AX-2026-041392 · BPC-157 · QYB lot QYB-2601-D3993

Section 1

Results

Measured against the index acceptance specification for the tissue-repair and immunomodulatory 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	99.37	% area	≥ 98.0	PASS
Total impurities	RP-HPLC, sum of reported peaks	0.63	% area	≤ 2.0	PASS
Largest single impurity	RP-HPLC — pyroglutamate cyclisation (−17 Da)	0.32	% area	≤ 1.00	PASS
Identity — theoretical monoisotopic mass	calculated from molecular formula	1418.7093	Da	—	NOT TESTED
Identity — observed monoisotopic mass	LC-MS, unit resolution (single quadrupole)	1418.7309	Da	—	NOT TESTED
Mass accuracy	observed vs theoretical	+15.2	ppm	± 15	FAIL
Total peptide content	by difference from the gravimetric mass balance	89.66	%w/w	—	NOT TESTED
Target-compound content	total peptide content × purity	89.10	%w/w	—	NOT TESTED
Gross fill (as weighed)	five-place balance, under nitrogen	2.20	mg	2 mg declared	NOT TESTED
Recovered target peptide	gross fill × target content	1.960	mg	2 mg claim	NOT TESTED
Recovery against label claim	recovered ÷ claim	98.0	%	90.0 – 110.0	PASS
Water content	Karl Fischer, coulometric, duplicate	4.24	%	≤ 10.0	PASS
Counter-ion (acetate)	anion-exchange ion chromatography	5.85	%	≤ 12.0	PASS
Residual solvent + inorganic residue	estimated — see /methods/residual-solvents-q3c/	0.25	%	—	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 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	6.09	—	2.5 – 8.0	PASS
Retention time (observed)	RP-HPLC, 25 min gradient	8.15	min	8.14 ± 0.25 (normalised)	PASS
Peak asymmetry (10 % height)	Ph. Eur. 2.2.46	1.08	—	0.80 – 1.50	PASS
Plate count, main peak	N = 5.54 (t/w½)²	72,459	—	≥ 20,000	PASS
Resolution to nearest impurity	vs [D-Val]-diastereomer	0.94	—	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 72,459, and skew follows the reported asymmetry factor of 1.08. 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 0.32 % impurity against a 99.37 % 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	BPC-157 — main peak	8.15	4,829,690	99.37	—
2	pyroglutamate cyclisation (−17 Da)	8.41	15,553	0.32	-17.027
3	acetylated N-terminus (+42 Da)	8.55	6,804	0.14	+42.011
4	des-Gly truncate (−57 Da)	7.87	3,888	0.08	-57.021
5	[D-Val]-diastereomer	8.03	2,916	0.06	0.000
6	truncated (1-12)	7.35	1,458	0.03	-285.132
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 1418.7093 Da, computed from C62H98N16O22. 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 1418.7309 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 (%)
3+	473.9104	473.9176	0.0072	8.0
2+	710.3619	710.3727	0.0108	53.9
1+	1419.7166	1419.7382	0.0216	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	4.24
Counter-ion (acetate)	ion chromatography	5.85
Residual solvent + inorganic residue	estimated	0.25
Total peptide content	by difference	89.66
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)	99.90	99.37	divergence 0.00 pp vs batch median
Total impurities (% area)	0.10	0.63
Largest single impurity (% area)	not stated	0.32
Water (%)	2.2	4.24
Counter-ion (%)	8.6	5.85
Peptide content (%w/w)	88.6	89.66
Endotoxin (EU/mg)	not stated	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: Buyer-sourced
Evidentiary weight: Strongest available evidence in this index.
Chain of custody: Domestic warehouse despatch → submitter (2–8 °C, 7 d) → laboratory (courier, cold pack, 8 d) → assay.
Assay date: 13 Apr 2026
Submitted to the index: 09 May 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.
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 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.

aib_coupling09 May 2026

Hindered couplings are where a synthesis loses purity, and the deletion products they leave are the first thing to look for. On this record they are not there in quantity.

ppm_error09 May 2026

+15.2 ppm is outside the class limit and outside what a calibrated instrument should produce at this mass. Before anyone reads it as a compound difference: calibration drift on Medutest's side is far more likely. The chromatography is normal and retention at 8.15 min is where BPC-157 belongs.

Index data team

Recorded as an identity-not-established finding rather than an identity failure, per rule AX-R01. A re-measurement has been requested from the submitter.

charge_envelope09 May 2026

The charge-state envelope on this record is worth reading before the ppm figure. A deconvolution over a truncated envelope produces exactly this kind of error and is invisible in the summary.

isotope_cluster09 May 2026

At this mass the monoisotopic peak may not be the most intense peak in the cluster. Picking the apex instead of the monoisotopic peak produces a systematic positive error of roughly the size flagged here.

Section 7

Related records

Same batch — lot QYB-2601-D3993 n=13

Report	Lot	Lab	Quarter	Purity %	Water %	Recovery %	Provenance	Flags	Result
AX-2026-041380	QYB-2601-D3993	VendorInvestigate	2026-Q2	99.54	4.75	—	Buyer-sourced	0	PASS
AX-2026-041381	QYB-2601-D3993	Janoshik	2026-Q2	99.93	4.15	102.8	Buyer-sourced	0	PASS
AX-2026-041382	QYB-2601-D3993	Kestrel	2026-Q2	99.93	4.03	88.8	Buyer-sourced	1	MARGINAL
AX-2026-041383	QYB-2601-D3993	Janoshik	2026-Q2	99.86	4.05	91.5	Buyer-sourced	0	PASS
AX-2026-041384	QYB-2601-D3993	PeptideMeter	2026-Q2	99.93	3.51	—	Buyer-sourced	0	PASS
AX-2026-041385	QYB-2601-D3993	Janoshik	2026-Q2	99.90	4.14	104.9	Buyer-sourced	0	PASS
AX-2026-041386	QYB-2601-D3993	Janoshik	2026-Q2	99.78	4.33	—	Buyer-sourced	0	PASS
AX-2026-041387	QYB-2601-D3993	Medutest	2026-Q2	99.93	4.36	102.5	Buyer-sourced	0	PASS
AX-2026-041388	QYB-2601-D3993	Janoshik	2026-Q2	99.93	3.40	100.3	Supplier-supplied	0	PASS
AX-2026-041389	QYB-2601-D3993	PeptideMeter	2026-Q2	99.86	4.14	93.6	Buyer-sourced	0	PASS
AX-2026-041390	QYB-2601-D3993	Kestrel	2026-Q2	99.89	3.56	91.0	Buyer-sourced	0	PASS
AX-2026-041391	QYB-2601-D3993	PeptideMeter	2026-Q2	99.93	4.35	—	Buyer-sourced	0	PASS

Batch rollup and reproducibility assessment →

Cross-sections

Other recent BPC-157 records in the index.
Report	Supplier	Lot	Lab	Quarter	Purity %	Water %	Recovery %	Provenance	Flags	Result
AX-2026-043319	CPC	CPC-2602-W1610	Medutest	2026-Q3	98.82	2.88	103.5	Buyer-sourced	2	MARGINAL
AX-2026-041766	TFS	TFS-{CAT}-1156	Janoshik	2026-Q3	99.54	6.34	—	Buyer-sourced	1	MARGINAL
AX-2026-043445	BCH	BCH-2603-G4350	Nordanalyt	2026-Q3	98.42	4.87	93.6	Buyer-sourced	1	MARGINAL
AX-2026-043440	BCH	BCH-2603-G4350	VendorInvestigate	2026-Q3	98.61	4.11	—	Buyer-sourced	1	MARGINAL
AX-2026-043442	BCH	BCH-2603-G4350	Janoshik	2026-Q3	98.65	4.78	—	Buyer-sourced	1	MARGINAL
AX-2026-043449	BCH	BCH-2603-G4350	Kestrel	2026-Q3	99.74	4.92	91.3	Supplier-supplied	2	MARGINAL
AX-2026-043448	BCH	BCH-2603-G4350	Janoshik	2026-Q3	98.55	4.69	106.9	Buyer-sourced	1	MARGINAL
AX-2026-043318	CPC	CPC-2602-W1610	VendorInvestigate	2026-Q3	98.47	3.12	104.1	Buyer-sourced	1	MARGINAL

Other recent QYB records in the index.
Report	Compound	Lot	Lab	Quarter	Purity %	Water %	Recovery %	Provenance	Flags	Result
AX-2026-041471	PT-141 (Bremelanotide)	QYB-2607-L4875	Janoshik	2026-Q3	99.72	3.75	101.7	Buyer-sourced	0	PASS
AX-2026-041377	Ipamorelin	QYB-2605-H3558	Nordanalyt	2026-Q3	99.93	4.35	—	Buyer-sourced	0	PASS
AX-2026-041427	Retatrutide	QYB-2604-B4920	PeptideMeter	2026-Q3	97.93	2.45	101.7	Buyer-sourced	0	PASS
AX-2026-041428	Retatrutide	QYB-2604-B4920	Janoshik	2026-Q3	98.35	3.20	—	Laboratory-retained	0	PASS
AX-2026-041473	PT-141 (Bremelanotide)	QYB-2607-L4875	PeptideMeter	2026-Q3	99.58	3.74	94.4	Buyer-sourced	0	PASS
AX-2026-041472	PT-141 (Bremelanotide)	QYB-2607-L4875	PeptideMeter	2026-Q3	99.93	3.94	—	Buyer-sourced	0	PASS
AX-2026-041429	Retatrutide	QYB-2604-B4920	Medutest	2026-Q3	98.53	2.69	99.8	Buyer-sourced	1	MARGINAL
AX-2026-041431	Retatrutide	QYB-2604-B4920	Janoshik	2026-Q3	98.63	2.32	94.2	Buyer-sourced	0	PASS