Everything below concerns melanotan-2. We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Last reviewed on 2025-11-19. Where a claim depends on a specific study, the study is described rather than over-claimed.
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.
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.
Lyophilised peptide powder is comparatively stable when kept dry, cold and protected from light. Once dissolved, the molecule is exposed to hydrolysis, oxidation and microbial growth, and degradation accelerates at higher temperatures and in alkaline solution. Repeated freeze-thaw cycles concentrate solutes and promote aggregation. Handling guidance for research peptides commonly clusters around freezer temperatures for powder and short refrigerated use for reconstituted solutions, with pH control and sterile technique applied throughout.
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.
| Property | Value | Notes |
|---|---|---|
| Chemical class | Synthetic cyclic heptapeptide | Melanocortin receptor agonist |
| Molecular formula | C50H69N15O9 | Neutral form, mass near 1024.2 g/mol |
| Primary targets | MC1R, MC3R, MC4R, MC5R | Binding is non-selective across subtypes |
| Related compounds | Alpha-MSH, melanotan I, afamelanotide | Structurally or functionally related peptides |
| Common abbreviations | MT-II, MT-2 | Naming in the literature is not uniform |
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.
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.
The peer-reviewed record is dominated by small early-phase studies, case reports and pharmacovigilance summaries rather than large randomised trials. Papers typically examine tanning response, receptor selectivity or patterns of reported adverse events. Many note that participants obtained the peptide outside a clinical setting, which limits verification of composition and administered amount. Reported events vary widely, and causality is frequently unclear because the identity and purity of self-sourced material are unknown. Open questions include whether repeated melanocortin receptor stimulation produces cumulative effects, and how often label claims match actual content.
Identification in laboratories relies on reversed-phase liquid chromatography coupled with tandem mass spectrometry, with product-ion spectra compared against a certified reference standard. High-resolution mass spectrometry supplies accurate mass confirmation, and peptide mapping after enzymatic digestion separates melanotan II from closely related analogues. Quantitation of seized material is complicated by unknown counter-ions and residual trifluoroacetate left from purification. Immunoassays raised against alpha-melanocyte-stimulating hormone can cross-react, so chromatographic confirmation is normally required. Urinary detection windows are short, and reported limits of detection differ substantially between laboratories.
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.
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.
Virtually all infections with rabies resulted in death until two French scientists, Louis Pasteur and Émile Roux, developed the first rabies vaccination in 1885. Nine-year-old Joseph Meister (1876–1940), who had been mauled by a rabid dog, was the first human to receive this vaccine. The treatment started with a subcutaneous injection on 6 July 1885, at 8:00 pm, which was followed with 12 additional doses administered over the following 10 days. The first injection was derived from the spinal cord of an inoculated rabbit which had died of rabies 15 days earlier. All the doses were obtained by attenuation, but later ones were progressively more virulent. After the rabies vaccine created by Louis Pasteur was first introduced in France in 1885, its use soon spread to other countries, including outside of Europe. The vaccine was first used in the United States in 1886. In 1888, France established the Pasteur Institute. During the following decades, several similar specialized rabies prevention centers ("Pasteur Institutes") appeared around the world. By 1909 there were 75 such rabies centers worldwide, including in French Indochina. Victims of animal bites in Siam were already receiving the rabies vaccine as early as 1891, becoming the first patients to receive it in Asia. By the late 19th century, European jurisdictions were regulating rabies treatment by opening their own rabies centers or by directing patients to the nearest centers abroad.
=== Pickering emulsions and foams === Nanocelluloses can stabilize emulsions and foams by a Pickering mechanism, i.e. they adsorb at the oil-water or air-water interface and prevent their energetic unfavorable contact. Nanocelluloses form oil-in-water emulsions with a droplet size in the range of 4-10 μm that are stable for months and can resist high temperatures and changes in pH. Nanocelluloses decrease the oil-water interface tension and their surface charge induces electrostatic repulsion within emulsion droplets. Upon salt-induced charge screening the droplets aggregate but do not undergo coalescence, indicating strong steric stabilization. The emulsion droplets even remain stable in the human stomach and resist gastric lipolysis, thereby delaying lipid absorption and satiation. In contrast to emulsions, native nanocelluloses are generally not suitable for the Pickering stabilization of foams, which is attributed to their primarily hydrophilic surface properties that results in an unfavorable contact angle below 90° (they are preferably wetted by the aqueous phase). Using hydrophobic surface modifications or polymer grafting, the surface hydrophobicity and contact angle of nanocelluloses can be increased, allowing also the Pickering stabilization of foams. By further increasing the surface hydrophobicity, inverse water-in-oil emulsions can be obtained, which denotes a contact angle higher than 90°. It was further demonstrated that nanocelluloses can stabilize water-in-water emulsions in presence of two incompatible water-soluble polymers.
Hedonism about well-being, also called prudential hedonism, holds that pleasure and pain are the only factors of well-being. It states that how well a person's life goes depends entirely on how it feels to live it, expressed as the balance of pleasure over pain. According to this view, a person who experiences frequent joy and contentment has high well-being, whereas someone who is constantly in pain and suffering has low well-being. One view sees pleasure and pain as bodily sensations, like the pleasure of eating delicious food and the pain of injuring a leg. However, hedonists generally take a wider perspective, characterizing pleasure and pain broadly as any experience that feels good or bad. This broader understanding includes the intellectual pleasure of reading an engaging book and the sorrow of losing a loved one. According to quantitative hedonism, the value of each episode of pleasure and pain depends only on its intensity and duration. Qualitative hedonism, an alternative perspective, additionally considers non-quantitative factors, arguing that some pleasures are intrinsically superior to others because of their qualitative character, even if they have the same intensity and duration. One criticism of hedonism acknowledges that some pleasures have value but rejects that this is the case for all of them. According to this view, certain pleasures have no value and may even be bad for a person, such as sadistic pleasures from torturing animals.
Sources: en.wikipedia.org
== Awards and honors == 2019 HUPO Award (Human Proteome Organization) 2004 Elsevier / Spectrochimica Acta Atomic Spectroscopy Award for the most important paper published in Spectrochimica Acta Part B in 2002 (Title: Reaction cells and collision cells for ICP-MS: a tutorial review) in co-authorship with Scott D. Tanner and Dmitry Bandura 2001 Manning Innovation Award, Award of Distinction Dr. Vladimir Baranov, together with Scott D. Tanner, received the Manning Award of Distinction from the Manning Innovation Awards Foundation for the remarkable invention of the ICP-MS Dynamic Reaction Cell (Collision/reaction cell). 1999 Pittcon Editors' Awards Perkin-Elmer Sciex for their ELAN 6100 DRC (Dynamic Reaction Cell) ICP-MS system.
==== Winter ==== Traditionally, the greatest varieties of kimchi were available during the winter. In preparation for the long winter months, many types of kimjang kimchi (김장 김치) were prepared in early winter and stored in the ground in large kimchi pots. Today, many city residents use modern kimchi refrigerators offering precise temperature controls to store kimjang kimchi. November and December are traditionally when people begin to make kimchi; women often gather together in each other's homes to help with winter kimchi preparations. "Baechu kimchi" is made with salted baechu filled with thin strips of radish, parsley, pine nuts, pears, chestnuts, shredded red pepper, manna lichen (Korean: 석이 버섯; RR: seogi beoseot), garlic, and ginger.
The four substrates of this enzyme are 7-methylxanthine, reduced nicotinamide adenine dinucleotide (NADH), oxygen, and a proton. Its products are xanthine, oxidised NAD+, water, and formaldehyde. The enzyme is a non-heme iron protein that is part of the pathway of caffeine degradation in Pseudomonas putida.
Sources: en.wikipedia.org
In the direct-to-video anniversary special Tokusou Sentai Dekaranger: 10 Years After, Kight Reidlich cloned a giant version of Abrella that he kept on Planet Highgord to help him fight the Dekarangers. However, Clone Abrella is killed by Dekaranger Robo piloted by Deka Break. Throughout the series, Abrella pilots the following Kaijuki as part of his schemes:
In June 2020, TikTok users and K-pop fans "claimed to have registered potentially hundreds of thousands of tickets" for Donald Trump's campaign rally in Tulsa, Oklahoma through communication on TikTok, contributing to "rows of empty seats" at the event. Later, in October 2020, an organization called TikTok for Biden was created to support then-presidential candidate Joe Biden. After the election, the organization was renamed to Gen-Z for Change. On 10 August 2020, Emily Jacobssen wrote and sang "Ode to Remy", a song praising the protagonist from Pixar's 2007 computer-animated film Ratatouille. The song rose to popularity when musician Daniel Mertzlufft composed a backing track to the song. In response, began creating a "crowdsourced" project called Ratatouille the Musical. Since Mertzlufft's video, many new elements including costume design, additional songs, and a playbill have been created. On 1 January 2021, a full one-hour virtual presentation of Ratatouille the Musical premiered on TodayTix. It starred Titus Burgess as Remy, Wayne Brady as Django, Adam Lambert as Emile, Kevin Chamberlin as Gusteau, Andrew Barth Feldman as Linguini, Ashley Park as Colette, Priscilla Lopez as Mabel, Mary Testa as Skinner, and André De Shields as Ego. A viral TikTok trend known as "devious licks" involves students vandalizing or stealing school property and posting videos of the action on the platform. The trend has led to increasing school vandalism and subsequent measures taken by some schools to prevent damage. Some students have been arrested for participating in the trend.
Mass media, lawmakers, and Donald Trump raised concerns about Biden's age, including his cognitive state, during and after the 2020 United States presidential election. According to a February 2024 poll, Biden's age and health were major or moderate concerns for 86% of voters generally, up from 76% in 2020. According to another February 2024 poll, most of those who voted for Biden in 2020 believed he was too old to be an effective president; The New York Times noted that these concerns "cut across generations, gender, race and education". Concerns about Biden's age and health increased after a poor performance by Biden during a debate against Trump in June 2024. That performance led a number of commentators and Democratic lawmakers to call for Biden to drop out of the 2024 presidential race. In July 2024, Biden ultimately withdrew from the race while stating that he would continue serving as president until the conclusion of his term.
The Victorian College of the Arts (VCA) is the arts school at the University of Melbourne in Australia. It is part of the university's Faculty of Fine Arts and Music (FFAM). It is located near the Melbourne city centre on the Southbank campus of the university. The VCA Film and Television School was founded in 1991, after it assumed ownership and management of the Swinburne Film and Television School. Courses and training offered at the VCA cover seventeen discipline areas: acting and theatre, composition, creative arts and music therapy, dance, design and production, ethnomusicology, film and television, Indigenous arts and culture, interactive composition, jazz and improvisation, music performance, music psychology, music theatre, musicology, performance teaching, visual art, and writing. The VCA is also home to the Wilin Centre for Indigenous Arts and Cultural Development. The library on the Southbank campus is known as the Lenton Parr Music, Visual and Performing Arts Library.
Sources: en.wikipedia.org
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.
Activation of MC1R increases pigment synthesis independently of ultraviolet exposure, which is the mechanism usually cited for darkening without sun exposure. Ultraviolet light still influences skin response through separate biological pathways.
Because the peptide binds several melanocortin receptor subtypes, its effects are not confined to pigmentation. This complicates interpretation of both intended and unintended outcomes reported in studies.
Mass spectrometry combined with liquid chromatography provides both molecular weight confirmation and a measure of related impurities. Tandem mass spectrometry adds sequence information. A purity percentage reported without a mass measurement does not confirm what the material is.