What is Melanotan II?

Melanotan II (MT-2) is a synthetic peptide that acts as a non-selective agonist at melanocortin receptors. It is derived from research into alpha-melanocyte-stimulating hormone and is studied mainly for its effect on skin pigmentation.

What does research suggest about Melanotan II?

Melanocortin-receptor effects, including stimulation of melanin production, are well characterized in preclinical animal and laboratory studies. Robust human clinical evidence is limited, so its effects and safety in people are not established through the kind of trials that support approved medicines.

Is Melanotan II approved or legal?

Melanotan II is not an approved medicine for general use, and its sale for human use is restricted in many countries. Multiple drug regulators have issued safety warnings about products sold through unregulated channels.

Is Melanotan II safe?

Regulators have flagged significant safety concerns. Because it acts non-selectively across melanocortin pathways, effects on moles, blood pressure, and other systems are of concern, and long-term safety in humans is not well characterized.

What are the reported side effects of Melanotan II?

Commonly reported effects include nausea, facial flushing, and darkening of existing moles and freckles. Changes in moles are a particular dermatological concern because they can complicate monitoring for skin cancer.

Is Melanotan II the same as an approved drug?

No. Melanotan II should not be confused with any licensed pharmaceutical. It is not an approved medicine, and material sold on the research or consumer market is unregulated and unverified.

How is Melanotan II different from Melanotan I (afamelanotide)?

They are related but distinct. Melanotan I, known as afamelanotide, is a more receptor-selective molecule that was developed through formal clinical channels for a specific rare condition. Melanotan II is a non-selective melanocortin agonist that was never approved as a medicine and is the one most often flagged by regulators. People frequently confuse the two because the names are so similar, but their regulatory status is very different.

Why did a tanning compound end up linked to a separate 'libido' drug?

During early research, the pigmentation-focused work on Melanotan II unexpectedly showed effects on sexual arousal. That observation led scientists to develop a separate, distinct compound (bremelanotide, also called PT-141) targeting that pathway. This is a common misconception to untangle: the two are related in origin but are not the same substance, and this page is not about that other compound.

Why is Melanotan II so frequently mentioned in regulator warnings compared to other peptides?

Because it was marketed directly to consumers as an injectable cosmetic tanning product rather than staying within research settings, it drew unusual attention from public-health agencies. Its non-selective action affects several body systems at once, and reported effects on existing moles are a particular concern given the link between pigmented lesions and skin monitoring. That combination of consumer-facing sale and system-wide activity is why it appears in safety notices more than many lab-only peptides.

Where can I buy Melanotan II and compare vendors?

Use the vendor comparison on this page. It shows only checked, product-specific links and identifies vendor claims, independent documentation and affiliate relationships separately. Availability and legal status can vary by country.

Pigmentation

Buy Melanotan II – Vendors, Prices, Testing and Evidence

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Also known as: MT-2

Evidence grade C — Early / PreclinicalRisk flag

Short answer

A non-selective melanocortin agonist widely flagged by regulators for safety concerns.

Where can you buy Melanotan II?

Crystal Peptides. The table lists only product-specific offers that were checked and for which a real destination exists. Missing prices, quantities, stock and laboratory details are not inferred.

What is known?

Melanotan II is a synthetic melanocortin agonist affecting pigmentation and other pathways.

What is not established?

No approval; multiple regulator safety warnings exist.

Safety

Regulators have issued safety warnings. Effects on moles, blood pressure, and other systems are of concern.

Regulatory status

Not an approved medicine. Sale for human use is restricted in many countries.

Not medical advice. This educational reference is not diagnosis, treatment, prescribing, dosing or emergency guidance. Consult a qualified professional before making health-related decisions.

Regulatory or safety concern: This substance may be unapproved for human use, affect the hormonal system, or be subject to regulator or anti-doping restrictions. Check the cited evidence and rules in your jurisdiction.

Vendor comparison

Buy Melanotan II: compare vendors

The table lists only product-specific offers that were checked and for which a real destination exists. Missing prices, quantities, stock and laboratory details are not inferred.

Vendor	Product	Documentation	Shipping	Checked	Action
Crystal Peptides Code PEPTIDES10 −10% · discount code details Sponsored	Melanotan II research product	Vendor-supplied data COA stated as available Not independently documented	Europe See the localized country store	Jul 18, 2026	View at vendor

Crystal Peptides

Melanotan II research product

Code PEPTIDES10 −10% · discount code details

What is it?

Melanotan II is a synthetic melanocortin agonist affecting pigmentation and other pathways.

Research and evidence

Melanotan II (often abbreviated MT-2) is a synthetic peptide that acts as a non-selective agonist at melanocortin receptors. It was originally developed from research into the natural hormone alpha-melanocyte-stimulating hormone (alpha-MSH), which plays a central role in skin pigmentation. Because it stimulates melanocortin pathways rather than acting on a single receptor subtype, Melanotan II influences several biological systems at once — pigmentation is the most discussed, but melanocortin receptors are also involved in appetite, sexual function, and cardiovascular signaling. On peptides.cx it is catalogued under the Pigmentation category with an evidence grade of C, reflecting how limited and cautionary the human data picture is.

The peptide is studied primarily because of its effect on melanogenesis: melanocortin activation prompts melanocytes to increase melanin production, which is why it attracts research interest around pigmentation and photoprotection. However, most rigorous characterization of these melanocortin effects comes from preclinical (animal and laboratory) models rather than controlled human trials. Melanotan II is not an approved medicine anywhere for general use, and it should not be confused with any licensed pharmaceutical. It is important to distinguish the well-documented receptor pharmacology from the far thinner body of human clinical evidence — the mechanism is understood, but the safety and efficacy of using the compound in people is not established through the kind of trials that support approved drugs.

The honest evidence picture is dominated by safety signals rather than benefits. Multiple national drug regulators have issued public safety warnings about Melanotan II sold through unregulated research and consumer channels, and its sale for human use is restricted in many countries. Documented and frequently reported effects include nausea, facial flushing, and darkening of existing moles and freckles — the last of which is a particular dermatological concern because changes in moles can complicate skin-cancer surveillance. Its non-selective action also raises questions about blood pressure and other systems. peptides.cx presents this entry as an educational reference to help people understand what Melanotan II is, what the science does and does not show, and why regulators treat it with caution — not as medical advice or a recommendation to use it.

Evidence grade: C

No approval; multiple regulator safety warnings exist. Melanocortin effects characterised preclinically.

Human evidence

No approval; multiple regulator safety warnings exist.

Animal and preclinical evidence

Melanocortin effects characterised preclinically.

Proposed mechanisms

Non-selective melanocortin-receptor agonism

Safety concerns and known side effects

Regulators have issued safety warnings. Effects on moles, blood pressure, and other systems are of concern.

Nausea
Flushing
Darkening of moles reported

Regulatory status

Not an approved medicine. Sale for human use is restricted in many countries.

Melanotan II research timeline

1980s
Researchers at the University of Arizona synthesized melanotan peptides while studying analogs of the natural hormone alpha-MSH, aiming for a photoprotective 'sunless tanning' agent.
Early 1990s
Melanotan II was described as a potent, non-selective melanocortin-receptor agonist, distinguishing it from the more receptor-selective melanotan I (afamelanotide).
1990s
Early human research on pigmentation also documented unexpected effects on sexual arousal, which spun off a separate compound (bremelanotide/PT-141) developed for that pathway.
2000s
Despite never gaining approval, melanotan II spread through unregulated online and gym markets as an injectable tanning product, sold as a research chemical.
Late 2000s–2010s
Multiple national regulators — including the UK's MHRA, Australia's TGA and others — issued public safety warnings against buying or using unlicensed melanotan II.
2010s–2020s
Case reports and dermatology literature raised concerns about changes to moles and new pigmented lesions, reinforcing that no medicine approval exists for this compound.

Frequently asked questions about Melanotan II

What is Melanotan II?: Melanotan II (MT-2) is a synthetic peptide that acts as a non-selective agonist at melanocortin receptors. It is derived from research into alpha-melanocyte-stimulating hormone and is studied mainly for its effect on skin pigmentation.
What does research suggest about Melanotan II?: Melanocortin-receptor effects, including stimulation of melanin production, are well characterized in preclinical animal and laboratory studies. Robust human clinical evidence is limited, so its effects and safety in people are not established through the kind of trials that support approved medicines.
Is Melanotan II approved or legal?: Melanotan II is not an approved medicine for general use, and its sale for human use is restricted in many countries. Multiple drug regulators have issued safety warnings about products sold through unregulated channels.
Is Melanotan II safe?: Regulators have flagged significant safety concerns. Because it acts non-selectively across melanocortin pathways, effects on moles, blood pressure, and other systems are of concern, and long-term safety in humans is not well characterized.
What are the reported side effects of Melanotan II?: Commonly reported effects include nausea, facial flushing, and darkening of existing moles and freckles. Changes in moles are a particular dermatological concern because they can complicate monitoring for skin cancer.
Is Melanotan II the same as an approved drug?: No. Melanotan II should not be confused with any licensed pharmaceutical. It is not an approved medicine, and material sold on the research or consumer market is unregulated and unverified.
How is Melanotan II different from Melanotan I (afamelanotide)?: They are related but distinct. Melanotan I, known as afamelanotide, is a more receptor-selective molecule that was developed through formal clinical channels for a specific rare condition. Melanotan II is a non-selective melanocortin agonist that was never approved as a medicine and is the one most often flagged by regulators. People frequently confuse the two because the names are so similar, but their regulatory status is very different.
Why did a tanning compound end up linked to a separate 'libido' drug?: During early research, the pigmentation-focused work on Melanotan II unexpectedly showed effects on sexual arousal. That observation led scientists to develop a separate, distinct compound (bremelanotide, also called PT-141) targeting that pathway. This is a common misconception to untangle: the two are related in origin but are not the same substance, and this page is not about that other compound.
Why is Melanotan II so frequently mentioned in regulator warnings compared to other peptides?: Because it was marketed directly to consumers as an injectable cosmetic tanning product rather than staying within research settings, it drew unusual attention from public-health agencies. Its non-selective action affects several body systems at once, and reported effects on existing moles are a particular concern given the link between pigmented lesions and skin monitoring. That combination of consumer-facing sale and system-wide activity is why it appears in safety notices more than many lab-only peptides.
Where can I buy Melanotan II and compare vendors?: Use the vendor comparison on this page. It shows only checked, product-specific links and identifies vendor claims, independent documentation and affiliate relationships separately. Availability and legal status can vary by country.

Common discussion areas

PigmentationSafety warnings

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Melanotan II vs Melanotan I

Sources

Editorial review and transparency

Written by: peptides.cx Editorial Team
Scientific reviewer: No named medical reviewer is currently assigned
Last editorial review: June 1, 2026
Last vendor check: July 18, 2026
Review method: Source review, claim verification, vendor-data separation and regulatory-context review.
Commercial disclosure and conflicts: Vendor relationships do not determine evidence or safety ratings. No named reviewer conflict is recorded because no named reviewer is assigned.

Editorial policy →Evidence grade →Vendor methodology →

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