Melanotan II (MT-2) lab tests

279 certificates of analysis for Melanotan II (MT-2) are on file — 278 for single vials and 1 for blends and other forms — from 189 shops and 21 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

279

278 single vials · 1 blends & other forms

Median purity

99.76%

usual 99.15–99.93% · shop COAs

Measured vs label

106%

median · 17 under 90% · 45 over 120%

Latest test

21 Sep 2026

21 labs · 189 shops

Look up your vial's lot →Melanotan II (MT-2) prices →Get a vial tested

What Melanotan II (MT-2) results look like

single vials only · 278 purity results · 274 measured-content results

Purity is tightly bunched: the middle 80% of results sit within 0.8 points. Measured content spreads across 30 points of the label.

HPLC purity

99.15–99.93%middle 80% of results

median 99.76%96% at 99% or higher1 under 98%

% HPLC purity

Measured content vs label

95–125%middle 80% of results

median 106%17 under 90%45 over 120%

% of the labelled amount

outside the usual rangeEndotoxin reported on 52 of 278 (19%)Confirmed on the lab's own portal: 68 (24%)Most tested size: 10 mg (267)

Latest Melanotan II (MT-2) tests

10 most recent · all formsAll 279 ↓

Latest Melanotan II (MT-2) lab tests
Tested	Shop	Lab	Purity	Measured vs label	Endotoxin	Record
21 Sep 2026	Rogue Compounds	ILS Laboratories	99.88%	10.55 / 10 mg 106% of label	—	MT2-260808-001✓
4 Sep 2026	Luv Aminos	freedomdiagnosticstesting.com	99.76%	13.92 / 10 mg 139% of label	—	MTII-10-001✓
1 Sep 2026	10 Bottle Value	—	99.21%	10.01 / 10 mg 100% of label	—	jrkd5w3
28 Aug 2026	Vistara Labs	—	99.81%	10.09 / 10 mg 101% of label	Pass	00011/0011
26 Aug 2026	Regenorix Peptides	liquilabs	99.80%	14.72 / 10 mg 147% of label	Reported	RGXMT210-YYMM-01
12 Aug 2026	Blank Peptides	Horizon Analytical	99.20%	10.17 / 10 mg 102% of label	—	DPS-1598203
6 Aug 2026	Humatide Peptides	ILS Laboratories	99.89%	10.41 / 10 mg 104% of label	—	H10MLTN2073126
3 Aug 2026	BioEdge Research Labs	Kovera Labs	99.86%	10.31 / 10 mg 103% of label	Pass	04012026MEL210✓
28 Jul 2026	Zen Aminos	freedomdiagnosticstesting.com	99.96%	10.25 / 10 mg 102% of label	—	ZAP-MT2-3✓
27 Jul 2026	PeptuviaSupplier-provided	Janoshik Labs	99.85%	11.66 / 10 mg 117% of label	—	PSMT210-1✓

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 Melanotan II (MT-2) tests

Melanotan II (MT-2) single-vial results by testing lab
Lab	Tests	Median purity	Median measured vs label	Endotoxin reported	Confirmed on lab portal
freedomdiagnosticstesting.com	98	99.82%	107%	18	28
Janoshik Labs	69	99.74%	108%	0	13
Vanguard Laboratory	18	99.31%	103%	4	0
Kovera Labs	16	99.86%	113%	10	10
Chromate	13	99.36%	107%	3	4
ILS Laboratories	12	99.75%	104%	4	10
Horizon Analytical	7	99.21%	101%	0	0
liquilabs	6	99.80%	110%	5	0

Differences reflect the vials each lab received and how it reports — this is not a ranking of labs. Every lab with a Melanotan II (MT-2) test on file is linked under More on Melanotan II (MT-2).

What melanotan II testing has to rule out — and what it cannot

Melanotan II is a cyclic heptapeptide analogue of α-MSH, Ac-Nle⁴-c[Asp⁵-His⁶-D-Phe⁷-Arg⁸-Trp⁹-Lys¹⁰]-NH₂, CAS 121062-08-6 (PubChem CID 92432), C₅₀H₆₉N₁₅O₉, 1,024.18 g/mol. Its nearest look-alike is PT-141 (bremelanotide), C₅₀H₆₈N₁₄O₁₀ at 1,025.2. The two share an identical backbone and lactam bridge and differ only at the C-terminus — a lysine amide (–NH₂) in melanotan II against a lysine acid (–OH) in bremelanotide — about 1 Da on 1,024. HPLC co-elutes them and nominal-mass MS cannot reliably separate them; high-resolution mass spectrometry or MS/MS fragmentation on the batch can.

Two published analytical studies exist on exactly this discrimination: 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. The direction of the substitution risk is unusual: receiving bremelanotide instead is not the substitution that harms a melanotan II buyer.

On this compound an identity result settles less than usual. The published harms came from correctly identified material — mass spectrometry confirmed the injected substance was melanotan II in a published rhabdomyolysis case — so a certificate that passes every check confirms the vial holds the compound described in the case literature, not that it is safe. A high purity figure is not a safety finding.

High-resolution MS or MS/MS at 1,024.18 Da, batch-matched, with the instrument type stated. Nominal-mass MS, or HPLC alone, cannot tell melanotan II from bremelanotide at 1,025.2.
Fill accuracy as its own check: quantity variance in this platform's melanotan II data ran −7.3% to +16% (verified August 2026). Quantitative content testing is the check.
Endotoxin (LAL) results are mostly absent on melanotan II. FDA's evaluation language flags immunogenicity risk "due to the potential for aggregation or peptide-related impurities."

All Melanotan II (MT-2) tests

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

280 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	99.88%	10.55 / 10 mg 106% of label	—	MT2-260808-001✓
4 Sep 2026	Luv Aminos	freedomdiagnosticstesting.com	99.76%	13.92 / 10 mg 139% of label	—	MTII-10-001✓
1 Sep 2026	10 Bottle Value	—	99.21%	10.01 / 10 mg 100% of label	—	jrkd5w3
28 Aug 2026	Vistara Labs	—	99.81%	10.09 / 10 mg 101% of label	Pass	00011/0011
26 Aug 2026	Regenorix Peptides	liquilabs	99.80%	14.72 / 10 mg 147% of label	Reported	RGXMT210-YYMM-01
12 Aug 2026	Blank Peptides	Horizon Analytical	99.20%	10.17 / 10 mg 102% of label	—	DPS-1598203
6 Aug 2026	Humatide Peptides	ILS Laboratories	99.89%	10.41 / 10 mg 104% of label	—	H10MLTN2073126
3 Aug 2026	BioEdge Research Labs	Kovera Labs	99.86%	10.31 / 10 mg 103% of label	Pass	04012026MEL210✓
28 Jul 2026	Zen Aminos	freedomdiagnosticstesting.com	99.96%	10.25 / 10 mg 102% of label	—	ZAP-MT2-3✓
27 Jul 2026	PeptuviaSupplier-provided	Janoshik Labs	99.85%	11.66 / 10 mg 117% of label	—	PSMT210-1✓
26 Jul 2026	Elevated Peptides	MZ Biolabs	99.78%	not reported	—	2026-07-08
24 Jul 2026	Peptide Plugs	freedomdiagnosticstesting.com	99.71%	10.48 / 10 mg 105% of label	Pass	160-710L-DK✓
21 Jul 2026	Nova Labs	freedomdiagnosticstesting.com	99.89%	9.36 / 10 mg 94% of label	Pass	View record →
21 Jul 2026	Peptime	freedomdiagnosticstesting.com	99.86%	10.8 / 10 mg 108% of label	—	76MT✓
19 Jul 2026	Peptide Foundry	ILS Laboratories	99.76%	10.45 / 10 mg 105% of label	Pass	FO776✓
12 Jul 2026	TriVial BioWorks	Kovera Labs	99.74%	10.29 / 10 mg 103% of label	Pass	MT2-0706✓
11 Jul 2026	Honest Peptide	freedomdiagnosticstesting.com	99.74%	9.46 / 10 mg 95% of label	—	ML1005152026✓
9 Jul 2026	Ascend Science	Kovera Labs	99.54%	10.28 / 10 mg 103% of label	—	C5018RI1509✓
30 Jun 2026	Glow Aminos	ILS Laboratories	99.95%	10.47 / 10 mg 105% of label	—	GL-010179✓
28 Jun 2026	Studz Peptides	ILS Laboratories	99.30%	10.28 / 10 mg 103% of label	—	M210609LIS✓
27 Jun 2026	My Amino Lab	Kovera Labs	99.61%	11.45 / 10 mg 115% of label	—	V2606-MT2-2401✓
26 Jun 2026	Pepme	liquilabs	99.70%	9.71 / 10 mg 97% of label	—	View record →
22 Jun 2026	Veratis Bio Peptides	freedomdiagnosticstesting.com	99.85%	11.05 / 10 mg 111% of label	—	MT2260618A✓
22 Jun 2026	Ameano Peptides	Janoshik Labs	99.94%	11.26 / 10 mg 113% of label	—	MEL2100607 2026-07✓
19 Jun 2026	Ktechpeptide	Janoshik Labs	99.88%	12.33 / 10 mg 123% of label	—	2026-6✓
18 Jun 2026	Optimum Formula	ILS Laboratories	99.58%	10.33 / 10 mg 103% of label	Pass	#HXV3H✓
18 Jun 2026	Kalyx Labs	freedomdiagnosticstesting.com	99.92%	11.6 / 10 mg 116% of label	—	ML10-B02✓
18 Jun 2026	Research Chem HQ	ILS Laboratories	99.58%	10.33 / 10 mg 103% of label	Pass	#HXY3H✓
16 Jun 2026	Swiss Chems	Janoshik Labs	99.69%	10.11 / 10 mg 101% of label	—	Test-ED4✓
15 Jun 2026	Oasis Labs	Bioviridian	99.90%	10.48 / 10 mg 105% of label	—	112455✓
15 Jun 2026	Ascension Peptides	Kovera Labs	99.58%	9.27 / 10 mg 93% of label	Pass	23-05260628✓
15 Jun 2026	LA Peptides	Bioviridian	99.90%	10.43 / 10 mg 104% of label	Pass	1318
13 Jun 2026	National Science Labs	freedomdiagnosticstesting.com	99.91%	11.02 / 10 mg 110% of label	—	C50H69N15O9
12 Jun 2026	Maple Research Labs	Testides	99.52%	10.52 / 10 mg 105% of label	—	5766✓
12 Jun 2026	Bluum Peptides	freedomdiagnosticstesting.com	99.70%	10.71 / 10 mg 107% of label	Pass	MT2102606-91G
11 Jun 2026	24Peptides	liquilabs	99.80%	12.56 / 10 mg 126% of label	Reported	GF-MELII10-B241
10 Jun 2026	Aigil Research	ILS Laboratories	99.16%	10.22 / 10 mg 102% of label	—	AG-MT2✓
7 Jun 2026	Ramp Peptides	freedomdiagnosticstesting.com	99.84%	10.31 / 10 mg 103% of label	—	MT210-RP01✓
5 Jun 2026	Honest Peptide	freedomdiagnosticstesting.com	99.96%	12.62 / 10 mg 126% of label	—	ML1006012026✓
5 Jun 2026	Voltera Sciences Peptides	ILS Laboratories	98.70%	10.55 / 10 mg 106% of label	—	ML20.05.28.26✓
2 Jun 2026	Revitalized Research	Horizon Analytical	99.21%	9.93 / 10 mg 99% of label	—	RRL-3295184-P
2 Jun 2026	Proxiva Peptides	Vanguard Laboratory	98.70%	10.2 / 10 mg 102% of label	—	109
1 Jun 2026	Panda Peptides	Janoshik Labs	99.78%	9.83 / 10 mg 98% of label	—	PP2602-007A
1 Jun 2026	Chameleon PeptidesClosed	Janoshik Labs	99.78%	9.83 / 10 mg 98% of label	—	B002
30 May 2026	Warrior Makers	Testides	99.41%	11.3 / 10 mg 113% of label	Pass	11258-SG5
29 May 2026	EVO Labs Research	Kovera Labs	99.55%	11.39 / 10 mg 114% of label	—	EVO5213026
28 May 2026	GenPeptide	Chromate	99.14%	10.93 / 10 mg 109% of label	—	GPMII10052526✓
28 May 2026	CertaPeptides	Janoshik Labs	99.72%	10.01 / 10 mg 100% of label	—	CP-2604-MT210✓
27 May 2026	Puratek Peptides	ILS Laboratories	99.93%	10.65 / 10 mg 107% of label	—	mt210003✓
27 May 2026	Good Science	Vanguard Laboratory	99.03%	11.08 / 10 mg 111% of label	Pass	3548231
24 May 2026	Elutide	Horizon Analytical	99.21%	9.93 / 10 mg 99% of label	—	E-4198724-P
21 May 2026	Drakon Peptides	Janoshik Labs	99.89%	10.4 / 10 mg 104% of label	—	DRK-MT2-MAY26✓
21 May 2026	Signum Scientific	Horizon Analytical	99.21%	9.93 / 10 mg 99% of label	—	SS-4198724-P
21 May 2026	Everest Peptides	freedomdiagnosticstesting.com	99.92%	9.71 / 10 mg 97% of label	—	EVR-MT210-2605-001
20 May 2026	Zen Aminos	freedomdiagnosticstesting.com	99.94%	10.89 / 10 mg 109% of label	—	ZAP-MT2-2
19 May 2026	Nova BioLabs Peptides	Uzorak	99.91%	12.08 / 10 mg 121% of label	—	ZQ0-P8V✓
19 May 2026	Proforma Peptides	Analiza Białek	99.00%	10.8 / 10 mg 108% of label	—	2565
17 May 2026	Instant Peptides	Kovera Labs	99.91%	9.24 / 10 mg 92% of label	—	2026-0242-A
16 May 2026	Kalyx Labs	freedomdiagnosticstesting.com	99.89%	9.64 / 10 mg 96% of label	—	ML10-B01✓
15 May 2026	EZ Peptides	Janoshik Labs	99.78%	11.22 / 10 mg 112% of label	—	EZP-MEL21005032026-06✓
12 May 2026	Modern Research Peptides	freedomdiagnosticstesting.com	99.83%	10.08 / 10 mg 101% of label	—	BCEN28597✓
11 May 2026	Warrior Makers	MZ Biolabs	99.63%	not reported	—	11258-SG5
8 May 2026	Idun Peptides	freedomdiagnosticstesting.com	99.93%	10.64 / 10 mg 106% of label	—	MT21-260411✓
8 May 2026	Synthesis Peptides	freedomdiagnosticstesting.com	99.59%	10.57 / 10 mg 106% of label	—	View record →
8 May 2026	Amino Forge	Horizon Analytical	99.15%	10.1 / 10 mg 101% of label	—	A(ITUBALL-7423117-P
7 May 2026	Zen Aminos	freedomdiagnosticstesting.com	99.90%	11.62 / 20 mg 58% of labelCheck label	—	ZAP-MT2-1
5 May 2026	Glow Aminos	ILS Laboratories	99.84%	10.38 / 10 mg 104% of label	—	GL-010088✓
3 May 2026	Real Peptides	freedomdiagnosticstesting.com	99.94%	10.22 / 10 mg 102% of label	—	View record →
3 May 2026	Protide Health	freedomdiagnosticstesting.com	99.95%	11.81 / 10 mg 118% of label	Pass	PH-MN210-0327
29 Apr 2026	Neopeps	Janoshik Labs	99.95%	10.11 / 10 mg 101% of label	—	View record →
29 Apr 2026	New Wave Peptides	Janoshik Labs	99.83%	10.14 / 10 mg 101% of label	—	19900
27 Apr 2026	BioLongevity Labs	MDx BioAnalytical Laboratory	99.78%	10.19 / 10 mg 102% of label	Pass	17-3-46136
25 Apr 2026	Studz Peptides	Kovera Labs	99.88%	10.76 / 10 mg 108% of label	—	MT2-04192026-LIS✓
24 Apr 2026	Verified Peptides	Janoshik Labs	99.91%	11.96 / 12 mg 100% of label	—	04260410D
23 Apr 2026	Xeno Peptides	BTLabs	99.90%	11.2 / 10 mg 112% of label	—	MT01-01
23 Apr 2026	Precisely Peptides	Vanguard Laboratory	99.39%	11 / 10 mg 110% of label	—	PP412-26-001
22 Apr 2026	TriVial BioWorks	Kovera Labs	99.85%	11.69 / 10 mg 117% of label	Pass	MT210-0413✓
22 Apr 2026	Riptide Wellness	ILS Laboratories	99.74%	10.47 / 10 mg 105% of label	Reported	RWMT2-10-1003
22 Apr 2026	RUO.bio	Chromate	99.14%	10.74 / 10 mg 107% of label	Pass	MT202
22 Apr 2026	Arcane Peptides	Chromate	99.14%	10.74 / 10 mg 107% of label	Pass	MT202
22 Apr 2026	Peptide Plugs	freedomdiagnosticstesting.com	99.73%	9.68 / 10 mg 97% of label	—	120-A-5
21 Apr 2026	Puratek Peptides	freedomdiagnosticstesting.com	99.86%	10.52 / 10 mg 105% of label	Pass	MT210002✓
21 Apr 2026	Vylix Research	freedomdiagnosticstesting.com	99.77%	12.42 / 10 mg 124% of label	—	ML10-250416-01
21 Apr 2026	Vylix Research	freedomdiagnosticstesting.com	99.87%	9.37 / 10 mg 94% of label	—	ML10-250416-01
20 Apr 2026	Modified Aminos	Vanguard Laboratory	99.80%	10.33 / 10 mg 103% of label	—	MA-MTP2-101
19 Apr 2026	BulkGLP	freedomdiagnosticstesting.com	99.78%	11.62 / 10 mg 116% of label	—	4389
15 Apr 2026	Enhanced Peptides	Vanguard Laboratory	99.62%	10.32 / 10 mg 103% of label	—	FP26-4082
13 Apr 2026	Double R Labs	Kovera Labs	99.90%	11.83 / 10 mg 118% of label	Pass	DRL-04-MT210✓
13 Apr 2026	LA Peptides	Bioviridian	99.90%	10.71 / 10 mg 107% of label	Pass	BATCH 1018
11 Apr 2026	PeptideRUO	freedomdiagnosticstesting.com	99.65%	11.58 / 10 mg 116% of label	—	MT100406✓
9 Apr 2026	Nura Peptide	freedomdiagnosticstesting.com	99.49%	10.12 / 10 mg 101% of label	—	MEL2-04926✓
9 Apr 2026	Glacier Aminos	Kovera Labs	99.92%	11 / 10 mg 110% of label	Pass	MT2GA-03
8 Apr 2026	Omegamino	freedomdiagnosticstesting.com	99.44%	10.18 / 10 mg 102% of label	—	1001
7 Apr 2026	Vera	freedomdiagnosticstesting.com	99.79%	11.42 / 10 mg 114% of label	—	MT10-260324A
7 Apr 2026	Blank Peptides	freedomdiagnosticstesting.com	99.76%	9.69 / 10 mg 97% of label	—	665394
7 Apr 2026	Amino USA	freedomdiagnosticstesting.com	99.90%	11.48 / 10 mg 115% of label	—	26MT10-0006
5 Apr 2026	EZ Peps	freedomdiagnosticstesting.com	99.93%	9.16 / 10 mg 92% of label	Pass	26-M2-YST / YS100226✓
5 Apr 2026	Rivn Peptides	freedomdiagnosticstesting.com	99.68%	9.3 / 10 mg 93% of label	—	9117
3 Apr 2026	Disguised Alpha	Chromate	99.15%	11.51 / 10 mg 115% of label	—	U3X35
2 Apr 2026	Crush Research	BTLabs	99.80%	9.8 / 10 mg 98% of label	—	CR-MT210-2603-1
30 Mar 2026	Alpha Peptides	Analytical Formulations Inc	99.90%	10.71 / 10 mg 107% of label	—	MT-31126328
29 Mar 2026	Kimera Chems	freedomdiagnosticstesting.com	99.79%	9.81 / 10 mg 98% of label	—	KC-MT2-YEL2
28 Mar 2026	Real Peptides	freedomdiagnosticstesting.com	99.82%	8.99 / 10 mg 90% of label	Pass	View record →
28 Mar 2026	Elite Research USA	BioRegen	99.52%	10.74 / 10 mg 107% of label	—	3436SY0326
27 Mar 2026	Oneday Compounds	Vanguard Laboratory	99.23%	10.84 / 10 mg 108% of label	—	OC-MT210-101
26 Mar 2026	Valor Peptides	Accumark Labs	99.82%	12.52 / 10 mg 125% of label	—	MT2001
26 Mar 2026	Vylix Research	freedomdiagnosticstesting.com	99.85%	10.54 / 10 mg 105% of label	—	View record →
26 Mar 2026	Peptide Supply Co	freedomdiagnosticstesting.com	99.64%	10.04 / 10 mg 100% of label	Pass	MT2100323026
23 Mar 2026	Silverstone Labs Co	freedomdiagnosticstesting.com	99.69%	11.19 / 10 mg 112% of label	—	MT2-0326✓
22 Mar 2026	Optimum Formula	Kovera Labs	99.92%	11.83 / 10 mg 118% of label	Pass	X7Y5K✓
20 Mar 2026	Oath Peptides	freedomdiagnosticstesting.com	99.93%	5.86 / 5 mg 117% of label	—	B0526
20 Mar 2026	Peptide Crafters	Janoshik Labs	99.75%	11.09 / 10 mg 111% of label	—	PC-G3-MT2
18 Mar 2026	KOLD Peptides	Accumark Labs	99.08%	8.9 / 10 mg 89% of label	—	1128
18 Mar 2026	Mile High Compounds	Kovera Labs	99.99%	11.9 / 10 mg 119% of label	Pass	MLN-010-MH-01
18 Mar 2026	Orbitrex Peptides	freedomdiagnosticstesting.com	99.85%	13.01 / 10 mg 130% of label	Pass	MT2100426
17 Mar 2026	PurgoLabs Peptides	freedomdiagnosticstesting.com	99.93%	10.18 / 10 mg 102% of label	—	PS03-MT02-Y✓
17 Mar 2026	Petratide Science	freedomdiagnosticstesting.com	99.93%	10.18 / 10 mg 102% of label	—	PS03-MT02-Y
17 Mar 2026	Oath Peptides	freedomdiagnosticstesting.com	99.86%	10.35 / 10 mg 103% of label	—	B0526
16 Mar 2026	Omega Peptides	Janoshik Labs	99.74%	11.61 / 10 mg 116% of label	—	MT10-2603
16 Mar 2026	Ion Peptide	Analytical Formulations Inc	99.75%	10.78 / 10 mg 108% of label	—	MLT210-0312026
14 Mar 2026	Synthesis Peptides	freedomdiagnosticstesting.com	99.83%	12.76 / 10 mg 128% of label	—	View record →
13 Mar 2026	Modern Research Peptides	freedomdiagnosticstesting.com	99.96%	11.95 / 10 mg 119% of label	—	MKMTI70902✓
13 Mar 2026	Stratford Peptides	Analiza Białek	99.11%	11.48 / 10 mg 115% of label	—	100013170
12 Mar 2026	Vandl Labs	Vanguard Laboratory	99.10%	11.03 / 10 mg 110% of label	—	View record →
10 Mar 2026	Offline Peptides	freedomdiagnosticstesting.com	99.80%	12.21 / 10 mg 122% of label	—	OP-ML10-0326✓
10 Mar 2026	Enhanced Peptides	Vanguard Laboratory	99.78%	10.21 / 10 mg 102% of label	—	MT-26B-05
10 Mar 2026	Vi Corpus	Janoshik Labs	99.47%	12.12 / 10 mg 121% of label	—	VCAU26.1
9 Mar 2026	Growth Guys	Janoshik Labs	99.76%	8.93 / 10 mg 89% of label	—	MT203
9 Mar 2026	Mile High Compounds	Kovera Labs	99.97%	11.2 / 10 mg 112% of label	—	MLT-010-MH-01
6 Mar 2026	GenPeptide	freedomdiagnosticstesting.com	99.69%	12.58 / 10 mg 126% of label	—	GPMII10030526✓
6 Mar 2026	Chameleon PeptidesClosed	Janoshik Labs	99.87%	10.54 / 10 mg 105% of label	—	View record →
5 Mar 2026	Nova Peptide Supply	freedomdiagnosticstesting.com	99.93%	12.97 / 10 mg 130% of label	Pass	NV-P-6VUA
5 Mar 2026	Ion Peptide	Analytical Formulations Inc	99.60%	11.41 / 10 mg 114% of label	—	MLT210-02232026
5 Mar 2026	Atomik Labz	BioRegen	99.77%	10.14 / 10 mg 101% of label	Pass	M22726
4 Mar 2026	Purity Peptides	MDx BioAnalytical Laboratory	99.79%	10.18 / 10 mg 102% of label	Pass	View record →
3 Mar 2026	Peptide Koning	Axiom Analytics	99.94%	10.18 / 10 mg 102% of label	Pass	PK-RG-009
2 Mar 2026	Protide Health	freedomdiagnosticstesting.com	99.89%	12.1 / 10 mg 121% of label	—	PH-MN210596
28 Feb 2026	Ion Peptide	Analytical Formulations Inc	99.70%	12.46 / 10 mg 125% of label	—	MLT210-02242026
28 Feb 2026	OROS Research	freedomdiagnosticstesting.com	99.80%	9.88 / 20 mg 49% of labelCheck label	Pass	1621439
27 Feb 2026	Oath Peptides	freedomdiagnosticstesting.com	99.82%	4.62 / 5 mg 92% of label	—	B0526
26 Feb 2026	Glowing Peptides	Janoshik Labs	99.94%	10.85 / 10 mg 109% of label	—	C117
25 Feb 2026	Research Chem HQ	Kovera Labs	99.76%	11.46 / 10 mg 115% of label	Pass	#X7Y5K✓
25 Feb 2026	Nexaph	Janoshik Labs	99.89%	10.23 / 10 mg 102% of label	—	MEL21002152026-05
21 Feb 2026	Prosperity Peptides	freedomdiagnosticstesting.com	99.98%	11.78 / 10 mg 118% of label	—	MT10-001
20 Feb 2026	Next Gen Compounds	Janoshik Labs	99.77%	10.35 / 10 mg 103% of label	—	MT2-10-001-0102
19 Feb 2026	Pure U.S. Peptides	Vanguard Laboratory	99.80%	10.37 / 10 mg 104% of label	Pass	M26C731
18 Feb 2026	Petratide Science	freedomdiagnosticstesting.com	99.87%	11.01 / 10 mg 110% of label	—	PS02-MT01-B
18 Feb 2026	XL Peptides	Janoshik Labs	98.13%	10.74 / 10 mg 107% of label	—	302MT2
18 Feb 2026	Ion Peptide	Analytical Formulations Inc	99.50%	10.55 / 10 mg 106% of label	—	MLT2-02122026
18 Feb 2026	Direct Peptides	Horizon Analytical	99.14%	10.3 / 10 mg 103% of label	—	DPS-1573119
17 Feb 2026	Peptide Maxxing	Janoshik Labs	98.11%	9.62 / 10 mg 96% of label	—	MEL249✓
16 Feb 2026	Amino Tech	freedomdiagnosticstesting.com	99.81%	10.57 / 10 mg 106% of label	—	View record →
16 Feb 2026	Grey Market Peptide	freedomdiagnosticstesting.com	99.81%	10.57 / 10 mg 106% of label	—	View record →
16 Feb 2026	Soma ChemsClosed	freedomdiagnosticstesting.com	99.81%	10.57 / 10 mg 106% of label	—	Soma2602130247
12 Feb 2026	Gentleman Peptides	Bioviridian	99.80%	9.88 / 10 mg 99% of label	—	View record →
10 Feb 2026	Imperial Peptides UK	Janoshik Labs	99.75%	10.69 / 10 mg 107% of label	—	MT10-12/27✓
10 Feb 2026	BioBoostX	Janoshik Labs	99.77%	9.89 / 10 mg 99% of label	—	EXP: 11/29
9 Feb 2026	Restore Peptides	Chromate	98.84%	10.44 / 10 mg 104% of label	—	RP-2511-160✓
7 Feb 2026	Midwest Peptide	freedomdiagnosticstesting.com	99.13%	9.95 / 10 mg 99% of label	—	MPMIT001
6 Feb 2026	Glacier Aminos	Kovera Labs	99.65%	12.31 / 10 mg 123% of label	Pass	MT2GA-02
5 Feb 2026	Peak Peptides	Janoshik Labs	99.51%	12.32 / 10 mg 123% of label	—	MT210-0127
3 Feb 2026	PurgoLabs Peptides	freedomdiagnosticstesting.com	99.39%	not reported	—	PL001✓
3 Feb 2026	Loti Labs	SR Bio Labs	99.52%	10.83 / 10 mg 108% of label	—	LOT-MT2-00002
30 Jan 2026	Instant Peptides	freedomdiagnosticstesting.com	99.48%	11.36 / 10 mg 114% of label	Pass	2026-0274-A
28 Jan 2026	Ascension Peptides	MZ Biolabs	99.56%	10.94 / 10 mg 109% of label	—	23-01260229
27 Jan 2026	Liberty Peptides	Horizon Analytical	99.26%	11.21 / 10 mg 112% of label	—	LPUS25002
26 Jan 2026	Nova Peptide Supply	freedomdiagnosticstesting.com	99.45%	11.31 / 10 mg 113% of label	Pass	View record →
26 Jan 2026	Amino Lair	freedomdiagnosticstesting.com	99.11%	10.54 / 10 mg 105% of label	—	2601230134
24 Jan 2026	NeuroLabs	freedomdiagnosticstesting.com	99.61%	12.44 / 10 mg 124% of label	—	2601220039
23 Jan 2026	PeakForm Peptides	freedomdiagnosticstesting.com	99.82%	12.3 / 10 mg 123% of label	—	PF-2026-002
22 Jan 2026	ThreeSide Peptides	Krause Analytical	99.40%	9.54 / 10 mg 95% of label	—	MT2102512
20 Jan 2026	Penguin Peptides	Janoshik Labs	99.50%	10.92 / 10 mg 109% of label	—	View record →
20 Jan 2026	Nova Peptide Supply	freedomdiagnosticstesting.com	99.52%	13.29 / 10 mg 133% of label	Pass	NV-P-27RJ
17 Jan 2026	Peptide Supply Co	freedomdiagnosticstesting.com	99.48%	12.46 / 10 mg 125% of label	—	View record →
16 Jan 2026	Blue Sky Peptide	MZ Biolabs	99.94%	not reported	—	1UQMT0126
16 Jan 2026	Ion Peptide	freedomdiagnosticstesting.com	99.83%	10.94 / 20 mg 55% of labelCheck label	—	MLT210-0132028
15 Jan 2026	EZ Peps	freedomdiagnosticstesting.com	99.82%	11.76 / 12 mg 98% of label	—	25-U12-CBT/MT2101217✓
13 Jan 2026	Evolve Biopep	Vanguard Laboratory	99.02%	9.13 / 10 mg 91% of label	—	M210126
13 Jan 2026	Peptira	freedomdiagnosticstesting.com	99.84%	12.9 / 10 mg 129% of label	Pass	MT2-10-004
8 Jan 2026	Injectify	Janoshik Labs	99.87%	10.54 / 10 mg 105% of label	—	PE2401-662
6 Jan 2026	Molecular Solutions Peptides	Janoshik Labs	99.83%	10.46 / 10 mg 105% of label	—	R251218-MT2-R001✓
6 Jan 2026	Primal Peptides	Janoshik Labs	99.38%	10.36 / 10 mg 104% of label	—	View record →
3 Jan 2026	Glow Aminos	freedomdiagnosticstesting.com	99.85%	13.22 / 10 mg 132% of label	—	MT210-1225-BCSC✓
3 Jan 2026	Perfect Peptides	Krause Analytical	99.73%	9.47 / 10 mg 95% of label	—	PP1410173
31 Dec 2025	Felix Chemical Supply	freedomdiagnosticstesting.com	99.65%	10.12 / 10 mg 101% of label	—	122925-MT2-D
29 Dec 2025	Research Peptides Europe	liquilabs	99.80%	10.78 / 10 mg 108% of label	Pass	Melanotan II/2025-12-03
20 Dec 2025	Oath Peptides	freedomdiagnosticstesting.com	99.73%	4.79 / 5 mg 96% of label	—	56ABF
19 Dec 2025	Modern Aminos	freedomdiagnosticstesting.com	99.73%	11.72 / 10 mg 117% of label	Pass	BX-P-W5K7
18 Dec 2025	Certified Peptides	Vanguard Laboratory	99.27%	8.58 / 10 mg 86% of label	Pass	MEL200003
12 Dec 2025	OROS Research	freedomdiagnosticstesting.com	99.59%	12.18 / 10 mg 122% of label	—	8714419
9 Dec 2025	Core Peptides	Vanguard Laboratory	99.03%	10.93 / 10 mg 109% of label	—	C73480
5 Dec 2025	Beyond Peptides	Janoshik Labs	99.69%	11.22 / 10 mg 112% of label	—	002
5 Dec 2025	Simple Peptide	freedomdiagnosticstesting.com	99.69%	10.92 / 10 mg 109% of label	—	MEL210110722025-04
4 Dec 2025	NG Peptide	freedomdiagnosticstesting.com	99.84%	10.66 / 10 mg 107% of label	—	MT01
2 Dec 2025	Alpha Carbon Labs	Janoshik Labs	99.74%	10.98 / 10 mg 110% of label	—	View record →
30 Nov 2025	Felix Chemical Supply	freedomdiagnosticstesting.com	99.87%	10.26 / 10 mg 103% of label	—	112425-MT2-D
26 Nov 2025	Glacier Aminos	freedomdiagnosticstesting.com	99.49%	8.91 / 10 mg 89% of label	—	MT210GA01
26 Nov 2025	Glacier Aminos	freedomdiagnosticstesting.com	99.49%	9.66 / 10 mg 97% of label	—	MT210GA01
25 Nov 2025	Tydes	Janoshik Labs	99.57%	13.04 / 10 mg 130% of label	—	MT210111925
25 Nov 2025	Skye Peptides	Janoshik Labs	99.50%	13.54 / 10 mg 135% of label	—	MT225-10-004
24 Nov 2025	Peptidex	Janoshik Labs	99.48%	11.21 / 10 mg 112% of label	—	ML10/2025-10-20-A
24 Nov 2025	Orbitrex Peptides	Chromate	99.04%	10.66 / 10 mg 107% of label	Pass	MT2101125
23 Nov 2025	Pura Peptides	freedomdiagnosticstesting.com	99.75%	12.28 / 10 mg 123% of label	—	2511200019
22 Nov 2025	Nova Peptide Supply	freedomdiagnosticstesting.com	99.87%	10.77 / 10 mg 108% of label	Pass	View record →
21 Nov 2025	24Peptides	liquilabs	99.80%	11.22 / 10 mg 112% of label	Pass	GF112025065
20 Nov 2025	Peptira	freedomdiagnosticstesting.com	99.78%	10.84 / 10 mg 108% of label	Pass	MT2-10-001
20 Nov 2025	Optima Supply	Janoshik Labs	99.45%	8.18 / 10 mg 82% of label	—	View record →
20 Nov 2025	Optima Supply	Janoshik Labs	99.60%	8.5 / 10 mg 85% of label	—	View record →
20 Nov 2025	Hydro Research Peptides	Janoshik Labs	99.45%	8.18 / 10 mg 82% of label	—	HYDRO11WNG8L
14 Nov 2025	Peptide Koning	Janoshik Labs	99.90%	10.06 / 10 mg 101% of label	—	PK-RG-008
12 Nov 2025	Licensed Peptides	Vanguard Laboratory	98.70%	9.86 / 10 mg 99% of label	—	View record →
11 Nov 2025	Disguised Alpha	Chromate	99.36%	10.87 / 10 mg 109% of label	—	View record →
11 Nov 2025	Amino USA	BioRegen	99.86%	10.43 / 10 mg 104% of label	—	25MT10-0004
10 Nov 2025	Atomik Labz	Janoshik Labs	99.90%	12.34 / 10 mg 123% of label	—	M1024M
5 Nov 2025	HkRoids	freedomdiagnosticstesting.com	99.92%	12.94 / 20 mg 65% of labelCheck label	—	05672
3 Nov 2025	Cernum Biosciences	Janoshik Labs	99.75%	9.63 / 10 mg 96% of label	—	View record →
1 Nov 2025	NuScience Peptides	freedomdiagnosticstesting.com	99.56%	13.07 / 10 mg 131% of label	—	000256
31 Oct 2025	Peptide Pros	freedomdiagnosticstesting.com	99.90%	13.08 / 10 mg 131% of label	—	MTZV-110125
28 Oct 2025	Luvion Bio Peptides	freedomdiagnosticstesting.com	99.77%	15.16 / 10 mg 152% of labelCheck label	—	LBL-0625-ML10-1048
28 Oct 2025	Instant Peptides	freedomdiagnosticstesting.com	99.93%	12.51 / 10 mg 125% of label	—	2025-0274-A
23 Oct 2025	Iron Peptides	freedomdiagnosticstesting.com	99.89%	12.43 / 10 mg 124% of label	—	2510230094
21 Oct 2025	Oath Peptides	freedomdiagnosticstesting.com	99.66%	13.16 / 10 mg 132% of label	—	11HBE
16 Oct 2025	RUO.bio	Janoshik Labs	99.43%	10.9 / 10 mg 109% of label	—	View record →
16 Oct 2025	Particle Peptides	liquilabs	99.80%	9.94 / 10 mg 99% of label	Pass	2025277
14 Oct 2025	Research Chem HQ	Vanguard Laboratory	99.36%	10.9 / 10 mg 109% of label	Pass	PS2N9
10 Oct 2025	RC Peptides	Janoshik Labs	99.95%	9.83 / 10 mg 98% of label	—	005
6 Oct 2025	Strate Labs	Janoshik Labs	99.72%	12.27 / 12 mg 102% of label	—	1025
4 Oct 2025	Ion Peptide	freedomdiagnosticstesting.com	99.53%	9.35 / 10 mg 94% of label	—	MTII-1025
1 Oct 2025	Felix Chemical Supply	freedomdiagnosticstesting.com	99.72%	13.42 / 10 mg 134% of label	—	092525-MT2-D
1 Oct 2025	Honest Peptide	Janoshik Labs	99.64%	10.8 / 10 mg 108% of label	—	ML1009122025
25 Sep 2025	MyPurePeptide	Janoshik Labs	99.94%	10.06 / 10 mg 101% of label	—	20250906
24 Sep 2025	EZ Peps	Janoshik Labs	99.60%	11.95 / 10 mg 119% of label	—	MT2100913✓
22 Sep 2025	Skye Peptides	Janoshik Labs	99.95%	12.05 / 10 mg 121% of label	—	MT225-10-003
18 Sep 2025	Neovia Peptides	Janoshik Labs	99.85%	11.24 / 10 mg 112% of label	—	LIYU20250901
13 Sep 2025	Blank Peptides	freedomdiagnosticstesting.com	99.95%	8.83 / 10 mg 88% of label	—	MEL20903202025-J
13 Sep 2025	Simple Peptide	freedomdiagnosticstesting.com	99.95%	8.83 / 10 mg 88% of label	—	MEL209032025-J
12 Sep 2025	Synthesis PeptidesBlendMelanotan II/Glycine	freedomdiagnosticstesting.com	99.67%	9.71 / 10 mg 97% of label	—	View record →
28 Aug 2025	Bulk Peptide Supply	MDx BioAnalytical Laboratory	98.81%	10.13 / 10 mg 101% of label	—	QC251071
23 Aug 2025	OROS Research	freedomdiagnosticstesting.com	99.62%	9.77 / 10 mg 98% of label	—	395362
21 Aug 2025	Felix Chemical Supply	Chromate	99.73%	11.51 / 10 mg 115% of label	—	081125-MT2-0
14 Aug 2025	Srylab	Janoshik Labs	99.92%	12.71 / 10 mg 127% of label	—	H20830825
7 Aug 2025	TNN Peptides	freedomdiagnosticstesting.com	99.53%	10.86 / 10 mg 109% of label	—	A2025210
29 Jul 2025	EVO Labs Research	Janoshik Labs	99.74%	10.62 / 10 mg 106% of label	—	0010825
22 Jul 2025	Soma ChemsClosed	Chromate	99.46%	10.63 / 10 mg 106% of label	—	SOMA1NE42K24
22 Jul 2025	HPR	Janoshik Labs	99.93%	10.05 / 10 mg 101% of label	—	MT626L
16 Jul 2025	Peptira	Janoshik Labs	99.95%	11.15 / 10 mg 112% of label	—	MT2-10-001
11 Jul 2025	Peptidology	Vanguard Laboratory	99.80%	9.98 / 10 mg 100% of label	—	1357
9 Jul 2025	Growth Guys	Janoshik Labs	99.74%	10.74 / 10 mg 107% of label	—	MT202
4 Jul 2025	OROS Research	freedomdiagnosticstesting.com	99.70%	10.74 / 10 mg 107% of label	—	395221
30 Jun 2025	PurePeptides.Bio	MZ Biolabs	99.85%	9.78 / 10 mg 98% of label	—	JYC1001
30 Jun 2025	Eternal Peptides	Janoshik Labs	99.08%	10.61 / 10 mg 106% of label	—	EP-250403-MT10
25 Jun 2025	Amino USA	BioRegen	99.61%	3.91 / 10 mg 39% of labelCheck label	—	25MT10-0003
23 Jun 2025	Omega Peptides Australia	Janoshik Labs	99.61%	12.45 / 10 mg 124% of label	—	mt2100610
19 Jun 2025	Kimera Chems	Vanguard Laboratory	99.71%	10.69 / 10 mg 107% of label	—	View record →
17 Jun 2025	Amplified Labs	Chromate	99.93%	10.39 / 10 mg 104% of label	—	EMP-MT2-250528-A10
10 Jun 2025	Research Chem HQ	Chromate	99.85%	9.05 / 10 mg 91% of label	—	#001✓
8 Jun 2025	Ignite Peptides	Janoshik Labs	99.26%	13.16 / 10 mg 132% of label	—	MT2-250527-197✓
22 May 2025	Molecular Solutions Peptides	Janoshik Labs	99.47%	11.62 / 10 mg 116% of label	—	R250327-MT2-J001✓
16 May 2025	Royal Peptides	Janoshik Labs	99.58%	12.56 / 10 mg 126% of label	—	mt2100511
15 May 2025	Qing Li Peptide	Janoshik Labs	99.56%	10.42 / 10 mg 104% of label	—	ML10/2025-05
7 May 2025	Research Chem HQ	Chromate	99.76%	8.5 / 10 mg 85% of label	—	View record →
30 Apr 2025	Skye Peptides	Janoshik Labs	99.27%	12.22 / 10 mg 122% of label	—	MT225-10-002
27 Apr 2025	BleauGenics	Janoshik Labs	99.72%	10.8 / 10 mg 108% of label	—	View record →
21 Apr 2025	Profound Aminos	MZ Biolabs	99.88%	11.12 / 10 mg 111% of label	—	2025-04-03
7 Apr 2025	Pura Peptides	Chromate	99.66%	11.93 / 10 mg 119% of label	—	MT2-012925
27 Mar 2025	Skye Peptides	Janoshik Labs	99.71%	11.71 / 10 mg 117% of label	—	MT225-10-001
12 Mar 2025	HkRoids	Janoshik Labs	99.92%	11.13 / 10 mg 111% of label	—	View record →
28 Feb 2025	Biolabshop	Analiza Białek	98.00%	10.41 / 10 mg 104% of label	—	100007021
27 Feb 2025	Peptidic	Janoshik Labs	99.77%	11.97 / 10 mg 120% of label	—	042025
24 Feb 2025	Biolabshop	Analiza Białek	98.00%	10.41 / 10 mg 104% of label	—	100007021
20 Feb 2025	Biopeptitech	Vanguard Laboratory	98.33%	7.2 / 10 mg 72% of labelCheck label	—	1001
1 Jan 2025	Vandl Labs	freedomdiagnosticstesting.com	99.84%	13.36 / 10 mg 134% of label	—	View record →
30 Dec 2024	Growth Guys	Janoshik Labs	99.79%	12.8 / 10 mg 128% of label	—	MT201
8 Nov 2024	Atomik Labz	Janoshik Labs	98.97%	11.02 / 10 mg 110% of label	—	MM1101
4 Oct 2024	Royal Peptides	Janoshik Labs	99.16%	11.34 / 10 mg 113% of label	—	View record →
14 Jun 2024	Polaris Peptides	Janoshik Labs	99.68%	17.24 / 10 mg 172% of labelCheck label	—	POL-M210-1
8 Jan 2024	Amino Amigos	Janoshik Labs	99.53%	9.11 / 9 mg 101% of label	—	MEL2.A24B
8 Sep 2023	Amino USA	freedomdiagnosticstesting.com	97.77%	10 / 10 mg 100% of label	—	2023-08-25
8 Aug 2023	Skye Peptides	Janoshik Labs	99.81%	9.75 / 10 mg 98% of label	—	1210-10-001
23 Jul 2023	Atomik Labz	Vanguard Laboratory	99.34%	10.03 / 10 mg 100% of label	—	M062325M

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 Melanotan II (MT-2) 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.