Melanotan 2 (MT2) · Research brief

Where to Buy Melanotan 2 — Research Supplier Checklist

Real Peptides Research TeamEditorial

Updated December 11, 202510 min read

42 WORDS

Short answer

Most Melanotan 2 purchases go wrong at the listing, not at the bench. Two distinct compounds circulate under the Melanotan name, they differ in sequence, molecular weight and receptor selectivity, and plenty of online storefronts never specify which one they are shipping.

Key takeaways

Melanotan 2 is a cyclic heptapeptide alpha-MSH analogue with CAS 121062-08-6 and an average molecular weight near 1024 g/mol, distinct from the linear 13-residue Melanotan I (afamelanotide).
The deciding factor when you buy Melanotan 2 is whether the certificate of analysis carries a lot number that matches the vial, not the advertised purity percentage.
A certificate showing HPLC purity without mass-spectrometry confirmation verifies cleanliness but never verifies identity.
Labelled vial weight is gross fill weight, including salt counterions and residual moisture, unless net peptide content is separately reported by amino acid analysis or nitrogen determination.
Melanotan 2 holds no FDA approval for any indication, and regulators including the FDA and the MHRA have publicly warned about unlicensed melanotan products sold to consumers online.
Real Peptides supplies Melanotan 2 (MT-2) 10mg as a lyophilized powder for laboratory research, released with a batch-specific certificate of analysis.

Our team supplies research peptides to laboratories, and the same conversation repeats constantly: a researcher has material in hand, no lot-matched paperwork, and no way to confirm identity retroactively. That is a solvable problem, but only before the order goes out.

Where can you buy Melanotan 2 for research?

Researchers buy Melanotan 2 from dedicated research-peptide suppliers that publish lot-matched certificates of analysis showing HPLC purity alongside mass-spectrometry confirmation against a molecular weight near 1024 g/mol. Check CAS 121062-08-6, then confirm the lot number printed on the vial appears on the certificate before ordering.

The common oversimplification is that suppliers compete on purity percentage and price. They don't, really. Almost every listing claims 98% or higher, which makes the claim close to meaningless as a differentiator, so the variable that actually separates suppliers is whether the documentation can be traced back to the specific batch in your hands. What follows covers the three supplier categories, how to read a certificate properly, the identity checks that catch the Melanotan I mix-up, and the handling details that decide whether material arrives intact.

The three places research-grade Melanotan 2 actually comes from

Every source you can buy Melanotan 2 from falls into one of three categories, and they are not close substitutes. The first is a dedicated research-peptide supplier: defined synthesis and QC, a lot number printed on each vial, and a certificate of analysis published for that lot. The second is the bulk reseller, typically an overseas marketplace listing or a drop-ship storefront, where the compound may well be genuine but the paperwork is generic and the batch is untraceable. The third is the consumer tanning market, where melanotan products are pushed at individuals as tanning injections or nasal sprays.

That third category is the one regulators have gone after. Agencies including the U.S. FDA and the UK's MHRA have issued public warnings about unlicensed melanotan products sold online to the public. Melanotan 2 holds no FDA approval for any indication and is not a drug product. No legitimate supplier will describe it as anything other than a compound for laboratory research.

Real Peptides sits squarely in the first category. We supply Melanotan 2 (MT-2) 10mg as a lyophilized powder for research use only, produced through small-batch synthesis with exact amino-acid sequencing and released with a certificate of analysis tied to the batch. Our team has repeatedly worked with researchers who came looking for documentation after a previous vendor could not produce a certificate for the lot they had actually received. When people ask where to buy Melanotan 2, the real question underneath is which supplier can prove what is in the vial.

How to read a certificate of analysis before you order

A certificate of analysis is only useful if it describes your vial. Three fields decide that: the lot or batch number, the date of analysis, and the analytical methods used. For a cyclic heptapeptide like this one, expect reverse-phase HPLC reporting area purity, plus mass spectrometry confirming observed mass against the theoretical value. A certificate showing purity with no mass confirmation tells you how clean the material is and nothing at all about what it is.

Here is the detail almost nobody checks. Synthetic peptides are isolated as salts, so the solid in the vial includes counterions such as acetate or trifluoroacetate plus residual water and solvent. A 10mg label is gross fill weight unless the certificate separately reports net peptide content, usually determined by amino acid analysis or nitrogen determination. Two vials with identical HPLC purity can therefore contain measurably different quantities of peptide. Asking a supplier which number the label refers to is one of the fastest ways to find out how seriously they take QC, and we've found the answer arrives quickly from real suppliers and slowly from resellers.

One more filter: a single PDF reused across every batch of a product is marketing collateral, not traceability. Before you buy Melanotan 2, request the certificate for the lot currently in stock and compare the lot string against what will be printed on the vial you receive.

Identity checks that catch the Melanotan I mix-up

Melanotan 2 and Melanotan I are different molecules, and conflating them is the single most common sourcing error in this category. Melanotan 2 is a cyclic lactam heptapeptide analogue of alpha-melanocyte-stimulating hormone (alpha-MSH), sequence Ac-Nle-cyclo[Asp-His-D-Phe-Arg-Trp-Lys]-NH2, average molecular weight approximately 1024 g/mol, CAS 121062-08-6. It behaves as a non-selective melanocortin receptor agonist with activity reported across MC1R, MC3R, MC4R and MC5R. Melanotan I, also called afamelanotide or NDP-alpha-MSH, is a linear 13-residue analogue with a substantially higher molecular weight and far greater MC1R selectivity, carrying its own distinct CAS number.

That selectivity difference is why the two are not interchangeable in study design. The literature describes MC1R agonism initiating a Gs-coupled cascade: adenylyl cyclase activation, elevated cAMP, protein kinase A signalling, CREB phosphorylation and upregulation of MITF, which in turn drives tyrosinase expression and eumelanin synthesis in melanocytes. Research also links the MC3R and MC4R arms to central effects unrelated to pigmentation, which is why a non-selective agonist produces a broader readout than an MC1R-selective one.

So when you buy Melanotan 2 rather than its linear cousin, the CAS number, the stated sequence and the observed mass on the certificate should all agree before the order is placed. Verify all three. A listing that names only 'Melanotan' with no numeral, no CAS and no sequence has told you nothing verifiable.

Cold chain, packaging, and what should arrive in the box

Lyophilized peptide should arrive as a dry, intact cake or fine uniform powder in a sealed glass vial with an undisturbed crimp seal and a printed lot number. Loose drifting powder, a collapsed sticky residue, or visible moisture inside the vial all point to seal failure or moisture ingress during transit, and no amount of purity documentation compensates for material that arrived compromised.

Standard laboratory practice for long-term storage of lyophilized peptides is freezer storage, protected from light and humidity, with the vial brought to room temperature before opening to prevent condensation on cold glass. Peptides in solution are markedly less stable than the dry solid, which is why research inventories are held lyophilized and refrigerated storage at 2 to 8 degrees Celsius applies only after reconstitution. Any supplier shipping a pre-mixed solution of unknown age, with no reconstitution date and no lot on the label, has removed your ability to assess stability entirely.

Practical shipping checks matter too. Domestic dispatch shortens transit and reduces the number of temperature excursions a package sees, and shipment tracking plus a stated policy for damaged arrivals tells you whether the supplier expects to stand behind the shipment. In our experience, the researchers who have the fewest problems are the ones who photograph the vial and the lot number on arrival, before anything is opened. The information here is educational and describes laboratory handling of research materials only; all compounds discussed are research use only and are not for human or veterinary use.

Where to Buy Melanotan 2: Supplier Type Comparison

This table compares what each supplier category realistically provides, because the decision to buy Melanotan 2 is a documentation decision more than a price decision. Identity risk is the column most buyers underweight.

Source Type	Documentation You Typically Receive	Identity and Quality Risk	Bottom Line
Dedicated research-peptide supplier	Lot-matched certificate of analysis with HPLC purity and MS confirmation, lot printed on the vial, published COA library	Lowest, because identity and batch can be verified independently before and after delivery	The only category where a claim can actually be checked against a physical vial; appropriate for any work that will be written up
Overseas bulk reseller or marketplace listing	Generic certificate, often undated, frequently reused across all batches of the product	Moderate to high; compound may be genuine but batch traceability is absent and counterion or net peptide content is undisclosed	Cheaper per milligram, but you are buying an unverifiable lot; unsuitable where reproducibility matters
Consumer tanning or nasal-spray seller	Marketing copy, no analytical documentation, often no numeral distinguishing Melanotan I from Melanotan 2	Highest; these are the sellers regulators have publicly warned about, and products are marketed for uses the compound has no approval for	Avoid outright; the framing alone signals the supplier is operating outside research supply norms
Forum or social group buy	Screenshots of someone else's certificate, no chain of custody	Highest; no accountable entity, no returns, no way to trace a bad batch	No mechanism exists to verify anything you receive; the saving is not a saving

What If: Melanotan 2 Sourcing Scenarios

What if the listing just says 'Melanotan' with no numeral?

Treat the listing as unidentified material and request the CAS number and full sequence before ordering. Melanotan I and Melanotan 2 differ in sequence length, molecular weight and receptor selectivity, so a supplier that cannot immediately state which one they stock either does not know or does not care. Both failure modes disqualify them for research supply.

What if the certificate of analysis has no lot number on it?

Ask for a lot-specific certificate, and if none exists, cancel the order. A certificate without a lot number cannot be connected to any physical vial, which means it documents a batch that may have been synthesised years earlier by a different manufacturer. This is the most common paperwork gap our team encounters when researchers bring material from a previous vendor.

What if the powder arrives as a loose dust instead of a solid cake?

Photograph the vial before opening and contact the supplier with the lot number. Lyophilized peptide normally presents as an intact cake or uniform fine powder under a sealed stopper; a collapsed, clumped or visibly damp appearance suggests seal failure or moisture ingress, and moisture accelerates degradation in the dry state. Purity data from the point of manufacture does not describe material that arrived compromised.

What if one supplier is dramatically cheaper than everyone else?

Compare net peptide content and documentation before comparing price per milligram. Deep discounts in this category usually reflect one of three things: high counterion and moisture fraction inflating the labelled weight, an untested or repackaged bulk lot, or a listing that is not the compound named. Cheap material with no traceable certificate is an unusable input for any study intended for publication.

The Unglamorous Truth About Buying Peptides Online

Here's the honest answer: the purity figure is the least informative number on almost every page where you can buy Melanotan 2. Nearly all of them say 98% or 99%, the claim is unverifiable without a lot-matched certificate, and area purity by HPLC says nothing about whether the peak being measured is the peptide you ordered. The number that matters is the lot string, because it is the only field connecting a document to a physical vial. Suppliers who publish certificates by lot are making a checkable claim. Everyone else is making a statement of intent.

If you want to inspect how that works in practice, the batch documentation behind our catalog sits in the public certificate of analysis library, alongside the product page for Melanotan 2 (MT-2) 10mg and its linear counterpart Melanotan 1 for researchers comparing receptor selectivity across the two analogues. Common handling and identity questions are collected in the Melanotan 2 FAQ, the wider research catalog is listed in the peptide shop, and shipping details are set out on our location page.

Anyone who sets out to buy Melanotan 2 eventually discovers the same thing: the chemistry is the easy part. Synthesis of a cyclic heptapeptide is well-established, the analytical methods to confirm it are routine, and the compound itself has been characterised in the literature for decades. What is scarce is a supplier willing to attach a specific document to a specific vial and leave it public. That attachment is the entire product. Everything else, the purity claims, the stock photography, the comparison charts, is just a description of material somebody else once made.

References

Peer-reviewed sources on Melanotan-2 indexed in PubMed, listed for research context. Real Peptides supplies Melanotan-2 for laboratory research use only.

Melanotan II: a possible cause of renal infarction: review of the literature and case report. CEN case reports, 2020. PMID 31953620. doi:10.1007/s13730-020-00447-z
Topical MTII Therapy Suppresses Melanoma Through PTEN Upregulation and Cyclooxygenase II Inhibition. International journal of molecular sciences, 2020. PMID 31968661. doi:10.3390/ijms21020681
The effects of the melanocortin agonist (MT-II) on subcutaneous and visceral adipose tissue in rodents. The Journal of pharmacology and experimental therapeutics, 2007. PMID 17567964. doi:10.1124/jpet.107.123091
Assessment of the aversive consequences of acute and chronic administration of the melanocortin agonist, MTII. International journal of obesity and related metabolic disorders : journal of the International Association for the Study of Obesity, 2003. PMID 12704398. doi:10.1038/sj.ijo.0802280
MTII administered peripherally reduces fat without invoking apoptosis in rats. Physiology & behavior, 2003. PMID 12834806. doi:10.1016/s0031-9384(03)00118-5
Exploring the site of anorectic action of peripherally administered synthetic melanocortin peptide MT-II in rats. Brain research, 2003. PMID 12834882. doi:10.1016/s0006-8993(03)02683-0

Questions

Research-grade Melanotan 2 is supplied by dedicated research-peptide vendors that publish batch-specific certificates of analysis rather than by consumer storefronts. Before ordering, confirm the supplier lists CAS 121062-08-6, provides HPLC purity data alongside mass-spectrometry identity confirmation, and prints a lot number on the vial that matches the certificate. Real Peptides supplies Melanotan 2 (MT-2) 10mg as a lyophilized powder for research use only, with a certificate tied to the batch.

Request the certificate of analysis for the lot currently in stock, not a generic product PDF. Check that it names the analytical lab, carries a date, reports reverse-phase HPLC purity, and confirms observed mass against the theoretical value near 1024 g/mol. If the lot number on the certificate does not match the vial that arrives, the document describes a different batch of material.

Melanotan 2 is a cyclic lactam heptapeptide analogue of alpha-MSH with CAS 121062-08-6 and an average molecular weight around 1024 g/mol, and the literature describes it as a non-selective melanocortin receptor agonist active at MC1R, MC3R, MC4R and MC5R. Melanotan 1, also called afamelanotide or NDP-alpha-MSH, is a linear 13-residue analogue with a higher molecular weight and much stronger MC1R selectivity. They are not interchangeable in study design, and they carry different CAS numbers.

Melanotan 2 holds no FDA approval for any indication and is not a drug product. It is supplied in many jurisdictions as a research chemical for laboratory use only, and regulators including the U.S. FDA and the UK's MHRA have issued public warnings about unlicensed melanotan products marketed to consumers. Purchasers are responsible for compliance with the import and possession rules that apply where they are located.

Pricing varies widely by supplier, vial size and documentation standard, so any single figure quoted online is unreliable. The more useful comparison is cost per milligram of net peptide content rather than per labelled vial weight, because labelled weight includes salt counterions and residual moisture unless the certificate states otherwise. Listings priced far below the market usually reflect missing documentation or unverified bulk lots.

At minimum it needs a lot or batch number, a date of analysis, reverse-phase HPLC data reporting area purity, and mass-spectrometry confirmation of the observed molecular mass. Purity data alone confirms only that the material is clean, not that it is the compound named on the label. A certificate reused across every batch of a product provides no traceability at all.

Standard laboratory practice for lyophilized research peptides is freezer storage, protected from light and humidity, with vials equilibrated to room temperature before opening so condensation does not form on cold glass. Peptides in solution are considerably less stable than the dry solid, which is why research inventory is held lyophilized until use. Storage decisions should follow the supplier's stated conditions for the specific batch.

Synthetic peptides are isolated as salts, so the solid includes counterions such as acetate or trifluoroacetate plus residual water and solvent. The labelled figure is gross fill weight unless the certificate separately reports net peptide content, typically determined by amino acid analysis or nitrogen determination. Two vials with identical HPLC purity can contain different actual peptide masses for exactly this reason.

Domestic dispatch generally means shorter transit times, fewer temperature excursions and a clearer route to resolution if a shipment arrives damaged. The larger issue with many overseas marketplace listings is documentation rather than distance: generic or undated certificates make it impossible to connect analytical data to the vial you received. Traceability, not geography, is the variable that should decide the order.

Studies describe Melanotan 2 as a non-selective melanocortin receptor agonist. Research on MC1R signalling reports a Gs-coupled cascade involving adenylyl cyclase activation, raised cAMP, protein kinase A activity, CREB phosphorylation and upregulation of MITF, which drives tyrosinase expression and eumelanin synthesis in melanocytes. Additional activity at MC3R and MC4R is described in the literature as producing effects unrelated to pigmentation. All of this describes laboratory and preclinical research; the compound is supplied for research use only.

Supplier policies differ, and purchasers are responsible for meeting whatever eligibility and compliance requirements apply in their jurisdiction. What does not change is the framing: research-use-only compounds are sold for laboratory research and are never supplied for human or veterinary use. Any seller presenting melanotan products as a tanning product for personal use is operating outside research supply norms.

RESEARCH USE ONLY · NOT EVALUATED BY THE FDA