Melanotan II comes up often in conversation and rarely with the context attached. Here we lay out the basics in order, then work through the practical considerations.
Updated 2025-08-08. 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.
| 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.
== Description == Diabetes is a well known chronic disease that affects many individuals of all ages worldwide. There are many subtypes including Type 1, Type 2, gestational diabetes, maturity-onset diabetes of the young (MODY), neonatal diabetes, with Type 1 and Type 2 being the most common. All types of diabetes should be controlled as uncontrolled diabetes can cause many complications. Blood glucose levels that are too low (hypoglycemia) or too high (hyperglycemia) can cause both acute and chronic problems. Uncontrolled diabetes can harm the inner lining of blood vessels, which affects the ability of blood to deliver nutrients and oxygen to organs throughout the body. By causing damage to blood vessels, diabetes is associated with an increased risk of macrovascular (large blood vessel) conditions such as stroke and heart disease (heart attacks). Diabetes is also associated with microvascular (small blood vessel) complications to organs such as the eyes (diabetic retinopathy) and the kidneys (diabetic nephropathy). In addition to maintaining adequate blood sugar levels in the body, control of other risk factors that contribute to complications such as smoking, alcohol use, excessive weight, high blood pressure, and high cholesterol are also very important. Often, the recommended treatment for diabetes mellitus is a combination of lifestyle changes such as increasing exercise and healthy eating, along with medications to help control the blood glucose levels in the long term.
== F == fat redistribution – FDA FDC – floaters – follicle – follicular dendritic cells (FDCs) – Food and Drug Administration (United States) functional antibody – fungus – fusin – fusion inhibitor – fusion mechanism – fusion peptide
Although most MALS-based measurements are performed in a plane containing a set of detectors usually equidistantly placed from a centrally located sample through which the illuminating beam passes, three-dimensional versions also have been developed wherein the detectors lie on the surface of a sphere with the sample controlled to pass through its center where it intersects the path of the incident light beam passing along a diameter of the sphere. The former framework is used for measuring aerosol particles while the latter was used to examine marine organisms such as phytoplankton. The traditional differential light scattering measurement was virtually identical to the currently used MALS technique. Although the MALS technique generally collects multiplexed data sequentially from the outputs of a set of discrete detectors, the earlier differential light scattering measurement also collected data sequentially as a single detector was moved from one collection angle to the next. The MALS implementation is of course much faster, but the same types of data are collected and are interpreted in the same manner. The two terms thus refer to the same concept. For differential light scattering measurements, the light scattering photometer has a single detector whereas the MALS light scattering photometer generally has a plurality of detectors. Another type of MALS device was developed in 1974 by Salzmann et al. based on a light pattern detector invented by George et al. for Litton Systems Inc. in 1971.
Sources: en.wikipedia.org
October 24, 2008: Iceland Iceland receives a £1.3 billion (US$2.06 billion, €1.63 billion) bailout package from the International Monetary Fund as the first European country to require an emergency loan with the aim of stabilising the collapsed currency and strengthening the tax system as well as the nationalised banks.
By 2016, regeneration had been operationalised and induced by four main techniques: regeneration by instrument; regeneration by materials; regeneration by 3D printing; and regeneration by drugs. By 2016, regeneration by instrument, regeneration by materials and by regeneration drugs had been generally operationalised in vivo (inside living tissues), while regeneration by 3D printing had been generally operationalised in vitro (inside the lab) in order to create and prepare tissue for transplantation.
=== Eye health === Nicotinamide has potential benefit in slowing vision loss and providing protection of eye cells, with the most promising evidence for protecting the retina from normal‑tension glaucoma and optic nerve from other forms of glaucoma. Relevant studies in the scientific literature speculate the mechanism of action to be direct retinal ganglion cell protection, among other indirect pathways in the optical nervous system. Contrary to nicotinamide, niacin has not been found to possess any properties in protecting optical nerve components as of 2026. Current research studies and American Academy of Ophthalmology have suggested a total daily intake of 1000mg, with optimal interval doses of 500mg spread throughout the day in promoting eye health.
Sources: en.wikipedia.org
That Awkward Moment (released as Are We Officially Dating? in Australia, Indonesia, and New Zealand) is a 2014 American bromantic comedy drama film written and directed by Tom Gormican in his directorial debut. The film stars Zac Efron, Miles Teller, Michael B. Jordan, Imogen Poots, Mackenzie Davis, and Jessica Lucas. The film had its Los Angeles premiere on January 27, 2014, and it was widely released on January 31 in the United States.
=== Inducers === Many compounds commonly used in ferroptosis studies including erastin, RSL3 (RAS-selective lethal), ML162, and ML210 [from National Institutes of Health-Molecular Libraries Small Molecule Repository (NIH-MLSMR)] were initially identified in screens for compounds that can selectively kill cancerous mutant RAS cells. Initial studies characterized the mitochondrial VDAC2 and VDAC3 as the targets of erastin, though it was later found that the mechanistic target of erastin is the cystine/glutamate transporter system xc−. Erastin inhibits system xc−, lowering intracellular GSH levels. Consequently, the GSH-dependent GPX4 is unable to detoxify lipid hydroperoxide species, leading to ferroptotic cell death. Derivatives of erastin have been prepared to improve aqueous solubility, potency, and metabolic stability, with imidazole ketone erastin (IKE) being the most extensively studied. RSL3 and ML162 contain chloroacetamide moieties that can covalently react with nucleophilic residues. RSL3 and ML162 are able to bind to and inhibit GPX4 enzymatic activity or degrade GPX4 in lysate-based assays, though it has been found that RSL3 and ML162 do not inhibit purified GPX4 in vitro and target other selenoproteins such as thioredoxin reductase 1 (TXNRD1). However, other TXNRD1 inhibitors do not trigger ferroptosis, suggesting that TXNRD1 inhibition is not sufficient to trigger ferroptosis. The GPX4-inhibiting activity of RSL3 has also been suggested to be regulated by other factors such as 14-3-3ε or through broad targeting of the selenoproteome.
Pregnenolone acetate (brand names Antofin, Previsone, Pregno-Pan), also known as pregn-5-en-3β-ol-20-one 3β-acetate, is a synthetic pregnane steroid and an ester of pregnenolone which is described as a glucocorticoid and as a skin-conditioning and skin anti-aging agent. It has been reported to reduce wrinkles in elderly women when applied in the form of a 0.5% topical cream, effects which were suggested to be due to improved hydration of the skin. Pregnenolone acetate has been marketed in France in a topical cream containing 1% pregnenolone acetate and 10% "sex hormone" for the treatment of premature skin aging but was withdrawn from the market in 1992. Although the medication has been described by some sources as a glucocorticoid, other authors have stated that systemic pregnenolone acetate has no undesirable metabolic or toxic effects even at high doses.
=== Malema advertisement === During the South African national elections of 2009, Nando's made an advert lampooning African National Congress Youth League then president Julius Malema by using a puppet that resembled him. Malema's lawyers sued Nando's and the original advert was removed. However, an altered version was released, with the puppet's face pixelated and the voice altered. The puppet used in the advert was later sold at auction for 100,000 rand, which was donated to an educational charity.
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.