The short version of Alpha-MSH fits in a sentence. The long version — which is the one that helps — is below.
Reviewed 2026-01-27. Anything still debated is marked as such rather than presented as settled.
Melanotan-2 is frequently confused with afamelanotide, a linear analogue authorised in the European Union for erythropoietic protoporphyria. The two compounds differ in chain length, ring structure and receptor selectivity, so findings for one cannot be transferred directly to the other. Published controlled human data on melanotan-2 remain sparse, and much of what circulates online derives from small studies or unpublished reports. Questions about effect size, dose-response behaviour and long-term safety therefore remain unresolved.
Melanotan-2 is a synthetic cyclic heptapeptide designed as an analogue of alpha-melanocyte-stimulating hormone. Its sequence incorporates a lactam bridge that constrains the peptide into a ring, which increases resistance to enzymatic breakdown relative to the natural hormone. Researchers at the University of Arizona synthesised the compound in the late 1980s and early 1990s while studying pigmentation pathways. It has never received marketing approval from any national medicines regulator. In the scientific literature it is usually described as a laboratory research reagent rather than a therapeutic product.
Receptor binding at MC1R on melanocytes raises intracellular cyclic AMP and increases expression of tyrosinase and related enzymes. The downstream result is greater synthesis of eumelanin, the dark pigment, without ultraviolet exposure acting as the trigger. The compound is not selective, however, and also engages MC3R, MC4R and MC5R, which are expressed in the central nervous system and elsewhere. That lack of selectivity is the explanation usually offered for effects reported outside pigmentation, including appetite suppression and nausea. Selectivity remains a central theme in comparative studies of related peptides.
Human data remain limited and mostly short-term. Reports describe small trials and observational accounts rather than large controlled studies, so questions about dose-response relationships and long-term effects on melanocytes stay open. Whether repeated exposure alters naevus behaviour is not settled in the published record. Researchers also note that self-administered use outside clinical settings makes actual exposure difficult to quantify. Statements about efficacy and safety should therefore be read as preliminary rather than established.
Melanotan II is a synthetic cyclic heptapeptide that acts as an agonist at melanocortin receptors. It was designed as a structural analogue of alpha-melanocyte-stimulating hormone, the endogenous peptide involved in pigment production. The analogue carries a lactam bridge that constrains the ring and slows enzymatic breakdown relative to the native hormone. In research literature it appears under several abbreviations, and naming conventions are not fully standardized. Published descriptions usually place it within the broader melanocortin agonist family.
| Property | Value | Notes |
|---|---|---|
| Chemical class | Synthetic cyclic heptapeptide | Alpha-MSH analogue with a lactam ring |
| Molecular formula | C50H69N15O9 | Commonly cited value for the neutral peptide |
| Molecular weight | 1024.18 g/mol | Calculated for the free molecule |
| Appearance | White to off-white powder | Typically supplied as a lyophilised solid |
| Solubility | Soluble in water, DMSO and ethanol | Dissolution in pure water is often slow |
Published human data come mostly from small, short studies rather than large controlled trials. Reported outcomes include increased skin pigmentation and, in some reports, effects on appetite and libido, but sample sizes are small and follow-up is limited. Whether long-term use produces durable pigment changes or adverse effects is not established. Because products sold outside pharmacies are not standardized, the actual content of any given vial is often unknown. Independent testing of such material is uncommon.
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.
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.
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.
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.
== Martin and Synge and partition chromatography == Chromatography methods changed little after Tsvet's work until the explosion of mid-20th-century research in new techniques, particularly thanks to the work of Archer John Porter Martin and Richard Laurence Millington Synge. By "the marrying of two techniques, that of chromatography and that of countercurrent solvent extraction", Martin and Synge developed partition chromatography to separate chemicals with only slight differences in partition coefficients between two liquid solvents. Martin, who had previously been working in vitamin chemistry (including attempts to purify vitamin E), began collaborating with Synge in 1938, brought his experience with equipment design to Synge's project of separating amino acids. After unsuccessful experiments with complex countercurrent extraction machines and liquid-liquid chromatography methods where the liquids move in opposite directions, Martin hit on the idea of using silica gel in columns to hold water stationary while an organic solvent flows through the column. Martin and Synge demonstrated the potential of the methods by separating amino acids marked in the column by the addition of methyl red. In a series of publications beginning in 1941, they described increasingly powerful methods of separating amino acids and other organic chemicals. In pursuit of better and easier methods of identifying the amino acid constituents of peptides, Martin and Synge also turned to other chromatography media.
This article was submitted to WikiJournal of Medicine for external academic peer review in 2021 (reviewer reports). The updated content was reintegrated into the Wikipedia page under a CC-BY-SA-3.0 license (2021). The version of record as reviewed is: Kholhring Lalchhandama; et al. (2021). "History of penicillin" (PDF). WikiJournal of Medicine. 8 (1): 3. doi:10.15347/wjm/2021.003. Wikidata Q107303937.
Schymanski, Emma L.; Jeon, Junho; Gulde, Rebekka; Fenner, Kathrin; Ruff, Matthias; Singer, Heinz P.; Hollender, Juliane (18 February 2014). "Identifying Small Molecules via High Resolution Mass Spectrometry: Communicating Confidence". Environmental Science & Technology. 48 (4): 2097–2098. Bibcode:2014EnST...48.2097S. doi:10.1021/es5002105. ISSN 0013-936X. PMID 24476540. Schymanski, Emma L.; Singer, Heinz P.; Slobodnik, Jaroslav; Ipolyi, Ildiko M.; Oswald, Peter; Krauss, Martin; Schulze, Tobias; Haglund, Peter; Letzel, Thomas; Grosse, Sylvia; Thomaidis, Nikolaos S. (1 August 2015). "Non-target screening with high-resolution mass spectrometry: critical review using a collaborative trial on water analysis". Analytical and Bioanalytical Chemistry. 407 (21): 6237–6255. doi:10.1007/s00216-015-8681-7. hdl:10234/147867. ISSN 1618-2650. PMID 25976391. S2CID 29696368.
Graphene is chemically dormant, mechanically sturdy, and non-permeable to gas or liquid. So, carbon plays a major role for fabrication of nanomaterials with porous nature. Graphene membranes that are formed by graphene oxide molecules or chemically converted graphene that is adhered with 2D nano mediated arrays have the ability to efficiently separate molecules in a gas or in a liquid phase. Graphene-coated nanomembranes are said to be more applicable in water treatment due to its unique properties. Graphene membranes are obtained from vacuum filtration or coating of graphene oxide solution as Graphene oxide sheets. The graphene coated nanofiltration membrane showed a higher water flux range. The graphene embedded with carbon nanotubes to serve as nanofilters is more useful for dye rejection in water effluent, removal of salt ions, and also acts as antifouling agent. Graphene nanofilter membranes possess effective antifouling agent due to its strong bond between graphene sheets and proteins. Also, graphene oxide coated nanofilter membranes helps in dechlorination of water. In addition to this, ultrathin nanofilter coated with graphene is the most potent filter that could be commercialized for water purification. Graphene oxide membranes can be used in various forms such as free, surface modified, and graphene cast in membranes in the range of micro, nano, or ultrafilters. Among which nanofilters is more efficient for water desalination due to its mechanical strength and physiochemical properties of the membrane.
Sources: en.wikipedia.org
For Charitable Service. Colonel (Rtd) Brian Mark Gorski, MBE. For services to Museums and to the community in Bury, Greater Manchester. Solange Anna-Natasha Urdang. Chief Executive Officer and Founder, The Dang Studios, London, Co-Founder and Director, Black British Theatre Awards and lately Chief Executive Officer, Urdang Academy. For services to Dance and Musical Theatre. Andrew Graham. Deputy Director, Strategic Finance Directorate, Department for Education. For Public Service and to the community in County Durham. Natasha Jane Grant. Deputy Director, Cabinet Office. For Public Service. Edward James Gray. Lately Chair, Antivirals Taskforce. For services to Public Health during Covid-19. Betsy Gregory. For services to Dance. Yvette Mona Griffith. Co-Chief Executive, Jazz re:freshed, Founder Member, GiveBLACK and Founding Trustee, Black Funding Network. For services to Cultural Philanthropy and to Music. Neil Francis Guckian. Chief Executive, The Western Health and Social Care Trust. For services to Health and Social Care and to the community in Northern Ireland. Professor Gavin Halbert. Director, Cancer Research UK Formulation Unit, University of Strathclyde. For services to Cancer Treatment and Research. Professor David Rodney Heath-Brown. Emeritus Fellow, University of Oxford. For services to Mathematics and Mathematical Research. Paul Michael Heygate. Joint Managing Director, Heygate Group. For services to the Food Industry and to Charity. Gordon Arthur Woolnough Hickman. Head of Exotic Disease Policy, Department for Environment, Food and Rural Affairs.
Degradomics is a sub-discipline of biology encompassing all the genomic and proteomic approaches devoted to the study of proteases, their inhibitors, and their substrates on a system-wide scale. This includes the analysis of the protease and protease-substrate repertoires, also called "protease degradomes". The scope of these degradomes can range from cell, tissue, and organism-wide scales.
While significant progress has been made in the sophistication of calorimeters since the review of this subject in 1989, the conclusions reached by the reviewers today are similar to those found in the 1989 review.
The Israel Defense Forces "battle ration" (Manat Krav) is designed to be shared by four soldiers. It contains 1 can of rice filled vine leaves, 8 small cans of tuna, canned olives, a can of sweet corn, a can of pickled cucumbers, 1 can of halva spread and 1 chocolate spread, a can of peanuts, fruit flavored drink powder, and bread or matzoh crackers. There is also an "ambush pack" of candy and high-energy protein bars. In 2008, Israel introduced a new field ration to supplement the traditional Manat Krav. Unlike previous rations, the new Battle Ration consists of individual, self-heating, ready-to-eat meals packed inside plastic-aluminum trays. They are designed to be carried and used by infantry troops for up to 24 hours, until regular supply lines can be established. Ten menus are available, including chicken, turkey and kebab; each meal pack is supplemented with dry salami, dried fruit, tuna, halva, sweet roll, and preserved dinner rolls. However, as of 2012, the older rations were still in use. In 2011, as a result of the manufacturer going bankrupt, the IDF phased out the can of corned beef (known as 'Loof'), which had been part of the battle ration since the nation's founding. It would be replaced by "ground meat with tomato sauce". Many different recipes and different ways of serving the rations have developed in Israel. With the can of tuna, for example, traditionally cooked using toilet paper soaked in oil.
High well-being is associated with frequent positive emotions and infrequent negative ones. Despite their unpleasantness, negative emotions are nonetheless integral to healthy functioning by making people aware of problems and steering behavior away from harmful outcomes. Emotions are closely related to moods, which usually last longer and have a less specific origin and evaluative assessment, such as cheerfulness, serenity, boredom, and depression. Moods typically shape well-being in more subtle ways by coloring perception and motivation over time, often without becoming the primary focus of attention. Life satisfaction is a person's subjective judgment about how well their life is going. As a comprehensive evaluation, it is not limited to one particular domain, like employment or financial status. Instead, it considers all relevant areas of life. Similarly, it is not restricted to how a person currently feels but encompasses a long-term assessment of one's life as a whole across time. For example, a person may be overall satisfied with their life even if they are experiencing intense stomach pain at the moment. Individuals vary in how they arrive at their judgment of life satisfaction. For instance, some rely on instinctive gut feelings while others engage in deliberate and systematic reflections. Sometimes, individuals make inaccurate assessments and deceive themselves about their true quality of life, like cases of false happiness.
Sources: en.wikipedia.org
It is a synthetic cyclic heptapeptide modelled on alpha-melanocyte-stimulating hormone. A lactam bridge links two side chains, forming a ring that stabilises the molecule against proteolysis. It belongs to the broader melanocortin peptide family.
No national medicines agency has approved melanotan-2 for clinical use. Afamelanotide, a related but distinct peptide, holds a marketing authorisation in the European Union for a rare photosensitivity disorder. Melanotan-2 itself is handled as a laboratory chemical.
Its broad activity across melanocortin receptors makes it a tool for probing pigmentation, appetite and vascular signalling. Early trials recorded skin darkening and other effects that were not the original focus of the work. Those observations generated hypotheses that later studies have examined.
It is a synthetic cyclic heptapeptide and a non-selective melanocortin receptor agonist. Structurally it is modelled on alpha-melanocyte-stimulating hormone, a peptide that occurs naturally in the body.