Melanotan 2 Canada

What Is Melanotan 2?

Melanotan 2 — written MT-2 or MT2, and both refer to the same compound — is a synthetic cyclic heptapeptide, an analog of α-MSH (alpha-melanocyte stimulating hormone), the endogenous peptide that signals through the melanocortin receptor system.

Its defining property is that it is non-selective

MT-2 binds all four principal melanocortin receptors: MC1R, MC3R, MC4R, and MC5R. The research literature attributes its broad and somewhat unpredictable effect profile directly to that lack of selectivity.

These receptors do entirely different things:

• MC1R — melanogenesis. Melanin synthesis in melanocytes.
• MC3R / MC4R — central signalling. Appetite regulation, and the sexual-function pathways in the hypothalamus.
• MC5R — exocrine gland function.

A single compound activating all of them will produce effects across all of them. That is the mechanistic reason MT-2’s effect profile is as broad as it is, and it is the reason a more selective molecule was eventually engineered out of it.

Melanotan 2 and PT-141: The Compound That Came Out of It

This is the most consequential thing in MT-2’s history, and it is worth understanding before anything else.

During melanocortin research, effects on sexual-function pathways were observed as an unintended finding — a consequence of MC4R agonism, in studies whose endpoint was something else entirely.

That observation did not stay a footnote. Palatin Technologies engineered a molecule to isolate it: keep the MC3R and MC4R activity, drop the MC1R activity responsible for melanogenesis.

The result was bremelanotide — PT-141 — which went on to become the first melanocortin receptor agonist ever approved by the FDA (2019).

MT-2 is the non-selective parent. PT-141 is what happens when you remove the receptor you didn’t want. The two compounds are a case study in why selectivity is a design goal rather than a technicality.

Melanotan 2: What the Research Reports

Melanogenesis

Increased melanin synthesis via MC1R agonism. This is the most-studied effect and the one the compound was originally developed to investigate. Melanocyte models report increased melanin production.

Appetite and food intake

MC4R agonism affects appetite regulation, and rodent models report effects on food intake. MC4R is one of the better-characterised appetite receptors in the hypothalamus.

Sexual-function pathways

Also MC4R-mediated. This is the observation that led directly to the development of PT-141.

Photoprotection research

UV-response models — the original research context, given melanin’s role in UV absorption.

All findings are preclinical or from early-stage work. MT-2 has never completed clinical development in any jurisdiction.

Melanotan 2 Dosage in the Published Research

The MT-2 literature is limited and largely preclinical — and that is itself the most important thing to say about it. Unlike PT-141, which went through Phase 3, MT-2 was never carried through development.

Preclinical

Studies report quantities in the microgram-per-kilogram range, administered subcutaneously.

Early human work

Early melanocortin research reported quantities in the low-milligram range per administration. That work was small and was not carried through to development — and the reason it stopped is relevant to any assessment of the compound.

No dose of MT-2 has been established as safe or effective by any regulatory authority. CompoundPlug provides no dosing recommendations.

Melanotan 2 Side Effects Reported in Studies

MT-2 has a more substantial adverse-effect record than most compounds in this catalog, and it is a direct consequence of the non-selectivity.

Commonly reported

• Nausea — attributed to central melanocortin activation
• Flushing
• Spontaneous erections — MC4R agonism, the effect PT-141 was built to isolate
• Darkening of existing nevi and freckles — MC1R agonism acting where melanocytes already are

⚠️ The dermatological concern

This must be stated plainly, and it is specific to melanogenic compounds rather than a generic caution.

Case reports in the medical literature describe changes in the appearance of existing nevi — moles — following MT-2 use, and have raised questions about melanoma risk.

The mechanistic concern is coherent rather than speculative: MT-2 stimulates melanocytes. Melanoma is a cancer of melanocytes. A compound that drives melanocyte activity, applied to a person who already has atypical melanocytes, raises an obvious and unresolved question.

This is an active concern in the literature, not a theoretical one. It is the primary reason MT-2 is studied in cell culture rather than administered, and it is a reason regulators have taken an interest.

Regulatory

MT-2 was placed on the FDA’s Category 2 restricted list for pharmacy compounding in 2023; the restriction was lifted in 2026 without addition to the permitted list. Health Canada has issued warnings regarding melanotan products sold in Canada.

MT2 Peptide, MT-2, Melanotan II: The Naming

MT2 peptide, MT-2, MT II and Melanotan II all refer to this compound. The variation is orthographic rather than chemical — the hyphen and the roman numeral are conventions, not distinctions, and no supplier or paper using one form is describing a different molecule from one using another.

Two naming distinctions that are real and worth keeping straight:

• Melanotan 1 is a different compound. Afamelanotide — also called melanotan-1 or MT-1 — is a linear α-MSH analog with far greater MC1R selectivity. It is not stocked here, and it is not interchangeable with MT-2 in any research context.
• “Melanotan” without a number is ambiguous and appears in the literature and in regulatory notices referring to either. Where a source does not specify, the compound is not identified.

This page, and the vial it describes, is Melanotan 2 — the non-selective heptapeptide, molecular weight approximately 1024.2.

Melanotan 2 Research Applications

• Melanocortin receptor pharmacology — MC1R/MC3R/MC4R/MC5R binding; the reference non-selective agonist
• Comparative selectivity — MT-2 against PT-141; what removing MC1R changes
• Melanogenesis — melanin synthesis pathways in melanocyte models
• Photoprotection — UV-response models
• Appetite research — MC4R signalling in rodent models
• Receptor engineering — a case study in why selectivity is a design goal

All applications preclinical, in-vitro / in-vivo only.

Is Melanotan 2 Legal in Canada?

Melanotan 2 is not an authorized health product in Canada. No DIN, no NPN, not reviewed by Health Canada, not approved for human use. Health Canada has issued public warnings about unauthorized melanotan products.

It is not a controlled substance under the CDSA.

CompoundPlug supplies MT-2 strictly as a research chemical for in-vitro and in-vivo laboratory research, and makes no cosmetic claims of any kind. See Research Use Only.

Melanotan 2 Reconstitution & Storage

Water-soluble. Bacteriostatic water, added slowly down the vial wall. Swirl, never vortex.

Storage: lyophilized and sealed, up to 24 months. Reconstituted, 2–8 °C, 3–4 weeks, protected from light.

Melanotan 2 calculator · Reconstitution guide

Quality & Verification

Independent HPLC and mass-spec testing, published rather than asserted.

MT-2 and PT-141 are structurally close — and that is exactly why identity testing matters on this compound.

Both are cyclic heptapeptides derived from α-MSH. Their molecular weights are approximately 1024.2 and 1025.2 — roughly one dalton apart.

They are pharmacologically different molecules. MT-2 is non-selective and activates MC1R; PT-141 has substantially reduced MC1R activity. That is the difference between a compound that drives melanogenesis and one that does not — and a purity test cannot see it.

Mass spectrometry resolves compounds a single dalton apart. On these two, it is the only test that identifies which is in the vial.

Vials measured by peptide content. Published analysis in the COA Library, tied to the lot.

Buy Melanotan 2 in Canada

Research-grade Melanotan 2 — 10mg lyophilized powder, ≥99% HPLC purity, mass-spec verified, published reference COA.

• Molecular weight published — and it matters, because PT-141 is a dalton away
• Ships from within Canada — Canada Post Xpresspost, tracked
• CAD pricing · Interac e-Transfer or crypto · discreet packaging

Related: PT-141 — the selective molecule engineered out of MT-2. Browse Libido Peptides.

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