AX-2025-021192 · Retatrutide · PPG lot PPG-2501-B7212

Section 1

Results

Measured against the index acceptance specification for the incretin analogues and co-agonists 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	99.49	% area	≥ 96.5	PASS
Total impurities	RP-HPLC, sum of reported peaks	0.51	% area	≤ 3.5	PASS
Largest single impurity	RP-HPLC — [D-Aib2]-diastereomer	0.30	% area	≤ 1.00	PASS
Identity — theoretical monoisotopic mass	calculated from molecular formula	4728.4871	Da	—	NOT TESTED
Identity — observed monoisotopic mass	LC-MS, unit resolution (single quadrupole)	4728.4039	Da	—	NOT TESTED
Mass accuracy	observed vs theoretical	-17.6	ppm	± 15	FAIL
Total peptide content	by difference from the gravimetric mass balance	85.87	%w/w	—	NOT TESTED
Target-compound content	total peptide content × purity	85.43	%w/w	—	NOT TESTED
Gross fill (as weighed)	five-place balance, under nitrogen	12.11	mg	10 mg declared	NOT TESTED
Recovered target peptide	gross fill × target content	10.346	mg	10 mg claim	NOT TESTED
Recovery against label claim	recovered ÷ claim	103.5	%	90.0 – 110.0	PASS
Water content	Karl Fischer, coulometric, duplicate	4.54	%	≤ 8.0	PASS
Counter-ion (TFA)	anion-exchange ion chromatography	8.59	%	≤ 12.0	PASS
Residual solvent + inorganic residue	estimated — see /methods/residual-solvents-q3c/	1.00	%	—	NOT TESTED
Endotoxin	kinetic chromogenic LAL	0.29	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	White cake, partial shrinkage from vial wall	—	white to off-white intact cake	FAIL
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	3.94	—	2.5 – 8.0	PASS
Retention time (observed)	RP-HPLC, 25 min gradient	17.40	min	17.53 ± 0.50 (normalised)	PASS
Peak asymmetry (10 % height)	Ph. Eur. 2.2.46	1.03	—	0.80 – 1.50	PASS
Plate count, main peak	N = 5.54 (t/w½)²	36,434	—	≥ 20,000	PASS
Resolution to nearest impurity	vs [D-Aib2]-diastereomer	0.49	—	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 36,434, and skew follows the reported asymmetry factor of 1.03. 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 0.30 % impurity against a 99.49 % 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	Retatrutide — main peak	17.40	4,835,522	99.49	—
2	[D-Aib2]-diastereomer	17.22	14,581	0.30	0.000
3	truncated (5-39)	15.80	5,346	0.11	-428.201
4	C18 diacid regioisomer	17.88	3,402	0.07	0.000
5	des-Aib20 analogue	17.03	1,458	0.03	-85.053
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 4728.4871 Da, computed from C221H342N46O68. 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 4728.4039 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+	676.5054	676.4935	-0.0119	7.9
6+	789.0885	789.0746	-0.0139	49.4
5+	946.7047	946.6881	-0.0166	100.0
4+	1183.1291	1183.1083	-0.0208	52.0
3+	1577.1696	1577.1419	-0.0277	7.6

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	4.54
Counter-ion (TFA)	ion chromatography	8.59
Residual solvent + inorganic residue	estimated	1.00
Total peptide content	by difference	85.87
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)	99.23	99.49	divergence +0.05 pp vs batch median
Total impurities (% area)	not stated	0.51
Largest single impurity (% area)	not stated	0.30
Water (%)	not stated	4.54
Counter-ion (%)	4.9	8.59
Peptide content (%w/w)	99.0	85.87
Endotoxin (EU/mg)	0.36	0.29
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 (ambient, 31 d) → laboratory (hand-carried, 5 d) → assay.
Assay date: 15 May 2025
Submitted to the index: 05 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.
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.

sig_figs05 Jun 2025

99.49 % is normalised area, so it is silent on how much peptide is in the vial. Content and water are the numbers that answer that, and both are on this record. Purity is the good news; content is the actionable news.

racemisation_ala05 Jun 2025

Epimerisation during activation produces a diastereomer that is mass-identical and only chromatographically separable. At this gradient length the separation exists, and 99.49 % is net of it.

quarter_over_quarter05 Jun 2025

Single records do not establish trends. Where this supplier's quarterly medians are stable across four quarters, a result like this reads as the process rather than the draw — and the timeline page is where to check that.

selection_bias05 Jun 2025

Provenance handles supplier selection. It does not handle submitter selection, which is the larger confounder and the one the index cannot measure.

Section 7

Related records

Same batch — lot PPG-2501-B7212 n=9

Report	Lot	Lab	Quarter	Purity %	Water %	Recovery %	Provenance	Result
AX-2025-021193	PPG-2501-B7212	VendorInvestigate	2025-Q2	99.25	3.48	104.3	Buyer-sourced	PASS
AX-2025-021194	PPG-2501-B7212	Janoshik	2025-Q2	99.05	3.83	—	Buyer-sourced	PASS
AX-2025-021195	PPG-2501-B7212	Kestrel	2025-Q2	99.86	3.79	93.9	Buyer-sourced	PASS
AX-2025-021196	PPG-2501-B7212	Janoshik	2025-Q2	99.03	4.44	—	Supplier-supplied	PASS
AX-2025-021197	PPG-2501-B7212	Janoshik	2025-Q2	98.99	4.19	103.3	Laboratory-retained	PASS
AX-2025-021198	PPG-2501-B7212	Janoshik	2025-Q2	99.18	4.11	—	Buyer-sourced	PASS
AX-2025-021199	PPG-2501-B7212	Kestrel	2025-Q2	99.93	3.85	—	Buyer-sourced	PASS
AX-2025-021200	PPG-2501-B7212	Janoshik	2025-Q2	99.14	3.68	—	Buyer-sourced	PASS

Batch rollup and reproducibility assessment →

Cross-sections

Other recent Retatrutide records in the index.
Report	Supplier	Lot	Lab	Quarter	Purity %	Water %	Recovery %	Provenance	Result
AX-2026-042437	Homopeptide	HOMO-2605-V4718	Nordanalyt	2026-Q3	98.68	3.67	102.8	Buyer-sourced	PASS
AX-2026-043095	KP	KP-2607-H5774	Janoshik	2026-Q3	95.81	5.48	105.2	Buyer-sourced	FAIL
AX-2026-042282	TFC	TFC-2608-J1156	Janoshik	2026-Q3	98.54	4.27	—	Buyer-sourced	PASS
AX-2026-043094	KP	KP-2607-H5774	PeptideMeter	2026-Q3	96.32	6.40	—	Buyer-sourced	FAIL
AX-2026-042441	Homopeptide	HOMO-2605-V4718	Medutest	2026-Q3	98.93	4.22	—	Buyer-sourced	PASS
AX-2026-041427	QYB	QYB-2604-B4920	PeptideMeter	2026-Q3	97.93	2.45	101.7	Buyer-sourced	PASS
AX-2026-041786	ASY	ASY-{CAT}-2288	VendorInvestigate	2026-Q3	98.78	6.59	—	Buyer-sourced	PASS
AX-2026-041428	QYB	QYB-2604-B4920	Janoshik	2026-Q3	98.35	3.20	—	Laboratory-retained	PASS

Other recent PPG records in the index.
Report	Compound	Lot	Lab	Quarter	Purity %	Water %	Recovery %	Provenance	Flags	Result
AX-2026-043598	Tesamorelin	PPG-2608-A6835	Kestrel	2026-Q3	98.91	2.56	100.3	Buyer-sourced	1	FAIL
AX-2026-043597	Tesamorelin	PPG-2608-A6835	Janoshik	2026-Q3	98.54	1.15	—	Buyer-sourced	0	PASS
AX-2026-043596	Tesamorelin	PPG-2608-A6835	PeptideMeter	2026-Q3	98.74	1.83	105.1	Buyer-sourced	1	MARGINAL
AX-2026-043605	Retatrutide	PPG-2604-X7060	Janoshik	2026-Q2	98.17	4.29	99.7	Buyer-sourced	0	PASS
AX-2026-043601	Retatrutide	PPG-2604-X7060	Janoshik	2026-Q2	98.28	3.96	95.3	Buyer-sourced	0	PASS
AX-2026-043668	AOD-9604	PPG-2602-W8018	PeptideMeter	2026-Q2	99.47	3.06	—	Buyer-sourced	0	PASS
AX-2026-043670	AOD-9604	PPG-2602-W8018	PeptideMeter	2026-Q2	99.56	2.71	104.5	Buyer-sourced	0	PASS
AX-2026-043630	CJC-1295 (no DAC)	PPG-2512-D7211	Janoshik	2026-Q2	99.66	5.11	92.5	Buyer-sourced	0	PASS