The short version of regulatory status fits in a sentence. The long version — which is the one that helps — is below.
Reviewed 2026-07-25. Anything still debated is marked as such rather than presented as settled.
Research interest has centred on photoprotection and pigmentation, with a smaller body of work on appetite and sexual function. Published human data remain limited to small, frequently uncontrolled studies, and the compound has never received marketing approval from a national medicines regulator. Most laboratory work treats it as a pharmacological tool for probing melanocortin signalling in cell culture or animal models. Whether pigmentation changes observed in people translate into measurable protection against ultraviolet-induced DNA damage remains an open question.
Melanotan-2 is a synthetic cyclic heptapeptide designed as an analogue of alpha-melanocyte-stimulating hormone, the naturally occurring peptide involved in pigmentation signalling. Its sequence is conventionally written as Ac-Nle-cyclo[Asp-His-D-Phe-Arg-Trp-Lys]-NH2, with a lactam bridge joining the aspartate side chain to the lysine side chain. The empirical formula is C50H69N15O9 and the monoisotopic mass lies near 1023.5 daltons. N-terminal acetylation and the D-configured phenylalanine both increase resistance to enzymatic breakdown compared with the parent hormone.
Pharmacologically, melanotan-2 behaves as a non-selective agonist across the melanocortin receptor family. Binding at MC1R on dermal melanocytes promotes eumelanin synthesis, which underlies the tanning response described in early human work. Activity at the centrally expressed MC4R receptor is associated with reported effects on appetite and erectile function. Because the peptide does not discriminate strongly among receptor subtypes, attributing any single observed effect to one receptor pathway is generally not possible without selective antagonists or receptor knockout models.
Reported observations after unregulated use include shifts in skin pigmentation and, in some accounts, unintended changes to moles and other lesions. Whether these outcomes are causally linked to the compound, and how often they occur, remain open questions because controlled data are scarce. The absence of standardised dosing and verified product purity complicates interpretation. Researchers have called for better surveillance and analytical characterisation of samples obtained outside regulated channels. Conclusions drawn from anecdotal evidence should be treated as provisional.
Melanotan-2 has not received marketing authorisation from major regulatory agencies for any therapeutic indication. Several jurisdictions classify it as a prescription-only medicine or a controlled substance when supplied for human use. Because approved products do not exist, material sold online usually sits outside pharmaceutical supply chains and formal quality oversight. Regulators have issued public notices describing the compound as unapproved. Enforcement varies, and the legal position differs between countries, which complicates any single general statement about its status.
Scientific discussion of Melanotan-2 spans pharmacology, dermatology, and public-health literature. Laboratory studies examine its receptor binding and cellular effects, while clinical reports describe outcomes observed after unregulated use. These two bodies of work differ in rigour and intent. Peer-reviewed trials of the compound as a medicine are limited, so much of the available information comes from case reports and surveillance data. Authors frequently note the gap between experimental findings and real-world use.
| Property | Value | Notes |
|---|---|---|
| Common synonyms | Melanotan II; MT-II; N-acetyl-norleucyl-cyclo[Asp-His-D-Phe-Arg-Trp-Lys] amide | Naming follows peptide convention; the numeral distinguishes it from melanotan-1 |
| Molecular formula | C50H69N15O9 | Includes the lactam bridge; no counter-ion assumed |
| Monoisotopic mass | 1023.53 Da | Free base; salts and counter-ions shift the observed value |
| Appearance | White to off-white lyophilised powder | Batch-to-batch colour variation is not itself proof of impurity |
| Typical analytical method | RP-HPLC purity determination with ESI-MS identity confirmation | Retention time alone does not establish sequence identity |
Two structural changes distinguish the synthetic peptide from the natural hormone. A norleucine residue replaces methionine at one position, and a D-configured phenylalanine replaces the natural L-form at another. Both substitutions slow enzymatic breakdown, which extends the molecule's persistence relative to the parent hormone. The lactam bridge further constrains the backbone into a stable conformation. These features are standard design strategies in peptide chemistry and are not unique to this compound; they appear across many research peptides built for improved stability.
The compound was developed in the late 1980s and early 1990s by academic researchers investigating melanocortin signaling and pigmentation. Early work explored whether synthetic analogs could reproduce effects of the natural hormone under controlled conditions. The molecule never advanced through the full regulatory pathway required for approval as a medicine. From the mid-2000s onward it appeared in unregulated consumer markets, often distributed through informal channels. That gap between research origins and commercial availability shapes how the compound is discussed today.
Melanotan-2 is a synthetic peptide designed as an analog of alpha-melanocyte-stimulating hormone, a signaling molecule produced in the pituitary and skin. Its structure is a linear chain of seven amino acids that folds into a ring through an internal lactam bridge joining two side chains. The compound is sometimes written as MT-II or MEL-2 in informal and commercial contexts. It belongs to the melanocortin peptide family, a group of short signaling molecules that share a conserved core sequence recognized by melanocortin receptors.
Regulatory treatment varies by country. In the United States the peptide is not approved as a medicine, and products offered for human use may be treated as unapproved new drugs; some states also restrict sale. Australia, the United Kingdom, and European Union member states apply comparable restrictions to unapproved peptide products. Border agencies have seized shipments labelled as research chemicals. Classification may change over time, and the legal position for personal importation is not clearly settled in most published guidance.
Lyophilised melanotan-2 is supplied as a solid, which is more stable than a solution. The material is hygroscopic, so weighing is done quickly, in low humidity, with the container kept sealed. Reconstitution usually uses water for injection or bacteriostatic water, added down the wall of the vial to limit foaming. A reconstituted solution is held at 2 to 8 °C and kept away from light. Repeated freezing and thawing of the same vial is avoided because ice crystal formation and concentration effects degrade the peptide.
The compound was developed in the late 1980s and 1990s by academic researchers investigating photoprotection. The rationale held that stimulating melanin production might reduce ultraviolet damage to skin and lower skin cancer risk. Early work examined receptor binding, pigment response, and short-term tolerability in small studies. That program did not produce an approved drug, and formal development stalled after early-phase trials. Whether induced pigmentation confers meaningful photoprotection remains an open question.
Outside regulated medicine, melanotan II circulates through online vendors as a research chemical, often marketed for tanning. Products sold this way vary widely in purity, concentration, and labeling accuracy, and independent testing has documented discrepancies. Published reports describe both pigment effects and adverse reactions, including nausea, flushing, and darkening of existing moles. Long-term safety data are sparse, and no large controlled trial has established a risk profile. Questions about cumulative effects on melanocytes remain unresolved in the literature.
Verification of a purchased sample requires documentation linking a batch to a certificate of analysis, and that document should be read for the methods used rather than the headline purity figure. A single chromatographic percentage does not establish identity. Independent laboratories can perform identity and content assays, but no such test establishes that a product is suitable for human use. Claims about efficacy rest largely on small, early studies rather than on replicated controlled trials, and that gap remains open.
Identity testing for a cyclic peptide of this size usually relies on reversed-phase high-performance liquid chromatography coupled to mass spectrometry. The mass spectrum confirms molecular weight, while the chromatographic trace indicates the proportion of related impurities. Tandem mass spectrometry can provide sequence-level information when fragmentation data are compared against a reference standard. Nuclear magnetic resonance is sometimes used to confirm the lactam bridge, although it requires more material and greater operator expertise than routine chromatographic methods.
As a concession made by Lamartine to popular aspirations, and in exchange for the maintaining of the tricolor flag, he conceded the Republican triptych of Liberté, Égalité, Fraternité, written on the flag, on which a red rosette was also to be added. The first collision took place as to the form which the 1848 Revolution was to take. Lamartine wished for them to maintain their original principles, with the whole country as supreme, whereas the revolutionaries under Ledru-Rollin wished for the Republic of Paris to hold a monopoly on political power. On 5 March the government, under the pressure of the Parisian clubs, decided in favor of an immediate reference to the people, and direct universal suffrage, and adjourned it until 26 April. This added the uneducated masses to the electorate and led to the election of the Constituent Assembly on 4 May 1848. The provisional government having resigned, the republican and anti-socialist majority on 9 May entrusted the supreme power to an Executive Commission consisting of five members: Arago, Pierre Marie de Saint-Georges, Garnier-Pagès, Lamartine, and Ledru-Rollin. The result of the general election, the return of a predominantly moderate, if not monarchical, constituent assembly dashed the hopes of those who had looked for the establishment, by a peaceful revolution, of their ideal socialist state. but they were not prepared to yield without a struggle, and in Paris itself they commanded a formidable force.
The percentage of cases for the Home Nations are shown as follows: 2.66% in England (1 in 40 people), 2.41% in Wales (1 in 40 people), 1.42% in Northern Ireland (1 in 70 people), and 2.59% in Scotland (1 in 40 people). 25 March A special Honours list is announced to recognise those who played a role in the state funeral of Elizabeth II, including the eight pallbearers who carried the Queen's coffin during the ceremony. Reports in The Sun and i newspapers suggest former prime minister Liz Truss, who was in office for 49 days, has submitted a Resignation Honours list. BBC Two airs The MI5 Spy and the IRA: Operation Chiffon, a programme in which journalist Peter Taylor reveals the story of an MI5 spy who helped bring about the Northern Ireland Peace Process after defying government orders not to hold talks with Provisional IRA representatives in 1993. 26 March A ban on the possession of nitrous oxide ("laughing gas"), which is typically purchased in small glass phials, is announced. The government justifies its action as part of a crackdown on anti-social behaviour, going against recommendations from the Advisory Council on the Misuse of Drugs which had recently advised against criminalisation of the gas. The 2023 Boat Race takes place, with Cambridge beating Oxford in both the men's and women's races. 27 March Humza Yousaf succeeds Nicola Sturgeon as Leader of the SNP, after defeating rivals Kate Forbes and Ash Regan in a leadership election.
The first treatments with Adelaide-produced insulin were delivered by Robertson's Medical Science Club colleague, Dr. Trent Champion de Crespigny (Honorary Physician to the Adelaide Children's Hospital). The first treated was gravely-ill 9 years-old Dawson Hanna (1913–1926), at the Adelaide Children's Hospital on 7 January 1923, who lived for another three years. The first adult treated with Adelaide-produced insulin was the comatose and moribund 34 years-old Clifford Harry Cornish (1888–1954), at the Adelaide Hospital on 31 January 1923, who lived for another thirty years. All of the Adelaide-produced insulin used for these treatments had been delivered "free of charge" to the patients.
==== Stunted growth ==== Untreated OSA in children can also lead to stunted growth. When sleep is disrupted in children who are still growing, there can be significant consequences. Human growth hormone (HGH) is secreted during the night, especially during deep, non-REM sleep. If this is disrupted, growth hormone secretion may be compromised; thus, growth may not occur normally, and children may become shorter than their peers.
DNA fragmentation is the separation or breaking of DNA strands into pieces. It can be done intentionally by laboratory personnel or by cells, or can occur spontaneously. Spontaneous or accidental DNA fragmentation is fragmentation that gradually accumulates in a cell. It can be measured by e.g. the comet assay or by the TUNEL assay. Its main units of measurement is the DNA Fragmentation Index (DFI). A DFI of 20% or more significantly reduces the success rates after ICSI. DNA fragmentation was first documented by Williamson in 1970 when he observed discrete oligomeric fragments occurring during cell death in primary neonatal liver cultures. He described the cytoplasmic DNA isolated from mouse liver cells after culture as characterized by DNA fragments with a molecular weight consisting of multiples of 135 kDa. This finding was consistent with the hypothesis that these DNA fragments were a specific degradation product of nuclear DNA.
Sources: en.wikipedia.org
In 1956, Crick and Watson speculated on the structure of small viruses. They suggested that spherical viruses such as Tomato bushy stunt virus had icosahedral symmetry and were made from 60 identical subunits. After his short time in New York, Crick returned to Cambridge where he worked until 1976, at which time he moved to California. Crick engaged in several X-ray diffraction collaborations such as one with Alexander Rich on the structure of collagen. However, Crick was quickly drifting away from continued work related to his expertise in the interpretation of X-ray diffraction patterns of proteins. George Gamow established a group of scientists interested in the role of RNA as an intermediary between DNA as the genetic storage molecule in the nucleus of cells and the synthesis of proteins in the cytoplasm (the RNA Tie Club). It was clear to Crick that there had to be a code by which a short sequence of nucleotides would specify a particular amino acid in a newly synthesised protein. In 1956, Crick wrote an informal paper about the genetic coding problem for the small group of scientists in Gamow's RNA group. In this article, Crick reviewed the evidence supporting the idea that there was a common set of about 20 amino acids used to synthesise proteins. Crick proposed that there was a corresponding set of small "adaptor molecules" that would hydrogen bond to short sequences of a nucleic acid, and also link to one of the amino acids. He also explored the many theoretical possibilities by which short nucleic acid sequences might code for the 20 amino acids.
== Multiplayer mods == Arg! – A pirate-themed deathmatch mod focused on melee combat. PC Zone gave a rating of two out of five. PC PowerPlay wrote: "All new weapons, maps and outstanding pirate features make this a must download." Action Half-Life – A team-based multiplayer mod developed as part of the popular series of "Action"-based mods, designed to emulate the feel of an action movie. Members of the development team had previously worked with developers of Counter-Strike on the mod Action Quake 2. Battle of the Millenium – A superhero-themed class-based deathmatch mod. Six characters are included: Batman, Mega Man, Son Goku, Spawn, Spider-Man, and Superman. In addition of standard weapons, each character has four special powers. Gen4 called the graphics convincing but said the mod is unbalanced since the characters are not equal in power. Blood for Honor – A medieval fantasy deathmatch mod. It includes nine different classes to choose from. .NetGamer called it an interesting mod with an RPG touch. Canned Tuna – Deathmatch mod with five game modes. One of them is called "Gib The Llama" where players are turned into llamas after every odd-numbered respawn. In every game mode players have five weapons with unlimited ammunition (except trip mines). It received a score of three out of five from PC Zone, calling it a weird but incohesive gaming experience. The mod was said to be unpopular with few servers running it. Cold Ice – Features fast-paced gameplay (aided by tools like a jetpack and a grappling hook) and revamps all of the weapons and the color scheme to icy blue.
In molecular biology, the amylin peptide family or calcitonin/CGRP/IAPP peptide family is a family of peptides, which includes the precursors of calcitonin/calcitonin gene-related peptide (CGRP), islet amyloid polypeptide (IAPP) and adrenomedullin. Calcitonin is a 32 amino acid polypeptide hormone that causes a rapid but short-lived drop in the level of calcium and phosphate in the blood, by promoting the incorporation of these ions in the bones, alpha type. Alternative splicing of the gene coding for calcitonin produces a distantly related peptide of 37 amino acids, called calcitonin gene-related peptide (CGRP), beta type. CGRP induces vasodilatation in a variety of vessels, including the coronary, cerebral and systemic vasculature. Its abundance in the CNS also points toward a neurotransmitter or neuromodulator role. Islet amyloid polypeptide (IAPP) (also known as diabetes-associated peptide (DAP), or amylin) is a peptide of 37 amino acids that selectively inhibits insulin-stimulated glucose utilization and glycogen deposition in muscle, while not affecting adipocyte glucose metabolism. Structurally, IAPP is closely related to CGRP. Two conserved cysteines in the N-terminal of these peptides are known to be involved in a disulfide bond. The C-terminal amino acid of all three peptides is amidated.
=== Advantages and disadvantages === A fever response to an infectious disease is generally regarded as protective, whereas fever in non-infections may be maladaptive. Studies have not been consistent on whether treating fever generally worsens or improves mortality risk. Benefits or harms may depend on the type of infection, health status of the patient and other factors. Studies using warm-blooded vertebrates suggest that they recover more rapidly from infections or critical illness due to fever. In sepsis, fever is associated with reduced mortality.
Sources: en.wikipedia.org
== History == This compound was first synthesized by researchers in the Soviet Union in the early 1960s, and was subsequently investigated for glaucoma therapy. It was introduced in European ophthalmology by the late 1960s. In several European countries, it was marketed by Chibret under the trade name Glaucostat. Although not approved in the United States at that time, it was used clinically in other countries as a topical agent to lower intraocular pressure. By the 1970s, it was available under various brand names, including Glaucostat, Glaucotat, Glaunorm, and Glaudin. A combination product with epinephrine was also marketed as Glaucadrine. These formulations were used to manage glaucoma, particularly in cases where miosis facilitates a reduction in intraocular pressure.
Gabe Logan Newell (born November 3, 1962), known by his nickname Gaben, is an American video game developer and businessman who is the co-founder and president of the video game company Valve. Newell was born in Aspen, Colorado, and grew up in Davis, California. He attended Harvard University in the early 1980s but dropped out to join Microsoft, where he helped create the first versions of the Windows operating system. He also led development on a port of the game Doom for Windows 95. In 1996, Newell and Mike Harrington left Microsoft to found Valve and fund the development of their first game, Half-Life (1998). After the success of Half-Life, Harrington sold his stake in Valve to Newell and left in 2000. Newell led development of Valve's digital distribution service, Steam, which launched in 2003 and controlled most of the market for downloaded PC games by 2011. Forbes estimated that Newell owned at least half of Valve as of 2025. He is also the owner of the marine research organization Inkfish, the neuroscience company Starfish Neuroscience, and the custom yacht manufacturer Oceanco. Newell has been estimated as one of the wealthiest people in the United States and the wealthiest person in the video games industry, with an estimated net worth of $11 billion as of 2025.
== Inhibitors == Inhibitors have been designed with the aim of developing analgesic and antihypertensive agents that act by preventing neprilysin's activity against signaling peptides such as enkephalins, substance P, endothelin, and atrial natriuretic peptide. Some are intended to treat heart failure.
=== Bromley High Street === The town has a large retail area, including a pedestrianised High Street and The Glades centre, the main shopping mall, which has a catchment of 1.3 million people. Development at the nearby St. Mark's Square has seen further restaurants and a cinema established. Bromley High Street is also the location for the Bromley Charter Market, which runs on a Tuesday, Thursday and Saturday. King John granted a charter for the Market to be held every Tuesday in 1205, with Henry VI revising this charter to every Thursday in 1447. The Market sells food and confectionery items, clothing and other goods like jewellery.
=== Anti-thyroid drugs === Treatment with methimazole or propylthiouracil for hyperthyroidism, is commonly associated with an elevation of liver enzymes. To differentiate between hyperthyroidism and drug-related liver injury, it is recommended to check baseline liver enzymes prior to initiation of treatment. If liver injury related to anti-thyroid treatment is significant, switching to the alternative agent can be attempted in most cases. Cases of fulminant liver failure reported with propylthiouracil have led to a regulatory warning, and to guidelines recommending methimazole as the first line anti-thyroid agent.
Sources: en.wikipedia.org
It is a synthetic cyclic heptapeptide analogue of alpha-melanocyte-stimulating hormone, containing seven amino acids with a lactam ring and a D-configured phenylalanine residue. It is supplied as a lyophilised powder for laboratory research.
The natural hormone is a linear tridecapeptide that is rapidly degraded in circulation. Melanotan-2 is shortened, cyclised, N-terminally acetylated, and carries a D-amino acid substitution, all of which slow enzymatic breakdown.
No national medicines regulator has approved melanotan-2 for therapeutic or cosmetic use. In several jurisdictions it is treated as an unapproved prescription medicine, and its legal classification differs from country to country.
Major regulatory agencies have not approved it for any indication. Some countries permit it only under prescription frameworks, while others classify it as a controlled substance.