Melanotan II from MT2 Labs is a synthetic cyclic α-MSH analog (7 residues) designed for activity at the melanocortin receptors MC1R, MC3R, MC4R and MC5R, supplied as a white lyophilized powder in 10 mg vials. Every lot is independently tested, and its results are published as a lot record with the certificate PDF.
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Specifications and current testing status in one place.
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.
complete MT2 specifications.
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. Lyophilized material absorbs moisture from the air, and absorbed moisture restarts the reactions that drying slows, so keep vials sealed until needed. Storage and stability guide.
| 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 |
Each vial size is listed with its current tested lot. Price: $29.99, with bundle pricing (2 vials save 5%; 3 or more vials save 10%). Current prices are always on klow.bio.
| 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 |
Ordering and shipping. Melanotan II is sold through klow.bio, operated by Klow Labs LLC. Orders ship the next business day. Same-day cutoff is 4:00 PM CT, with overnight and 2-day options at checkout. See shipping and returns.
All testing is performed by Freedom Diagnostics, an independent laboratory, on every lot.
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.
Identity by LC-MS, with the laboratory’s reference numbers.
| 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 |
HPLC-UV purity for each current lot.
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).
The molecular formula is C50H69N15O9 and the average molecular weight is 1024.18 g/mol. The peptide has 7 residues.
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.
Yes. MT2 is the common abbreviation for Melanotan II, a cyclic α-MSH analog, C50H69N15O9, 1024.18 g/mol.
A lactam bond links aspartate 2 and lysine 7, locking the receptor-binding core into a ring that is more resistant to enzymatic breakdown than a linear chain.
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.
Enter the lot number from your vial label at mt2.bio/verify/ to see that lot's results. To confirm with the laboratory directly: Scan the Freedom Diagnostics QR code printed on the certificate, then search for klow.bio under the Company tab to view the laboratory record.
The current price is $29.99, with bundle pricing (2 vials save 5%; 3 or more vials save 10%). Current pricing is always listed on Klow.bio.
Orders ship the next business day. Same-day cutoff is 4:00 PM CT, with overnight and 2-day options at checkout.
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.
10 mg vials. Current lot KB32432 tested at 99.90% purity with identity confirmed by LC-MS. Current purchasing is available through Klow.bio.