alpha-MSH analogue is one of those subjects where the details matter more than the headlines. This page pulls together the background, the mechanisms, and the practical points readers ask about most.
Updated 2025-08-03. Numbers and descriptions here follow the published literature rather than marketing material.
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.
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.
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.
Melanotan-2 is a synthetic cyclic heptapeptide designed as an analogue of alpha-melanocyte-stimulating hormone, a naturally occurring peptide involved in pigmentation signalling. Its sequence incorporates modified residues that increase potency and extend biological activity relative to the native hormone. The compound binds receptors of the melanocortin family and is examined mainly in laboratory research. It does not occur naturally and exists only as a manufactured chemical entity produced by solid-phase synthesis.
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.
| Property | Value | Notes |
|---|---|---|
| Chemical class | Synthetic cyclic heptapeptide | Analog of alpha-melanocyte-stimulating hormone |
| Primary receptor family | Melanocortin receptors MC1R through MC5R | Binding is not subtype-selective |
| Development period | 1980s | Synthesized during pigmentation and appetite research |
| Regulatory status | Not an approved medicine | No major regulator has authorized human use |
| Related compound | Afamelanotide | Linear analog studied for photoprotection |
In the developed world, about 20% of people are affected by allergic rhinitis, food allergy affects 10% of adults and 8% of children, and about 20% have or have had atopic dermatitis at some point in time. Depending on the country, about 1–18% of people have asthma. Anaphylaxis occurs in between 0.05–2% of people. Rates of many allergic diseases appear to be increasing. The word "allergy" was first used by Clemens von Pirquet in 1906.
The Shrake–Rupley algorithm is a numerical method that draws a mesh of points equidistant from each atom of the molecule and uses the number of these points that are solvent accessible to determine the surface area. The points are drawn at a water molecule's estimated radius beyond the van der Waals radius, which is effectively similar to 'rolling a ball' along the surface. All points are checked against the surface of neighboring atoms to determine whether they are buried or accessible. The number of points accessible is multiplied by the portion of surface area each point represents to calculate the ASA. The choice of the 'probe radius' does have an effect on the observed surface area, as using a smaller probe radius detects more surface details and therefore reports a larger surface. A typical value is 1.4Å, which approximates the radius of a water molecule. Another factor that affects the results is the definition of the VDW radii of the atoms in the molecule under study. For example, the molecule may often lack hydrogen atoms, which are implicit in the structure. The hydrogen atoms may be implicitly included in the atomic radii of the 'heavy' atoms, with a measure called the 'group radii'. In addition, the number of points created on the van der Waals surface of each atom determines another aspect of discretization, where more points provide an increased level of detail.
Nickel-59 is a long-lived cosmogenic radionuclide with a half-life of 81,000 years. 59Ni has found many applications in isotope geology. 59Ni has been used to date the terrestrial age of meteorites and to determine abundances of extraterrestrial dust in ice and sediment.
=== Dosage units === One international unit of insulin (1 IU) is defined as the "biological equivalent" of 34.7 μg pure crystalline insulin. The first definition of a unit of insulin was the amount required to induce hypoglycemia in a rabbit. This was set by James Collip at the University of Toronto in 1922. Of course, this was dependent on the size and diet of the rabbits. The unit of insulin was set by the insulin committee at the University of Toronto. The unit evolved eventually to the old USP insulin unit, where one unit (U) of insulin was set equal to the amount of insulin required to reduce the concentration of blood glucose in a fasting rabbit to 45 m g/d L (2.5 m mol/L). Once the chemical structure and mass of insulin was known, the unit of insulin was defined by the mass of pure crystalline insulin required to obtain the USP unit. The unit of measurement used in insulin therapy is not part of the International System of Units (abbreviated SI) which is the modern form of the metric system. Instead the pharmacological international unit (IU) is defined by the WHO Expert Committee on Biological Standardization.
==== 2014 ==== In March 2014, Novaya Gazeta reported that 1st platoon of the military unit entered South Ossetia from North Ossetia on the night of 7 August 2008 to defend the Roki tunnel. At 4:00 AM on 7 August, one soldier was killed on the firing position after two shots were heard. According to the official version, the cause of death was suicide. However, the soldier's family and comrades' testimonies dispute the official cause of death. In August 2014, Anatoly Khrulyov, the commander of the 58th Army, said in an interview that at 12:03 a.m. on the night of 8 August 2008, he ordered to open the "alarm" packet containing the operational objective of the 58th Army and the plan to reinforce the peacekeepers in South Ossetia prepared in advance before August 2008. Khruloyv said that Russian troops approached the Gupta bridge in South Ossetia in four hours after "the declaration of war" by Georgia and engaged Georgian troops. Khrulyov said that if he had not contacted the General Staff during the war and received new orders, the 58th Army would have taken Tbilisi.
Sources: en.wikipedia.org
==== Wound healing ==== Stem cells can also be used to stimulate the growth of human tissues. In an adult, wounded tissue is most often replaced by scar tissue, which is characterized in the skin by disorganized collagen structure, loss of hair follicles and irregular vascular structure. In the case of wounded fetal tissue, however, wounded tissue is replaced with normal tissue through the activity of stem cells. A possible method for tissue regeneration in adults is to place adult stem cell "seeds" inside a tissue bed "soil" in a wound bed and allow the stem cells to stimulate differentiation in the tissue bed cells. This method elicits a regenerative response more similar to fetal wound-healing than adult scar tissue formation. As of 2018, researchers were still investigating different aspects of the "soil" tissue that are conducive to regeneration. Because of the general healing capabilities of stem cells, they have gained interest for the treatment of cutaneous wounds, such as in skin cancer. Stem cell therapy has also been investigated for hair follicle regeneration. A clinical case report demonstrated improvement in hair loss following COVID-19 vaccination through combined administration of autologous CD34+ hematopoietic progenitor cell fraction and umbilical cord blood-derived mesenchymal stem cells (UC-MSCs), with progressive recovery of hair density observed over 12 weeks of treatment without significant adverse effects.
=== Prevention === Prevention relies on a farm to plate approach involving the whole supply chain anchored in risk analysis and good hygiene practices. Internationally, the Codex Alimentarius General Principles of Food Hygiene provide the foundation for national food safety systems and industry controls. These guidelines are then implemented through various prerequisite programs and HACCP (Hazard Analysis and Critical Control Point) which identify, monitor, and control hazards at specific steps in production. For consumers and food service businesses, evidence-based guidance involves four key steps: Clean, Separate, Cook, Chill. These techniques reduce cross-contamination and ensure lethal heat treatment and rapid refrigeration. Since supply chains are complex, it is critical to prioritize monitoring high-risk foods, such as minimally processed fresh produce, and modifying controls such as, agricultural water safety, manure management, worker hygiene, and post-harvest sanitation. Overall, strengthening surveillance and rapid information-sharing through a One Health lens by linking human, animal, and environmental data, improves outbreak detection and targeted interventions. This is a priority of the WHO Global Strategy for Food Safety 2022–2030.
On 14 June, Canadian prime minister Carney and British prime minister Starmer held their bilateral meeting in Ottawa. On route to Ottawa, Starmer stated that "Canada is an independent, sovereign country and a much-valued member of the Commonwealth" in the wake of President Trump's threats to annex Canada as the 51st state. Upon arrival, Starmer had dinner with Canadian prime minister Mark Carney at his official residence at Rideau Cottage, later the two watched a National Hockey League game between the Edmonton Oilers and Florida Panthers. They agreed to establish an Economic and Trade Working Group and to deepen the Trade Continuity Agreement, while Carney committed Canada to ratifying the UK's accession to CPTPP. The meeting was the first between two international leaders since Israel's strikes on Iran starting the 2025 Iran–Israel conflict; Starmer began a diplomatic push to try to de-escalate the Middle Eastern crisis.
Keith G. Harding CBE FRCGP FRCP FRCS FLSW is a British physician. Harding graduated from Birmingham University with an MBChB degree in Medicine in 1976. Harding is the Director of TIME Institute (Translation, Innovation, Methodology and Engagement) and Head of the Wound Healing Research Unit in the School of Medicine at Cardiff University. He is Clinical Lead for Wound Healing in the Cardiff & Vale NHS Trust. In September 2013 Harding was appointed Dean of Clinical Innovation at Cardiff University. From 2002 to 2005 he was Head of the Department of Surgery at Cardiff University. He is Editor-in-Chief of the International Wound Journal. Keith Harding is a Past President of the European Tissue Repair Society. He was the first President of the European Pressure Ulcer Advisory Panel, and first Recorder of the European Wound Management Association. Harding was Chair of the International Working Group on Wound Healing in Diabetic Foot Disease in 2003. He was Chair of the Expert Working Group that produced a range of International Consensus Documents from 2004 to 2011. Professor Harding was appointed a Commander of the Order of the British Empire in the 2013 New Year Honours for services to medicine and healthcare. Harding is a Fellow of the Royal College of General Practitioners, a Fellow of the Royal College of Physicians, and a Fellow of the Royal College of Surgeons. In 2014, Professor Harding was elected a Fellow of the Learned Society of Wales.
Sources: en.wikipedia.org
=== Bolesław I the Brave === Mieszko's son, Duke Bolesław I the Brave (r. 992–1025), established a Polish Church structure, pursued territorial conquests and was officially crowned the first king of Poland in 1025, near the end of his life. Bolesław also sought to spread Christianity to parts of eastern Europe that remained pagan, but suffered a setback when his greatest missionary, Adalbert of Prague, was killed in Prussia in 997. During the Congress of Gniezno in the year 1000, Holy Roman Emperor Otto III recognized the Archbishopric of Gniezno, an institution crucial for the continuing existence of the sovereign Polish state. During the reign of Otto's successor, Holy Roman Emperor Henry II, Bolesław fought prolonged wars with the Kingdom of Germany between 1002 and 1018.
Tequila's color ranges from clear to a brownish amber, depending on the aging process and the type of wood used for storage. The white (blanco) version of tequila, also nicknamed "silver", is the product with no aging, or may be aged less than two months. It is the purest form, as little has been done to change it. What is known as gold, joven or oro tequila is usually white tequila with the addition of grain alcohols and caramel color; some higher-end gold tequilas may be a blend of white and reposado. Rested (reposado) tequila is aged for a relatively short time (two months or more), and aged (añejo) tequila for a longer time (a year or more). All aging of tequila is done in wooden containers. The aging process can last three years or more, and can create or enhance flavors and aromas. It generally imparts a golden color.
==== As plaintiff ==== Monster Beverage Corporation has been criticized for its policy of indiscriminately suing companies and/or brands that use the word monster, the letter M, or the word beast in their marketing for trademark infringement, despite such trademarks being generally dissimilar or distinguishable from Monster's. The words monster and beast have existed in the English language since the 13th century, with the Latin letter M tracing back to the 7th century BC. By 2019, the company has initiated over a thousand trademark cases that have been reviewed by the US court system or US Patent and Trademark Office's (USPTO) Trademark Trial and Appeal Board, making them a poster child for "trademark bullying" which the USPTO defines as "a trademark owner that uses its trademark rights to harass and intimidate another business beyond what the law might be reasonably interpreted to allow." Examples of such lawsuits include the 2009 ones against Bevreview.com, a beverage review site that published an unfavorable review of the Monster Energy drink, Rock Art Brewery from Vermont that marketed a beer named "Vermonster", and the aquarium hobbyist site MonsterFishKeepers.com in 2012. The "Vermonster" case was even brought up by Senator Patrick Leahy in a study of problematic trademark litigation tactics. Monster Beverage dropped the lawsuit against the microbrewery due to the adverse publicity the lawsuit generated. In a four year case from 2015 to 2019, Monster sued Maple Leaf Sports & Entertainment (MLSE), the parent of the Toronto Raptors, and the NBA.
Sources: en.wikipedia.org
No regulator in a major market has approved it for human use. It appears in research settings and in products marketed outside pharmacy channels. Legal status for personal possession varies by country.
Afamelanotide is a linear analog that has received approval in some jurisdictions for a specific photoprotection indication. Melanotan II is cyclic and less selective across melanocortin receptors. The two are related but are not interchangeable in regulatory or clinical terms.
A compound that activates several receptor subtypes may produce effects beyond pigmentation. Selectivity influences which tissues respond and shapes the side-effect profile described in reports. Designing subtype-selective analogs is a stated goal of melanocortin research.
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.