PT-141 lab tests

271 certificates of analysis for PT-141 are on file — 270 for single vials and 1 for blends and other forms — from 172 shops and 22 labs. The latest was tested on 21 Sep 2026.

These are certificates shops have chosen to publish, verified for authenticity before listing. Because shops decide which COAs to make public, the set reflects the batches they published rather than every production batch — a selection bias we state openly. What shop COAs show →

Tests on file

271

270 single vials · 1 blends & other forms

Median purity

99.82%

usual 99.21–99.94% · shop COAs

Measured vs label

106%

median · 8 under 90% · 29 over 120%

Latest test

21 Sep 2026

22 labs · 172 shops

Look up your vial's lot →PT-141 prices →PT-141 calculator Get a vial tested

What PT-141 results look like

single vials only · 268 purity results · 266 measured-content results

Purity is tightly bunched: the middle 80% of results sit within 0.7 points. Measured content spreads across 23 points of the label.

HPLC purity

99.21–99.94%middle 80% of results

median 99.82%98% at 99% or higher1 under 98%

% HPLC purity

Measured content vs label

97–120%middle 80% of results

median 106%8 under 90%29 over 120%

% of the labelled amount

outside the usual rangeEndotoxin reported on 46 of 270 (17%)Confirmed on the lab's own portal: 69 (26%)Most tested size: 10 mg (254)

Latest PT-141 tests

10 most recent · all formsAll 271 ↓

Latest PT-141 lab tests
Tested	Shop	Lab	Purity	Measured vs label	Endotoxin	Record
21 Sep 2026	Rogue Compounds	ILS Laboratories	99.94%	10.61 / 10 mg 106% of label	—	PT-260808-001✓
21 Sep 2026	DNA Peptides	SideChain Analytics	99.70%	10.55 / 10 mg 106% of label	—	DNA-PT14110-2609-01✓
18 Sep 2026	Backroad Aminos	freedomdiagnosticstesting.com	99.95%	12.43 / 10 mg 124% of label	Pass	0926PT10✓
5 Sep 2026	Luv Aminos	freedomdiagnosticstesting.com	99.92%	11.52 / 10 mg 115% of label	—	PT141-10-001✓
1 Sep 2026	NorthStar Compounds	Kovera Labs	99.82%	10.53 / 10 mg 105% of label	—	PT12601✓
28 Aug 2026	Vistara Labs	—	99.76%	10.32 / 10 mg 103% of label	—	00011/0011
26 Aug 2026	10 Bottle Value	—	99.80%	11.1 / 10 mg 111% of label	Pass	3utebtf
19 Aug 2026	Coastal Peptides	Kovera Labs	99.41%	10.38 / 10 mg 104% of label	—	PT141-0826A✓
12 Aug 2026	Peptide Plugs	freedomdiagnosticstesting.com	99.86%	9.65 / 10 mg 97% of label	Pass	135-03-2B✓
3 Aug 2026	BioEdge Research Labs	Kovera Labs	99.51%	11.14 / 10 mg 111% of label	Pass	062026PT10✓

98% or higher95–98%90–95%under 90%✓ found on the lab's own portalHover an endotoxin chip for the lab's exact wording

Results by lab

single vials · labs with the most PT-141 tests

PT-141 single-vial results by testing lab
Lab	Tests	Median purity	Median measured vs label	Endotoxin reported	Confirmed on lab portal
freedomdiagnosticstesting.com	69	99.91%	107%	11	26
Janoshik Labs	65	99.87%	110%	0	12
Vanguard Laboratory	24	99.66%	101%	5	1
Kovera Labs	17	99.74%	111%	9	11
Chromate	15	99.73%	107%	3	6
Bioviridian	11	99.80%	102%	2	1
ILS Laboratories	11	99.89%	106%	4	10
MDx BioAnalytical Laboratory	11	99.80%	102%	3	1

Differences reflect the vials each lab received and how it reports — this is not a ranking of labs. Every lab with a PT-141 test on file is linked under More on PT-141.

What PT-141 testing has to rule out

PT-141 (bremelanotide) is a cyclic heptapeptide analogue of α-MSH, Ac-Nle-cyclo-(Asp-His-D-Phe-Arg-Trp-Lys-OH) per the FDA label: CAS 189691-06-3 (PubChem CID 9941379), formula C₅₀H₆₈N₁₄O₁₀, molecular weight 1,025.2 g/mol. The approved drug substance is bremelanotide acetate, C₅₀H₆₈N₁₄O₁₀ · xCH₃COOH (1 ≤ x ≤ 2).

Melanotan II shares the identical backbone, the Asp5-to-Lys10 lactam bridge, the norleucine at position 4 and the D-phenylalanine at position 7. The only structural difference is the C-terminal group: a free acid on bremelanotide, a lysine amide on melanotan II (C₅₀H₆₉N₁₅O₉, 1,024.18). About 1.0 dalton on 1,025 is under 0.1%, so the two co-elute on HPLC and nominal-mass mass spectrometry cannot resolve them reliably. Only high-resolution MS or MS/MS fragmentation establishes which molecule is in the vial, which makes the instrument type as important as the number reported: a nominal-mass instrument reporting "1,025" is reporting a number it cannot defend to the decimal that matters. The risk runs one way — someone ordering bremelanotide can receive melanotan II, a substance approved in no country, with a flawless purity certificate.

The substitution has a published forensic literature. Mestria et al. (Drug Testing and Analysis, 2021) characterised black-market melanotan II and bremelanotide by LC-HRMS, and Breindahl et al. (Drug Testing and Analysis, 2015) identified and characterised melanotan II products sold illegally online.

On quantity, this platform's PT-141 data (verified August 2026) ran from −3.3% to +16.3% against the label, and two vendors returned the top figure: a 30 mg label that tested at 34.9 mg, and a 10 mg label that tested at 11.63 mg. Endotoxin results were mostly absent. The 99.70% average purity across 242 tests recorded at the same date is the least informative figure on this compound, because a pure sample of melanotan II returns the same chromatogram.

High-resolution MS or MS/MS fragmentation at 1,025.2 Da on the batch, with the instrument type stated — not 1,024.18 (melanotan II).
The salt form stated: a certificate that does not say whether it quotes free base or acetate is quoting a mass that cannot be used. Acid versus amide is the identity question; the acetate counter-ion is a separate axis on top of it.
Quantitative content testing: +16.3% over label is on record, 34.9 mg in a 30 mg label.
An LAL endotoxin result on the batch — a field blank is common on this compound.

All PT-141 tests

272 records · 1 supplier-provided, listed and left out of the benchmarks · newest first · blends tagged

272 records · 1 supplier-provided, listed and left out of the benchmarks, most recent first.
Tested	Shop	Lab	Purity	Measured vs label	Endotoxin	Record
21 Sep 2026	Rogue Compounds	ILS Laboratories	99.94%	10.61 / 10 mg 106% of label	—	PT-260808-001✓
21 Sep 2026	DNA Peptides	SideChain Analytics	99.70%	10.55 / 10 mg 106% of label	—	DNA-PT14110-2609-01✓
18 Sep 2026	Backroad Aminos	freedomdiagnosticstesting.com	99.95%	12.43 / 10 mg 124% of label	Pass	0926PT10✓
5 Sep 2026	Luv Aminos	freedomdiagnosticstesting.com	99.92%	11.52 / 10 mg 115% of label	—	PT141-10-001✓
1 Sep 2026	NorthStar Compounds	Kovera Labs	99.82%	10.53 / 10 mg 105% of label	—	PT12601✓
28 Aug 2026	Vistara Labs	—	99.76%	10.32 / 10 mg 103% of label	—	00011/0011
26 Aug 2026	10 Bottle Value	—	99.80%	11.1 / 10 mg 111% of label	Pass	3utebtf
19 Aug 2026	Coastal Peptides	Kovera Labs	99.41%	10.38 / 10 mg 104% of label	—	PT141-0826A✓
12 Aug 2026	Peptide Plugs	freedomdiagnosticstesting.com	99.86%	9.65 / 10 mg 97% of label	Pass	135-03-2B✓
3 Aug 2026	BioEdge Research Labs	Kovera Labs	99.51%	11.14 / 10 mg 111% of label	Pass	062026PT10✓
31 Jul 2026	PeptuviaSupplier-provided	Janoshik Labs	99.82%	11.69 / 10 mg 117% of label	—	PGB-PT141-3✓
28 Jul 2026	NuLife Peptides	freedomdiagnosticstesting.com	99.82%	9.67 / 10 mg 97% of label	Pass	NLPT10501✓
24 Jul 2026	Zen Aminos	freedomdiagnosticstesting.com	99.84%	10.09 / 10 mg 101% of label	—	ZAP-PT03✓
21 Jul 2026	Backroad Aminos	Kovera Labs	99.55%	11.29 / 10 mg 113% of label	—	BA-07142026PT10✓
17 Jul 2026	Ramp Peptides	freedomdiagnosticstesting.com	99.90%	9.6 / 10 mg 96% of label	—	PT141 10 RP01✓
16 Jul 2026	Phase One Labz	ILS Laboratories	99.80%	10.57 / 10 mg 106% of label	—	P1-141-26✓
16 Jul 2026	Kalyx Labs	freedomdiagnosticstesting.com	99.96%	10.11 / 10 mg 101% of label	—	P41-B01✓
13 Jul 2026	Pure Amino	ILS Laboratories	99.88%	10.57 / 10 mg 106% of label	Reported	PA25021602✓
13 Jul 2026	Double R Labs	Kovera Labs	99.70%	10.09 / 10 mg 101% of label	Pass	DRL-07-PT10
9 Jul 2026	Biopeptitech	Accurate Test Lab	99.92%	34.9 / 30 mg 116% of label	—	BPTS62926PT141
9 Jul 2026	Ascend Science	Kovera Labs	99.43%	11.63 / 10 mg 116% of label	—	C50H68N14O1D✓
6 Jul 2026	My Amino Lab	Kovera Labs	99.33%	10.87 / 10 mg 109% of label	—	V2606-PT10-2401✓
6 Jul 2026	Modified Aminos	Ethos Analytics	99.00%	10.04 / 10 mg 100% of label	Pass	MA-PTP-100
2 Jul 2026	Blank Peptides	Horizon Analytical	99.21%	10.12 / 10 mg 101% of label	—	B-3230947-P
29 Jun 2026	EZ Peps	ILS Laboratories	99.81%	10.24 / 10 mg 102% of label	—	26-A5-10PT / 9761096✓
25 Jun 2026	Peptide Partners	Kovera Labs	99.74%	13.1 / 10 mg 131% of label	Pass	PT202605✓
24 Jun 2026	Elevated Peptides	MZ Biolabs	99.81%	not reported	—	2026-06-16
24 Jun 2026	Umbrella Labs	freedomdiagnosticstesting.com	99.85%	11.08 / 10 mg 111% of label	—	ULP-30011✓
19 Jun 2026	Ktechpeptide	Janoshik Labs	99.95%	11.01 / 10 mg 110% of label	—	2026-6✓
18 Jun 2026	Optimum Formula	ILS Laboratories	99.89%	10.69 / 10 mg 107% of label	Pass	#LNC2M✓
18 Jun 2026	Research Chem HQ	ILS Laboratories	99.89%	10.59 / 10 mg 106% of label	Pass	#HX7CL✓
18 Jun 2026	Research Chem HQ	ILS Laboratories	99.89%	10.69 / 10 mg 107% of label	Pass	#LNC2J✓
17 Jun 2026	American Peptides	Bioviridian	99.90%	10.13 / 10 mg 101% of label	Pass	PT141-0528
15 Jun 2026	Oasis Labs	Bioviridian	99.90%	10.37 / 10 mg 104% of label	—	112455✓
15 Jun 2026	LA Peptides	Bioviridian	99.90%	10.27 / 10 mg 103% of label	Pass	1318
14 Jun 2026	Nura Peptide	freedomdiagnosticstesting.com	99.81%	9.96 / 10 mg 100% of label	Pass	PT1-062026-1✓
11 Jun 2026	Imagine First Labs	Horizon Analytical	99.23%	10.09 / 10 mg 101% of label	—	IFL-3230947-P
10 Jun 2026	Modern Research Peptides	freedomdiagnosticstesting.com	99.93%	9.47 / 10 mg 95% of label	—	6R8221F✓
9 Jun 2026	Glow Aminos	ILS Laboratories	99.32%	10.4 / 10 mg 104% of label	—	GL-010144✓
1 Jun 2026	Warrior Makers	Testides	99.21%	11.53 / 10 mg 115% of label	Pass	11253-SG5
29 May 2026	EZ Peptides	Janoshik Labs	99.92%	11.39 / 10 mg 114% of label	—	EZP-PT1005172026-08✓
29 May 2026	Ameano Peptides	Janoshik Labs	99.93%	11.44 / 10 mg 114% of label	—	AMP-PT1005172026-08✓
29 May 2026	EVO Labs Research	Kovera Labs	99.67%	11.33 / 10 mg 113% of label	—	EVO5213026
28 May 2026	GenPeptide	Chromate	99.65%	11.66 / 10 mg 117% of label	—	GPPTX10052526✓
28 May 2026	Adria Science	liquilabs	99.80%	10.86 / 10 mg 109% of label	—	20267121
27 May 2026	Good Science	Vanguard Laboratory	99.00%	9.92 / 10 mg 99% of label	Pass	3548279
27 May 2026	Glowing Peptides	Janoshik Labs	99.85%	10.45 / 10 mg 105% of label	—	C200
26 May 2026	Alpha Peptides	Analytical Formulations Inc	99.60%	11.7 / 10 mg 117% of label	—	PT-51826528
26 May 2026	Elutide	Horizon Analytical	99.36%	9.75 / 10 mg 98% of label	—	E-9495443-P
23 May 2026	Ascension Peptides	Kovera Labs	99.26%	10.96 / 10 mg 110% of label	Pass	28-05260628✓
21 May 2026	Everest Peptides	freedomdiagnosticstesting.com	99.91%	9.84 / 10 mg 98% of label	—	EVR-PT10-2605-001
19 May 2026	True Research Labs	Horizon Analytical	99.36%	9.75 / 10 mg 98% of label	—	TRL-9495443
15 May 2026	Sunrise Bioresearch	ILS Laboratories	99.89%	10.57 / 10 mg 106% of label	—	PT10MAY26-01✓
13 May 2026	Reta One Labs	Kovera Labs	99.86%	11 / 10 mg 110% of label	Pass	PT100526
11 May 2026	Warrior Makers	MZ Biolabs	99.88%	not reported	—	11253-SG5
8 May 2026	S1 Research	freedomdiagnosticstesting.com	99.93%	10.76 / 10 mg 108% of label	Pass	PT05052651✓
6 May 2026	KOLD Peptides	Accumark Labs	99.92%	11.04 / 10 mg 110% of label	—	1250
6 May 2026	RUO.bio	Vanguard Laboratory	99.01%	9.77 / 10 mg 98% of label	—	PT402
6 May 2026	Arcane Peptides	Vanguard Laboratory	99.01%	9.77 / 10 mg 98% of label	—	PT402
4 May 2026	PeptideTech	freedomdiagnosticstesting.com	99.94%	10.44 / 10 mg 104% of label	Pass	PTM10-1115✓
4 May 2026	Oneday Compounds	ILS Laboratories	99.87%	10.3 / 10 mg 103% of label	—	OC-PT10-101✓
3 May 2026	Real Peptides	freedomdiagnosticstesting.com	99.87%	10.22 / 10 mg 102% of label	—	View record →
2 May 2026	Gentleman Peptides	Bioviridian	99.90%	10.21 / 10 mg 102% of label	—	View record →
30 Apr 2026	Restore Peptides	Janoshik Labs	99.80%	10.75 / 10 mg 108% of label	—	View record →
30 Apr 2026	24Peptides	liquilabs	99.80%	11.84 / 10 mg 118% of label	Reported	GF-PT141-10-B241
30 Apr 2026	Glacier Aminos	Kovera Labs	99.82%	9.78 / 10 mg 98% of label	Pass	PTGA-03
29 Apr 2026	GenPeptide	Chromate	99.36%	12.07 / 10 mg 121% of label	—	GPPTX10042226✓
27 Apr 2026	Corix Labs	Janoshik Labs	99.90%	10.25 / 10 mg 102% of label	—	421-PT141-10✓
27 Apr 2026	BioLongevity Labs	MDx BioAnalytical Laboratory	99.78%	4.99 / 5 mg 100% of label	Pass	25-3-43136
25 Apr 2026	Idun Peptides	freedomdiagnosticstesting.com	99.92%	10.27 / 10 mg 103% of label	—	PT10-260331✓
25 Apr 2026	Studz Peptides	Kovera Labs	99.82%	12.61 / 10 mg 126% of label	—	PT1410-04192026-LIS✓
24 Apr 2026	Precisely Peptides	Vanguard Laboratory	99.35%	12.46 / 10 mg 125% of label	—	PP412-26-001
23 Apr 2026	Offline Peptides	freedomdiagnosticstesting.com	99.88%	10.04 / 10 mg 100% of label	—	OP-P41-0426✓
23 Apr 2026	Puratek Peptides	freedomdiagnosticstesting.com	99.96%	9.54 / 10 mg 95% of label	Pass	PT10001✓
23 Apr 2026	Precisely Peptides	Vanguard Laboratory	99.80%	9.9 / 10 mg 99% of label	—	PP412-26-001
23 Apr 2026	Precisely Peptides	Vanguard Laboratory	99.80%	31.79 / 30 mg 106% of label	—	PP412-26-001
23 Apr 2026	Precisely Peptides	Vanguard Laboratory	99.80%	11.13 / 10 mg 111% of label	—	PP412-26-001
23 Apr 2026	Precisely Peptides	Vanguard Laboratory	99.80%	19.96 / 20 mg 100% of label	—	PP412-26-001
23 Apr 2026	Precisely Peptides	Vanguard Laboratory	99.80%	30.19 / 30 mg 101% of label	—	PP412-26-001
23 Apr 2026	Precisely Peptides	Vanguard Laboratory	99.80%	55.15 / 50 mg 110% of label	—	PP412-26-001
22 Apr 2026	Saiyan Med	Janoshik Labs	99.98%	10.1 / 10 mg 101% of label	—	SYM-P41-B2604✓
16 Apr 2026	NG Peptide	ILS Laboratories	99.95%	10.49 / 10 mg 105% of label	—	PT10-1639
15 Apr 2026	Enhanced Peptides	Vanguard Laboratory	99.68%	10.21 / 10 mg 102% of label	—	PT28-4156
14 Apr 2026	Silverstone Labs Co	Kovera Labs	99.80%	11.73 / 10 mg 117% of label	Pass	PT-0426✓
12 Apr 2026	Pure Health Peptides	Ethos Analytics	99.00%	10.13 / 10 mg 101% of label	—	TUY-030926
12 Apr 2026	Peptide Plugs	freedomdiagnosticstesting.com	99.86%	8.58 / 10 mg 86% of label	—	112-U
12 Apr 2026	Go Alpha Labs	freedomdiagnosticstesting.com	99.97%	10.69 / 10 mg 107% of label	—	LO07-10
11 Apr 2026	Plum Labs Research	Kovera Labs	99.95%	11.89 / 10 mg 119% of label	Pass	PLY-PT-101✓
10 Apr 2026	Instant Peptides	Kovera Labs	99.90%	10.84 / 10 mg 108% of label	—	2026-0236-B
7 Apr 2026	Valor Peptides	Accumark Labs	99.84%	13.51 / 10 mg 135% of label	—	PT0001
4 Apr 2026	Purity Peptides	MDx BioAnalytical Laboratory	99.79%	10.32 / 10 mg 103% of label	Pass	View record →
2 Apr 2026	Core Peptides	Vanguard Laboratory	99.19%	10 / 10 mg 100% of label	—	C73492✓
30 Mar 2026	Evolve Biopep	Ethos Analytics	98.00%	10.46 / 10 mg 105% of label	Pass	EP-260323-H10
28 Mar 2026	Elite Research USA	BioRegen	99.55%	11.2 / 10 mg 112% of label	—	4042SY0326
27 Mar 2026	Signum Scientific	Horizon Analytical	99.55%	9.95 / 10 mg 99% of label	—	PT-10-01
27 Mar 2026	Zen Aminos	Horizon Analytical	99.55%	9.95 / 10 mg 99% of label	—	ZA-7652730
26 Mar 2026	Peptide Pros	Bioviridian	99.90%	11.23 / 10 mg 112% of label	—	PTV-031626
25 Mar 2026	Growth Guys	Janoshik Labs	99.85%	10.78 / 10 mg 108% of label	—	PT03
24 Mar 2026	Peptide Crafters	Vanguard Laboratory	99.15%	9.98 / 10 mg 100% of label	—	PC-G1-PT141
23 Mar 2026	Nexaph	Janoshik Labs	99.89%	11.55 / 10 mg 116% of label	—	PT1003092026-07
22 Mar 2026	Modified Aminos	Ethos Analytics	—	10.09 / 10 mg 101% of label	Pass	MA-PT1S-101
20 Mar 2026	Tydes	Janoshik Labs	99.92%	9.63 / 10 mg 96% of label	—	PT10031126
19 Mar 2026	Pure Health Peptides	Bioviridian	99.80%	10.24 / 10 mg 102% of label	—	CHA-022626
17 Mar 2026	Glow Aminos	freedomdiagnosticstesting.com	99.83%	11.29 / 10 mg 113% of label	Pass	GL-010072✓
17 Mar 2026	Oath Peptides	freedomdiagnosticstesting.com	99.77%	11.4 / 10 mg 114% of label	—	B0526
15 Mar 2026	Peptide Foundry	freedomdiagnosticstesting.com	99.87%	9.09 / 10 mg 91% of label	—	PT312✓
14 Mar 2026	GenPeptide	freedomdiagnosticstesting.com	99.77%	10.63 / 10 mg 106% of label	—	GPPTX10030526✓
14 Mar 2026	Luvion Bio Peptides	freedomdiagnosticstesting.com	99.83%	8.8 / 10 mg 88% of label	—	LBL-1125-P41-1052
13 Mar 2026	New Wave Peptides	Janoshik Labs	99.89%	10.29 / 10 mg 103% of label	—	20070/A
12 Mar 2026	Vandl Labs	Vanguard Laboratory	99.26%	9.54 / 10 mg 95% of label	—	View record →
10 Mar 2026	Vi Corpus	Janoshik Labs	99.87%	10.71 / 10 mg 107% of label	—	VCAU26.1
6 Mar 2026	Panda Peptides	Janoshik Labs	99.86%	10.96 / 10 mg 110% of label	—	View record →
6 Mar 2026	Chameleon PeptidesClosed	Janoshik Labs	99.86%	10.96 / 10 mg 110% of label	—	View record →
5 Mar 2026	Glacier Aminos	Kovera Labs	99.97%	11.49 / 10 mg 115% of label	Pass	PTTGA-02
5 Mar 2026	Disguised Alpha	Chromate	99.85%	11.08 / 10 mg 111% of label	—	5159981X
5 Mar 2026	NuScience Peptides	freedomdiagnosticstesting.com	99.95%	11.3 / 10 mg 113% of label	—	00256
3 Mar 2026	Amino USA	freedomdiagnosticstesting.com	99.96%	10.69 / 10 mg 107% of label	—	26PT10-0004
2 Mar 2026	BioCollex Research	freedomdiagnosticstesting.com	99.94%	11.23 / 10 mg 112% of label	—	04920✓
27 Feb 2026	AminoQuest Labs	freedomdiagnosticstesting.com	99.92%	11.1 / 10 mg 111% of label	—	AQ-P41-226-M
25 Feb 2026	Verified Peptides	Janoshik Labs	99.92%	11.02 / 11 mg 100% of label	—	PT03261310J
24 Feb 2026	Peptidology	Vanguard Laboratory	99.04%	10.81 / 10 mg 108% of label	—	1669
22 Feb 2026	Glow Aminos	Ethos Analytics	98.00%	31.94 / 30 mg 106% of label	Pass	GL-010022
22 Feb 2026	Modern Aminos	freedomdiagnosticstesting.com	99.95%	10.93 / 10 mg 109% of label	Pass	BX-P-H5X7
19 Feb 2026	Licensed Peptides	Vanguard Laboratory	99.80%	10.15 / 10 mg 102% of label	Pass	LP02202016
19 Feb 2026	Luxara Labs	Testides	99.00%	10.56 / 10 mg 106% of label	—	View record →
17 Feb 2026	TriVial BioWorks	Chromate	99.43%	10.93 / 10 mg 109% of label	Pass	PT10-0213✓
17 Feb 2026	Peptide Maxxing	Janoshik Labs	99.79%	10.04 / 10 mg 100% of label	—	PTL572✓
16 Feb 2026	Amino Tech	freedomdiagnosticstesting.com	99.94%	8.65 / 10 mg 87% of label	—	View record →
16 Feb 2026	24Peptides	liquilabs	99.00%	11.88 / 10 mg 119% of label	Reported	GF082025028
16 Feb 2026	Grey Market Peptide	freedomdiagnosticstesting.com	99.94%	8.65 / 10 mg 87% of label	—	View record →
16 Feb 2026	Soma ChemsClosed	freedomdiagnosticstesting.com	99.94%	8.65 / 10 mg 87% of label	—	Soma2602130157
12 Feb 2026	Peptide Supply Co	freedomdiagnosticstesting.com	99.46%	8.34 / 10 mg 83% of label	—	PSCCPT410001
12 Feb 2026	Felix Chemical Supply	freedomdiagnosticstesting.com	99.84%	8.91 / 5 mg 178% of labelCheck label	—	020526-PTS-0
11 Feb 2026	Pure Health Peptides	Bioviridian	99.70%	10.11 / 10 mg 101% of label	—	CHA-011926
10 Feb 2026	PeptidePro Canada	Janoshik Labs	99.90%	11.39 / 10 mg 114% of label	—	2511-0-262
10 Feb 2026	BioBoostX	Janoshik Labs	99.91%	11.07 / 10 mg 111% of label	—	EXP: 11/29
9 Feb 2026	Omega Peptides	Janoshik Labs	99.91%	10.73 / 10 mg 107% of label	—	PT10-2601-02
9 Feb 2026	OROS Research	freedomdiagnosticstesting.com	99.92%	10.3 / 10 mg 103% of label	—	1434582
4 Feb 2026	Pure Health Peptides	Bioviridian	99.80%	10.21 / 10 mg 102% of label	—	RPL-011526
27 Jan 2026	BioLongevity Labs	BioRegen	99.64%	7.27 / 5 mg 145% of label	—	25-3-46035
27 Jan 2026	Liberty Peptides	Bioviridian	99.39%	10.52 / 10 mg 105% of label	—	LPUS12002
26 Jan 2026	National Science Labs	freedomdiagnosticstesting.com	99.90%	not reported	—	View record →
26 Jan 2026	Skye Peptides	Janoshik Labs	99.88%	10.21 / 10 mg 102% of label	—	PT26-10-001
24 Jan 2026	Molecular Solutions Peptides	freedomdiagnosticstesting.com	99.92%	10.94 / 10 mg 109% of label	—	R260117-PT1-J001✓
24 Jan 2026	Oath Peptides	freedomdiagnosticstesting.com	99.92%	11.8 / 10 mg 118% of label	—	I6ABF
23 Jan 2026	PeakForm Peptides	freedomdiagnosticstesting.com	99.86%	12.81 / 10 mg 128% of label	—	PF-2026-003
22 Jan 2026	Pure Health Peptides	Ethos Analytics	99.00%	10.49 / 10 mg 105% of label	—	CHA-011526
20 Jan 2026	Penguin Peptides	Janoshik Labs	99.82%	10.35 / 10 mg 103% of label	—	View record →
18 Jan 2026	NUPEPS Peptides	BTLabs	99.90%	10.1 / 10 mg 101% of label	—	CS-pt101105
18 Jan 2026	Pure Health Peptides	Ethos Analytics	99.00%	10.58 / 10 mg 106% of label	—	TUY-010826
16 Jan 2026	BioEdge Research Labs	MDx BioAnalytical Laboratory	99.79%	10.21 / 10 mg 102% of label	—	01122026PT10✓
16 Jan 2026	Blue Sky Peptide	MZ Biolabs	99.41%	not reported	—	1UQ0126
15 Jan 2026	ThreeSide Peptides	Krause Analytical	99.68%	9.71 / 10 mg 97% of label	—	PT102512
15 Jan 2026	Verified Peptides	Janoshik Labs	99.79%	11.61 / 12 mg 97% of label	—	PT01261210I
15 Jan 2026	BioLongevity Labs	MDx BioAnalytical Laboratory	99.77%	5.13 / 5 mg 103% of label	Pass	View record →
12 Jan 2026	True Research Labs	Horizon Analytical	99.13%	9.95 / 10 mg 99% of label	—	TRL-4885039
12 Jan 2026	Amino Forge	Horizon Analytical	99.13%	9.95 / 10 mg 99% of label	—	AF-4885039
12 Jan 2026	Peptide Partners	BioRegen	99.89%	11.02 / 10 mg 110% of label	—	PT202512
12 Jan 2026	Astra Peptides	Horizon Analytical	99.13%	9.95 / 10 mg 99% of label	—	ASTR-34342
12 Jan 2026	Direct Peptides	Horizon Analytical	99.13%	9.95 / 10 mg 99% of label	—	DPS-4885039
9 Jan 2026	Cosmic Peptides	Bioviridian	99.80%	10.14 / 10 mg 101% of label	—	25056
6 Jan 2026	Primal Peptides	Janoshik Labs	99.72%	10.46 / 10 mg 105% of label	—	View record →
3 Jan 2026	Perfect Peptides	Krause Analytical	98.84%	8.85 / 10 mg 89% of label	—	PP9318885
2 Jan 2026	Loti Labs	SR Bio Labs	99.90%	11.48 / 10 mg 115% of label	—	LOT-PT14-00004
30 Dec 2025	EVO Labs Research	Janoshik Labs	99.78%	9.59 / 10 mg 96% of label	—	201125
29 Dec 2025	Research Peptides Europe	liquilabs	99.80%	11.54 / 10 mg 115% of label	Pass	PT-141/2025-12-03
22 Dec 2025	Polaris Peptides	Chromate	99.94%	11.05 / 10 mg 111% of label	—	POL-PT14110-6
22 Dec 2025	Simple Peptide	freedomdiagnosticstesting.com	99.91%	9.91 / 10 mg 99% of label	—	PT141-2210025-H
18 Dec 2025	Certified Peptides	Vanguard Laboratory	99.22%	12.04 / 10 mg 120% of label	Pass	2509PT-10
17 Dec 2025	Molecular Solutions Peptides	freedomdiagnosticstesting.com	99.55%	11.83 / 10 mg 118% of label	—	R250925-PT1-J001✓
16 Dec 2025	LA Peptides	freedomdiagnosticstesting.com	99.81%	9.76 / 10 mg 98% of label	—	318✓
16 Dec 2025	Ion Peptide	Bioviridian	99.80%	9.88 / 10 mg 99% of label	—	PT10-121025
11 Dec 2025	Simple Peptide	freedomdiagnosticstesting.com	99.91%	12.59 / 10 mg 126% of label	—	PT141-1209025-J
9 Dec 2025	Core Peptides	Vanguard Laboratory	99.80%	11.12 / 10 mg 111% of label	—	C73492
8 Dec 2025	Nova Peptide Supply	freedomdiagnosticstesting.com	99.54%	11.36 / 10 mg 114% of label	Pass	NV-P-17VW
8 Dec 2025	Felix Chemical Supply	freedomdiagnosticstesting.com	99.84%	11.08 / 10 mg 111% of label	—	120425-PT-8
4 Dec 2025	HPR	Janoshik Labs	99.80%	9.31 / 10 mg 93% of label	—	PT1119J
4 Dec 2025	NG Peptide	freedomdiagnosticstesting.com	—	10.25 / 10 mg 102% of label	—	P101
4 Dec 2025	NG Peptide	freedomdiagnosticstesting.com	99.51%	10.25 / 10 mg 102% of label	—	PT101
3 Dec 2025	Eternal Peptides	Janoshik Labs	99.47%	9.24 / 10 mg 92% of label	—	EP-250424-PT10
2 Dec 2025	Alpha Carbon Labs	Janoshik Labs	99.74%	9.51 / 10 mg 95% of label	—	View record →
22 Nov 2025	Riptide Wellness	freedomdiagnosticstesting.com	99.80%	11.24 / 10 mg 112% of label	Pass	RWPT-10-1001
20 Nov 2025	Proforma Peptides	Analiza Białek	99.00%	10.67 / 10 mg 107% of label	—	2565
16 Nov 2025	LA Peptides	freedomdiagnosticstesting.com	99.96%	10.77 / 10 mg 108% of label	—	318✓
16 Nov 2025	Ion Peptide	freedomdiagnosticstesting.com	99.86%	11.87 / 10 mg 119% of label	—	PT10-1125
12 Nov 2025	RUO.bio	Janoshik Labs	99.89%	9.25 / 10 mg 93% of label	—	pt4001
10 Nov 2025	Atomik Labz	Janoshik Labs	99.70%	10.05 / 10 mg 101% of label	—	M1024M
9 Nov 2025	Amino Lair	Chromate	99.58%	10.68 / 10 mg 107% of label	—	LAIRF4VS56Z2
5 Nov 2025	HkRoids	freedomdiagnosticstesting.com	99.88%	12.27 / 10 mg 123% of label	—	05672
4 Nov 2025	BioLongevity Labs	BioRegen	99.85%	5.2 / 5 mg 104% of label	—	25-3-45952
3 Nov 2025	Kensington Labs	Janoshik Labs	99.78%	10.68 / 10 mg 107% of label	—	PT1-840MS
1 Nov 2025	Protide Health	freedomdiagnosticstesting.com	99.01%	10.54 / 10 mg 105% of label	—	View record →
30 Oct 2025	BioLongevity Labs	MDx BioAnalytical Laboratory	99.80%	5.11 / 5 mg 102% of label	—	View record →
29 Oct 2025	Nela Peptides	freedomdiagnosticstesting.com	99.97%	10.72 / 10 mg 107% of label	—	2510070013
28 Oct 2025	Glacier Aminos	freedomdiagnosticstesting.com	99.96%	10.68 / 10 mg 107% of label	—	PT10GA01
28 Oct 2025	Luvion Bio Peptides	freedomdiagnosticstesting.com	99.93%	13.04 / 10 mg 130% of label	—	LBL-0625-P41-1052
25 Oct 2025	LA Peptides	freedomdiagnosticstesting.com	99.95%	10.64 / 10 mg 106% of label	—	218✓
23 Oct 2025	Iron Peptides	freedomdiagnosticstesting.com	99.88%	11.08 / 10 mg 111% of label	—	2510230098
23 Oct 2025	Bluum Peptides	BioRegen	99.82%	11.3 / 10 mg 113% of label	—	513212
22 Oct 2025	Pure Health Peptides	BioRegen	99.89%	12.4 / 10 mg 124% of label	—	TUY-101025
22 Oct 2025	Skye Peptides	Janoshik Labs	99.50%	8.64 / 10 mg 86% of label	—	PT25-10-002
21 Oct 2025	Instant Peptides	freedomdiagnosticstesting.com	99.90%	11.73 / 10 mg 117% of label	—	2025-0282-A
18 Oct 2025	BioLongevity Labs	MDx BioAnalytical Laboratory	99.80%	5.06 / 5 mg 101% of label	—	View record →
17 Oct 2025	Synthesis Peptides	freedomdiagnosticstesting.com	99.88%	12.58 / 10 mg 126% of label	—	View record →
17 Oct 2025	BioLongevity Labs	BioRegen	99.93%	6.23 / 5 mg 125% of label	—	25-3-45937
14 Oct 2025	Research Chem HQ	Vanguard Laboratory	99.63%	10.96 / 10 mg 110% of label	Pass	JG56Y
14 Oct 2025	Ion Peptide	freedomdiagnosticstesting.com	99.95%	12.42 / 10 mg 124% of label	—	View record →
10 Oct 2025	RC Peptides	Janoshik Labs	99.62%	10.59 / 10 mg 106% of label	—	003
4 Oct 2025	Mile High Compounds	Chromate	99.91%	10.25 / 10 mg 102% of label	Pass	PT1-010-MH-01
4 Oct 2025	Mile High Compounds	Chromate	99.90%	10.25 / 10 mg 102% of label	Pass	PT1-010-MH-01
3 Oct 2025	Go Alpha Labs	freedomdiagnosticstesting.com	99.86%	12.01 / 10 mg 120% of label	—	LO07-10
1 Oct 2025	Felix Chemical Supply	freedomdiagnosticstesting.com	99.20%	9.4 / 10 mg 94% of label	—	092525-PT-1
29 Sep 2025	Research Chem HQ	Vanguard Laboratory	99.80%	10.7 / 10 mg 107% of label	Pass	E8ISO
26 Sep 2025	Aminos Research	Janoshik Labs	99.66%	11.79 / 10 mg 118% of label	—	PT141-0001
24 Sep 2025	Bulk Peptide Supply	MDx BioAnalytical Laboratory	99.80%	10.16 / 10 mg 102% of label	—	QC251322
23 Sep 2025	Amino USA	BioRegen	99.08%	9.62 / 10 mg 96% of label	—	25PT10-0003
22 Sep 2025	Growth Guys	Janoshik Labs	99.88%	12.05 / 10 mg 121% of label	—	PT02
19 Sep 2025	Peptide Crafters	Janoshik Labs	99.80%	12.41 / 10 mg 124% of label	—	PC-G-PT141
12 Sep 2025	Synthesis PeptidesBlendPT-141/Glycine	freedomdiagnosticstesting.com	99.88%	10.44 / 10 mg 104% of label	—	View record →
12 Sep 2025	Peptira	freedomdiagnosticstesting.com	99.75%	9.01 / 10 mg 90% of label	—	PT10-002
11 Sep 2025	Felix Chemical Supply	Chromate	99.94%	10.71 / 10 mg 107% of label	—	091025-PT1-1
8 Sep 2025	Felix Chemical Supply	Chromate	99.93%	9.88 / 10 mg 99% of label	—	090225-PT10-A
28 Aug 2025	Blank Peptides	freedomdiagnosticstesting.com	99.96%	10.3 / 10 mg 103% of label	—	P14108252025-J
28 Aug 2025	Atomik Labz	Vanguard Laboratory	99.80%	10.16 / 10 mg 102% of label	—	M080525M
27 Aug 2025	Oath Peptides	freedomdiagnosticstesting.com	99.95%	10.37 / 10 mg 104% of label	—	16HBE
25 Aug 2025	XL Peptides	Janoshik Labs	99.94%	11.59 / 10 mg 116% of label	—	901567
15 Aug 2025	Luvion Bio Peptides	freedomdiagnosticstesting.com	99.93%	10.4 / 10 mg 104% of label	—	LBL-0625-P41-1052
15 Aug 2025	Strate Labs	Janoshik Labs	99.94%	11.95 / 10 mg 119% of label	—	View record →
13 Aug 2025	Peptira	Janoshik Labs	99.94%	12.81 / 10 mg 128% of label	—	PT10-001
12 Aug 2025	Bulk Peptide Supply	MDx BioAnalytical Laboratory	99.90%	10.23 / 10 mg 102% of label	—	QC250895
12 Aug 2025	Bulk Peptide Supply	MDx BioAnalytical Laboratory	99.90%	10.14 / 10 mg 101% of label	—	QC250894
12 Aug 2025	Bulk Peptide Supply	MDx BioAnalytical Laboratory	99.90%	9.92 / 10 mg 99% of label	—	QC250883
12 Aug 2025	Bulk Peptide Supply	MDx BioAnalytical Laboratory	99.90%	9.93 / 10 mg 99% of label	—	QC250882
30 Jul 2025	EZ Peps	Janoshik Labs	99.95%	12.84 / 10 mg 128% of label	—	PT100723✓
22 Jul 2025	Soma ChemsClosed	Chromate	99.73%	9.85 / 10 mg 99% of label	—	SOMA18S8L29K
29 Jun 2025	Skye Peptides	Janoshik Labs	99.79%	12.35 / 10 mg 123% of label	—	PT25-10-001
10 Jun 2025	Research Chem HQ	Chromate	99.73%	9.15 / 10 mg 92% of label	—	#002✓
8 Jun 2025	Ignite Peptides	Janoshik Labs	98.88%	10.99 / 10 mg 110% of label	—	PT141-250527-235✓
22 May 2025	Molecular Solutions Peptides	Janoshik Labs	99.73%	12.21 / 10 mg 122% of label	—	R250327-PT1-J001✓
14 May 2025	Cernum Biosciences	Janoshik Labs	99.60%	11.42 / 10 mg 114% of label	—	View record →
8 May 2025	Verified Peptides	Janoshik Labs	99.61%	11.73 / 10 mg 117% of label	—	04-25-0910F
3 Apr 2025	EZ Peps	Janoshik Labs	99.27%	12.64 / 10 mg 126% of label	—	View record →
21 Mar 2025	Peptide Crafters	Janoshik Labs	99.90%	11.27 / 10 mg 113% of label	—	PC-J-PT141
11 Mar 2025	Research Chem HQ	Chromate	98.44%	10.94 / 10 mg 109% of label	—	#001✓
5 Mar 2025	Felix Chemical Supply	Chromate	99.68%	10.95 / 10 mg 110% of label	—	022825-PT10
20 Feb 2025	Biopeptitech	Vanguard Laboratory	99.62%	10.02 / 10 mg 100% of label	—	1001
22 Jan 2025	Growth Guys	Janoshik Labs	99.85%	11.34 / 10 mg 113% of label	—	PT01
14 Jan 2025	Royal Peptides	Janoshik Labs	99.00%	12.2 / 10 mg 122% of label	—	G20250123I0
5 Jan 2025	OROS Research	freedomdiagnosticstesting.com	99.92%	11.59 / 10 mg 116% of label	—	998557
1 Jan 2025	Research Peptides Lab	freedomdiagnosticstesting.com	99.95%	10 / 10 mg 100% of label	—	189691-06-3
1 Jan 2025	Vandl Labs	freedomdiagnosticstesting.com	99.76%	11.42 / 10 mg 114% of label	—	View record →
31 Dec 2024	Atomik Labz	Janoshik Labs	99.66%	11.95 / 10 mg 119% of label	—	MM1223
11 Nov 2024	Polaris Peptides	Janoshik Labs	99.82%	11.67 / 10 mg 117% of label	—	POL-PT14110-4
4 Nov 2024	Skye Peptides	Janoshik Labs	99.94%	12.07 / 10 mg 121% of label	—	PT24-10-005
21 Oct 2024	Beyond Peptides	Janoshik Labs	99.61%	11.52 / 10 mg 115% of label	—	#002
16 Oct 2024	Priority Peptides	Janoshik Labs	99.86%	10.23 / 10 mg 102% of label	—	PT1-100-A1
4 Oct 2024	Optima Supply	Janoshik Labs	99.93%	10.46 / 10 mg 105% of label	—	PT141-001
4 Oct 2024	Hydro Research Peptides	Janoshik Labs	99.91%	10.46 / 10 mg 105% of label	—	PT141-003
3 Oct 2024	Kimera Chems	Vanguard Laboratory	99.81%	10.1 / 10 mg 101% of label	—	View record →
27 Sep 2024	Peptidic	Janoshik Labs	99.95%	11.33 / 10 mg 113% of label	—	042025
6 Sep 2024	Verified Peptides	Janoshik Labs	99.92%	11.94 / 10 mg 119% of label	—	07-24-0710G
17 Aug 2024	Research Chem HQ	Chromate	99.75%	9.87 / 10 mg 99% of label	—	View record →
11 Jul 2024	Research Ready Peptides	Vanguard Laboratory	99.63%	10 / 10 mg 100% of label	—	PT-141-LYNP41-10-2
28 Jun 2024	Skye Peptides	Janoshik Labs	99.90%	11.56 / 10 mg 116% of label	—	PT24-24-004
25 Jun 2024	Biolabshop	Analiza Białek	97.00%	9.89 / 10 mg 99% of label	—	100005300
14 Jun 2024	Polaris Peptides	Janoshik Labs	99.89%	14.75 / 10 mg 148% of label	—	POL-PT14110-1
30 May 2024	Verified Peptides	Janoshik Labs	99.97%	11.18 / 10 mg 112% of label	—	05-24-0510E
22 May 2024	Peptide Crafters	Janoshik Labs	99.90%	12.46 / 10 mg 125% of label	—	PC-Z-PT141
17 Nov 2023	Verified Peptides	Janoshik Labs	99.93%	10.05 / 10 mg 101% of label	—	10423C
7 Nov 2023	Skye Peptides	Janoshik Labs	99.98%	10.11 / 10 mg 101% of label	—	1896-10-001
13 Nov 2022	Verified Peptides	Janoshik Labs	99.89%	11.11 / 10 mg 111% of label	—	07564B
1 Mar 2021	Verified Peptides	Janoshik Labs	99.75%	9.29 / 10 mg 93% of label	—	16834A

Measured amount in amber when it is under 90% or over 130% of the label; Check label when it is under 80% or over 150%. Records without a lot number link as View →. Blend and other-form rows keep their place and page; they are tagged and left out of the figures above, because a blend certificate reports one purity and one amount for the whole vial.

Seven checks for any PT-141 certificate

The same seven questions decide whether a certificate of analysis means anything, whichever compound it describes. Six are about the document; the seventh is about what no document can tell you.

An independent, batch-matched COA. The certificate must name the batch or lot in your hands, and must come from a laboratory the vendor neither owns nor pays. A specimen certificate from an earlier lot proves nothing about the vial you were sent.
HPLC purity, read against a known band. A purity figure is only informative against the distribution for that compound. "Above 98%" is not a claim — the useful question is whether the result sits inside the range the rest of the market reports. How to read HPLC and mass-spec results.
Mass-spectrometry identity. HPLC says how much of the sample is one thing; it does not say which thing. Only a mass-spec result establishes identity, and it is the only check that separates compounds a few daltons apart. Contamination is not hypothetical: research-grade custom peptides from two independent commercial suppliers were found to carry contaminating peptides at roughly 1% by weight, enough to produce false-positive results in immunology assays (Clinical and Vaccine Immunology, 2008 — a study of HIV vaccine peptide libraries rather than of any compound on this site).
Net content, measured rather than assumed. Purity and quantity are different questions: a vial can be 99.7% pure and still contain two thirds of the labelled mass. Why 10 mg isn't 10 mg.
Endotoxin (LAL) on the batch. An absent endotoxin line means the batch was not tested — not that it passed. Endotoxin testing and LAL interpretation.
Who ran the test, and what they left off. A laboratory with a record on this compound, named on the certificate, with a verification route back to it. Testing laboratories we track · Red flags in a certificate of analysis.
What no test on the vial can establish. A perfect certificate confirms that a vendor sold the correct molecule at the stated quantity. It says nothing about efficacy, dosing, or long-term safety.

Want a vial tested yourself? How to send a peptide for independent HPLC testing.