A MT2 research supplier built around testing and transparency.
MT2 Labs is a dedicated MT2 research supplier with a controlled sourcing and quality-assurance program. Research material is sourced through our qualified manufacturing supply chain and subjected to analytical testing and lot-level documentation before release. Current availability is provided through Klow.bio.
For laboratory research use only. MT2 Labs does not provide medical advice or usage guidance.
The essential facts about Melanotan II and MT2 Labs. Every figure on this page comes from the published certificates of analysis or the product specification.
Last updated
Melanotan II (MT2) is a synthetic cyclic heptapeptide built on the central sequence of α-melanocyte-stimulating hormone. A lactam bridge joins the side chain of aspartate 2 to the side chain of lysine 7, closing a six-residue ring around the His-D-Phe-Arg-Trp core that melanocortin receptors recognise. The ring, the D-phenylalanine and an N-terminal acetyl-norleucine make MT2 compact and resistant to peptidases, and it binds several melanocortin receptor subtypes (MC1R, MC3R, MC4R and MC5R) rather than one.
MT2 Labs supplies Melanotan II as a lyophilized powder in 10 mg vials. Every lot is tested by an independent laboratory for HPLC-UV purity, LC-MS identity and net content, and the certificate is published here before sale through Klow.bio.
MT2 is a cyclic peptide and a different compound from Melanotan I (MT1), a longer linear analog. Their formulas and molecular weights differ (1024.18 vs 1646.85 g/mol).
MT2 is Ac-Nle-cyclo[Asp-His-D-Phe-Arg-Trp-Lys]-NH2. The cyclizing amide bond between Asp2 and Lys7 side chains removes one water from the linear sequence, which is reflected in the formula. The N-terminus is acetylated and the C-terminus amidated, so the molecule has no free terminal charges; arginine is its main basic group.
Melanotan II is supplied as a white lyophilized powder in 10 mg vials. It is sold through klow.bio, operated by Klow Labs LLC, where current pricing, bundle discounts and shipping options are listed. Orders ship the next business day. Same-day cutoff is 4:00 PM CT, with overnight and 2-day options at checkout.
| Product | Melanotan II |
|---|---|
| Type | Synthetic cyclic α-MSH analog (7 residues) |
| Molecular formula | C50H69N15O9 |
| Molecular weight | 1024.18 g/mol (average) |
| Length | 7 residues |
| Sequence | Ac-Nle-cyclo[Asp-His-D-Phe-Arg-Trp-Lys]-NH2 |
| Cyclization | Lactam, Asp2–Lys7 side chains |
| N-terminus | Acetyl-norleucine |
| C-terminus | Amide (Lys7-NH2) |
| CAS number | 121062-08-6 |
| Receptor design | Melanocortin receptors MC1R, MC3R, MC4R and MC5R |
| Form | White lyophilized powder |
| Vial sizes | 10 mg |
| Purity specification | ≥95% (HPLC-UV) |
| Purity, current lots | 99.90% |
| Storage | Store sealed, dry and protected from light at the temperature stated on the vial label. Allow a cold vial to reach room temperature before opening. |
| Designation | Research use only |
MT2 research material from MT2 Labs is available through klow.bio, the online store of MT2 Labs’ parent company, Klow Labs LLC. Product information, lot results and the certificate of analysis for every lot are published here on mt2.bio.
Melanotan II comes in 10 mg vials, currently priced at $29.99, with bundle pricing (2 vials save 5%; 3 or more vials save 10%). Orders ship the next business day. Same-day cutoff is 4:00 PM CT, with overnight and 2-day options at checkout.
| Vial size | Current lot | Purity (HPLC-UV) | Identity | Net content | Endotoxin | Certificate | Order |
|---|---|---|---|---|---|---|---|
| 10 mg | KB32432 | 99.90% | Confirmed | 12.33 mg | Not tested | Lot KB32432 | Order 10 mg |
MT2 Labs publishes lot-specific analytical documentation for its MT2 research material. Each item below is published for every lot and can be checked against the laboratory record.
Every lot is tested by Freedom Diagnostics, an independent analytical laboratory. Published results come from the laboratory's certificate, not in-house testing.
Every lot's certificate is published as a PDF, with the chromatogram behind the purity figure and the mass spectrum behind the identity result, alongside a readable lot record.
LC-MS separates the sample and measures the mass of the main component, confirming it has the molecular weight expected for the compound. The method is named on every lot record, so it is clear what the result does and does not establish.
Current lots test at 99.90% by HPLC-UV, well above the ≥95% release specification, with net content measured on every lot.
Every certificate carries the laboratory's QR code. You can confirm results directly with the lab instead of taking our copy on trust.
Lots without endotoxin or microbial testing say "Not tested". Each certificate page explains what the tests do and don't establish.
MT2 Labs is built around five things: a dedicated MT2 focus, a controlled supply chain, independent analytical testing, lot-level transparency and current availability. Each reason below links to the evidence. See the full quality and supply-chain process.
One compound, not a catalog of unrelated products.
Material sourced through qualified manufacturing partners.
≥95% HPLC-UV purity with identity confirmed by LC-MS.
Every lot tested by Freedom Diagnostics, with the results shown.
A public record for every lot, with dates and laboratory reference numbers.
The laboratory certificate for each lot.
Look up any lot by the number on the vial.
Clear about what the material is for and what we don't provide.
Live stock, pricing and checkout.
The questions worth asking any supplier of MT2 research material, why each one matters, and how MT2 Labs answers them.
| What to check | Why it matters | MT2 Labs |
|---|---|---|
| Independent third-party testing | Results produced by the seller can't be checked independently. | ✓ Every lot tested by Freedom Diagnostics |
| Lot-specific certificates | A generic certificate may not describe the vial you receive. | ✓ Each COA tied to the lot number on the vial label |
| Chromatogram available | A purity figure without the trace behind it can't be evaluated. | ✓ In the certificate PDF for every lot |
| Separate identity test | HPLC purity shows how much of the sample is the main peak, not which compound the peak is. | ✓ LC-MS on every lot |
| Measured net content | Confirms how much peptide is actually in the vial. | ✓ Measured on every lot; current lots at or above label size |
| Verifiable with the lab | Prevents altered or reused certificates. | ✓ Lab QR code on every certificate |
| Named company and contact | Accountability requires a real business you can reach. | ✓ Klow Labs LLC, Chicago; (708) 262-7687 |
Each row is one tested lot. Figures are copied from the laboratory certificate; open a lot to see its full record and download the certificate PDF with its chromatogram and mass spectrum.
| Lot | Vial size | Net content | Purity (HPLC-UV) | Identity (LC-MS) | Endotoxin (LAL) | Microbial (PCR) | Reported | COA |
|---|---|---|---|---|---|---|---|---|
| KB32432 | 10 mg | 12.33 mg | 99.90% | Confirmed | Not tested | Not tested | View lot KB32432 |
Testing laboratory: Freedom Diagnostics. Release specification: purity ≥95% by HPLC-UV with identity confirmed by LC-MS. Results apply only to the lot listed. Certificates list the testing client as Klow.bio / Klow Labs LLC, the company that operates MT2 Labs.
The current lot tested at 99.90% by HPLC-UV. Lot-to-lot comparisons will appear here as further lots are tested.
Measured net content was at or above the labeled vial size for every current lot: 12.33 mg in a 10 mg vial.
A purity figure says the sample is homogeneous; it does not say which compound the main peak is. That is answered by a separate identity test: liquid chromatography–mass spectrometry (LC-MS).
LC-MS separates the sample and measures the mass of the main component, confirming it has the molecular weight expected for the compound. Each certificate reports the identity result together with the mass spectrum it is based on.
| Product | Melanotan II 10 mg |
|---|---|
| Lot | KB32432 |
| Testing laboratory | Freedom Diagnostics |
| Received / reported | Jul 22, 2026 / Jul 25, 2026 |
| Purity (HPLC-UV) | 99.90% |
| Identity (LC-MS) | Confirmed |
| Net content | 12.33 mg |
| Endotoxin / PCR | Not tested / Not tested |
| Accession | 2607220638 |
Three methods appear on Melanotan II certificates. Each answers a different question, and none answers every question on its own, which is why they are used together.
Reversed-phase high-performance liquid chromatography separates the sample's components by hydrophobicity, and a UV detector records each as a peak. Purity is the main peak's area as a percentage of all detected peak area.
Limits: does not identify the peak, and impurities that co-elute or absorb weakly in UV can be under-counted. More on HPLC
The separated sample enters a mass spectrometer via electrospray ionization, which gives the molecule one or more charges. The observed ions, near m/z 1025 (1+) and 513 (2+), are matched against values calculated from Melanotan II's molecular weight of 1024.18.
Limits: confirms molecular weight, not amino-acid order.
The laboratory quantifies the main compound in the tested vial against a standard. It is reported in milligrams next to the labeled vial size.
Limits: measured on the vial tested; other vials from the same lot are expected to be similar but are not individually measured.
You shouldn't have to take a supplier's word for its results. Here's how to check a Melanotan II certificate yourself.
Technical articles on Melanotan II, peptide analysis and laboratory documentation. Sources are limited to NIH and FDA publications. Start at the MT2 research hub.
Retention time, peaks, area normalization and every lot's HPLC result.
DocumentationEvery section of a MT2 COA, red flags, and what it does and doesn't prove.
Analytical methodsPurity vs. content vs. net content, impurity sources and comparing claims.
HandlingDegradation pathways, moisture, temperature and signs of a problem.
Melanotan II is a synthetic cyclic α-MSH analog (7 residues) designed for activity at the melanocortin receptors MC1R, MC3R, MC4R and MC5R. MT2 Labs supplies it as a white lyophilized powder in 10 mg vials, with an independent certificate of analysis for every lot.
MT2 research material is Melanotan II supplied for laboratory research, sold by lot, with each lot's identity, purity and net content documented by an independent laboratory in a published certificate of analysis.
MT2 is a cyclic peptide and a different compound from Melanotan I (MT1), a longer linear analog. Their formulas and molecular weights differ (1024.18 vs 1646.85 g/mol).
Melanotan II is analyzed with complementary methods: HPLC-UV for purity, LC-MS for identity, a quantitative measurement for net content, and, where listed, LAL endotoxin and PCR microbial testing. Results are published per lot at mt2.bio/coa/.
Every lot is tested by Freedom Diagnostics, an independent third-party analytical laboratory. MT2 Labs does not test its own material for published certificates.
Current lots report HPLC-UV purity 99.90%, against a stated release specification of ≥95%. The most recent result is 99.90% for lot KB32432.
A MT2 certificate of analysis is the testing laboratory's report for one lot: the lot number, test dates, methods and results for purity, identity and net content. MT2 Labs publishes every lot's COA as a readable page at mt2.bio/coa/.
Find the lot number printed on your vial label and enter it at mt2.bio/verify/, or open that lot in the COA archive at mt2.bio/coa/.
Scan the Freedom Diagnostics QR code printed on the certificate, then search for klow.bio under the Company tab to view the laboratory record.
Current MT2 research material availability is provided through Klow.bio, the purchasing platform operated by Klow Labs: https://klow.bio/product/mt2/ Lot records, testing information and certificates of analysis are published on mt2.bio so they can be reviewed before purchasing.
Yes. Purchasing information and current availability for MT2 research material are provided through Klow.bio: https://klow.bio/product/mt2/
Yes. Every lot is tested by Freedom Diagnostics, an independent laboratory, for HPLC-UV purity, LC-MS identity and net content. The stated release specification is ≥95% HPLC-UV purity with identity confirmed by LC-MS. The current lot, KB32432, reported 99.90% purity.
MT2 Labs is a dedicated MT2 research supplier with a controlled sourcing and quality-assurance program. Research material is sourced through our qualified manufacturing supply chain and subjected to analytical testing and lot-level documentation before release.
MT2 Labs operates mt2.bio and supplies one research material, Melanotan II, with the analytical record behind every lot. MT2 Labs is operated by Klow Labs LLC, a Chicago company that also operates klow.bio, where Melanotan II is sold.
Our job is narrow on purpose: supply a well-characterized research material and publish the evidence for what is in each vial. We do not provide medical advice, protocols or usage guidance.
10 mg vials. Current lot KB32432 tested at 99.90% purity with identity confirmed by LC-MS. Current purchasing is available through Klow.bio.