Everything below concerns alpha-MSH analogue. We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Last reviewed on 2025-10-12. Where a claim depends on a specific study, the study is described rather than over-claimed.
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.
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 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.
| Property | Value | Notes |
|---|---|---|
| Molecular class | Synthetic cyclic heptapeptide | Analog of alpha-MSH with an internal lactam bridge |
| Molecular weight | Approximately 1024 daltons | Free base value; salt forms differ |
| Appearance | White to off-white powder | Usually supplied as a lyophilized solid |
| Solubility | Freely soluble in water | Poorly soluble in nonpolar solvents |
| Typical storage | −20 °C, dry, protected from light | Repeated freeze-thaw cycles degrade peptides |
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.
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.
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.
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.
== Early life and education == Born in 1953 and raised in Dearborn, Michigan, Tippett is an alumnus of Kalamazoo College and holds a Ph.D. and M.D. from Case Western Reserve University School of Medicine. He studied at the Rockefeller University in New York under Nobel Prize winner Robert Bruce Merrifield, directing his doctoral research efforts toward the metabolic indicators of peptide synthesis. He completed his internship and residency in Internal Medicine at Cleveland Metropolitan General Hospital, and spent 1975-1985 engaged in biochemical research.
==== Student loan repayments ==== Student loan repayments made by employers to their employees were temporarily tax-free to the employees but they are now permanently tax-free. The tax-free limit per year will be indexed for inflation starting in 2026.
=== Misinformation === TikTok has banned Holocaust denial, but other conspiracy theories have become popular on the platform, such as Pizzagate and QAnon (two conspiracy theories popular among the US alt-right) whose hashtags reached almost 80 million views and 50 million views respectively by June 2020. The platform has also been used to spread misinformation about the COVID-19 pandemic, such as clips from Plandemic. TikTok removed some of these videos and has generally added links to accurate COVID-19 information on videos with tags related to the pandemic. In January 2020, left-leaning media watchdog Media Matters for America said that TikTok hosted misinformation related to the COVID-19 pandemic despite a recent policy against misinformation. In April 2020, the government of India asked TikTok to remove users posting misinformation related to the COVID-19 pandemic. There were also multiple conspiracy theories that the government is involved with the spread of the pandemic. It reported that in the second half of 2020, over 340,000 videos in the US about election misinformation and 50,000 videos of COVID-19 misinformation were removed. To combat misinformation in the 2022 midterm election in the US, TikTok announced a midterms Elections Center available in-app to users in 40 different languages. TikTok partnered with the National Association of Secretaries of State to give accurate local information to users.
=== Category:EC 1.7 (act on other nitrogenous compounds as donors) === Category:EC 1.7.1 (with NAD+ or NADP+ as acceptor) Category:EC 1.7.2 (with a cytochrome as acceptor) Category:EC 1.7.3 (with oxygen as acceptor) Urate oxidase EC 1.7.3.3 Category:EC 1.7.7 (with an iron–sulfur protein as acceptor) Category:EC 1.7.99 (with other acceptors) Nitrite reductase EC 1.7.99.3 Nitrate reductase EC 1.7.99.4
Sources: en.wikipedia.org
This acquisition increased the total number of 7-Eleven stores in the US and Canada to nearly 9800. Following the purchase, the Oklahoma 7-Elevens were fully integrated into national branding, marketing, and loyalty campaigns. In April 2021, 7-Eleven launched the "Take it to Eleven" ad campaign. The slogan was partially inspired by the chain's name, but also the term "up to eleven" made popular in the film This is Spinal Tap. The slogan was only for the main 7-Eleven brand and not A-Plus or Stripes. By summer 2021, the company had installed just a few electric vehicle charging stations, but announced plans to expand considerably, with a target of 250 DC fast-charging locations in the U.S. and Canada by the end of 2022, starting with four states (California, Colorado, Florida and Texas). Less than two years later, in mid-March 2023, 7-Eleven announced plans for 7Charge, "its new, proprietary EV charging network and app", promoting the Android and iOS mobile apps, which allow users to find 7-Eleven - and future Speedway and Stripes - charger locations and pay for charging. 7Charge locations offer CCS and CHAdeMO charging; Tesla drivers, and other vehicles using the (once-proprietary) NACS connector, can also charge, but require a user-supplied CCS adapter. In August 2022, 7-Eleven acquired Skipcart, a same-day and on-demand delivery platform. In early 2024, parent company Seven & i Holdings' CEO Ryuichi Isaka announced changes to the business model of US stores, placing the company's focus on fresh foods instead of a "[reliance] on gasoline and cigarettes".
Christianity and Islam had the highest number of adherents among the religious citizens. Eastern Christianity predominated among Christians, with Russia's traditional Russian Orthodox Church being the largest Christian denomination. About 90% of the Soviet Union's Muslims were Sunnis, with Shias being concentrated in the Azerbaijan SSR. Smaller groups included Roman Catholics, Jews, Buddhists, and a variety of Protestant denominations (especially Baptists and Lutherans). Religious influence had been strong in the Russian Empire. The Russian Orthodox Church enjoyed a privileged status as the church of the monarchy and took part in carrying out official state functions. The immediate period following the establishment of the Soviet state included a struggle against the Orthodox Church, which the revolutionaries considered an ally of the former ruling classes. In Soviet law, the 'freedom to hold religious services' was constitutionally guaranteed, although the ruling Communist Party regarded religion as incompatible with the Marxist spirit of scientific materialism. In practice, the Soviet system subscribed to a narrow interpretation of this right, and in fact used a range of official measures to discourage religion and curb the activities of religious groups. The 1918 Council of People's Commissars decree establishing the Russian SFSR as a secular state also decreed that 'the teaching of religion in all [places] where subjects of general instruction are taught, is forbidden.
Defects of spectrin, ankyrin (most commonly), or PROTEIN 4.2 lead to reduced structural integrity of the plasma membrane, destabilizing the overlying lipid bilayer, and releasing band 3-containing microvesicles. Band-3 is important for gas exchange (as seen above). Defects of band 3 lead to band 3 deficiency and loss of its lipid-stabilizing effect within the plasma membrane lipid bilayer. This results in the release of band 3-free microvesicles. Both pathways result in compromised plasma membrane integrity, decreased surface area, and formation of spherocytes with decreased mechanical compliance during circulation.
The oubli plant (from which the protein was isolated) grows in Gabon and Cameroon where its fruit has been consumed by apes and local people over history. Due to brazzein and pentadin, the berries of the plant have exceptional sweetness. Locals call the berries "oubli" (French for "forgot") in their vernacular language because their taste is said to encourage nursing infants to forget their mother's milk, as once babies eat them, they may forget to return to their mothers.
==== Blood ==== The three species of vampire bat strictly feed on animal blood (hematophagy); the common vampire bat feeds on mammals, while the hairy-legged (Diphylla ecaudata) and white-winged vampire bats (Diaemus youngi) feed on birds. Vampire bats target sleeping prey and can sense deep breathing. They cut through and peel the animal's skin with their teeth and lap up the blood with their tongues, which have grooves on the underside adapted to this purpose. Certain substances in the saliva keep the blood flowing.
Sources: en.wikipedia.org
Negative views of the vagina are simultaneously contrasted by views that it is a powerful symbol of female sexuality, spirituality, or life. Author Denise Linn stated that the vagina "is a powerful symbol of womanliness, openness, acceptance, and receptivity. It is the inner valley spirit". Sigmund Freud placed significant value on the vagina, postulating the concept that vaginal orgasm is separate from clitoral orgasm, and that, upon reaching puberty, the proper response of mature women is a changeover to vaginal orgasms (meaning orgasms without any clitoral stimulation). This theory made many women feel inadequate, as the majority of women cannot achieve orgasm via vaginal intercourse alone. Regarding religion, the womb represents a powerful symbol as the yoni in Hinduism, which represents "the feminine potency", and this may indicate the value that Hindu society has given female sexuality and the vagina's ability to deliver life; however, yoni as a representation of "womb" is not the primary denotation. While, in ancient times, the vagina was often considered equivalent (homologous) to the penis, with anatomists Galen (129 AD – 200 AD) and Vesalius (1514–1564) regarding the organs as structurally the same except for the vagina being inverted, anatomical studies over latter centuries showed the clitoris to be the penile equivalent.
For example, the latter could be reduced with hydrogen to 249CfBr2, but the former could not – this result was reproduced on individual 249BkBr3 and 249CfBr3 samples, as well on the samples containing both bromides. The intergrowth of californium in berkelium occurs at a rate of 0.22% per day and is an obstacle to studying berkelium properties. Beside a chemical contamination, 249Cf, being an alpha emitter, brings undesirable self-damage of the crystal lattice and the resulting self-heating. The chemical effect however can be avoided by performing measurements as a function of time and extrapolating the obtained results.
==== Tax deduction for qualified tip income ==== The law creates new tax deductions for tips of up to $25,000 per year received by workers earning less than $150,000, with the tax deduction set to expire in 2028. In order to be eligible, a tip must be paid voluntarily by the payor, and the payor must determine the amount of the tip. The payor must not be subject to a penalty if they do not pay a tip, and the tips must not be subject to any negotiation. The tip must be given to workers working one of 68 different job types. Tips received while performing a service that is a felony or misdemeanor are not eligible. Tips received for prostitution or pornography are not eligible. Tips received as part of a tip pool are generally eligible. Tips received directly by a supervisor or manager are eligible only if they are for services they provided in a qualified occupation and not as part of a tip pool. If the customer is charged a service charge or an automatic tip amount that is not voluntary on the part of the customer, then the service charge or tip is not eligible. This includes if the company requires a customer to pay a service charge or a particular tip amount on parties greater than a certain size. Voluntary tips above such a minimum or mandatory charge are eligible. Recommended tips are eligible if they are optional on the part of the payer. If the customer is required to select a tip amount but does not have the option to choose to not tip at all, the minimum possible tip amount is not eligible but any tips exceeding that minimum are eligible.
In June 2022, FCC Commissioner Brendan Carr called for Google and Apple to remove TikTok from their app stores, saying sensitive data were being accessed from Beijing and ByteDance would be "required by law to comply with [Chinese government] surveillance demands." In November 2022, Christopher A. Wray, director of the Federal Bureau of Investigation (FBI), said the Chinese government could use TikTok for influence operations on its users. In May 2023, a former ByteDance employee filed a wrongful termination lawsuit alleging that Hong Kong users' device information and communications, particularly those of demonstrators in the 2019–2020 Hong Kong protests, were accessed by Chinese Communist Party members in 2018. ByteDance denied the claims, saying the employee worked on a defunct project and that TikTok was pulled out of Hong Kong in 2020. The whistleblower claimed in a sworn court statement that his father in mainland China had been detained by the authorities in retaliation for his speaking to the media about alleged censorship by TikTok. In June 2023, TikTok confirmed that some financial information, such as tax forms and Social Security numbers, of American content creators are stored in China. This applies to those signing contracts with and receiving payment transactions from ByteDance. Whether similar information will remain exempt from being treated as "protected user data" is being negotiated with Committee on Foreign Investment in the United States (CFIUS).
==== Cytokines ==== Illness can cause inflammation, which often involves an increase in cytokines such as TNFa, IL-1, and IL-6. Cytokines are implicated in NTIS. IL-1β has been shown to decrease liver D1, as well as thyroid hormone receptor (THR) levels. IL-6 and TNFa downregulate D1 and suppress TSH, are negatively correlated with fT3, and are positively correlated with rT3. NF-κB also inhibits D1, and decreases the expression of Thyroid receptors α and β. IFNy inhibits thyroid and Tg release, and also inhibits the upregulation of TSH receptors.
Sources: en.wikipedia.org
It is a synthetic seven-amino-acid peptide modeled on alpha-melanocyte-stimulating hormone. It carries two non-natural substitutions and a cyclic bridge that increase its stability relative to the natural hormone. It circulates as a research chemical and is not an approved medicine.
Melanotan-1, also called afamelanotide, is a shorter linear analog with a different amino acid sequence and no lactam ring. It has been evaluated in formal clinical programs, while melanotan-2 has not. The two are distinct molecules and are not interchangeable.
No. Bremelanotide is a related but distinct cyclic peptide that reached approved status for one specific clinical indication. Melanotan-2 is a separate molecule with its own sequence and properties. Shared ancestry in the melanocortin family does not make them the same substance.
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.