AX-2025-021027 · MK-677 (Ibutamoren mesylate) · WXT lot WXT-2502-F3530

Section 1

Results

Measured against the index acceptance specification for the non-peptide adjuncts class. A specification is a decision the index made; a result is a measurement. See where each threshold came from.

Parameter	Method	Result	Unit	Index spec
Purity	RP-HPLC, 30 min gradient, 214 nm	99.66	% area	≥ 98.5	PASS
Total impurities	RP-HPLC, sum of reported peaks	0.34	% area	≤ 1.5	PASS
Largest single impurity	RP-HPLC — residual DMF (process solvent)	0.14	% area	≤ 1.00	PASS
Identity — theoretical monoisotopic mass	calculated from molecular formula	624.2181	Da	—	NOT TESTED
Identity — observed monoisotopic mass	LC-MS, high resolution (ESI-TOF/QTOF)	624.2216	Da	—	NOT TESTED
Mass accuracy	observed vs theoretical	+5.6	ppm	± 10	PASS
Total peptide content	by difference from the gravimetric mass balance	79.69	%w/w	—	NOT TESTED
Target-compound content	total peptide content × purity	79.42	%w/w	—	NOT TESTED
Gross fill (as weighed)	five-place balance, under nitrogen	1168.27	mg	1000 mg declared	NOT TESTED
Recovered target peptide	gross fill × target content	927.840	mg	1000 mg claim	NOT TESTED
Recovery against label claim	recovered ÷ claim	92.8	%	90.0 – 110.0	PASS
Water content	Karl Fischer, coulometric, duplicate	4.43	%	≤ 10.0	PASS
Counter-ion (mesylate)	anion-exchange ion chromatography	15.35	%	≤ 12.0	FAIL
Residual solvent + inorganic residue	estimated — see /methods/residual-solvents-q3c/	0.53	%	—	NOT TESTED
Endotoxin	kinetic chromogenic LAL	9.50	EU/mg	≤ 5.0	FAIL
Sterility	not ordered on this submission	not determined	—	no growth	NOT TESTED
Appearance	visual, diffuse light, black and white background	White cake, partially collapsed	—	white to off-white intact cake	FAIL
Reconstitution clarity	reconstituted per submitter procedure	Clear after 90 s gentle swirling, no particulates	—	clear, no visible particulates	PASS
pH (reconstituted, 1 mg/mL)	potentiometric, two-point calibration	4.29	—	2.5 – 8.0	PASS
Retention time (observed)	RP-HPLC, 30 min gradient	13.82	min	13.86 ± 0.30 (normalised)	PASS
Peak asymmetry (10 % height)	Ph. Eur. 2.2.46	1.17	—	0.80 – 1.50	PASS
Plate count, main peak	N = 5.54 (t/w½)²	61,265	—	≥ 20,000	PASS
Resolution to nearest impurity	vs free base (des-mesylate, −96 Da)	0.17	—	no index criterion	REPORTED

Section 2

Chromatogram and peak integration

The figure is drawn from the table. It is not an independent illustration — if a number in the table changed, the trace would change with it.

Figure 1. RP-HPLC trace, 30 min gradient, 214 nm. Drawn from the peak-integration table below: peak positions are the reported retention times, peak areas are the reported area percentages, peak widths follow the reported plate count of 61,265, and skew follows the reported asymmetry factor of 1.17. Baseline noise is seeded from the report ID and is illustrative. The lower panel is the same trace at a stated vertical expansion with the slow gradient drift subtracted, because at full scale a 0.14 % impurity against a 99.66 % main peak is a line two pixels tall; the main peak runs off-scale there by design.

#	Peak	RT	Area (µV·s)	% area	Δ mass (Da)
1	MK-677 (Ibutamoren mesylate) — main peak	13.82	4,843,785	99.66	—
2	residual DMF (process solvent)	5.62	6,804	0.14	-551.000
3	sulfonamide hydrolysis product (+18 Da)	12.96	6,804	0.14	+18.011
4	O-desmethyl metabolite analogue (−14 Da)	13.30	1,458	0.03	-14.016
5	free base (des-mesylate, −96 Da)	13.86	1,458	0.03	-96.011
Closure check — purity + Σ impurities				100.00	CLOSES

Reporting threshold 0.05 % area. Peaks below it are not reported and are therefore excluded from the total, which overstates purity by their sum — see peak integration.

Section 3

Mass spectrum and identity

Theoretical monoisotopic mass 624.2181 Da, computed from C27H36N4O5S · CH4O3S. All ppm figures on this site are against monoisotopic values — see why that matters.

Figure 2. ESI charge-state envelope, high-resolution instrument. Sticks are placed at m/z = (M + z × 1.007276)/z for the observed neutral mass of 624.2216 Da. Sodium (+21.982/z) and potassium (+37.956/z) adducts are shown where the parent charge state exceeds 25 % relative abundance; they are adducts of the same molecule and are not impurities.

Charge	Theoretical m/z	Observed m/z	Δ m/z	Rel. abundance (%)
2+	313.1163	313.1181	0.0018	52.1
1+	625.2254	625.2289	0.0035	100.0

Section 4

Gravimetric mass balance

Water, counter-ion, residual and total peptide content are exhaustive and mutually exclusive categories. They must account for 100 % of the cake mass. The index closes this to within 0.02 pp and the build asserts it.

Component	Determination	%w/w of cake
Water	Karl Fischer	4.43
Counter-ion (mesylate)	ion chromatography	15.35
Residual solvent + inorganic residue	estimated	0.53
Total peptide content	by difference	79.69
Total		100.00 CLOSES

Supplier certificate, as declared

The supplier's own figures for this lot, beside the independent measurement. Divergence is assessed against the batch median, not against this single report — see rule AX-R05.

Figure	Supplier COA	This report	Index note
Purity (% area)	99.57	99.66	divergence +0.09 pp vs batch median
Total impurities (% area)	0.43	0.34
Largest single impurity (% area)	0.23	0.14
Water (%)	3.9	4.43
Counter-ion (%)	not stated	15.35
Peptide content (%w/w)	not stated	79.69
Endotoxin (EU/mg)	4.55	9.50
Method stated on certificate	NO	—	no method section — the result cannot be reconciled against any other

Section 5

Provenance and caveats

Where a sample came from changes the weight of the evidence. The index treats it as a first-class field.

Sample provenance: Supplier-supplied
Evidentiary weight: Weaker evidence. Read with the caveat below.
Chain of custody: Supplier despatch → laboratory direct (courier, cold pack, 10 d) → assay. Submitter did not handle the vial.
Assay date: 24 Jan 2025
Submitted to the index: 03 Feb 2025
Laboratory: Janoshik Analytical, Ostrava, Czechia
Method basis: 30 min gradient · high-resolution MS
Verification status: VERIFIED

What this report does not establish

That the material is sterile. Sterility was not tested.
That any other vial in the same lot has the same composition. One vial was tested. Within-lot vial-to-vial variation in this index has a median of 0.28 pp and a 90th percentile of 0.74 pp.
That any other lot from the same supplier has the same composition. Batch-to-batch variation is larger than within-batch variation for every supplier here.
That the material is suitable for administration to a human or an animal. These are research compounds. No result on this site is a safety assessment and the index takes no position on use.
That the material was manufactured by the supplier that sold it. Contract synthesis is normal in this market and twenty-nine batches in the index fingerprint to a bulk from a different company than the one named on the label.

Section 6

Annotations 4

Signed technical comments from index contributors. Not a discussion forum — annotations question or contextualise the result, and the data team replies where a reply is warranted.

lal_assay03 Feb 2025

9.50 EU/mg is above the index screening threshold of 5.0. Two things to keep separate: the index threshold is a screening figure, and a real limit is dose-dependent. The endotoxin dose-limit calculator does that arithmetic. What this record establishes is that the burden is measurable and high relative to the rest of the dataset.

oxidation_ladder03 Feb 2025

No endotoxin figure on this record, which is true of roughly three quarters of the index. It is the one measurement that cannot be inferred from any other and the one most often omitted.

moq_reality03 Feb 2025

9.50 EU/mg is elevated relative to the index median and the record shows no depyrogenation step. If this material will be reconstituted in aqueous buffer for any downstream use, that endotoxin load is a risk.

coa_gap03 Feb 2025

Purity 99.66 % and endotoxin 9.50 EU/mg are unrelated — purity measures synthesis quality, endotoxin measures fill-step water quality. The combination here is coherent and expected together.

Section 7

Related records

Same batch — lot WXT-2502-F3530 n=4

Report	Lot	Lab	Quarter	Purity %	Water %	Recovery %	Provenance	Flags	Result
AX-2025-021025	WXT-2502-F3530	Medutest	2025-Q1	99.60	4.31	—	Supplier-supplied	1	FAIL
AX-2025-021026	WXT-2502-F3530	PeptideMeter	2025-Q1	99.28	5.44	93.0	Supplier-supplied	1	FAIL
AX-2025-021028	WXT-2502-F3530	Janoshik	2025-Q1	99.36	3.90	—	Supplier-supplied	1	FAIL

Batch rollup and reproducibility assessment →

Cross-sections

All MK-677 (Ibutamoren mesylate) records n=152
All WXT records n=353
All Janoshik records n=3159
All 2025-Q1 records n=702
MK-677 (Ibutamoren mesylate) by supplier
MK-677 (Ibutamoren mesylate) impurity profile

Other recent MK-677 (Ibutamoren mesylate) records in the index.
Report	Supplier	Lot	Lab	Quarter	Purity %	Water %	Recovery %	Provenance	Flags	Result
AX-2026-043524	BCH	BCH-2511-G7276	Janoshik	2026-Q2	98.36	4.68	—	Supplier-supplied	1	FAIL
AX-2026-041764	FGP	FGP-2604-K1470	Janoshik	2026-Q2	99.93	5.34	—	Supplier-supplied	1	FAIL
AX-2026-043527	BCH	BCH-2511-G7276	Janoshik	2026-Q2	98.35	4.36	95.5	Supplier-supplied	1	FAIL
AX-2026-042409	SWB	SWB-2605-B4738	Medutest	2026-Q2	99.32	2.99	94.9	Laboratory-retained	1	FAIL
AX-2026-043526	BCH	BCH-2511-G7276	Medutest	2026-Q2	97.60	4.50	—	Buyer-sourced	1	FAIL
AX-2026-042410	SWB	SWB-2605-B4738	Janoshik	2026-Q2	99.61	2.81	—	Supplier-supplied	1	FAIL
AX-2026-041765	FGP	FGP-2604-K1470	Janoshik	2026-Q2	99.93	5.08	—	Supplier-supplied	0	FAIL
AX-2026-043525	BCH	BCH-2511-G7276	Medutest	2026-Q2	98.37	4.32	—	Buyer-sourced	1	FAIL

Other recent WXT records in the index.
Report	Compound	Lot	Lab	Quarter	Purity %	Water %	Recovery %	Provenance	Flags	Result
AX-2026-043488	Pramlintide	WXT-2603-D6052	Janoshik	2026-Q3	97.87	4.37	—	Supplier-supplied	1	MARGINAL
AX-2026-043406	Semaglutide	WXT-2604-C4728	Janoshik	2026-Q3	97.24	4.65	—	Supplier-supplied	1	MARGINAL
AX-2026-043421	Sermorelin	WXT-2608-P4867	Janoshik	2026-Q3	98.15	3.09	—	Supplier-supplied	0	PASS
AX-2026-043420	Sermorelin	WXT-2608-P4867	Medutest	2026-Q3	98.62	3.07	96.4	Supplier-supplied	0	PASS
AX-2026-043423	Sermorelin	WXT-2608-P4867	Janoshik	2026-Q3	98.28	3.86	98.5	Buyer-sourced	0	PASS
AX-2026-043401	Semaglutide	WXT-2604-C4728	Medutest	2026-Q3	97.70	4.78	91.5	Supplier-supplied	1	MARGINAL
AX-2026-043400	Semaglutide	WXT-2604-C4728	Nordanalyt	2026-Q3	96.86	4.11	106.4	Laboratory-retained	1	FAIL
AX-2026-043422	Sermorelin	WXT-2608-P4867	Medutest	2026-Q3	98.35	3.59	—	Supplier-supplied	1	MARGINAL