If you have been reading about alpha-MSH analogue and want a single page that covers the useful parts, this is it: definitions, context, how it is studied, and the questions that come up repeatedly.
Updated 2025-08-29. Numbers and descriptions here follow the published literature rather than marketing material.
The peptide was developed during the 1980s by researchers investigating melanocortin signalling and skin pigmentation pathways. Early work focused on analogues of alpha-melanocyte-stimulating hormone that would resist enzymatic breakdown more effectively than the parent molecule. Melanotan-2 emerged from that programme as a shortened, cyclised variant. Reports describing its synthesis and receptor activity later appeared in the scientific literature. Commercial availability grew through unregulated channels rather than through pharmaceutical approval.
Structurally, Melanotan-2 retains the core recognition motif of alpha-melanocyte-stimulating hormone while adding a lactam bridge that links two side chains and constrains the molecule into a ring. This modification lowers susceptibility to enzymatic degradation. The compound acts as an agonist at melanocortin receptors, particularly subtypes associated with melanin production. Because the same receptor family influences several physiological processes, researchers note that its activity is not confined to pigmentation alone. Receptor selectivity continues to be examined in published studies.
Regulatory treatment varies between countries. Several national medicines agencies have classified the peptide as unapproved, and customs authorities in some jurisdictions seize shipments on that basis. A few jurisdictions channel supply through prescription-only frameworks that do not list the substance by name. Because the material circulates mainly through online vendors, composition and purity are rarely verified before sale. Surveys of unapproved peptide products have reported labels that did not match measured content in a substantial fraction of samples.
Melanotan II is a synthetic cyclic heptapeptide analogue of alpha-melanocyte-stimulating hormone, a naturally occurring peptide involved in pigmentation signalling. Its structure substitutes a lactam bridge between side chains to increase stability relative to the native hormone. The compound is also known by the shorthand MT-II and by several non-proprietary synonyms used in research catalogues. It is not an approved therapeutic product in any major jurisdiction; material sold under this name is typically offered as a laboratory reagent rather than as a medicine.
Activity is attributed to agonism at melanocortin receptors, particularly MC1R and MC4R. Activation of MC1R on melanocytes increases melanin synthesis, which underlies the reported tanning effect. MC4R engagement in the central nervous system is linked to appetite suppression and to effects on sexual arousal reported in early clinical studies. Those studies were small and were not designed to establish efficacy or long-term safety. Receptor selectivity among the melanocortin subtypes is not absolute, which complicates attribution of any effect to a single pathway.
| Property | Value | Notes |
|---|---|---|
| Molecular formula | C50H69N15O9 | Synthetic cyclic heptapeptide |
| Molecular mass | Approximately 1024 g/mol | Depends on counter-ion content |
| Appearance | White to off-white powder | Commonly supplied as a lyophilised solid |
| Solubility | Freely soluble in water | Also dissolves in common aqueous buffers |
| Typical storage | -20 degrees Celsius, desiccated | Protect from light and repeated freeze-thaw |
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 II is a synthetic cyclic heptapeptide analog derived from the core sequence of alpha-melanocyte-stimulating hormone. Researchers at the University of Arizona synthesized it during the 1980s while studying pigmentation and appetite signaling. The compound is not an approved medicine in any major jurisdiction and appears mainly in laboratory and research-chemical settings. Its structure incorporates a lactam bridge between side chains, which constrains the ring and slows enzymatic breakdown relative to the natural hormone.
Melanotan II binds several melanocortin receptor subtypes rather than a single target. MC1R on melanocytes drives melanin synthesis, while MC3R and MC4R participate in energy balance, appetite, and sexual response pathways. This lack of selectivity explains why reported effects extend beyond skin darkening. Substitutions at positions four and seven, including norleucine and D-phenylalanine, increase potency and resistance to peptidases. Understanding which receptor mediates which effect remains an active area of investigation.
Comprehensive diet programs, providing counseling and targets for calorie intake, are more efficient than dieting without guidance ("self-help"), although the evidence is very limited. The National Institute for Health and Care Excellence devised a set of essential criteria to be met by commercial weight management organizations to be approved.
ABPP can be analyzed using several complementary detection strategies, each suited to different experimental contexts. These methods generally visualize or enrich the enzyme-probe adduct, enabling qualitative assessment, quantitative comparison, or protein identification by mass spectrometry. One of the earliest and most widely used ABPP workflows employs direct visualization on SDS-PAGE gels. Probes with fluorescent reporter tags (e.g. rhodamine) generate distinct bands corresponding to labeled enzymes, allowing rapid assessment of activity across samples or treatment conditions. This approach is commonly used for broad enzyme families such as serine hydrolases or cysteine proteases and is compatible with high-throughput screening for inhibitors. Because the readout is based on in-gel fluorescence rather than protein abundance, gel-based ABPP readily distinguishes active from inactive enzyme species. However, a significant limitation of gel-based detection is lack of resolving ability, preventing the resolution and identification of low-abundance proteins. In recent years ABPP has been combined with tandem mass spectrometry enabling the identification of hundreds of active enzymes from a single sample. This technique, known as ABPP-MudPIT (multidimensional protein identification technology) is especially useful for profiling inhibitor selectivity as the potency of an inhibitor can be tested against hundreds of targets simultaneously. For proteome-wide analysis, ABPs incorporating affinity tags (e.g.
As a chemist he is known best for his work on organic synthesis, including discovery of the aldol reaction Hans-Joachim Born (1909–1987), German radiochemist who participated in the Soviet nuclear weapons programme Carl Bosch (1872–1940), German chemist, pioneer in the field of high-pressure industrial chemistry. Nobel Prize in Chemistry 1931 Octave Leopold Boudouard (1872–1923), French chemist who discovered the Boudouard reaction: combination of carbon and carbon dioxide to form carbon monoxide at high temperatures Jean-Baptiste Boussingault (1802–1887), French chemist with work in agricultural science, petroleum science and metallurgy
=== Artwork === In 2017, Carrey revealed that he had been painting for the past six years. In 2011, he exhibited the painting Nothing to See Here in an art show in Palm Springs at the Heather James Fine Art Gallery. In 2017, Carrey released a six-minute documentary entitled I Needed Color, which showed him working in his studio. In 2018, Carrey's artwork was displayed at the Outsider Art Fair, leading to discussion as to whether or not a Hollywood actor could qualify as an outsider artist.
==== Germany ==== Various pseudoephedrine-containing products in combination with ibuprofen, aspirin, or antihistamines can be obtained without a prescription upon request at a pharmacy. Common names include Aspirin Complex, Reactine Duo, and RhinoPront. Products containing pseudoephedrine as a single ingredient are not available.
Sources: en.wikipedia.org
By the start of Phase Four, Marvel Studios was no longer contracting actors for a large number of projects, with deal lengths varying for each actor and project. Feige said the studio was looking for actors who were excited to join the franchise and appear in multiple projects without being locked into contractual obligations. He also noted that they were starting to include theme park attractions in actors' deals. By December 2020, because of the impact COVID-19 had on theaters and film studios shifting away from theatrical releases, Marvel Studios began exploring updated contracts for actors, writers, directors, and producers to receive adjusted compensation in the event a film had to debut on Disney+ instead of in theaters. TheWrap reported that the new contracts would likely only apply to films about to enter production. For Marvel Television, Loeb said he and his executives were involved in all aspects of production: "whether it's being in the writers' room, editing, on set, casting—every step of the production goes through the Marvel team to tell the best story that we can". He said the studio was able to work on so many series across different networks and platforms because all they needed was one person working on each series to help "guide the process". When developing the crossover miniseries The Defenders, showrunner Marco Ramirez consulted with the creators of all the individual Marvel Netflix series, having them read each of the scripts for The Defenders and provide insight into individual characters' worlds.
A balloon pops when the material that makes up its surface tears or shreds, creating a hole. Normally, there is a balance of the balloon skin's elastic tension in which every point on the balloon's surface is being pulled by the material surrounding it. However, if a hole is made on the balloon's surface, the force becomes imbalanced, since there is no longer any force exerted by the center of the hole on the material at its edge. As a result, the balloon's surface at the edge of the hole pulls away, making it bigger; the high pressure air can then escape through the hole and the balloon pops. A balloon can be popped by either physical or chemical actions. Limpanuparb et al. use popping a balloon as a demonstration to teach about physical and chemical hazards in laboratory safety.
Single nucleotide polymorphisms (SNPs) play an important role in genome wide association studies because they act as primary biomarkers. SNPs are currently the marker of choice due to their large numbers in virtually all populations of individuals. The location of these biomarkers can be tremendously important in terms of predicting functional significance, genetic mapping and population genetics. Each SNP represents a nucleotide change between two individuals at a defined location. SNPs are the most common genetic variant found in all individual with one SNP every 100–300 bp in some species. Since there is a massive number of SNPs on the genome, there is a clear need to prioritize SNPs according to their potential effect in order to expedite genotyping and analysis.
Thus, within 24 hours (13 half-lives after the injection), the radioactivity in the patient and in any initially voided urine which may have contaminated bedding or objects after the PET exam will have decayed to 2−13 = 1⁄8192 of the initial radioactivity of the dose. In practice, patients who have been injected with [18F]FDG are told to avoid the close vicinity of especially radiation-sensitive persons, such as infants, children and pregnant women, for at least 12 hours (7 half-lives, or decay to 1⁄128 the initial radioactive dose).
Sources: en.wikipedia.org
=== Malaysian and Singaporean === Malays from Malaysia, using the Malay dialect similar to Indonesian, use the word kicap for soy sauce. Kicap is traditionally of two types: kicap lemak (lit "fat/rich soy sauce") and kicap cair. Kicap lemak is similar to Indonesian kecap manis but with very much less sugar, while kicap cair is the Malaysian equivalent of kecap asin.
=== Cold War tensions and the border militarisation === The increasing likelihood of armed conflict in South West Africa had strong international foreign policy implications, for both Western Europe and the Soviet bloc. Prior to the late 1950s, South Africa's defence policy had been influenced by international Cold War politics, including the domino theory and fears of a conventional Soviet military threat to the strategic Cape trade route between the south Atlantic and Indian oceans. Noting that the country had become the world's principal source of uranium, the South African Department of External Affairs reasoned that "on this account alone, therefore, South Africa is bound to be implicated in any war between East and West". Prime Minister Malan took the position that colonial Africa was being directly threatened by the Soviets, or at least by Soviet-backed communist agitation, and this was only likely to increase whatever the result of another European war. Malan promoted an African Pact, similar to NATO, headed by South Africa and the Western colonial powers accordingly. The concept failed due to international opposition to apartheid and suspicion of South African military overtures in the British Commonwealth. South Africa's participation in the Korean War produced a significant warming of relations between Malan and the United States, despite American criticism of apartheid. Until the early 1960s, South African strategic and military support was considered an integral component of U.S.
==== Physical health ==== Meta-analyses published between 2013 and 2017 show that exercise is associated with reductions in depressive symptoms, fatigue and QoL plus improvements in attention, hyperactivity, impulsivity, social functioning, schizophrenic symptoms, and verbal fluency in various special populations. However, aerobic exercise has no significant effect on anxiety disorders. In 2005 a study conducted by Andrew Steptow and Michael Marmot at University College London, found that happiness is related to biological markers that play an important role in health. The researchers aimed to analyze whether there was any association between well-being and three biological markers: heart rate, cortisol levels, and plasma fibrinogen levels. The participants who rated themselves the least happy had cortisol levels that were 48% higher than those who rated themselves as the most happy. The least happy subjects also had a large plasma fibrinogen response to two stress-inducing tasks: the Stroop test, and tracing a star seen in a mirror image. Repeating their studies three years later Steptow and Marmot found that participants who scored high in positive emotion continued to have lower levels of cortisol and fibrinogen, as well as a lower heart rate. In Happy People Live Longer (2011), Bruno Frey reported that happy people live 14% longer, increasing longevity 7.5 to 10 years and Richard Davidson's bestseller (2012) The Emotional Life of Your Brain argues that positive emotion and happiness benefit long-term health.
Sources: en.wikipedia.org
It is a synthetic cyclic heptapeptide and an analogue of alpha-melanocyte-stimulating hormone. The molecule is produced by chemical synthesis rather than extracted from a biological source.
It is shorter than the native hormone and carries a cyclic constraint that improves stability. These changes raise receptor potency and slow breakdown relative to the naturally occurring peptide.
Published accounts date its development to the 1980s, when researchers were generating analogues of melanocyte-stimulating hormone. That work aimed to produce more stable compounds for studying pigmentation biology.
No. No major regulatory agency has granted a marketing authorisation for melanotan II as a medicine. Products sold under this name are generally presented as laboratory reagents and are not subject to the batch-release testing applied to approved drugs.