circadian rhythm 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.
Last reviewed on 2026-04-24. Where a claim depends on a specific study, the study is described rather than over-claimed.
Analytical chemists detect SR9009 with liquid chromatography-tandem mass spectrometry, commonly abbreviated LC-MS/MS. Sample preparation may involve protein precipitation, liquid-liquid extraction, or solid-phase extraction before analysis. Laboratories can target the parent compound or its metabolites, depending on the matrix and the purpose of testing. Anti-doping methods require sensitive and specific assays because concentrations in biological samples can be low. Reference standards and validated methods are essential for reliable identification and quantification.
Regulatory agencies have not approved SR9009 for human therapeutic use. It is typically sold as a research chemical with labels stating that it is not for human consumption. The World Anti-Doping Agency prohibits the substance in sport, generally under the category of non-approved substances. Customs and national laws may restrict importation, sale, or possession. Product quality and legal status can vary by country and vendor, and therapeutic claims are not permitted in regulated advertising because the compound lacks approval.
Several misconceptions surround SR9009. It is often described as a SARM, a steroid, or an exercise pill, but its known target is the REV-ERB receptor family. Rodent studies have examined exercise capacity and metabolic markers, yet human outcomes remain unproven. Oral bioavailability appears low in animals, and human pharmacokinetics are not well characterized. Online products may contain impurities or different compounds, so identity and purity testing are important for research use.
SR9009 binds REV-ERB receptors and alters their repressive activity on target genes. This action can change transcription of genes involved in lipid handling, glucose metabolism, and mitochondrial function. In rodent studies, treated animals have shown changes in muscle oxidative capacity and exercise performance, though effects vary by dose, duration, and model. The precise molecular steps connecting receptor binding to whole-body outcomes are still an active area of investigation. Findings in animals do not automatically translate to humans.
Because REV-ERB receptors are core clock components, SR9009 has been examined for effects on daily rhythms as well as metabolism. Research has explored whether the compound can shift or reinforce circadian gene expression in tissues such as liver and muscle. Some studies report improved metabolic markers in obese or diabetic mice, while others show context-dependent responses. Questions remain about which effects are direct, which are secondary to timing, and how they might differ across species.
SR9009 is a synthetic small molecule studied as an agonist of REV-ERB nuclear receptors. REV-ERB alpha and REV-ERB beta help regulate circadian rhythms and metabolic gene expression. In laboratory research, SR9009 has been used to probe how these receptors affect skeletal muscle, liver, and adipose tissue. The compound was identified in academic drug-discovery work and is often described in scientific literature by its chemical name and research code. It is not an approved medicine, and human clinical data remain limited or absent.
| Property | Value | Notes |
|---|---|---|
| Regulatory status | Not approved for human use | Research-use-only status in many markets |
| WADA status | Prohibited in sport | Generally listed as a non-approved substance |
| Detection technique | LC-MS/MS | Common for urine and blood analysis |
| Common alias | Stenabolic | Informal market nickname, not a pharmacopoeial name |
| Purity check | HPLC or LC-UV | Independent certificate of analysis is typical |
SR9009 is a synthetic small molecule studied as a REV-ERB agonist. REV-ERBα and REV-ERBβ are nuclear receptors that help regulate circadian rhythms and metabolic gene expression. The compound was identified in academic screening efforts to find synthetic ligands for these receptors. In cell and animal studies, SR9009 alters transcription of genes involved in lipid and glucose metabolism, and it can shift circadian behavior. It is not an approved therapeutic agent.
Mechanistically, SR9009 binds the ligand-binding domain of REV-ERBα/β and enhances recruitment of corepressor complexes. This represses target genes rather than activating them. Because REV-ERB proteins normally compete with ROR proteins at shared response elements, the net effect depends on tissue and timing. Researchers use SR9009 to probe how nuclear receptor signaling links the clock to metabolism, inflammation, and muscle biology. Findings are largely preclinical, and the precise contribution of each receptor subtype remains under study.
SR9009 is frequently discussed in fitness and research-chemical contexts, yet it has no approved medical indication. Regulatory agencies have not authorized it for human use, and it is not a standard prescription drug. Some sports organizations list it as a prohibited substance because of its potential performance-enhancing properties. Published human data are sparse, so claims about its effects in people often rely on animal models or anecdotal reports. Quality and identity of online materials can vary widely.
Analytical identification of SR9009 typically relies on liquid chromatography coupled with tandem mass spectrometry. In biological samples, researchers first separate the compound from matrix components using protein precipitation, liquid-liquid extraction, or solid-phase extraction. High-performance liquid chromatography with ultraviolet detection and nuclear magnetic resonance spectroscopy can support structural confirmation of reference materials. Because SR9009 is a small, relatively lipophilic molecule, reverse-phase columns and acidic mobile phases are common. Laboratories often include isotope-labeled internal standards to improve quantification and to correct for ion suppression.
Stability depends on physical form, temperature, light exposure, and solvent. Solid SR9009 is generally stored cold and dry, with protection from light to limit degradation. Dimethyl sulfoxide stocks are common for laboratory work, but repeated freeze-thaw cycles can reduce compound integrity. Aqueous solutions may be less stable than organic stocks, and the ethyl ester in the structure can be susceptible to hydrolysis under certain conditions. Researchers typically validate storage conditions and recheck purity before quantitative experiments, especially when using archived material.
Regulatory treatment of SR9009 varies by country and region. It is not approved as a pharmaceutical, and several jurisdictions restrict its sale for human consumption. Some authorities classify it as a research chemical, a prescription-only substance, or a prohibited performance-enhancing agent in sport. Purchasers may encounter certificates of analysis, but these documents do not guarantee identity, purity, or legality. In research settings, institutional safety reviews and controlled procurement help ensure that materials are handled under appropriate oversight. The absence of harmonized rules means that legal status can change and requires verification.
=== Recreational use === As a μ-opioid agonist, tianeptine in large doses has high abuse potential. In 2001, Singapore's Ministry of Health restricted tianeptine prescribing to psychiatrists due to its recreational potential. Between 1989 and 2004, in France 141 cases of recreational use were identified, correlating to an incidence of 1 to 3 cases per 1000 persons treated with tianeptine and 45 between 2006 and 2011. According to Servier, stopping of treatment with tianeptine is difficult, due to the possibility of withdrawal symptoms. The severity of the withdrawal is dependent on the daily dose, with high doses being extremely difficult to quit. An official DEA statement states that the withdrawal symptoms in humans typically result in: agitation, nausea, vomiting, tachycardia, hypertension, diarrhea, tremor, and diaphoresis, similar to other opioid drugs. In 2007, according to French Health Products Safety Agency, tianeptine's manufacturer Servier agreed to modify the drug's label, following problems with dependency. Tianeptine has been intravenously injected by drug users in Russia. This method of administration reportedly causes an opioid-like effect and is sometimes used in an attempt to lessen opioid withdrawal symptoms. Tianeptine tablets contain silica and do not dissolve completely. Often the solution is not filtered well thus particles in the injected fluid block capillaries, leading to thrombosis and then severe necrosis.
At 10:07 on 24 September, Xi and Peng arrived at the White House, where they were greeted by President Trump and First Lady Melania Trump. Following the welcome ceremony, they entered the White House, and the national anthems of both countries were played. Trump gave a speech commenting on their history, saying "I'm delighted to welcome you to the beautiful White House. Such a great honor. In May, we had the great privilege of visiting you in Beijing, where you received our delegation with spectacular and very beautiful hospitality. Now, Melania and I are honored to host you in Washington," and "From the time of my first election in 2016, President Xi and I have forged a friendship, a truly great friendship, actually, built on mutual respect and the vital interests of our people", and that China and the United States have made "tremendous strides on the issues facing our two countries". He said the two nations were working together for a "more balanced trading relationship" including "new market access for American farmers and ranches". He added the two sides would discuss "security, technology and super intelligence" to "promote peace and prosperity for decades and decades to come". He said "our two countries do, really, the same thing - and we're very proud of it, and the relationship". Trump referenced the Sino-American alliance in World War II, saying "Look at the greatness that we had together, fighting in World War II", and that "brave American pilots" had fought for "the very survival of the legendary country".
=== Hospitals === Most clinical teaching takes place in facilities operated by UNC Health, primarily within the UNC Medical Center complex at the southern tip of the UNC campus. The complex comprises five healthcare facilities collectively known as UNC Hospitals, including North Carolina Memorial Hospital, North Carolina Children’s Hospital, North Carolina Women’s Hospital, North Carolina Neurosciences Hospital, and North Carolina Cancer Hospital. In 2024, the North Carolina Surgical Hospital was opened, featuring 26 new surgical spaces and 80 inpatient rooms. Together, these facilities offer over 1,000 inpatient beds and are ranked as the 2nd best hospital in the state of North Carolina. Additional hospitals and outpatient clinics in the area are also used for training, including the Ambulatory Care Center, the Family Medicine Building, UNC Hillsborough, and UNC Chatham. During the Application Phase (third year) of the school's MD program, students will be matched into one of six regions located across the state of North Carolina to complete their clinical clerkships at local facilities, including:
== Preparation == EDC is commercially available. It may be prepared by coupling ethyl isocyanate to N,N-dimethylpropane-1,3-diamine to give a urea, followed by a dehydration reaction mediated by TsCl and TEA:
Sources: en.wikipedia.org
In his 1987 book Spuren des Widerstands Die Bergarbeiterbewegung im Dritten Reich und im Exil (Traces of Resistance The Miners' Movement in the Third Reich and In Exile), Peukert began with the question "How does one write a history of continual failure?", which he answered with "To write a history of the resistance from the "loser's" viewpoint means trying to understand why, in spite of everything, they did not give up". Peukert argued even through the Social Democratic and Communist miners failed utterly in their attempts to overthrow the Nazi dictatorship, their willingness to take a stand, no matter how hopeless, and to suffer for their beliefs in the concentration camps meant that they should not be dismissed by historians as "losers". In the late 1980s, Peukert had been working on a project for a comprehensive alltagsgeschichte in Nazi Germany in northern Germany that was intended to be the counterpart to the "Bavaria project" led by Martin Broszat that sought to produce a comprehensive alltagsgeschichte in Nazi Germany in Bavaria.
=== Cancer diagnosis and departure === In the serial's first episodes of 2022, Ari takes the blame for Matthew's murder in order to protect Mia and Chloe. Ari is held on remand ahead of his sentencing hearing. Kipa-Williams explained that none of the Parata family can accept that Ari is going to prison. But he cannot accept seeing Chloe or Mia go there either, and he cannot work out a way where it would end well for them. Kipa-Williams continued, "He decides to take the fall because he knows he can handle it." Tane steps up as head of the family in Ari's absence, while Nikau pleads with his uncle to tell the police the truth. Kipa-Williams believed that his character's one regret was not marrying Mia. The storyline marked the beginning of Ari's exit from Home and Away, as he is later rushed to hospital with stabbing pains. Logan Bennett (Harley Bonner) initially thinks he may have appendicitis, but he later informs Ari that he has cancer of the appendix, which has spread to his abdomen. Logan also tells Ari that he could undergo a large, lengthy surgery to remove the tumours, but it would need to be repeated every few months. Ari decides not to go through with surgery as he wants to die on his terms. Daniel Kilkelly of Digital Spy reported that rumours of Kipa-Williams' exit from the serial had been circulating for months. Mia makes a "moving" proposal that she and Ari get married at the hospital, which he accepts. Ari insists that the day is about "celebration, not commiseration", and he and Mia marry in front of Tane, Nikau, and Chloe.
== Available forms == AzM is often used as active ingredient in organophosphate pesticides like Guthion, Gusathion (GUS), Gusathion-M, Crysthyron, Cotnion, Cotnion-methyl, Metriltrizotion, Carfene, Bay 9027, Bay 17147, and R-1852. This is why Guthion is often used as a nickname for AzM. Studies have shown that pure AzM is less toxic than GUS. This increased toxicity can be explained by the interactions between the different compounds in the mixture.
Sources: en.wikipedia.org
=== 31 May === One person was killed by Russian shelling in Vovchansk Raion in Kharkiv Oblast, while three people, including two children, were injured by Russian shelling in Kherson Oblast. One person was also killed by Russian shelling in Donetsk Oblast. Officials in the Russian-installed Luhansk People's Republic said that five people were killed and 19 others were injured after Ukrainian artillery hit a poultry farm. The State Border Guard Service of Ukraine reported that Russian troops had blown up a road that links Ukraine's Chernihiv Oblast with Russia's Bryansk Oblast, saying that the incident occurred at the tripoint between Ukraine, Russia and Belarus. Ukraine claimed that Russian-installed officials in occupied Luhansk were threatening to withhold the wages of workers who refused to open accounts at Russian banks. The Russian defence ministry claimed its forces had pushed out Ukrainian forces from positions around Krasnohorivka and Yasynuvata in Donetsk Oblast. A fire broke out at the Afipsky oil refinery in Russia's Krasnodar Krai. Veniamin Kondratyev, Governor of the region, blamed the fire on a Ukrainian drone strike. The fire was put out with minimal damage and no casualties. Another drone was reported to have crashed into the Ilsky refinery. The governor of Belgorod Oblast announced the beginning of evacuations of children from areas affected by Ukrainian shelling, saying that 300 children would be taken to Voronezh, about 250 km (160 mi) away, while another 1,000 children would be evacuated to other regions over the coming days.
This would be easier to log data and keep it accurate since it would be digital rather than in paper form. The clinical data repository is not without its weaknesses, however. Since they usually don't integrate with other non-clinical sources, following patient treatment across the care continuum becomes very difficult. In turn, tracking the true cost per case for each patient isn't feasible. IT teams spend most of their time gathering and compiling data instead of interpreting information and finding opportunities for cutting costs and improving patient care.
== Career == Balalaie joined the faculty of K. N. Toosi University of Technology as an Assistant Professor (1997-2003), was promoted to Associate Professor (2003-2007), and has served as a Full Professor since 2007. Throughout his career, he has maintained research collaborations with German institutions through multiple Alexander von Humboldt Foundation fellowships, beginning in 2002. His collaborations include work at Heidelberg University, University of Freiburg, Heinrich Heine University Düsseldorf, and the University of Duisburg-Essen. From 2015 to 2020, he served as the Scientific Ambassador of the Alexander von Humboldt Foundation in Iran, facilitating scientific cooperation between Iranian and German researchers.
Sources: en.wikipedia.org
Legality depends on the country and the intended use. In many places it is not approved as a medicine and may be sold only as a research chemical. Importation or possession can be restricted, and sports organizations prohibit it.
Anti-doping laboratories typically use LC-MS/MS to detect SR9009 or its metabolites in urine or blood. The exact assay depends on the laboratory and the testing program. Detection can be challenging because the compound may be rapidly metabolized and present at low levels.
Stenabolic is an informal nickname used in online fitness and research-chemical markets, not an official drug name. It likely references reported effects on endurance in rodent studies. The nickname does not imply approval or proven human benefit.
SR9009 is a synthetic research compound that acts on REV-ERB nuclear receptors. It is not approved for human use and is sold only as a research chemical. Its effects have been studied mainly in cells and rodents.