alpha-MSH analogue is one of those subjects where the details matter more than the headlines. This page pulls together the background, the mechanisms, and the practical points readers ask about most.
Updated 2026-05-31. Numbers and descriptions here follow the published literature rather than marketing material.
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.
Melanotan-2 is a synthetic cyclic heptapeptide designed as an analogue of alpha-melanocyte-stimulating hormone, a naturally occurring peptide involved in pigmentation signalling. Its sequence incorporates modified residues that increase potency and extend biological activity relative to the native hormone. The compound binds receptors of the melanocortin family and is examined mainly in laboratory research. It does not occur naturally and exists only as a manufactured chemical entity produced by solid-phase synthesis.
Outside regulated medicine, melanotan II circulates through online vendors as a research chemical, often marketed for tanning. Products sold this way vary widely in purity, concentration, and labeling accuracy, and independent testing has documented discrepancies. Published reports describe both pigment effects and adverse reactions, including nausea, flushing, and darkening of existing moles. Long-term safety data are sparse, and no large controlled trial has established a risk profile. Questions about cumulative effects on melanocytes remain unresolved in the literature.
Melanotan II is a synthetic peptide analog modeled on alpha-melanocyte-stimulating hormone, a naturally occurring signaling peptide involved in pigmentation. Its structure is a cyclic heptapeptide containing two non-natural substitutions, norleucine at position four and D-phenylalanine at position seven. These modifications resist enzymatic breakdown and extend the molecule's activity relative to the native hormone. The compound binds melanocortin receptors and is studied mainly as a pharmacological tool rather than a therapeutic product. It has never received approval as a medicine in any major jurisdiction.
The compound was developed in the late 1980s and 1990s by academic researchers investigating photoprotection. The rationale held that stimulating melanin production might reduce ultraviolet damage to skin and lower skin cancer risk. Early work examined receptor binding, pigment response, and short-term tolerability in small studies. That program did not produce an approved drug, and formal development stalled after early-phase trials. Whether induced pigmentation confers meaningful photoprotection remains an open question.
| 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 |
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.
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.
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.
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.
=== Views on Brexit and involvement in the campaign for a People's Vote === He described the 2016 Brexit referendum result to leave the European Union as "the greatest constitutional crisis of modern times" and condemned Leave campaigner Boris Johnson as a coward for pulling out of the Conservative leadership election after winning the referendum, likening him to "a general who has led his troops to the sound of guns, and, at first sight of battle, has left the field." Lord Heseltine queried the way Theresa May as home secretary campaigned to remain in the EU though "within a few weeks" of becoming PM, she insisted "Brexit means Brexit". Heseltine mentioned a speech by Theresa May before the EU referendum, where she urged Britain to "stand tall and lead in Europe". Heseltine said: "I don't know how someone who made that speech can, within a few weeks, say Brexit is Brexit and ask the nation to unite behind it...[unlike Margaret Thatcher] this lady was for turning." In March 2017 he was sacked from a number of advisory roles within government after rebelling over the article 50 legislation in the House of Lords, but said he would continue working to avert the "disaster" of Brexit. He later said that it was "quite unacceptable" for Germany to be in dominant position in Europe, having lost the Second World War. Heseltine feels the 48% of British voters who voted 'remain' are being ignored. He sees Brexit as a historic loss of power for Britain and feels Britain's interests are in Europe.
Pea protein is rich in nutrients such as protein and carbohydrates. Pea protein also contains vitamins and minerals and is low in fat. While generally rich in protein, the actual protein content of peas is variable and influenced by both genetic factors and environmental factors (such as soil and climate in which the peas are cultivated). Typically, peas contain 23.1–30.9% protein, 1.5–2.0% fat, and minor constituents such as vitamins, phytic acid, saponins, polyphenols, minerals, and oxalates. They also contain several classes of protein: globulin, albumin, prolamin, and glutelin. The proteins are mainly albumins and globulins, which account for 10-20% and 70-80% of the protein in the pea seed, respectively. The albumins are water-soluble and considered the metabolic and enzymatic proteins, while the globulins are salt soluble and act as the storage proteins for the seed. Globulins can be further classified into legumin and vicilin, which belong to the 11S and 7S seed storage protein classes, respectively. Legumin is a hexameric protein, and vicilin proteins are trimers. Pea protein is considered to be a complete protein, containing all the essential amino acids. However, it is not balanced, as it has high levels of lysine and threonine but relatively low amounts of sulfur-containing amino acids including cysteine and methionine. Pea seeds contain 60-65% carbohydrates mainly composed of oligosaccharides, monosaccharides, polysaccharides, and disaccharides. The major carbohydrate fraction in peas is starch, which is the major storage carbohydrate in the cotyledons.
Axial oscillations of ion rings are detected by their image current induced on the outer electrode which is split into two symmetrical pick-up sensors connected to a differential amplifier. By processing data in a manner similar to that used in Fourier-transform ion cyclotron resonance mass spectrometry (FTICR-MS), the trap can be used as a mass analyzer. Like in FTICR-MS, all the ions are detected simultaneously over some given period of time and resolution can be improved by increasing the strength of the field or by increasing the detection period. The Orbitrap differs from FTICR-MS by the absence of a magnetic field and hence has a significantly slower decrease of resolving power with increasing m/z.
Culbertson Jr.; 15,000 people are needed for each shuttle mission; the external tank has a half million gallons of fuel; the shuttle launches on the fourth attempt, two months after the first attempt; at 61,000 ft, it was at 1,700 mph; the rocket boosters were always jettisoned after two minutes and ten seconds; if two engines failed, the shuttle would land at Banjul International Airport in west Africa, if one engine failed, the shuttle would reach orbit; Hubert Brasseux, in charge of the shuttle toilet system - astronauts were strapped down to the toilet, and each had colour-coded individual urinal funnels; the Space Shuttle Orbital Maneuvering System is fired, in preparation for atmospheric entry; reentry occurs on day eleven - the underside reaches 2000C; the orbiter lands at 300 mph.
=== Human clinical studies === In human clinical studies, epitalon and epithalamin both significantly increased telomere lengths in the blood cells of patients of ages 60-65 and 75-80, and their efficacy was comparable to one another. Epitalon and epithalamin appear to restore melatonin secretion by the pineal gland in both aged monkeys and humans. A human clinical trial conducted on a sample of retinitis pigmentosa patients found that epitalon produced a positive clinical effect in 90% of cases in the treated group. In another human clinical trial conducted on a sample of pulmonary tuberculosis patients, epitalon did not appear to correct pre-existing structural aberrations of chromosomes associated with telomere degradation, but did appear to exert a protective effect against the future development of additional chromosomal aberrations. A human prospective cohort study conducted on a sample of 266 people over age 60 demonstrated that treatment with epithalamin, the pineal gland extract upon which epitalon is based, produced a 1.6–1.8-fold reduction in mortality during the following 6 years, a 2.5-fold reduction in mortality when combined with thymalin, and a 4.1-fold reduction in mortality when combined with thymalin and administered annually instead of only once at study onset.
Sources: en.wikipedia.org
==== Evolution of animal synthesis ==== Ascorbic acid is a common enzymatic cofactor in mammals used in the synthesis of collagen, as well as a powerful reducing agent capable of rapidly scavenging a number of reactive oxygen species (ROS). Given that ascorbate has these important functions, it is surprising that the ability to synthesize this molecule has not always been conserved. In fact, anthropoid primates, Cavia porcellus (guinea pigs), teleost fishes, most bats, and some passerine birds have all independently lost the ability to internally synthesize vitamin C in either the kidney or the liver. In all of the cases where genomic analysis was done on an ascorbic acid auxotroph, the origin of the change was found to be a result of loss-of-function mutations in the gene that encodes L-gulono-γ-lactone oxidase, the enzyme that catalyzes the last step of the ascorbic acid pathway outlined above. One explanation for the repeated loss of the ability to synthesize vitamin C is that it was the result of genetic drift; assuming that the diet was rich in vitamin C, natural selection would not act to preserve it.
Like other TCAs, doxepin is highly toxic in cases of overdose. Mild symptoms include drowsiness, stupor, blurred vision, and excessive dryness of mouth. More serious adverse effects include respiratory depression, hypotension, coma, convulsions, cardiac arrhythmia, and tachycardia. Urinary retention, decreased gastrointestinal motility (paralytic ileus), hyperthermia (or hypothermia), hypertension, dilated pupils, and hyperactive reflexes are other possible symptoms of doxepin overdose. Management of overdose is mostly supportive and symptomatic, and can include the administration of a gastric lavage so as to reduce absorption of the doxepin. Supportive measures to prevent respiratory aspiration is also advisable. Antiarrhythmic agents may be an appropriate measure to treat cardiac arrhythmias resulting from doxepin overdose. Slow intravenous administration of physostigmine may reverse some of the toxic effects of overdose such as anticholinergic effects. Haemodialysis is not recommended due to the high degree of protein binding with doxepin. ECG monitoring is recommended for several days after doxepin overdose due to the potential for cardiac conduction abnormalities.
Duterte has been described as a populist, with his foul-mouthed remarks against the country's elite which positioned him as a "man of the people" and was critical to his victory in the 2016 presidential election. He has also been compared to U.S. President Donald Trump for his rhetorical style. Duterte and his administration have been criticized for his anti-drug campaign, foreign policies, human rights record, extrajudicial killings during his term, political views, and controversial comments. Despite the criticisms on his administration, throughout his career, Duterte's remained hugely popular, attributed to his man-of-the-people style and a perception of strong leadership and success in fighting crime and corruption, while opponents reproach him for his authoritarian style and low tolerance of dissent. Analysts attribute his continued popularity to his emotional connection to the public, citing his charisma and humor, tough-talking manner, his image as a father figure as Tatay Digong (Father Digong), and Filipinos' general interest in strong leaders. A Social Weather Stations study concluded that there are multiple reasons for Duterte's high satisfaction ratings in surveys; these include his strong base support, satisfaction with the administration's overall governance (pamamalakad) and with some policy issues which include helping the poor and the drug war, and his character. Poll respondents who relate to or are attracted to some aspects of his character, such as his perceived decisiveness and diligence tend to be satisfied.
Women consistently presented higher obesity prevalence than men throughout the Vigitel surveillance period. In 2006, obesity affected 12.1% of women and 11.4% of men. By 2024, prevalence had increased to 26.7% among women and 24.4% among men. Both sexes experienced substantial increases in obesity prevalence, although women maintained higher rates throughout the period.
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.
It is a synthetic cyclic peptide designed as an analog of alpha-melanocyte-stimulating hormone. It acts on melanocortin receptors and is best known from research into pigmentation. It is not an approved pharmaceutical product.