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Not medical advice. The Atlas is not a substitute for a clinician who can examine you.

Alpha-MSH

Alpha-Melanocyte Stimulating Hormone

Evidence grade 1 of 5, Untested. Read how the Atlas grades evidence.

Native alpha-MSH is the endogenous 13-amino-acid melanocortin hormone cleaved from pro-opiomelanocortin. Its anti-inflammatory and melanogenic actions through MC1R are well characterized, but only in animal models and in vitro systems; the 2014 review by Singh and Mukhopadhyay and the 2023 Journal of Translational Medicine review report no human efficacy RCTs of the native peptide itself. Native alpha-MSH has no approved product and is sold only as a research peptide, so the honest grade is 1 (mechanistic and animal-only). The approved and marketed activity belongs to its synthetic analog afamelanotide (Scenesse), which is graded separately.

FDA
No approved product for native alpha-MSH; sold as a research peptide only. The synthetic analog afamelanotide (Scenesse) is FDA-approved (October 2019) for erythropoietic protoporphyria, and the analog bremelanotide (Vyleesi) is FDA-approved for HSDD; these are separate compounds.
WADA
Not specifically named on the WADA Prohibited List; MC1R-agonist tanning analogs are cosmetic rather than performance agents, so native alpha-MSH is not a listed prohibited substance.

Reference only. Not medical advice.

What can go wrong

No approved product and no human efficacy trials for native alpha-MSH; very short half-life limits use, and it is the parent scaffold of higher-risk unregulated analogs (Melanotan I and II) sold as research chemicals.

Talk to a clinician before taking this. The Atlas can tell you what has been studied about Alpha-MSH. It cannot tell you how it would interact with your body, your history, or anything else you are taking, and nothing on this page is a reason to start.

The endogenous 13-amino-acid melanocortin hormone cleaved from pro-opiomelanocortin, with well-characterized MC1R-mediated pigmentation and anti-inflammatory activity in preclinical models; it is the parent scaffold of the approved analog afamelanotide (Scenesse) and of Melanotan and PT-141, while the native peptide itself remains a research peptide with no approved product and no human efficacy trials.

What people take it for

These are the reasons people give for taking it. They are not effects it has been shown to have.

  • Systemic anti-inflammation
  • Melanin production (tanning)

How it is supposed to work

Alpha-MSH (alpha-melanocyte-stimulating hormone) is the natural melanocortin hormone, cut from the POMC precursor, that the synthetic tanning and libido peptides imitate. Through melanocortin receptors it drives skin pigmentation (MC1R), suppresses appetite (MC4R, making it a natural satiety signal) and exerts anti-inflammatory effects. It is the endogenous template behind melanotan and PT-141.

Alpha-MSH is a natural thirteen-amino-acid hormone, cut from the same large precursor protein that produces the stress hormone ACTH. It is the most potent natural pigment-stimulating peptide, and it works through five melanocortin receptors spread across skin, brain and immune cells. Alpha-MSH itself is mostly a research and endogenous hormone, while its tweaked analogs and fragments are the actual drugs and gray-market compounds.

Type
Parent melanocortin hormone
Source
Cut from POMC
Receptors
Five melanocortin
Functions
Skin, appetite, sex, immunity
Role
Source of many analogs
As a drug
Mostly research

One Hormone Behind Tanning, Appetite, Sex, And Inflammation

Alpha-MSH is best understood as the source code behind a whole family of peptides, the natural hormone whose separate functions each became a separate drug or gray-market compound. Through its five receptors it does four very different things. Acting on the skin receptor it drives pigmentation, which is the basis for the tanning peptide melanotan and the approved photoprotection drug afamelanotide. Acting on brain receptors it suppresses appetite and raises energy use, which is the foundation of a class of anti-obesity drugs. Acting on other brain receptors it drives sexual arousal, which is the basis of the approved libido drug bremelanotide. And acting on immune cells it is a powerful natural anti-inflammatory, inhibiting the master inflammatory switch and calming cytokines, an effect distilled into the fragment KPV. Alpha-MSH itself is rarely the product; its pieces and copies are. The honest notes are that the hormone is real and well characterized but mostly a research tool rather than a marketed drug, and that its relationship with melanoma is genuinely complex, since the same pigmentation pathway it drives is entangled with skin-cancer biology in ways that are still being worked out.

Safety in detail

Native alpha-MSH is not approved for human use and has no human efficacy RCTs; safety data come from animal and cell studies. Consumers frequently confuse it with the injectable Melanotan analogs, which carry documented risks including nausea, blood pressure changes, and reports of changing or new pigmented skin lesions.

  • As an endogenous hormone studied mainly in the lab, alpha-MSH itself is not a consumer product, and administered-form safety is not established.
  • Its broad receptor activity means wide-ranging effects, which is why selective analogs were developed instead.
  • Any consumer material would be gray-market and unverified.
  • Not approved as a drug in its native form.

Children and teenagers

Alpha-MSH itself has no pediatric use, being the natural hormone and a research entity, and its analogs are mostly adult drugs with their own considerations. Gray-market melanocortin use is inappropriate for children, and the melanoma and pigmentation concerns apply. There is no appropriate pediatric use.

What people get wrong

Nothing recorded here yet. There is almost certainly something people get wrong about this one, and the blank space means we have not written it down, not that the record is clean.

Who profits, and who pushes back

Nobody is named here yet, because we have not done that work on this entry. Read that as unfinished. Somebody almost certainly sells this, and somebody almost certainly disputes it. Assume both until we have checked.

Alpha-MSH itself is not a major commercial product; it is the natural hormone and a research reagent. The money lives in its derivatives, the approved analogs for photoprotection and libido, the anti-obesity drugs, and the gray-market tanning analog and anti-inflammatory fragment. It is a parent hormone whose children are the products.

How we got here

Alpha-MSH is the natural melanocortin hormone, cleaved from pro-opiomelanocortin (POMC) as the acetylated, amidated N-terminal 13-residue fragment; its structure was established by Harris and colleagues in 1957. Because the native peptide has a very short circulating half-life, drug developers built more stable and more potent analogs: substituting norleucine at position 4 and D-phenylalanine at position 7 gave NDP-MSH, later named afamelanotide (Melanotan I, CUV1647) and commercialized by Clinuvel as Scenesse, which the FDA approved in October 2019 for erythropoietic protoporphyria. A separate cyclic analog line became Melanotan II, the tanning research chemical, from which bremelanotide (PT-141, marketed as Vyleesi for hypoactive sexual desire) was later derived. So the endogenous hormone anchors a large family, but the approved and marketed products are its engineered analogs, not native alpha-MSH itself, which remains a research-only peptide.

Alpha-MSH was characterized as a melanocortin hormone cut from the POMC precursor, and its five receptors were mapped across skin, brain and immune tissue. As its distinct functions were parsed, each spawned a compound: the tanning and photoprotection analogs from its pigmentation arm, the libido drug from its sexual arm, the anti-obesity class from its appetite arm, and the fragment KPV from its anti-inflammatory arm. Alpha-MSH itself remained the well-characterized parent behind them all.

  1. mid-1900sAlpha-MSH is identified as a melanocortin hormone from the POMC precursor.
  2. late 1900sThe five melanocortin receptors and their functions are mapped.
  3. 1990s-2000sIts anti-inflammatory fragment and pigmentation analogs are developed.
  4. 2010s-2020sApproved libido and photoprotection analogs and anti-obesity drugs arrive.
  5. ongoingAlpha-MSH remains the parent hormone behind the cluster.

The numbers behind the grade

Type
Melanocortin hormone
Source
POMC-derived
Drives
Pigment, appetite, anti-inflammation
Analogs
Afamelanotide, PT-141
Approved (native)
No
Use
Research

The people taking it

Important as the natural hormone behind the famous melanocortin peptides, but a research molecule rather than a consumer compound in its own right.

Alpha-MSH itself mainly concerns researchers and a smaller gray-market of tanning and anti-inflammatory users, while its derivatives reach large populations of tanners, libido seekers, gut-health users and obesity patients. The parent hormone is the key to understanding all of those groups at once.

Studied as the endogenous melanocortin hormone underlying pigmentation, appetite and inflammation; its real-world use is through selective analog drugs, not alpha-MSH itself.

Set against the alternatives

Alpha-MSH is the hub, so the useful comparison is to its own offspring. Melanotan is its tanning arm and afamelanotide the approved photoprotection version of the same; bremelanotide is its approved sexual arm; a class of anti-obesity drugs is its appetite arm; and KPV is simply its anti-inflammatory tail. Each is a piece or a tweak of this one hormone aimed at a single function, and understanding alpha-MSH is what explains why that whole shelf of peptides exists. The parent itself is rarely bought; its derivatives are. Its value here is as the map, not the product.

What we do not know

  • Whether alpha-MSH biology yields further drugs beyond the existing selective analogs.
  • How to exploit its anti-inflammatory effects without the pigmentation and appetite ones.
  • What its full physiological role in human appetite and immunity is.

What could change

Receptor-selective drugsNew drugs target a single melanocortin receptor and function.Anti-inflammatory therapeuticsIts immune-calming arm is pursued beyond KPV.Melanoma questionIts protective-versus-permissive role in melanoma is being resolved.Expanding familyThe melanocortin-drug family continues to grow.

The market for this

What follows describes how this is bought and sold. It is not a buying guide and it is not an endorsement of any seller.

There is no approved consumer route. It exists mainly as a research compound; given the limited human data, self-experimentation is not advisable.

Alpha-MSH as a research reagent varies in price, while its derivatives carry their own costs, with the approved drugs expensive and the gray-market analogs moderate.

Not produced as an approved drug for this use; any consumer-facing material is research-use-only, typically synthesized overseas in China, with no quality assurance and frequently no certificate of analysis.

Research reagentAlpha-MSH itself is supplied mainly for laboratory study.Derivatives are the productsIts analogs and fragment carry the real supply chains.Educational hubThe parent is mostly a research and educational entity.

What this entry does not yet cover

What follows is unfinished work on our side, not a finding about Alpha-MSH.

Nothing outstanding on this one.

Sources

The studies that matter

  • Melanocortin biologydecades

    Alpha-MSH is one of the best-characterized hormones in the melanocortin system, central to pigmentation, appetite control and inflammation.

  • Anti-inflammatory research2000s-2010s

    Its anti-inflammatory and immunomodulatory actions have been studied for inflammatory and autoimmune conditions.

  • Therapeutic analogsongoing

    Rather than alpha-MSH itself, engineered analogs (afamelanotide, bremelanotide, setmelanotide) became the actual drugs, targeting specific receptors.