A practical reference on alpha-MSH: what it is, how it behaves, what the literature reports, and where the honest uncertainties sit.
This page was last updated on 2026-03-25 and is reviewed periodically as new material appears.
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.
Identity and purity are assessed mainly by reversed-phase high-performance liquid chromatography with ultraviolet detection, often paired with mass spectrometry. Retention time supports identity, while the mass spectrum confirms the molecular weight of the intact peptide. Purity is frequently reported as a percentage of total peak area, a figure that depends on the wavelength, column and gradient used. Impurity profiling may also look for truncated sequences, oxidised forms and residual counterions. Amino acid analysis and peptide mapping provide orthogonal confirmation when required.
Regulatory status varies by jurisdiction, and the substance is frequently described as unapproved for therapeutic use. Some authorities classify it alongside prescription-only medicines or controlled categories, while others address it through general consumer protection rules. Analytical surveys have reported mismatches between label claims and measured content in products sold online, although the scope of such testing is limited. Whether these discrepancies are widespread remains an open question. Discussion in the literature therefore tends to combine chemistry, supply-chain observation and policy analysis.
| Property | Value | Notes |
|---|---|---|
| Molecular formula | C50H69N15O9 | Free base; salt forms differ |
| Molecular weight | Approximately 1024 g/mol | Calculated for the free base |
| Appearance | White to off-white powder | Typically supplied as a lyophilised solid |
| Solubility | Soluble in water and polar solvents | Poorly soluble in non-polar solvents |
| Typical storage | -20 degrees Celsius, dry, protected from light | Refers to the solid form |
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.
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.
== External links == "Bombesin Receptors: BB2". IUPHAR Database of Receptors and Ion Channels. International Union of Basic and Clinical Pharmacology. Archived from the original on 2016-03-03. Retrieved 2007-10-25. IUPHAR GPCR Database - BB2 receptor Archived 2016-03-03 at the Wayback Machine Receptors,+Bombesin at the U.S. National Library of Medicine Medical Subject Headings (MeSH) This article incorporates text from the United States National Library of Medicine, which is in the public domain.
== External links == Parathyroid+Hormone+Receptors at the U.S. National Library of Medicine Medical Subject Headings (MeSH) "Parathyroid Hormone Receptors". IUPHAR Database of Receptors and Ion Channels. International Union of Basic and Clinical Pharmacology.
== Environment == Penicillium expansum grows best in wet, cool (<25C) conditions. P. expansum was found to grow most efficiently in a temperature range of 15–27 degrees Celsius (~59–81 °F), with slower growth at lower and higher temperatures. P. expansum grows best in wet conditions; growth rate has been found to be fastest at a relative humidity of 90%. P. expansum infection acidifies host tissues via the secretion of organic acids, and that acidification enhances fungal development, indicating a link between environmental acidity and P. expansum virulence.
== Research == Immunomodulating substances, such as drugs that prevent acetylcholine receptor modulation by the immune system, are currently being researched. Some research recently has been on anti-c5 inhibitors for treatment research as they are safe and used in the treatment of other diseases. Ephedrine seems to benefit some people more than other medications, but it has not been properly studied as of 2014. In the laboratory, MG is mostly studied in model organisms, such as rodents. In addition, in 2015, scientists developed an in vitro functional, all-human, neuromuscular junction assay from human embryonic stem cells and somatic-muscle stem cells. After the addition of pathogenic antibodies against the acetylcholine receptor and activation of the complement system, the neuromuscular co-culture shows symptoms such as weaker muscle contractions. Recent years, scientists have been working on finding the reliable biomarkers for MG to monitor the disease development and assess the severity.
Sources: en.wikipedia.org
"If you lift the skin off the vagina on the side walls, you get the bulbs of the clitoris – triangular, crescental masses of erectile tissue". O'Connell et al., having performed dissections on the vulvas of cadavers and used photography to map the structure of nerves in the clitoris, made the assertion in 1998 that there is more erectile tissue associated with the clitoris than is generally described in anatomical textbooks and were thus already aware that the clitoris is more than just its glans. They concluded that some females have more extensive clitoral tissues and nerves than others, especially having observed this in young cadavers compared to elderly ones, and therefore whereas the majority of females can only achieve orgasm by direct stimulation of the external parts of the clitoris, the stimulation of the more generalized tissues of the clitoris via vaginal intercourse may be sufficient for others. French researchers Odile Buisson and Pierre Foldès reported similar findings to that of O'Connell's. In 2008, they published the first complete 3D sonography of the stimulated clitoris and republished it in 2009 with new research, demonstrating how erectile tissue of the clitoris engorges and surrounds the vagina. Based on their findings, they argued that women may be able to achieve vaginal orgasm through stimulation of the G-spot because the clitoris is pulled closely to the anterior wall of the vagina when the woman is sexually aroused and during vaginal penetration.
=== Field management === As mentioned, permissive hypotension (restrictive fluid therapy) is unwise. Careful fluid overload and administration of intravenous sodium bicarbonate is wise, especially if the crushing weight is on the patient for more than four hours, but often if it persists more than one hour. The San Francisco emergency services protocol calls for a basic adult dose of a 2 L bolus of normal saline followed by 500 mL/h, limited for "pediatric patients and patients with history of cardiac or renal dysfunction". Use of a tourniquet can stall the life-threatening consequences of a crush related injury and can be a second option if the person cannot immediately have the fluids that were lost be medically replaced back into the body. Tourniquet measures should be taken if the person has been trapped for more than two hours.
== Early life == Saleh al-Fawzan was born on 28 September 1935 (1354 AH) in Ash-Shamasiyyah in the Al-Qassim Province of the Kingdom of Saudi Arabia, near the city of Buraydah. He belongs to the Al-Wadain branch of the Al-Shammās clan of the Ad-Dawāsir tribe. His great grandfather on his mother's side is Aba Butayn. His father died during his early childhood, and he was raised by his family. He learned the Quran, and received his initial instruction in reading and writing from local mosque's imām, Ḥamūd ibn Sulaymān At-Tilāl, who later served as a judge (Qadi) in the town of Dariyah, Al-Qassim Province of the Saudi Arabia.
The NADP+ structural site is located greater than 20Å away from the substrate binding site and the catalytic coenzyme NADP+ binding site. Its purpose in the enzyme catalyzed reaction has been unclear for many years. For some time, it was thought that NADP+ binding to the structural site was necessary for dimerization of the enzyme monomers. However, this was shown to be incorrect. On the other hand, it was shown that the presence of NADP+ at the structural site promotes the dimerization of dimers to form enzyme tetramers. It was also thought that the tetramer state was necessary for catalytic activity; however, this too was shown to be false. The NADP+ structural site is quite different from the NADP+ catalytic coenzyme binding site, and contains the nucleotide-binding fingerprint. The structural site bound to NADP+ possesses favorable interactions that keep it tightly bound. In particular, there is a strong network of hydrogen bonding with electrostatic charges being diffused across multiple atoms through hydrogen bonding with four water molecules (see figure). Moreover, there is an extremely strong set of hydrophobic stacking interactions that result in overlapping π systems.
== As a target == Elongation factors are targets for the toxins of some pathogens. For instance, Corynebacterium diphtheriae produces diphtheria toxin, which alters protein function in the host by inactivating elongation factor (EF-2). This results in the pathology and symptoms associated with diphtheria. Likewise, Pseudomonas aeruginosa exotoxin A inactivates EF-2.
Sources: en.wikipedia.org
Balloon syndrome is a rare condition in hedgehogs in which gas is trapped under the skin as a result of injury or infection, causing the animal to inflate. It is akin to surgical emphysema seen in humans, although somewhat more profound in hedgehogs due to their tissue structure. It is thought to be caused by a sudden blow to the hedgehog, such as a kick from a horse or human. Balloon syndrome is a life threatening condition, and without medical intervention the hedgehog will die of suffocation.
== History == The earliest description of a lectin is believed to have been given by Peter Hermann Stillmark in his doctoral thesis presented in 1888 to the Imperial University of Dorpat. Stillmark isolated ricin, an extremely toxic hemagglutinin, from seeds of the castor plant (Ricinus communis). Although lectins were first discovered in plants, they are now known to be present throughout nature. The first lectin to be purified on a large scale and available on a commercial basis was concanavalin A, which is now the most-used lectin for characterization and purification of sugar-containing molecules and cellular structures. The legume lectins are probably the most well-studied lectins. Long before a deeper understanding of their numerous biological functions was developed, the plant lectins, also known as phytohemagglutinins, were noted for their particularly high specificity for foreign glycoconjugates (e.g., those of fungi and animals) and used in biomedicine for blood cell testing and in biochemistry for fractionation.
A major use of formic acid is as a preservative and antibacterial agent in livestock feed. It arrests certain decay processes and causes the feed to retain its nutritive value longer. In Europe, it is applied on silage, including fresh hay, to promote the fermentation of lactic acid and to suppress the formation of butyric acid; it also allows fermentation to occur quickly, and at a lower temperature, reducing the loss of nutritional value. It is widely used to preserve winter feed for cattle, and is sometimes added to poultry feed to kill E. coli bacteria. Use as a preservative for silage and other animal feed constituted 30% of the global consumption in 2009. Beekeepers use formic acid as a miticide against the tracheal mite (Acarapis woodi) and the Varroa destructor mite and Varroa jacobsoni mite.
=== Geometrical factors === Successive stepwise formation constants Kn in a series such as MLn (n = 1, 2, ...) usually decrease as n increases. Exceptions to this rule occur when the geometry of the MLn complexes is not the same for all members of the series. The classic example is the formation of the diamminesilver(I) complex [Ag(NH3)2]+ in aqueous solution.
Sources: en.wikipedia.org
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.
Both are synthetic analogues derived from the same parent hormone. Reference descriptions usually characterise afamelanotide as more selective for the MC1R subtype, whereas melanotan-2 is reported to interact with a wider range of melanocortin receptors.
Early studies explored melanocortin signalling and pigmentation, which later led to informal use of the label tanning peptide. That label is not a regulatory category and does not imply approved status for any purpose.
The dry powder is more stable during transport and storage than a solution. It also allows a known amount of material to be reconstituted at a chosen concentration.