Everything below concerns Alpha-MSH. We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Updated 2026-06-11. Numbers and descriptions here follow the published literature rather than marketing material.
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.
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.
Handling guidance for melanotan II follows general practice for small synthetic peptides rather than a product-specific monograph. Lyophilized powder is typically kept at minus twenty degrees Celsius or colder, protected from light and moisture, because warmth and humidity accelerate degradation. Once reconstituted, solutions are usually refrigerated and used within a short window, as hydrolysis and microbial growth both become concerns. Repeated freeze-thaw cycles are generally avoided. These conventions come from laboratory peptide chemistry and not from formal stability studies on this specific compound.
Analytical confirmation of identity relies on mass spectrometry, most often coupled to liquid chromatography. Reversed-phase high-performance liquid chromatography separates the peptide from related impurities and provides a purity estimate based on peak area. Electrospray ionization mass spectrometry then confirms the expected molecular mass, while tandem mass spectrometry can map the fragment sequence. For research-grade material, these two techniques together form the standard minimum. Purity figures reported by vendors are frequently not traceable to an independent laboratory.
Independent verification is central to quality control because the compound is not produced under pharmaceutical manufacturing standards. Third-party laboratories can measure purity, identity, residual solvents, and microbial contamination, though the scope of testing varies between services. Reported analyses of vendor samples have shown batch-to-batch variation in peptide content and the presence of truncated or oxidized species. How much of this variation reflects synthesis conditions versus storage and shipping is not well characterized. No harmonized reference standard exists for the material as sold.
| Property | Value | Notes |
|---|---|---|
| Chemical class | Synthetic cyclic heptapeptide | Analogue of alpha-melanocyte-stimulating hormone |
| Common synonyms | MT-II; melanotan 2 | No internationally accepted non-proprietary name |
| Typical presentation | Lyophilised powder in a sealed vial | Often supplied alongside a separate diluent |
| Regulatory status | Unapproved therapeutic substance | Customs seizure reported in several jurisdictions |
| Reported route in use | Subcutaneous injection | Self-administered outside clinical settings |
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.
Lyophilized peptide powder is generally stored frozen, protected from light and moisture. Tryptophan residues are susceptible to oxidation, and the lactam bridge can hydrolyze under strongly acidic or basic conditions. Solutions prepared for laboratory work degrade faster than dry powder, and repeated freeze-thaw cycles accelerate loss. Common practice is to aliquot solutions before freezing and to avoid alkaline buffers. Reported stability windows vary with concentration, buffer, and temperature, so exact shelf lives are method-specific rather than universal.
Regulatory status differs by country, and in many places supplying the compound for human consumption is unlawful. Vendors frequently label material as intended for research use only, a designation that shifts stated purpose but does not create a legal pathway for personal use. Certificates of analysis accompanying such products vary widely in detail and provenance. Third-party testing exists but is voluntary, and results are rarely linked to a specific lot in a publicly verifiable way.
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.
Two structural changes distinguish the synthetic peptide from the natural hormone. A norleucine residue replaces methionine at one position, and a D-configured phenylalanine replaces the natural L-form at another. Both substitutions slow enzymatic breakdown, which extends the molecule's persistence relative to the parent hormone. The lactam bridge further constrains the backbone into a stable conformation. These features are standard design strategies in peptide chemistry and are not unique to this compound; they appear across many research peptides built for improved stability.
Regulatory treatment varies by country. In the United States, melanotan-2 is not approved for any indication, and products marketed for human use fall outside the approved drug framework. Some other jurisdictions have placed it under prescription controls or listed it as a prohibited or restricted substance. Online listings frequently describe the material as a research chemical, a category that does not carry the same manufacturing and labelling requirements as approved medicines.
Solid peptide material is generally stable when kept cold and dry. Common practice is storage at -20 degrees Celsius or lower, with desiccant and protection from light. Repeated freeze-thaw cycles and exposure to moisture are associated with degradation, aggregation, or loss of material. Once dissolved, stability depends on solvent, concentration, and temperature, and solutions are usually treated as short-lived unless stability data support longer periods. Handling notes typically emphasise minimising time at ambient temperature.
Gone with the Wind itself may have been briefly overtaken by The Ten Commandments (1956), which closed at the end of 1960 with worldwide rentals of $58–60 million compared to Gone with the Wind's $59 million; if it did claim the top spot its tenure there was short-lived, since Gone with the Wind was re-released the following year and increased its earnings to $67 million. Depending on how accurate the estimates are, the 1959 remake of Ben-Hur may also have captured the record from Gone with the Wind: as of the end of 1961 it had earned $47 million worldwide, and by 1963 it was trailing Gone with the Wind by just $2 million with international takings of $65 million, ultimately earning $66 million from its initial release.
== O == octreotide - odorant receptor - olfaction - olfactory receptor neuron - oligopeptide - oncogene - oncogene protein - oncogene proteins V-abl - oncogenic retroviridae protein - open reading frame - opioid receptor - opsin - optical isomerism - organ (anatomy) - organelle - organic chemistry - organic compound - organic nomenclature - organic reaction - organism - osmosis - osteocalcin - outer hair cell - outline of biochemical techniques - ovalbumin - oxidation - oxidation number - oxidation state - oxidative decarboxylation - oxidative phosphorylation - oxygen - oxytocin - oxytocin receptor
=== Off-label drugs === Antipsychotics (non-selective monoamine receptor modulators) (e.g., olanzapine, quetiapine, risperidone) Benzodiazepines (GABAA receptor positive allosteric modulators) (e.g., alprazolam, clonazepam, diazepam, lorazepam) Beta blockers (β-adrenergic receptor antagonists) (e.g., propranolol, sotalol) Cannabinoids (cannabinoid receptor agonists) (e.g., cannabis, THC/dronabinol, nabilone) Lamotrigine (sodium channel blocker, other actions) Monoamine oxidase inhibitors (MAOIs) (e.g., phenelzine) NMDA receptor antagonists (dissociative hallucinogens) (e.g., ketamine, esketamine) Other selective serotonin reuptake inhibitors (SSRIs) (e.g., citalopram, escitalopram, fluoxetine, fluvoxamine) Prazosin (α1-adrenergic receptor antagonist) Serotonin–norepinephrine reuptake inhibitors (SNRIs) (e.g., desvenlafaxine, duloxetine, milnacipran, venlafaxine) Topiramate (various actions) Tricyclic antidepressants (TCAs) (e.g., imipramine, amitriptyline)
Sources: en.wikipedia.org
The following year a formal statement was issued to the General Assembly which proclaimed that South Africa had no intention of complying with trusteeship, nor was it obligated to release new information or reports pertaining to its administration. Simultaneously, the South West Africa Affairs Administration Act, 1949, was passed by South African parliament. The new legislation gave white South West Africans parliamentary representation and the same political rights as white South Africans. The UN General Assembly responded by deferring to the International Court of Justice (ICJ), which was to issue an advisory opinion on the international status of South West Africa. The ICJ ruled that South West Africa was still being governed as a mandate; hence, South Africa was not legally obligated to surrender it to the UN trusteeship system if it did not recognise the mandate system had lapsed. Conversely, however, it was still bound by the provisions of the original mandate. Adherence to the original mandate meant South Africa could not unilaterally modify the international status of South West Africa. Malan and his government rejected the court's opinion as irrelevant. The UN formed a Committee on South West Africa, which issued its own independent reports regarding the administration and development of that territory. The Committee's reports became increasingly scathing of South African officials when the National Party imposed its harsh system of racial segregation and stratification—apartheid—on South West Africa.
mitochondrial DNA (mtDNA) The set of DNA molecules contained within mitochondria, usually one or more circular plasmids representing a semi-autonomous genome which is physically separate from and functionally independent of the chromosomal DNA in the cell's nucleus. The mitochondrial genome encodes many unique enzymes found only in mitochondria.
Architecture The topic of the origin of Romanian culture began to be discussed by the end of the 18th century among the Transylvanian School scholars. Several writers rose to prominence in the 19th century, including: George Coșbuc, Ioan Slavici, Mihail Kogălniceanu, Vasile Alecsandri, Nicolae Bălcescu, Ion Luca Caragiale, Ion Creangă, and Mihai Eminescu, the later being considered the greatest and most influential Romanian poet, particularly for the poem Luceafărul. In the 20th century, a number of Romanian artists and writers achieved international acclaim, including: Tristan Tzara, Marcel Janco, Mircea Eliade, Nicolae Grigorescu, Marin Preda, Liviu Rebreanu, Eugène Ionesco, Emil Cioran, and Constantin Brâncuși. Brâncuși has a sculptural ensemble in Târgu Jiu, while his sculpture Bird in Space, was auctioned in 2005 for $27.5 million. Romanian-born Holocaust survivor Elie Wiesel received the Nobel Peace Prize in 1986, while Banat Swabian writer Herta Müller received the 2009 Nobel Prize in Literature.
Sources: en.wikipedia.org
== Prognosis == IRIS has a reported mortality rate of 4.5%. Mortality rates vary and depend on the associated OI, degree of immunosuppression, geography, and access to treatment. IRIS affecting the central nervous system has generally been associated with the highest mortality rates (13-75%).
Thy-1 levels in the neonatal rat brain, as well as the developing human brain, are low compared to adult brain. During the first few weeks of postnatal development, Thy-1 levels increase exponentially as the brain matures. Lymphoid tissue Thy-1 expression is highly variable between species. In humans, Thy-1 expression is restricted to only a small population of cortical thymocytes and not expressed in mature human T cells. It is probably the most abundant glycoprotein of murine thymocytes, with about One million copies per cell covering up to 10–20% of the cell surface. Mouse cortical thymocytes express higher levels of Thy-1 than medullary thymocytes which in turn express more than lymph node cells (~200,000 copies/cell). A similar inverse developmental temporal expression profile is seen in rats T cells, although rat Thy-1 is lost at an earlier stage of T cell maturation. Thy-1 is only expressed on thymocytes in rats (contrast to thymocytes and splenocytes in mice). The third intron of the mouse Thy-1 gene has a 36 base pair region that recruits nuclear transcription factors, such as Ets-1-like NF, expressed in thymocytes and splenocytes. The homologous region of the rat gene lacks the Ets-1-like NF binding site, but instead binds another NF expressed in rat thymocytes but not splenocytes.
=== Available forms === Finasteride (brand names Proscar, Propecia) inhibits the function of two of the isoenzymes (types 2 and 3) of 5α-reductase. It decreases circulating DHT levels by up to about 70%. Dutasteride (brand name Avodart) inhibits all three 5α-reductase isoenzymes and can decrease DHT levels by 95%. It can also reduce DHT levels in the prostate by 97 to 99% in men with prostate cancer. Epristeride (brand names Aipuliete, Chuanliu) is marketed in China for the treatment of benign prostatic hyperplasia. However, it can only decrease circulating DHT levels by about 25 to 54%. Alfatradiol (brand names Ell-Cranell Alpha, Pantostin) is a topical 5-ARI used to treat pattern hair loss in Europe.
Church's Texas Chicken menu features a variety of fried chicken options alongside classic sides and desserts. Their menu also includes chicken tenders and boneless wings. Accompanying these main dishes are classic Southern sides such as mashed potatoes with gravy, fried okra, coleslaw, corn on the cob and jalapeño peppers. Desserts include honey butter biscuits and apple pie. Church's Texas Chicken restaurants offer a seasonal seafood menu, featuring shrimp and crispy fish. Since 1952, Church's Texas Chicken restaurants have served beverages supplied by The Coca-Cola Company. In 2008, the companies reaffirmed their commitment with the renewal of their existing contract, continuing to provide customers with Coca-Cola beverages. In 2021, Church's Chicken appointed Performance Food Group Company as its exclusive distributor in the United States to 2026.
Sources: en.wikipedia.org
No. No major regulatory agency has granted a marketing authorisation for melanotan II as a medicine. Products sold under this name are generally presented as laboratory reagents and are not subject to the batch-release testing applied to approved drugs.
It was developed in the 1980s by researchers investigating analogues of alpha-melanocyte-stimulating hormone for pigmentation and related endpoints. Early work included small human studies during the 1990s. Development did not progress to licensing, and the compound remained a research and grey-market item.
Peptides are prone to truncation, oxidation and aggregation during synthesis and handling. Without independent testing, a buyer cannot confirm the identity or the content of a vial. Analytical surveys of unapproved peptide products have repeatedly found discrepancies between label claims and measured composition.
The lyophilized powder is generally held at minus twenty degrees Celsius or below, away from light and moisture. Reconstituted solutions are typically refrigerated and used quickly. These practices derive from general peptide handling rather than a formal stability study.