AssayIndex

BCH-2601-G7069

MK-677 (Ibutamoren mesylate) · 500 mg declared · Bachem Holding (Suzhou) Co., Ltd. · manufactured 07 Jan 2026

CHARACTERISED
Lot code
BCH-2601-G7069
Supplier
BCH — Bachem Holding (Suzhou) Co., Ltd.
Compound
MK-677 (Ibutamoren mesylate)
Compound class
Non-peptide adjuncts
Declared label claim
500mg
Manufacture date
07 Jan 2026
Index quarter
2026-Q1
Independent assays
14
Laboratories involved
Janoshik, VendorInvestigate, PeptideMeter, Nordanalyt, Kestrel
Provenance mix
Buyer-sourced ×5 · 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 14
Median purity 97.93% n=14
Spread (max − min) 1.29pp n=14
Standard deviation 0.405pp n=14
96.997.498.098.599.199.6100.2This lot (BCH-2601-G7069)This lot (BCH-2601-G7069): Q1 97.51, median 97.92, Q3 98.15, n=14n=14All MK-677 (Ibutamoren mesylate)All MK-677 (Ibutamoren mesylate): Q1 98.51, median 99.37, Q3 99.77, n=152n=152 Purity (% area)
Figure 1. This lot's independent purity results against the whole MK-677 (Ibutamoren mesylate) record set in the index. The vertical line is the index acceptance specification for the non-peptide adjuncts class, 98.5 % 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 14

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-2026-043545BCH-2601-G7069Janoshik2026-Q198.024.0296.7Supplier-supplied1FAIL
AX-2026-043546BCH-2601-G7069VendorInvestigate2026-Q197.104.4398.3Buyer-sourced1FAIL
AX-2026-043547BCH-2601-G7069PeptideMeter2026-Q198.333.67Supplier-supplied1FAIL
AX-2026-043548BCH-2601-G7069VendorInvestigate2026-Q197.963.64103.3Buyer-sourced1FAIL
AX-2026-043549BCH-2601-G7069Janoshik2026-Q197.894.72Supplier-supplied1FAIL
AX-2026-043550BCH-2601-G7069PeptideMeter2026-Q197.713.5898.3Buyer-sourced1FAIL
AX-2026-043551BCH-2601-G7069Janoshik2026-Q198.193.36106.5Supplier-supplied1FAIL
AX-2026-043552BCH-2601-G7069VendorInvestigate2026-Q197.394.3496.1Buyer-sourced1FAIL
AX-2026-043553BCH-2601-G7069Nordanalyt2026-Q198.013.91Supplier-supplied1FAIL
AX-2026-043554BCH-2601-G7069Kestrel2026-Q198.394.0690.4Supplier-supplied2FAIL
AX-2026-043555BCH-2601-G7069Janoshik2026-Q197.363.41104.8Supplier-supplied1FAIL
AX-2026-043556BCH-2601-G7069Janoshik2026-Q198.303.6188.8Supplier-supplied2FAIL
AX-2026-043557BCH-2601-G7069Janoshik2026-Q197.474.2693.4Buyer-sourced1FAIL
AX-2026-043558BCH-2601-G7069PeptideMeter2026-Q197.633.64Supplier-supplied1FAIL
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
Janoshik698.02, 97.89, 98.19, 97.36, 98.30, 97.4797.9530min+0.0097.95
VendorInvestigate397.10, 97.96, 97.3997.3932min-0.1197.50
PeptideMeter398.33, 97.71, 97.6397.7128min-0.0597.76
Nordanalyt198.0198.0135min+0.0297.99
Kestrel198.3998.3915min+0.2498.15

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)98.2898.02divergence +0.35 pp vs batch median
Total impurities (% area)1.721.98
Largest single impurity (% area)not stated0.96
Water (%)not stated4.02
Counter-ion (%)not stated15.35
Peptide content (%w/w)not stated79.79
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
spiroindane regioisomer14 / 140.740.37–1.28
sulfonamide hydrolysis product (+18 Da)14 / 140.390.16–0.75
O-desmethyl metabolite analogue (−14 Da)14 / 140.540.23–1.30
residual DMF (process solvent)14 / 140.150.09–0.27
free base (des-mesylate, −96 Da)14 / 140.150.06–0.38
Section 7

What this rollup does not establish