Melanotan 2 is a synthetic cyclic α-MSH analog (CAS 121062-08-6). Formula/mass anchors and lot COA purity panels. Research use only.
Melanotan 2 is a synthetic cyclic heptapeptide analog of alpha-melanocyte-stimulating hormone (α-MSH). It is a discrete research material with its own CAS, formula, molar mass, and lot documentation — not a catalogue nickname for every “MT-2” listing, and not a synonym for related melanocortin-family research SKUs.
If you found “melanotan 2,” “melanotan-2,” “melanotan ii,” “mt-2,” “melanotan 2 coa,” or “melanotan 2 third party tested” in a listing, the useful questions are which registry fields the seller claims, whether the certificate matches those anchors, and how the vial lot is documented. Aliases vary; registry fields and certificates do not.
This page covers Peptide Foundry’s published identity anchors, the purity panels a research buyer should demand, a worked third-party lot for the live 10 mg option, and short tool-compound naming literacy — then soft-handoffs to the Melanotan 2 research product page. Research use only.
Key points
- Melanotan 2 = synthetic cyclic heptapeptide analog of α-MSH; supplied as lyophilized research material.
- Peptide Foundry catalog anchors (live PDP): CAS 121062-08-6, formula C50H69N15O9, molar mass 1024.2 g/mol — match certificate fields to these claims. A letter sequence is not listed on the live PDP and is not invented here.
- SKU
PF-MELANOTAN-2; live size option 10 mg lyophilized — match each vial to its own lot certificate (current worked example = FO776 / ILS).- Demand a lot-matched COA: HPLC purity with method/wavelength when stated, identity method, named laboratory, and preferably independent portal verify; “third-party tested” or “high purity” without lot + named lab is unfinished.
- Research use only — not for human or veterinary use; not a tanning, pigmentation, sexual, wellness, or consumer product.
What is Melanotan 2?
Melanotan 2 is a synthetic cyclic heptapeptide designed as an analog of alpha-melanocyte-stimulating hormone (α-MSH). The research material on this page is that defined analog class with the published registry anchors below — not a crude tissue extract and not a brand stack.
A short historical note anchors naming only. University of Arizona melanocortin research in published literature examined synthetic α-MSH analogs as tool compounds interacting with melanocortin receptor subtypes in cell-culture and rodent experimental systems. That is origin and tool-compound / literature-class history — not a catalogue mechanism claim, not registry proof, and not a reason to treat every “MT-2” nickname as interchangeable.
Physical form on research listings is lyophilized solid. Peptide Foundry’s current catalog documents describe lyophilized powder under SKU PF-MELANOTAN-2 at a 10 mg size option. Appearance is a handling observation — not a purity proof and not a substitute for HPLC or identity data on a certificate.
Market aliases include Melanotan 2, Melanotan II, Melanotan-II, MT-2, and MT2. Aliases help search and inventory. They are not identity proof until you have CAS, formula, molar mass, cyclic heptapeptide / α-MSH-analog framing, and a lot-matched certificate. The live Peptide Foundry PDP does not publish a one-letter sequence; this page follows that publication set and does not invent one.
Chemical identity anchors
Peptide Foundry publishes a fixed identity set for single-vial Melanotan 2. The values below match the live catalog chemistry table at the time of writing. Confirm against the current product page if a lot or chemistry block rotates after publish.
Naming and structural class
Class: synthetic cyclic heptapeptide α-MSH analog. SKU PF-MELANOTAN-2; size option on the live listing at publish time: 10 mg lyophilized.
CAS, formula, and molar mass
| Field | Peptide Foundry catalog (live /product/melanotan-2/) |
|---|---|
| CAS | 121062-08-6 |
| Formula | C50H69N15O9 |
| Molar mass | 1024.2 g/mol |
| Class / naming | Synthetic cyclic heptapeptide analog of α-MSH |
| SKU | PF-MELANOTAN-2 |
| Form | Lyophilized |
| Size (live option) | 10 mg |
Market pages sometimes round mass differently or recycle CAS strings across unrelated melanocortin nicknames. The practical rule is: match the vendor’s stated CAS + formula + molar mass + analog framing to the lot COA, then prefer orthogonal identity (MS / HPLC-RTM) over the nickname alone.
What a Melanotan 2 COA should show
A certificate of analysis is stronger when it is lot-specific, names the laboratory, states methods, and can be checked outside the supplier’s own site. For the full verification workflow — batch match, named lab, HPLC versus identity, biosafety panels, portal codes — see How to read a research-peptide COA.
Minimum research COA fields
- A lot / batch ID that matches the vial character for character
- Test or report date(s) and a named laboratory
- HPLC purity with method (and wavelength when stated — for example 214 nm)
- An identity method (MS and/or HPLC-RTM)
- Product name / composition consistent with the label and the vendor’s published anchors
“Third-party tested,” “high purity Melanotan 2,” or “99%+” without a named lab and a lot number is an unfinished claim.
Stronger panels (when claimed)
- Mass-spectrometry or HPLC-RTM identity confirmation
- Net peptide content versus labeled mass when reported
- Heavy metals by ICP-MS against stated limits
- Sterility / no growth
- Endotoxin (for example USP <85> / LAL)
- Illicit-substance screen (for example fentanyl — not detected)
These describe composition and contamination panels for research documentation. They are not a safety-for-human-use claim.
Worked example — lot FO776 (10 mg)
As published on the current Peptide Foundry Melanotan 2 listing at the time of writing for the 10 mg option:
| Field | Value |
|---|---|
| Lot | FO776 |
| Size | 10 mg |
| Laboratory | ILS Laboratories |
| Received | 07/16/2026 |
| Tested | 07/19/2026 |
| Purity | 99.76% (HPLC @ 214 nm) |
| Net peptide content | 10.45 mg |
| Identity | HPLC-RTM — Pass |
| Fentanyl screen | Not Detected |
| Heavy metals | Pass |
| Sterility | No Growth |
| Endotoxin | NMT 0.05 EU/mL |
| Access code | KSGK4LSN |
Cite those figures as Peptide Foundry–published transparency for this lot — not a universal industry floor. Re-verify against the live product panel if the lot rotates after publish.
Three steps that travel with any lot, not just FO776:
- Match the lot number on the vial to the lot on the certificate.
- Confirm CAS, formula, and labeled mass against the certificate and the product label.
- Verify the access code on the issuing laboratory’s own portal (ILS for FO776: access code KSGK4LSN) — not only by opening a PDF hosted by the supplier.
Portable vendor criteria beyond a single SKU: USA research-peptide vendor criteria.
Related research peers (soft handoffs)
Research catalogues sometimes co-browse melanocortin-family or adjacent materials beside Melanotan 2 listings. Co-browsing is inventory adjacency — not a synonym set and not a protocol for combining materials.
- How to read a research-peptide COA and USA research-peptide vendor criteria — same trust workflow.
- Lyophilized peptide reconstitution — general lab diluent literacy without Melanotan 2 schedules.
- Optional soft melanocortin-family identity peer on the catalog: PT-141 research product page — identity peer only; match each vial to its own certificate. No dual-CTA stack framing.
Match each vial to its own registry fields and lot certificate. Shared catalogue adjacency is literacy — not a stack recommendation.
Tool-compound / naming literacy (preclinical framing only)
Receptor-subtype language is useful here only as classification of experimental systems in published literature. It does not establish catalogue-product outcomes in people, and it does not convert a citation into a certificate. Keep this section shorter than identity and COA literacy.
| Literature / naming class | Acceptable framing on this page | Not used as product framing |
|---|---|---|
| Cyclic heptapeptide α-MSH analog | Listing name Melanotan 2 / Melanotan II / MT-2 refers to a published synthetic cyclic heptapeptide α-MSH analog class | Tanning, pigmentation-benefit, or sunless-tan product claims |
| Melanocortin receptor subtype interactions in cell-culture / rodent models | Examined in preclinical publications as a tool compound interacting with melanocortin receptor subtypes in experimental systems | Sexual, libido, erectile, or wellness product claims |
Lifestyle titles that dominate wider SERPs sit outside the scope of this RUO identity page and are not summarized as product use. Identity remains an analytical question answered by CAS, formula, analog framing, and the lot COA.
Storage and lab handling (lyophilized)
Standard laboratory practice for lyophilized synthetic peptides applies:
- Storage. Sealed vials at −20°C, protected from light and moisture. Lyophilized material is substantially more stable than solution.
- Temperature excursions. Brief ambient exposure in transit is normal for lyophilized material. Return vials to −20°C on arrival.
- Freeze–thaw. Minimize repeated freeze–thaw.
- Traceability. Keep the lot number with the material — lot number ties a vial back to its certificate.
Assay-specific handling follows your institution’s SOPs. This page does not publish personal reconstitution schedules, nasal protocols, or solution-use protocols for Melanotan 2. General lyophilized-material diluent literacy (without compound-specific schedules) lives at Lyophilized peptide reconstitution.
Common questions
What is Melanotan 2’s CAS, formula, and mass?
CAS 121062-08-6; formula C50H69N15O9; molar mass 1024.2 g/mol; synthetic cyclic heptapeptide analog of α-MSH. Peptide Foundry catalogs the material as SKU PF-MELANOTAN-2 (10 mg lyophilized option at publish time). The live PDP does not publish a letter amino-acid sequence; prefer registry fields over listing nicknames.
Is Melanotan 2 the same as Melanotan II / MT-2 / MT2?
Those strings are the same listing/alias family for this cyclic heptapeptide α-MSH analog class when CAS, formula, molar mass, and the lot certificate agree. Styling is not a second compound. Match registry fields and the vial lot — do not treat an alternate hyphenation as identity proof by itself.
What makes a Melanotan 2 COA usable — and what does “third-party tested” require?
Lot match to the vial, a named laboratory, HPLC purity with method/wavelength when stated, an identity method (MS and/or HPLC-RTM), and preferably an independent portal verify path. Stronger documentation adds net peptide content, heavy metals, sterility, endotoxin, and illicit screens when claimed. Worked FO776 figures above — ILS Laboratories, HPLC 99.76% @ 214 nm, HPLC-RTM pass, net 10.45 mg, access code KSGK4LSN — are an example of that pattern on Peptide Foundry’s live listing. Workflow detail: How to read a research-peptide COA.
Is this for tanning, pigmentation, sexual use, or human use?
No. Peptide Foundry supplies Melanotan 2 strictly for laboratory and research use by qualified researchers. Mentions of melanocortin receptor subtype interactions in published preclinical literature are tool-compound / literature-class context only — not product benefits and not human therapy. This page does not describe consumer finished goods, personal-use schedules, nasal or injection protocols, or stack recommendations. Melanotan 2 here is not a drug, supplement, consumer finished good, or veterinary product, and not for use in people or animals.
For the current lot certificate and product specifications, see the Melanotan 2 research product page. Related library reading: How to read a research-peptide COA, USA research-peptide vendor criteria, and Lyophilized peptide reconstitution.
Research use only. Nothing on this page describes or implies use in humans or animals. Tool-compound mentions of melanocortin receptor subtype interactions refer only to preclinical literature contexts and are not product outcomes.