A practical reference on melanotan-2: what it is, how it behaves, what the literature reports, and where the honest uncertainties sit.
This page was last updated on 2025-11-18 and is reviewed periodically as new material appears.
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.
Melanocortin receptors comprise five subtypes with distinct tissue distributions and functions. Melanotan-2 is described in the literature as a non-selective agonist that engages several of these subtypes, including MC1R, MC3R, MC4R, and MC5R. MC1R is the subtype most directly linked to melanin production in skin cells. Because the compound is not subtype-selective, its observed effects in experimental settings are generally attributed to activity across multiple receptor pathways rather than to a single target.
Melanotan-2 is a synthetic linear peptide built from seven amino acids arranged in a short chain. Its sequence is commonly written as Ac-Nle-Asp-His-D-Phe-Arg-Trp-Lys-NH2, which includes a modified N-terminus and an amidated C-terminus. The molecule belongs to the melanocortin family and acts as a receptor agonist. Structural features such as the D-phenylalanine residue and the Nle substitution are associated with increased stability against enzymatic degradation relative to the natural parent peptide.
The compound emerged from research programs in the 1980s that examined analogues of alpha-melanocyte-stimulating hormone for pigmentation and photoprotection. Investigators modified the native sequence to extend activity duration and potency. A related analogue, afamelanotide, was developed within the same broad line of inquiry and eventually gained approval in certain jurisdictions for a rare light-sensitivity condition. Melanotan-2 itself did not progress through the same regulatory route and has no approved therapeutic indication.
| 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 |
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 with the sequence Ac-Nle-cyclo[Asp-His-D-Phe-Arg-Trp-Lys]-NH2, corresponding to a molecular formula of C50H69N15O9 and a monoisotopic mass near 1024 daltons. It was designed as a structural analogue of alpha-melanocyte-stimulating hormone, a peptide hormone produced by cleavage of proopiomelanocortin. A lactam bridge between the aspartate and lysine side chains closes the ring, and the C-terminal amide removes a free carboxyl group. Both modifications increase resistance to enzymatic degradation compared with the linear parent hormone. Four substitutions distinguish it from afamelanotide, the linear analogue studied under the name melanotan I.
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.
== Financials == The company has reported total income of Rs.2073.3345 crores during the Financial Year ended March 31, 2023 as compared to Rs.1181.7454 crores during the Financial Year ended March 31, 2022. The company has posted net profit of Rs.120.78 crores for the Financial Year ended March 31, 2023 as against net profit of Rs.49.6759 crores for the Financial Year ended March 31, 2022.
=== Effects of fermentation === The soy carbohydrates in tempeh become more digestible as a result of the fermentation process. In particular, the oligosaccharides associated with flatulence and indigestion are greatly reduced by the Rhizopus culture. In traditional tempeh-making shops, the starter culture often contains bacteria that produce vitamins such as B12 (though it is uncertain whether this B12 is always present and bioavailable). In western countries, it is more common to use a pure culture containing only Rhizopus oligosporus, which makes little B12 and could be missing Citrobacter freundii and Klebsiella pneumoniae, which have been shown to produce significant levels of B12 analogs in tempeh when present. Studies of fortifying tempeh with vitamin B12 through fermentation using microorganisms indicate that lactic acid bacteria and propionic acid bacteria produce vitamin B12.
The cultivation of plants from which psychotropic substances are obtained is not controlled by the Vienna Convention... Neither the crown (fruit, mescal button) of the Peyote cactus nor the roots of the plant Mimosa hostilis nor Psilocybe mushrooms themselves are included in Schedule I, but only their respective principals, mescaline, DMT, and psilocin. In Peru, ayahuasca is legal and formally protected as part of the country's cultural heritage. When ratifying the 1971 Convention on Psychotropic Substances, Peru entered a reservation to exclude Ayahuasca and San Pedro from international control, citing their traditional ritual use by Amazonian peoples (United Nations Treaty Collection, 1971). This position was reinforced on 24 June 2008, when the Instituto Nacional de Cultura declared the traditional knowledge and ceremonial use of Ayahuasca by Indigenous communities as Patrimonio Cultural de la Nación (Cultural Heritage of the Nation). A fax from the Secretary of the International Narcotics Control Board (INCB) to the Netherlands Ministry of Public Health sent in 2001 goes on to state that "Consequently, preparations (e.g. decoctions) made of these plants, including ayahuasca, are not under international control and, therefore, not subject to any of the articles of the 1971 Convention." Despite the INCB's 2001 affirmation that ayahuasca is not subject to drug control by international convention, in its 2010 Annual Report the Board recommended that governments consider controlling (i.e. criminalizing) ayahuasca at the national level.
LH levels are normally low during childhood and in women, high after menopause. Since LH is secreted as pulses, it is necessary to follow its concentration over a sufficient period of time to get proper information about its blood level. During reproductive years, typical levels are between 1 and 20 IU/L. Physiologic high LH levels are seen during the LH surge (v.s.) and typically last 48 hours. In males over 18 years of age, reference ranges have been estimated to be 1.8–8.6 IU/L. LH is measured in international units (IU). When quantifying the amount of LH in a sample in IUs, it is important to know which international standard your lot of LH was calibrated against since they can vary broadly from year to year. For human urinary LH, one IU is defined as 1/189th of an ampule denoted 96/602 and distributed by the NIBSC, corresponding to approximately 0.04656 μg of LH protein for a single IU, but older standard versions are still widely in use.
==== Late 1990s–2004 ==== In the late 1990s and early 2000s, there was a huge explosion in designer drugs being sold over the internet. The term and concept of "research chemicals" was coined by some marketers of designer drugs (in particular, of psychedelic drugs in the tryptamine and phenethylamine family). The idea was that, by selling the chemicals as for "scientific research" rather than human consumption, the intent clause of the U.S. analogue drug laws would be avoided. Nonetheless, the DEA raided multiple suppliers, first JLF Primary Materials, and then multiple vendors (such as RAC Research) several years later in Operation Web Tryp. This process was accelerated greatly when vendors began advertising via search engines like Google by linking their sites to searches on key words such as chemical names and terms like psychedelic or hallucinogen. Widespread discussion of consumptive use and the sources for the chemicals in public forums also drew the attention of the media and authorities. In 2004, the US Drug Enforcement Administration raided and shut down several Internet-based research chemical vendors in an operation called Web Tryp. With help from the authorities in India and China, two chemical manufacturers were also closed. Many other internet-based vendors promptly stopped doing business, even though their products were still legal throughout much of the world. Most substances that were sold as "research chemicals" in this period of time are hallucinogens and bear a chemical resemblance to drugs such as psilocybin and mescaline.
Sources: en.wikipedia.org
In 1940, private rail lines began building and operating their own reefers, the Railway Express Agency (REA) being by far the largest. In 1948, the REA roster (which would continue to expand into the 1950s) numbered approximately 1,800 cars, many of which were World War II "troop sleepers" modified for express refrigerated transport. By 1965, due to a decline in refrigerated traffic, many express reefers were leased to railroads for use as bulk mail carriers.
=== Turbostratic === Turbostratic graphene exhibits weak interlayer coupling, and the spacing is increased with respect to Bernal-stacked multilayer graphene. Rotational misalignment preserves the 2D electronic structure, as confirmed by Raman spectroscopy. The D peak is very weak, whereas the 2D and G peaks remain prominent. A rather peculiar feature is that the I2D/IG ratio can exceed 10. However, most importantly, the M peak, which originates from AB stacking, is absent, whereas the TS1 and TS2 modes are visible in the Raman spectrum. The material is formed through conversion of non-graphenic carbon into graphenic carbon without providing sufficient energy to allow for the reorganization through annealing of adjacent graphene layers into crystalline graphitic structures.
=== Acute inflammation === When there is a stimulus, the CRP level can increase 10,000-fold from less than 50 μg/L to more than 500 mg/L. Its concentration can increase to 5 mg/L by 6 hours and peak at 48 hours. The plasma half-life of CRP is 19 hours, and is constant in all medical conditions. Therefore, the only factor that affects the blood CRP concentration is its production rate, which increases with inflammation, infection, trauma, necrosis, malignancy, and allergic reactions. Other inflammatory mediators that can increase CRP are TGF beta 1, and tumor necrosis factor alpha. In acute inflammation, CRP can increase as much as 50 to 100 mg/L within 4 to 6 hours in mild to moderate inflammation or an insult such as skin infection, cystitis, or bronchitis. It can double every 8 hours and reaches its peak at 36 to 50 hours following injury or inflammation. CRP between 100 and 500 mg/L is considered highly predictive of inflammation due to bacterial infection. Once inflammation subsides, CRP level falls quickly because of its relatively short half-life.
=== Inlet for liquids === A now well established setup for the controlled evaporation and subsequent analysis of liquids with PTR-MS has been published in 2013 by Fischer et al. As the authors saw the main application of their setup in the calibration of PTR-MS instruments via aqueous standards, they named it "Liquid Calibration Unit (LCU)". The LCU sprays a liquid standard into a gas stream at well-defined flow rates via a purpose-built nebulizer (optimized for reduced probability of clogging and high tolerance to salts in the liquid). The resulting micro-droplets are injected into a heated (> 100 °C) evaporation chamber. This concept offers two main advantages: (i) the evaporation of compounds is enhanced by the enlarged surface area of the droplets and (ii) compounds which are dissociated in water, such as acids (or bases), experience a shift in pH value when the water evaporates from a droplet. This in turn reduces dissociation and supports total evaporation of the compound. The resulting continuous gas flow containing the analytes can be directly introduced into a PTR-MS instrument for analysis.
Sources: en.wikipedia.org
Though eligible to join the EU's Economic and Monetary Union (EMU), Danish voters in a referendum in 2000 rejected exchanging the krone for the euro. Whereas Denmark's neighbours like Norway, Sweden, Poland and the United Kingdom generally follow inflation targeting in their monetary policy, the priority of Denmark's central bank is to maintain exchange rate stability. Consequently, the central bank has no role in a domestic stabilization policy. In an international context, a relatively large proportion of the population is part of the labour force, in particular because the female participation rate is very high. 78.8% of all 15-to-64-year-olds were active in the labour market in 2017, the sixth-highest number among all OECD countries. With a 4.8% unemployment rate, unemployment is relatively low in comparison to other European countries, where the average unemployment rate is 6.7%. The labour market is traditionally characterized by a high degree of union membership rates and collective agreement coverage. Denmark invests heavily in active labor market policies and the concept of flexicurity has been important historically.
== Cause == A diagnosis of iron-deficiency anemia requires further investigation into its cause. It can be caused by increased iron demand, increased iron loss, or decreased iron intake. Increased iron demand often occurs during periods of growth, such as in children and pregnant women. For example, during stages of rapid growth, babies and adolescents may outpace their dietary intake of iron, which can result in deficiency in the absence of disease or a grossly abnormal diet. Iron loss is typically from blood loss. One example of blood loss is by chronic gastrointestinal blood loss, which could be linked to a possible cancer. In women of childbearing age, heavy menstrual periods can be a source of blood loss, causing iron-deficiency anemia. People who do not consume much iron in their diet, such as vegans or vegetarians, are also at increased risk of developing iron deficiency anemia.
In this way, Project Gemini built up spaceflight experience for the pool of astronauts for the Apollo lunar missions. With the completion of Gemini, the US had demonstrated many of the key technologies necessary to make Kennedy's goal of landing a man on the Moon, namely crewed spacecraft docking, with the exception of developing a large enough launch vehicle.
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. Melanotan-2 is manufactured synthetically. The naturally occurring peptide in the same family is alpha-melanocyte-stimulating hormone, which the body produces as part of normal endocrine and neural signalling.