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 2026-02-21. Numbers and descriptions here follow the published literature rather than marketing material.
Receptor-binding studies classify melanotan II as a non-selective melanocortin agonist. It interacts with MC1R, MC3R, MC4R and MC5R, with reported affinities in the low nanomolar range and no strong subtype preference. Activation of MC1R on dermal melanocytes shifts pigment synthesis toward eumelanin, the dark polymer deposited in melanosomes and transferred to keratinocytes. Because the same peptide engages MC4R in the hypothalamus, it also appears in animal work on food intake and erectile response, which is why it is discussed in both pigment and metabolic research. Which receptor populations dominate after systemic exposure in humans is not fully established.
Published pharmacokinetic information is limited and comes mainly from small studies rather than registrational trials. Plasma half-life is usually described as short, on the order of tens of minutes, followed by rapid tissue distribution and clearance of the intact peptide. Metabolites and low concentrations of parent compound have been reported in urine, a detail relevant to anti-doping and forensic testing. Whether repeated exposure changes receptor sensitivity or clearance over time remains an open question. Values differ noticeably between analytical assays, so published numbers should be read as approximate rather than definitive.
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 |
|---|---|---|
| Molecular formula | C50H69N15O9 | Cyclic heptapeptide, C-terminally amidated |
| Approximate molecular mass | 1024 Da | Monoisotopic mass of the free peptide |
| Appearance | White to off-white powder | Typically supplied as a lyophilised solid |
| Solubility class | Soluble in water and polar solvents | Also dissolves in neutral aqueous buffer |
| Common synonyms | Melanotan II, MT-II, MT-2 | Described as a melanocortin agonist in early literature |
The peptide acts as a non-selective agonist at melanocortin receptors, showing affinity for MC1R, MC3R, MC4R and MC5R. Activation of MC1R on melanocytes drives the conversion of tyrosine into melanin and shifts production toward the darker eumelanin form. MC4R signalling in the central nervous system is linked to appetite and energy balance, which helps explain why reduced food intake appeared in early human studies. Effects on MC4R and on vascular tone also account for the erectile responses recorded as unexpected findings in those same trials.
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.
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.
Some vitamins have documented acute or chronic toxicity at larger intakes, which is referred to as hypertoxicity. The European Union and the governments of several countries have established tolerable upper intake levels (ULs) for those vitamins which have documented toxicity (see table). The likelihood of consuming too much of any vitamin from food is remote, but excessive intake (vitamin poisoning) from dietary supplements does occur. In 2016, overdose exposure to all formulations of vitamins and multi-vitamin/mineral formulations was reported by 63,931 individuals to the American Association of Poison Control Centers with 72% of these exposures in children under the age of five. In the US, analysis of a national diet and supplement survey reported that about 7% of adult supplement users exceeded the UL for folate and 5% of those older than age 50 years exceeded the UL for vitamin A.
Austin no-showed the Raw after WrestleMania and took a week-long break without the company's consent, citing exhaustion. Austin returned on the April 1 episode of Raw, the first of the new "brand extension" era. The show was centered around which show he would sign with, and he ultimately chose Raw. Austin entered a feud with The Undertaker that resulted in a number-one contender's match for the Undisputed WWF Championship at Backlash on April 21, which Austin lost. In a May interview on WWE's internet program, Byte This!, Austin stunned the company and fans by launching a verbal attack on the direction the company was heading in and slated the creative team for not using him the way he felt they previously did. The WWE rehired Eddie Guerrero for Austin to feud with, while also prepping Austin for a feud with Brock Lesnar. However, Austin balked at the proposition that he lose a King of the Ring qualifying match on Raw to Lesnar, and ultimately walked out of the company. Austin later explained that he thought hot-shotting a rookie made Austin look weak, and airing the match on free television with no build-up did not give Lesnar a proper stage for such a big win over a star of Austin's magnitude. Further fanning the flames among Austin's growing number of detractors was a well-publicized domestic dispute incident between Austin and his wife Debra (see below). After Austin again no-showed the June 10 episode of Raw, his storylines were immediately dropped.
=== Identification, theories, and investigation === An unidentified object was reported at the top of the tower on October 8, and it became famous. Gould Colman, who had just retired as the university's archivist, stated that the occurrence was "much better than a prank," and "first-rate stuff, the best that I've seen. What a clever accomplishment to get this pumpkin up there." Students placed a collection of pumpkins at the base of the tower, before the university placed an orange fence around the tower with a sign stating "Beware of Falling Pumpkin". A website for the pumpkin was created which was viewed 700,000 times, and featured a dedicated online webcam feed. A student wrote a pumpkin version of the Cornell song. For three weeks, the pumpkin was the subject of a daily feature in The Cornell Daily Sun called "Pumpkin Watch" on its front page, as well as coverage from Associated Press and MTV. While it was largely thought to be a pumpkin, some at the university doubted this assessment, with one assistant professor of horticultural sciences stating that it was too hardy to be of biotic origin. In an effort to definitively identify the object, the university sponsored a contest to identify it without leaving the ground. Physics and engineering students used remote controlled weather balloons, including one with a hypodermic needle to take samples and another with a drill and video cameras, in attempts to identify it. The contest had five entrants, two teams and three individuals.
==== 2024 ==== Researchers demonstrated antibody-mediated depletion of myeloid-biased hematopoietic stem cells against immune system aging with mice. An experiment by researchers at Imperial College London, the MRC London Institute of Medical Sciences, and Duke–NUS Medical School found that reduction in levels of the protein interleukin 11, which increases in the body with age and in excess is responsible for increased inflammation, reversed some aspects of aging in mice. The experiment, which involved genetically engineering some mice to block the production of the protein and allowing others to reach middle age before giving them a drug to eliminate it from their bodies, increased their lifespans by 20–25% and reversed numerous effects of aging. Precious3GPT, an artificial intelligence model designed to assist in aging research and drug discovery, was launched. A study by scientists at Stanford University found that rather than being a solely gradual and linear process, aging accelerates dramatically at two points in a human lifetime. The study, which tracked thousands of different molecules in 108 people aged between 25 and 75, found that age-related changes rise substantially in two waves, with the first occurring at around age 44 and the second at around age 60.
=== Political views === Psychologists in the happiness community feel politics should promote population happiness. Politics should also consider level of human happiness among future generations, concern itself with life expectancy, and focus on the reduction of suffering. Based on political affiliation, some studies argue conservatives, on average, are happier than liberals. A potential explanation is greater acceptance of income inequalities in society leads to a less worried nature. Luke Galen, Associate Professor of Psychology at Grand Valley State University, mentioned political commitments as important because they are a sort of secular world view that, like religion, can be generally beneficial to coping with death anxiety (see also Terror management theory and religion and happiness).
Sources: en.wikipedia.org
=== Synthesis === Cyanuric acid (CYA) was first synthesized by Friedrich Wöhler in 1829 by the thermal decomposition of urea and uric acid. The current industrial route to CYA entails the thermal decomposition of urea, with release of ammonia. The conversion commences at approximately 175 °C (347 °F):
The first of the high-throughput sequencing technologies, massively parallel signature sequencing (or MPSS, also called next generation sequencing), was developed in the 1990s at Lynx Therapeutics, a company founded in 1992 by Sydney Brenner and Sam Eletr. MPSS was a bead-based method that used a complex approach of adapter ligation followed by adapter decoding, reading the sequence in increments of four nucleotides. This method made it susceptible to sequence-specific bias or loss of specific sequences. Because the technology was so complex, MPSS was only performed 'in-house' by Lynx Therapeutics and no DNA sequencing machines were sold to independent laboratories. Lynx Therapeutics merged with Solexa (later acquired by Illumina) in 2004, leading to the development of sequencing-by-synthesis, a simpler approach acquired from Manteia Predictive Medicine, which rendered MPSS obsolete. However, the essential properties of the MPSS output were typical of later high-throughput data types, including hundreds of thousands of short DNA sequences. In the case of MPSS, these were typically used for sequencing cDNA for measurements of gene expression levels.
=== Frontier Capital === While Knoxville's population grew steadily in the early 1800s, most new arrivals were westward-bound migrants staying in the town for a brief period. By 1807, some 200 migrants were passing through the town every day. Cattle drovers, who specialized in driving herds of cattle across the mountains to markets in South Carolina, were also frequent visitors to the city. The city's merchants acquired goods from Baltimore and Philadelphia via wagon trains. French botanist André Michaux visited Knoxville in 1802, and reported the presence of approximately 100 houses and 10 "well-stocked" stores. While there was "brisk commerce" at the city's stores, Michaux noted, the only industries in the city were tanneries and blacksmiths. In February 1804, itinerant Methodist preacher Lorenzo Dow passed through Knoxville, and reported the widespread presence of a religious phenomenon in which worshippers would fall to the ground and go into seizure-like convulsions, or "jerks," at religious rallies. Illinois governor John Reynolds, who studied law in Knoxville, recalled a raucous, anti-British celebration held in the city on July 4, 1812, at the onset of the War of 1812. On October 27, 1815, Knoxville officially incorporated as a city. The city's new charter set up an alderman-mayor form of government, in which a Board of Aldermen was popularly elected, and in turn selected a mayor from one of their own.
Exfoliation is a skincare process that involves the removal of dead skin cells from the skin's surface, promoting skin renewal and cell turnover and rejuvenation. Chemical exfoliating (such as glycolic acid and salicylic acid), causes controlled destruction of the epidermis, leading to subsequent rejuvenation of the skin. Chemical peels are a form of targeted skin exfoliation, with different depths of peels inducing varying degrees of outer layer removal of the skin. Superficial peels, for example, reduce epidermal melanin and are used in the treatment of post-inflammatory hyperpigmentation (PIH). Additionally, exfoliation can be achieved through physical scrubbing using additives such as oats or coffee grounds. Over-exfoliation can lead to irritation and barrier damage, which can be avoided by careful routine design and product choice such as micro-dosed acid formulations.
Sources: en.wikipedia.org
==== Modifying plate size ==== Some studies have suggested that using smaller plates might help people to consume smaller portion sizes. Modifying portion sizes may impact energy intake. Those who are presented with larger portion sizes do not report to have high levels of satiety. In other words, hunger and satiety signals could be ignored with large portion sizes. In a study focused on portion sizes, participants consumed 31% less calories with the small portion sized of a 6-inch submarine sandwich compared with the large portion size of a 12-inch submarine sandwich. Increased portions have occurred simultaneously with the increase in obesity rates. Large portion sizes could be one of the factors contributing to the current increase in average body weight in the US. Evidence from a systematic review of 72 randomized controlled trials indicates that people consistently eat more food when offered larger portion, package, or tableware sizes as opposed to smaller size alternatives.
== Family == The only child of Thorburn Robertson (1851–1932), and Sarah Ann Robertson (1859-?), née Brailsford, Thorburn Brailsford Robertson was born at Edinburgh, Scotland on 4 March 1884. In the early 1890s he migrated to South Australia with his mother to join his father who was attorney for Kangarilla Silver Mines Ltd, and the manager of its copper mine at Callington, near Murray Bridge, South Australia. The Robertsons lived at Callington for a number of years.
== Personal life == Findlay was married to lawyer A. Boyd Ferris, with whom she had two children. After Ferris died from a heart attack in 1989, she met actor Brent Chapman. The two married in 1993 and had two more daughters together; they also have nine grandchildren. Chapman was elected as the provincial MLA for Surrey South in the 2024 British Columbia general election. Findlay is a member of the All-Saints Community Church in White Rock, British Columbia, which is part of the Anglican Mission in the Americas, through its Canadian branch. Findlay's volunteer posts, in addition to the Canadian Bar Association, have included chair of the Vancouver City Planning Commission, board member of Science World, executive member of the Junior Leagues of Canada, president of Delta Zeta chapter of Alpha Gamma Delta International Fraternity, and honorary counsel for the Chinese Benevolent Association of Canada. In 2016, she was named a Distinguished Citizen by Alpha Gamma Delta. In 2001, she declared bankruptcy with more than a half million dollars in debt. She attributed the bankruptcy to a legal battle with the Musqueam First Nation.
A tripeptide is a peptide derived from three amino acids joined by two or sometimes three peptide bonds. As for proteins, the function of peptides is determined by the constituent amino acids and their sequence. In terms of scientific investigations, the dominant tripeptide is glutathione (γ-L-Glutamyl-L-cysteinylglycine), which serves many roles in many forms of life.
Orenetide (INNTooltip International Nonproprietary Name; developmental code name BP101, proposed brand names Libicore and Desirix), also known as Thr-Lys-Pro-Arg-Pro or as so-called "female Viagra", is a synthetic small peptide drug which is under development for the treatment of female sexual dysfunction, or more specifically hypoactive sexual desire disorder (HSDD). It is taken intranasally as a nasal spray. The mechanism of action of orenetide has not been fully elucidated and is unknown. It was inactive at a panel of 98 G protein-coupled receptors (GPCRs), including serotonin, dopamine, and melanocortin receptors, among others. However, at high concentrations in vitro, it inhibited selected GABAA receptors, which may be involved in its effects. Relatedly, it has been labeled in some sources as a "GABAA receptor antagonist". The drug produces pro-sexual effects in rodents, with these effects appearing to be mediated in the medial preoptic area. It is described as a potential first-in-class medication. The drug was originated by Ivix and is under development by Ovoca Bio. As of January 2021, it is in the preregistration phase of development. In August 2023, it was announced that orenetide had failed to show efficacy for sexual desire or sexual distress in a large dose-ranging phase 2 clinical trial for treatment of HSDD. Shares of Ovoca Bio fell by as much as 82% following the announcement. Ovoca Bio is Ireland-based and orenetide has been developed in Australia, New Zealand, and Russia.
Sources: en.wikipedia.org
No. It is a synthetic analogue carrying four amino acid changes, a lactam ring and an amidated C-terminus. The natural hormone is a linear thirteen-amino-acid peptide processed from proopiomelanocortin.
Afamelanotide is the linear analogue [Nle4-D-Phe7]-alpha-MSH, sometimes called melanotan I, while melanotan II is cyclic and carries three further substitutions. The two are distinct molecules and are not interchangeable in analytical testing.
Binding to the four melanocortin receptor subtypes is well documented in vitro. The relative contribution of each subtype to whole-body effects in humans is far less certain.
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.