AX-2025-019879 · MK-677 (Ibutamoren mesylate) · HJ lot HJ-2501-G5680

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, 25 min gradient, 214 nm	99.93	% area	≥ 98.5	PASS
Total impurities	RP-HPLC, sum of reported peaks	0.07	% area	≤ 1.5	PASS
Largest single impurity	RP-HPLC — free base (des-mesylate, −96 Da)	0.04	% area	≤ 1.00	PASS
Identity — theoretical monoisotopic mass	calculated from molecular formula	624.2181	Da	—	NOT TESTED
Identity — observed monoisotopic mass	LC-MS, unit resolution (single quadrupole)	624.2092	Da	—	NOT TESTED
Mass accuracy	observed vs theoretical	-14.3	ppm	± 10	FAIL
Peptide content	not ordered on this submission	not determined	—	required to check label claim	NOT TESTED
Water content	Karl Fischer, coulometric, duplicate	5.65	%	≤ 10.0	PASS
Counter-ion (mesylate)	anion-exchange ion chromatography	15.19	%	≤ 12.0	FAIL
Residual solvent + inorganic residue	estimated — see /methods/residual-solvents-q3c/	0.53	%	—	NOT TESTED
Endotoxin	kinetic chromogenic LAL	0.15	EU/mg	≤ 5.0	PASS
Sterility	not ordered on this submission	not determined	—	no growth	NOT TESTED
Appearance	visual, diffuse light, black and white background	Off-white lyophilised cake, intact	—	white to off-white intact cake	PASS
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	4.92	—	2.5 – 8.0	PASS
Retention time (observed)	RP-HPLC, 25 min gradient	11.57	min	11.73 ± 0.30 (normalised)	PASS
Peak asymmetry (10 % height)	Ph. Eur. 2.2.46	1.13	—	0.80 – 1.50	PASS
Plate count, main peak	N = 5.54 (t/w½)²	67,144	—	≥ 20,000	PASS
Resolution to nearest impurity	vs free base (des-mesylate, −96 Da)	0.18	—	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, 25 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 67,144, and skew follows the reported asymmetry factor of 1.13. 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 0.04 % impurity against a 99.93 % 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	11.57	4,856,908	99.93	—
2	free base (des-mesylate, −96 Da)	11.60	1,944	0.04	-96.011
3	sulfonamide hydrolysis product (+18 Da)	10.85	1,458	0.03	+18.011
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, unit-resolution instrument. Sticks are placed at m/z = (M + z × 1.007276)/z for the observed neutral mass of 624.2092 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	313.1119	-0.0044	54.9
1+	625.2254	625.2165	-0.0089	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.

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)	99.77	99.93	divergence +0.04 pp vs batch median
Total impurities (% area)	not stated	0.07
Largest single impurity (% area)	not stated	0.04
Water (%)	not stated	5.65
Counter-ion (%)	3.4	15.19
Peptide content (%w/w)	92.5	not determined
Endotoxin (EU/mg)	not stated	0.15
Method stated on certificate	YES	—	column, gradient and wavelength given

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: Buyer-sourced
Evidentiary weight: Strongest available evidence in this index.
Chain of custody: Retail purchase → submitter (−20 °C, 26 d) → laboratory (courier, dry ice, 10 d) → assay.
Assay date: 30 May 2025
Submitted to the index: 04 Jun 2025
Laboratory: Medutest, Ljubljana, Slovenia
Method basis: 25 min gradient · unit-resolution MS
Verification status: IDENTITY CONSISTENT

What this report does not establish

That the compound is not a near-isobaric alternative. Identity was confirmed at unit mass resolution, which cannot exclude species differing by 1 or 2 Da. The specific alternatives not excluded are named in the identity block above.
How much of the named compound is in the vial. Peptide content was not determined, so recovered mass cannot be calculated and the label claim cannot be checked.
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 5

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.

gradient_2504 Jun 2025

The gradient is on the record, which is the first thing that should be true of any purity figure and often is not. 25 min at Medutest puts this comparison on a documented footing.

sodium_adduct04 Jun 2025

An unrecognised sodium adduct shifts an apparent monoisotopic mass by about 22 Da, which at this molecular weight is far more than -14.3 ppm. Rule that out first; it is the cheapest check available.

buyer_sourced04 Jun 2025

Anyone can generate one of these. That is the argument the index makes on its submission page and it is the reason the dataset grows without any supplier's cooperation.

valley_drop04 Jun 2025

free base (des-mesylate, −96 Da) at 0.04 % elutes close enough to the main peak that drop-line and valley-to-valley will not agree. The index prints the resolution figure and applies no criterion to it — how close the nearest impurity sits is a property of the compound and the gradient, not of the system. What matters is that the convention used is stated.

counterion_mol04 Jun 2025

Worth flagging to whoever submits next on this lot.

Section 7

Related records

Same batch — lot HJ-2501-G5680 n=9

Report	Lot	Lab	Quarter	Purity %	Water %	Recovery %	Provenance	Result
AX-2025-019877	HJ-2501-G5680	VendorInvestigate	2025-Q2	99.85	5.51	91.1	Buyer-sourced	FAIL
AX-2025-019878	HJ-2501-G5680	Medutest	2025-Q2	99.93	5.75	—	Buyer-sourced	FAIL
AX-2025-019880	HJ-2501-G5680	Janoshik	2025-Q2	99.46	5.41	—	Buyer-sourced	FAIL
AX-2025-019881	HJ-2501-G5680	PeptideMeter	2025-Q2	99.42	4.81	—	Laboratory-retained	FAIL
AX-2025-019882	HJ-2501-G5680	Kestrel	2025-Q2	99.93	5.42	—	Buyer-sourced	FAIL
AX-2025-019883	HJ-2501-G5680	Medutest	2025-Q2	99.16	5.35	91.3	Buyer-sourced	FAIL
AX-2025-019884	HJ-2501-G5680	Janoshik	2025-Q2	99.67	5.44	103.4	Buyer-sourced	FAIL
AX-2025-019885	HJ-2501-G5680	PeptideMeter	2025-Q2	99.73	5.39	98.8	Supplier-supplied	FAIL

Batch rollup and reproducibility assessment →

Cross-sections

All MK-677 (Ibutamoren mesylate) records n=143
All HJ records n=247
All Medutest records n=934
All 2025-Q2 records n=619
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-2026-041633	FGP	FGP-2604-K8509	PeptideMeter	2026-Q2	99.81	4.91	96.2	Buyer-sourced	0	FAIL
AX-2026-041733	TFS	TFS-{CAT}-1096	PeptideMeter	2026-Q2	99.07	3.93	95.1	Laboratory-retained	0	FAIL
AX-2026-043468	BCH	BCH-2511-G5204	Medutest	2026-Q2	98.85	4.30	96.5	Buyer-sourced	1	FAIL
AX-2026-042647	SWB	SWB-2605-B7365	Nordanalyt	2026-Q2	99.28	2.86	93.1	Buyer-sourced	0	FAIL
AX-2026-041634	FGP	FGP-2604-K8509	PeptideMeter	2026-Q2	99.86	5.17	—	Buyer-sourced	0	FAIL
AX-2026-043469	BCH	BCH-2511-G5204	Medutest	2026-Q2	98.51	4.86	—	Buyer-sourced	1	FAIL
AX-2026-042648	SWB	SWB-2605-B7365	Janoshik	2026-Q2	99.93	2.60	96.9	Supplier-supplied	0	FAIL
AX-2026-041732	TFS	TFS-{CAT}-1096	Janoshik	2026-Q2	99.48	3.16	106.4	Buyer-sourced	0	FAIL

Other recent HJ records in the index.
Report	Compound	Lot	Lab	Quarter	Purity %	Water %	Recovery %	Provenance	Flags	Result
AX-2026-042595	Semaglutide	HJ-2608-C7002	Janoshik	2026-Q3	99.50	3.55	—	Buyer-sourced	1	MARGINAL
AX-2026-042598	Semaglutide	HJ-2608-C7002	Janoshik	2026-Q3	99.59	3.84	—	Buyer-sourced	0	PASS
AX-2026-042605	Semaglutide	HJ-2608-C7002	Janoshik	2026-Q3	99.03	3.37	107.3	Buyer-sourced	0	PASS
AX-2026-042602	Semaglutide	HJ-2608-C7002	Nordanalyt	2026-Q3	99.21	3.50	92.0	Buyer-sourced	0	PASS
AX-2026-042603	Semaglutide	HJ-2608-C7002	Janoshik	2026-Q3	99.16	3.42	105.9	Buyer-sourced	0	PASS
AX-2026-042528	GHRP-6	HJ-2603-R5329	VendorInvestigate	2026-Q3	98.69	1.87	95.8	Buyer-sourced	0	FAIL
AX-2026-042526	GHRP-6	HJ-2603-R5329	Medutest	2026-Q3	99.37	3.06	—	Laboratory-retained	0	PASS
AX-2026-042527	GHRP-6	HJ-2603-R5329	VendorInvestigate	2026-Q3	99.21	2.77	93.2	Buyer-sourced	0	PASS