9816
Supplier
ERP — Shanghai ERP Biotechnology Co., Ltd.
Compound
GHK-Cu
Compound class
Tissue-repair and immunomodulatory peptides
Declared label claim
50mg
Manufacture date
16 Jan 2026
Index quarter
2026-Q2
Independent assays
10
Laboratories involved
Janoshik, Nordanalyt, PeptideMeter, Kestrel, VendorInvestigate
Provenance mix
Buyer-sourced ×8 · Laboratory-retained ×2
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 10
Median purity 98.65% n=10
Spread (max − min) 0.91pp n=10
Standard deviation 0.257pp n=10
96.897.397.998.498.999.5100.0This lot (ERP-2601-F9816)This lot (ERP-2601-F9816): Q1 98.53, median 98.65, Q3 98.76, n=10outlier 98.02n=10All GHK-CuAll GHK-Cu: Q1 98.19, median 98.56, Q3 99.05, n=72n=72 Purity (% area)
Figure 1. This lot's independent purity results against the whole GHK-Cu record set in the index. The vertical line is the index acceptance specification for the tissue-repair and immunomodulatory peptides class, 97.0 % 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 10

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-2026-042707ERP-2601-F9816Janoshik2026-Q298.534.7096.3Buyer-sourced1MARGINAL
AX-2026-042708ERP-2601-F9816Nordanalyt2026-Q298.883.8791.5Buyer-sourced1MARGINAL
AX-2026-042709ERP-2601-F9816PeptideMeter2026-Q298.653.9994.6Buyer-sourced1MARGINAL
AX-2026-042710ERP-2601-F9816Nordanalyt2026-Q298.654.2499.6Buyer-sourced1MARGINAL
AX-2026-042711ERP-2601-F9816Kestrel2026-Q298.533.8489.7Laboratory-retained2MARGINAL
AX-2026-042712ERP-2601-F9816PeptideMeter2026-Q298.483.08100.3Buyer-sourced1MARGINAL
AX-2026-042713ERP-2601-F9816VendorInvestigate2026-Q298.023.75Buyer-sourced2FAIL
AX-2026-042714ERP-2601-F9816Kestrel2026-Q298.934.31106.7Buyer-sourced2MARGINAL
AX-2026-042715ERP-2601-F9816Nordanalyt2026-Q298.653.9198.7Buyer-sourced1MARGINAL
AX-2026-042716ERP-2601-F9816PeptideMeter2026-Q298.804.3792.0Laboratory-retained1MARGINAL
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
Janoshik198.5398.5330min+0.0098.53
Nordanalyt398.88, 98.65, 98.6598.6535min+0.0298.63
PeptideMeter398.65, 98.48, 98.8098.6528min-0.0598.70
Kestrel298.53, 98.9398.7315min+0.2498.49
VendorInvestigate198.0298.0232min-0.1198.13

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)99.098.53divergence +0.35 pp vs batch median
Total impurities (% area)1.001.47
Largest single impurity (% area)0.390.62
Water (%)not stated4.70
Counter-ion (%)5.1N/A
Peptide content (%w/w)90.894.80
Endotoxin (EU/mg)not statednot 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
GHK-Cu 2:1 complex10 / 100.570.45–0.84
oxidised His (+16 Da)10 / 100.300.09–0.70
Gly-His dipeptide (−128 Da)10 / 100.180.14–0.26
apo-GHK (copper-free, −62 Da)10 / 100.290.12–0.55
Section 7

What this rollup does not establish