AX-2026-043410 · Tesamorelin · WXT lot WXT-2601-A4454

Section 1

Results

Measured against the index acceptance specification for the growth-hormone axis 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, 25 min gradient, 214 nm	97.50	% area	≥ 97.0	PASS
Total impurities	RP-HPLC, sum of reported peaks	2.50	% area	≤ 3.0	PASS
Largest single impurity	RP-HPLC — des-hexenoyl GRF (1-44) (−96 Da)	1.75	% area	≤ 1.00	FAIL
Identity — theoretical monoisotopic mass	calculated from molecular formula	5131.9276	Da	—	NOT TESTED
Identity — observed monoisotopic mass	LC-MS, unit resolution (single quadrupole)	5131.8891	Da	—	NOT TESTED
Mass accuracy	observed vs theoretical	-7.5	ppm	± 15	PASS
Peptide content	not ordered on this submission	not determined	—	required to check label claim	NOT TESTED
Water content	Karl Fischer, coulometric, duplicate	4.23	%	≤ 9.0	PASS
Counter-ion (acetate)	anion-exchange ion chromatography	3.70	%	≤ 12.0	PASS
Residual solvent + inorganic residue	estimated — see /methods/residual-solvents-q3c/	0.40	%	—	NOT TESTED
Endotoxin	kinetic chromogenic LAL	0.39	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, colourless, no visible particulates	—	clear, no visible particulates	PASS
pH (reconstituted, 1 mg/mL)	potentiometric, two-point calibration	5.79	—	2.5 – 8.0	PASS
Retention time (observed)	RP-HPLC, 25 min gradient	13.02	min	13.07 ± 0.40 (normalised)	PASS
Peak asymmetry (10 % height)	Ph. Eur. 2.2.46	1.16	—	0.80 – 1.50	PASS
Plate count, main peak	N = 5.54 (t/w½)²	48,617	—	≥ 20,000	PASS
Resolution to nearest impurity	vs deamidated (+1 Da)	0.96	—	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 48,617, and skew follows the reported asymmetry factor of 1.16. 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 1.75 % impurity against a 97.50 % 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	Tesamorelin — main peak	13.02	4,738,802	97.50	—
2	des-hexenoyl GRF (1-44) (−96 Da)	11.84	85,055	1.75	-96.058
3	Met sulfoxide (+16 Da)	12.49	18,469	0.38	+15.995
4	deamidated (+1 Da)	12.79	9,235	0.19	+0.984
5	truncated (1-40)	11.45	8,749	0.18	-488.259
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 5131.9276 Da, computed from C221H366N72O67S. 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 5131.8891 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 (%)
7+	734.1398	734.1343	-0.0055	7.9
6+	856.3285	856.3221	-0.0064	50.7
5+	1027.3928	1027.3851	-0.0077	100.0
4+	1283.9892	1283.9796	-0.0096	50.4
3+	1711.6498	1711.6370	-0.0128	9.0

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)	97.28	97.50	divergence +0.63 pp vs batch median
Total impurities (% area)	2.72	2.50
Largest single impurity (% area)	1.90	1.75
Water (%)	3.3	4.23
Counter-ion (%)	not stated	3.70
Peptide content (%w/w)	not stated	not determined
Endotoxin (EU/mg)	not stated	0.39
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, 8 d) → assay. Submitter did not handle the vial.
Assay date: 27 Jan 2026
Submitted to the index: 05 Feb 2026
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

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 WXT-2601-A4454 n=8

Report	Lot	Lab	Quarter	Purity %	Water %	Recovery %	Provenance	Flags	Result
AX-2026-043408	WXT-2601-A4454	Janoshik	2026-Q1	96.63	4.05	97.5	Buyer-sourced	1	FAIL
AX-2026-043409	WXT-2601-A4454	Janoshik	2026-Q1	96.14	3.32	—	Buyer-sourced	1	FAIL
AX-2026-043411	WXT-2601-A4454	Janoshik	2026-Q1	97.05	3.56	—	Supplier-supplied	1	MARGINAL
AX-2026-043412	WXT-2601-A4454	VendorInvestigate	2026-Q1	96.66	3.81	89.3	Buyer-sourced	1	FAIL
AX-2026-043413	WXT-2601-A4454	Janoshik	2026-Q1	96.61	4.25	—	Supplier-supplied	1	FAIL
AX-2026-043414	WXT-2601-A4454	PeptideMeter	2026-Q1	97.08	4.84	89.6	Buyer-sourced	2	MARGINAL
AX-2026-043415	WXT-2601-A4454	VendorInvestigate	2026-Q1	95.95	3.89	99.1	Buyer-sourced	1	FAIL

Batch rollup and reproducibility assessment →

Cross-sections

Other recent Tesamorelin records in the index.
Report	Supplier	Lot	Lab	Quarter	Purity %	Water %	Recovery %	Provenance	Flags	Result
AX-2026-042535	ERP	ERP-2604-W7280	Janoshik	2026-Q3	99.19	3.89	92.7	Supplier-supplied	1	MARGINAL
AX-2026-042542	ERP	ERP-2604-W7280	Janoshik	2026-Q3	98.54	4.58	103.1	Supplier-supplied	2	FAIL
AX-2026-042540	ERP	ERP-2604-W7280	Kestrel	2026-Q3	99.72	3.47	103.2	Supplier-supplied	1	MARGINAL
AX-2026-042539	ERP	ERP-2604-W7280	Janoshik	2026-Q3	98.77	4.30	89.9	Buyer-sourced	2	MARGINAL
AX-2026-042544	ERP	ERP-2604-W7280	VendorInvestigate	2026-Q3	98.80	3.88	—	Buyer-sourced	2	FAIL
AX-2026-042534	ERP	ERP-2604-W7280	Janoshik	2026-Q3	99.06	3.90	92.8	Supplier-supplied	1	MARGINAL
AX-2026-042536	ERP	ERP-2604-W7280	Janoshik	2026-Q3	98.43	4.33	107.5	Supplier-supplied	2	FAIL
AX-2026-042543	ERP	ERP-2604-W7280	PeptideMeter	2026-Q3	99.16	4.03	—	Supplier-supplied	0	PASS

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