AX-2026-043188

L-Carnosine · 500 mg declared · GL Biochem (Shanghai) Ltd. · lot GLBI-2512-S8438

FAILMETHOD LIMITED

Report ID: AX-2026-043188
Compound: L-Carnosine
Compound class: Short bioregulator peptides
Supplier: GL Biochem — GL Biochem (Shanghai) Ltd.
Batch / lot: GLBI-2512-S8438
Declared label claim: 500mg
Laboratory: Janoshik Analytical
Assay date: 12 May 2026
Submitted: 29 May 2026
Quarter: 2026-Q2
Submitter: import_hold
Sample provenance: Supplier-supplied

Section 1

Results

Measured against the index acceptance specification for the short bioregulator peptides 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	98.77	% area	≥ 99.0	FAIL
Total impurities	RP-HPLC, sum of reported peaks	1.23	% area	≤ 1.0	FAIL
Largest single impurity	RP-HPLC — D-carnosine epimer	0.72	% area	≤ 1.00	PASS
Identity	not ordered on this submission	not determined	—	required for VERIFIED status	NOT TESTED
Total peptide content	by difference from the gravimetric mass balance	90.05	%w/w	—	NOT TESTED
Target-compound content	total peptide content × purity	88.94	%w/w	—	NOT TESTED
Gross fill (as weighed)	five-place balance, under nitrogen	516.54	mg	500 mg declared	NOT TESTED
Recovered target peptide	gross fill × target content	459.411	mg	500 mg claim	NOT TESTED
Recovery against label claim	recovered ÷ claim	91.9	%	90.0 – 110.0	PASS
Water content	Karl Fischer, coulometric, duplicate	9.21	%	≤ 12.0	PASS
Counter-ion	no ionisable counter-ion expected	N/A	—	not applicable	NOT TESTED
Residual solvent + inorganic residue	estimated — see /methods/residual-solvents-q3c/	0.74	%	—	NOT TESTED
Endotoxin	not ordered on this submission	not determined	—	≤ 5.0	NOT TESTED
Sterility	not ordered on this submission	not determined	—	no growth	NOT TESTED
Appearance	visual, diffuse light, black and white background	White to pale-yellow cake, intact	—	white to off-white intact cake	PASS
Reconstitution clarity	reconstituted per submitter procedure	Clear, colourless, no visible particulates	—	clear, no visible particulates	PASS
pH (reconstituted, 1 mg/mL)	potentiometric, two-point calibration	7.13	—	2.5 – 8.0	PASS
Retention time (observed)	RP-HPLC, 30 min gradient	3.67	min	3.72 ± 0.20 (normalised)	PASS
Peak asymmetry (10 % height)	Ph. Eur. 2.2.46	1.28	—	0.80 – 1.50	PASS
Plate count, main peak	N = 5.54 (t/w½)²	88,023	—	≥ 20,000	PASS
Resolution to nearest impurity	vs D-carnosine epimer	1.18	—	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, 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 88,023, and skew follows the reported asymmetry factor of 1.28. 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 0.72 % impurity against a 98.77 % 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	L-Carnosine — main peak	3.67	4,800,528	98.77	—
2	D-carnosine epimer	3.61	34,994	0.72	0.000
3	β-alanine (−137 Da)	3.45	10,693	0.22	-137.059
4	anserine (methylcarnosine, +14 Da)	3.79	8,263	0.17	+14.016
5	free histidine (−71 Da)	3.51	5,832	0.12	-71.037
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 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	9.21
Counter-ion	none expected	0.00
Residual solvent + inorganic residue	estimated	0.74
Total peptide content	by difference	90.05
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)	100.0	98.77	divergence +1.23 pp vs batch median
Total impurities (% area)	0.00	1.23
Largest single impurity (% area)	0.00	0.72
Water (%)	not stated	9.21
Counter-ion (%)	not stated	N/A
Peptide content (%w/w)	91.7	90.05
Endotoxin (EU/mg)	0.31	not determined
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: Supplier-supplied
Evidentiary weight: Weaker evidence. Read with the caveat below.
Chain of custody: Supplier despatch → laboratory direct (courier, cold pack, 11 d) → assay. Submitter did not handle the vial.
Assay date: 12 May 2026
Submitted to the index: 29 May 2026
Laboratory: Janoshik Analytical, Ostrava, Czechia
Method basis: 30 min gradient · high-resolution MS
Verification status: METHOD LIMITED

What this report does not establish

That the compound is the compound named. No identity confirmation was ordered on this submission. A purity figure describes chromatographic homogeneity of whatever eluted; it does not name it.
That the material is free of bacterial endotoxin. Endotoxin was not measured. No chromatographic result bears on it.
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

No annotations on this record. Annotations are short signed technical comments from index contributors; see how to contribute.

Section 7

Related records

Same batch — lot GLBI-2512-S8438 n=1

This is the only report on this lot. One report is not a batch characterisation.

Batch rollup and reproducibility assessment →

Cross-sections

Other recent L-Carnosine records in the index.
Report	Supplier	Lot	Lab	Quarter	Purity %	Water %	Recovery %	Provenance	Flags	Result
AX-2026-043283	CPC	CPC-2603-G1651	Medutest	2026-Q3	98.10	10.12	91.8	Supplier-supplied	1	FAIL
AX-2026-043289	CPC	CPC-2603-G1651	Janoshik	2026-Q3	98.01	10.52	—	Buyer-sourced	1	FAIL
AX-2026-043287	CPC	CPC-2603-G1651	Janoshik	2026-Q3	98.35	9.89	93.2	Supplier-supplied	2	FAIL
AX-2026-043286	CPC	CPC-2603-G1651	Janoshik	2026-Q3	98.53	10.02	—	Supplier-supplied	1	FAIL
AX-2026-043285	CPC	CPC-2603-G1651	Janoshik	2026-Q3	98.05	10.42	—	Supplier-supplied	1	FAIL
AX-2026-043288	CPC	CPC-2603-G1651	PeptideMeter	2026-Q3	99.03	9.94	105.1	Supplier-supplied	1	MARGINAL
AX-2026-043281	CPC	CPC-2603-G1651	Nordanalyt	2026-Q3	98.24	10.17	—	Supplier-supplied	1	FAIL
AX-2026-043282	CPC	CPC-2603-G1651	VendorInvestigate	2026-Q3	97.64	10.07	—	Buyer-sourced	1	FAIL

Other recent GL Biochem records in the index.
Report	Compound	Lot	Lab	Quarter	Purity %	Water %	Recovery %	Provenance	Flags	Result
AX-2026-043176	Kisspeptin-10	GLBI-2608-N8085	Medutest	2026-Q3	98.22	3.30	92.5	Buyer-sourced	2	FAIL
AX-2026-043180	Kisspeptin-10	GLBI-2608-N8085	Janoshik	2026-Q3	98.69	3.37	103.8	Supplier-supplied	2	MARGINAL
AX-2026-043178	Kisspeptin-10	GLBI-2608-N8085	Janoshik	2026-Q3	98.24	4.44	96.0	Supplier-supplied	2	FAIL
AX-2026-043177	Kisspeptin-10	GLBI-2608-N8085	Janoshik	2026-Q3	98.31	3.87	106.5	Buyer-sourced	2	FAIL
AX-2026-043202	Semaglutide	GLBI-2602-U8631	PeptideMeter	2026-Q3	96.77	6.38	89.7	Supplier-supplied	3	FAIL
AX-2026-043174	Kisspeptin-10	GLBI-2608-N8085	Medutest	2026-Q3	98.18	4.09	—	Laboratory-retained	2	FAIL
AX-2026-043201	Semaglutide	GLBI-2602-U8631	Janoshik	2026-Q3	96.91	5.77	91.2	Supplier-supplied	2	FAIL
AX-2026-043203	Semaglutide	GLBI-2602-U8631	Medutest	2026-Q3	97.45	6.09	—	Supplier-supplied	2	MARGINAL