If you have been reading about nuclear receptor and want a single page that covers the useful parts, this is it: definitions, context, how it is studied, and the questions that come up repeatedly.
Last reviewed on 2025-07-25. 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.
Research interest in SR9009 grew from studies of circadian biology and metabolic disease. Preclinical reports describe effects on exercise capacity, muscle metabolism, and blood lipid levels in rodents, but these findings come from controlled laboratory settings. The compound has low oral bioavailability in animals, which limits systemic exposure after swallowing. Investigators often use injected routes in experiments to achieve measurable plasma concentrations. Human clinical data are sparse, no approved therapeutic product exists, and whether animal effects translate to humans remains an open question.
Regulatory and sporting contexts treat SR9009 as a prohibited substance in many elite competitions. Its presence on banned lists reflects concerns about performance enhancement and unknown long-term safety. Analytical chemists have developed methods to detect the parent compound and its metabolites in urine and blood. Literature discussions distinguish between in vitro potency, animal pharmacology, and anecdotal human reports. The latter are difficult to verify because products sold online may lack purity or contain different compounds.
| 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 |
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.
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.
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.
SR9009 is frequently discussed alongside other REV-ERB ligands, including synthetic agonists and natural heme-related molecules. Its selectivity for REV-ERB over related nuclear receptors has been measured in binding and reporter assays, though off-target activity at higher concentrations is possible. The compound is prohibited in sport by the World Anti-Doping Agency, and it is not approved for any medical use in major jurisdictions. Products sold online may be labeled as research chemicals, and their identity and purity are not guaranteed by regulatory review.
SR9009 is a synthetic small molecule that acts on the nuclear receptors REV-ERBα and REV-ERBβ. These receptors are part of the circadian clock machinery and normally repress transcription of certain target genes. In laboratory research, SR9009 is used as a chemical tool to study how REV-ERB activity influences metabolism, inflammation, and daily biological rhythms. The compound is not an approved medicine, and its effects in humans remain largely uncharacterized. It is often described as an investigational agent rather than a therapeutic product.
REV-ERB proteins typically suppress gene expression by recruiting corepressor complexes to DNA response elements. SR9009 binds these receptors and strengthens that repressive action in cell-based assays. Studies in rodents have reported changes in lipid handling, mitochondrial function, and exercise capacity after treatment. Such findings are often cited as evidence for metabolic effects, but species differences and limited pharmacokinetic data make direct translation to humans uncertain. Researchers continue to examine which effects are robust and which depend on specific experimental conditions.
==== Chemically reactive agents ==== Agents such as hydrogen peroxide, elemental chlorine, hypochlorous acid (chlorine water), bromine, bromine water, iodine, nitric and oxidising acids, and ozone react with sensitive moieties such as sulfide/thiol, activated aromatic rings (phenylalanine) in effect damage the protein and render it useless.
==== Preventive measures ==== In August 2010, Purdue Pharma reformulated their long-acting oxycodone line, marketed as OxyContin, using a polymer, Intac, to make the pills more difficult to crush or dissolve in water to reduce non-medical use of OxyContin. Inactive ingredients/excipients are butylated hydroxytoluene (BHT), hypromellose, polyethylene glycol 400, polyethylene oxide, magnesium stearate, and titanium dioxide. The FDA approved relabeling the reformulated version as abuse-resistant in April 2013. Pfizer manufactures a preparation of short-acting oxycodone, marketed as Oxecta, which contains inactive ingredients, referred to as tamper-resistant Aversion Technology. Approved by the FDA in the U.S. in June 2011, the new formulation, while not being able to deter oral recreational use, makes crushing, chewing, snorting, or injecting the opioid impractical because of a change in its chemical properties.
16 July – Starmer suspends Neil Duncan-Jordan, Brian Leishman, Chris Hinchliff and Rachael Maskell from the Parliamentary Labour Party for repeated breaches of party discipline. 17 July – Prime Minister Keir Starmer and German Chancellor Friedrich Merz sign the Kensington Treaty during Merz's first official visit to the UK. The treaty includes plans for a direct train link between London and Berlin. Publication of the Elections Bill, which includes provisions for lowering the age of voting to 16 for the next general election. Diane Abbott is suspended from the Labour Party pending an investigation into comments she is alleged to have made about racism. 18 July – Sir Wayne David announces he is standing down as chief special adviser to Eluned Morgan for health reasons. 20 July – Nigel Farage accuses council officials of obstructing the work of Reform UK councillors as he defends the way the party is running some local authorities. 21 July – Nigel Farage proposes creating 30,000 prison places by sending some UK prisoners overseas to serve their sentences, repatriating foreign prisoners accommodated in UK prisons and building five new prisons. He also proposes recruiting a further 30,000 police officers. Outgoing Scottish Greens co-leader Patrick Harvie is selected as the party's top candidate for the Scottish Parliament's Glasgow regional constituency, giving him a strong change of re-election at the 2026 Scottish Parliament election. 22 July – Kemi Badenoch conducts a shadow cabinet reshuffle, her first as Leader of the Opposition.
The president is directly elected by popular vote for a renewable six-year term. Requirements for this position, which were enacted by the PAP government, are extremely stringent, such that only a handful of people qualify for the candidacy. These qualifications include that a candidate needs to be a person at least 45 years of age who is no longer a member of a political party, to either have held public office for at least 3 years in a number of specific public service leadership roles, or to have 3 years experience as chief executive of a fully profitable private sector company with at least S$500 million in shareholders' equity, be a resident in Singapore for at least 10 years, not have a criminal record, and more. Candidates must also "satisfy" the Presidential Elections Committee (PEC) that they are a person of integrity, good character and reputation. From 2017, the Constitution requires that presidential elections be "reserved" for a racial community if no one from that ethnic group has been elected to the presidency in the five most recent terms. Only members of that community may qualify as candidates in a reserved presidential election. In the 2017 presidential election, this combination of stringent requirements and a reserved election that required the candidate to be of the 13% Malay ethnic group led to the PEC approving a single candidate for the presidency; Halimah Yacob, considered part of the Malay community, won in an uncontested election. She also became Singapore's first female president.
Sources: en.wikipedia.org
== Background on native platelets == Native platelets play a vital role in hemostasis, the process of blood clotting and wound healing. Also known as thrombocytes, platelets are anucleate cell fragments derived from megakaryocytes in the bone marrow. Under healthy conditions, platelets circulate in an inactive state within the bloodstream and rapidly respond to vascular injury by initiating a complex cascade of coagulation events to prevent excessive blood loss. Native platelets are 2-3 micrometers in diameter and possess a highly specialized structure that enables their function in clot formation. Their cytoplasm contains dense granules and alpha granules, which store essential molecules such as adenosine diphosphate (ADP), serotonin, fibrinogen, and growth factors. These molecules are important for platelet activation, adhesion, and recruitment of additional platelets during vascular injury. The platelet membrane contains an abundance of glycoproteins, including integrins and receptors like glycoprotein Ib-IX-V and glycoprotein IIb/IIIa, which mediate interactions with the vascular endothelium and other platelets. A cytoskeleton composed of actin and tubulin allows platelets to change shape during activation, which extends filopodia to enhance adhesion and clot stability. Platelets engage in the following three-step process to form a stable blood clot: adhesion, activation, and aggregation.
For Canadian domestic consumption of non-CRFPCP pork, ractopamine hydrochloride is permitted to be sold over the counter with applications in meal or pellet feed for finishing barrows and gilts (up to 10 mg/kg for last six weeks), confined finishing cattle (up to 30 mg/kg for last 42 days), and finishing heavy turkeys (up to 9 mg/kg for 14 days). The withdrawal period was set to 0 days.
Ukrainian authorities said they shot down 17 missiles and 31 drones launched from Russia overnight. Strikes were reported in Dnipro and Kharkiv, including an oil depot. In Kyiv, fragments of intercepted drones fell on the roof of a shopping centre, while a house and several cars were damaged. A Russian S-300 missile hit a dam in Karlivka, Donetsk Oblast, placing nearby settlements under threat of severe flooding from the Karlivske Reservoir. Two people were killed and 23 injured in a missile strike at a clinic in Dnipro. The Russian Defence Ministry claimed it had struck ammunition depots in those attacks and said all targets had been hit. In Russia, a blast alleged to have been caused by two Ukrainian drones damaged a residential and office building in Krasnodar. Four districts in Belgorod Oblast were shelled from the Ukrainian border, while a Ukrainian missile was reportedly shot down over Morozovsk, in Rostov Oblast. The United States announced sanctions against Ivan Maslov, head of the Wagner Group's operations in Mali, saying that the group was procuring weaponry across Africa to use in the war in Ukraine. The Japanese Foreign Ministry announced additional sanctions on Russia, saying that it would freeze the assets of 78 groups and 17 individuals, including army officers and ban exports to 80 entities such as military-affiliated research labs. It also said it would ban providing construction and engineering services to Russia.
== Partial EMT or a hybrid E/M phenotype == Not all cells undergo a complete EMT, i.e. losing their cell-cell adhesion and gaining solitary migration characteristics. Instead, most cells undergo partial EMT, a state in which they retain some epithelial traits such as cell-cell adhesion or apico-basal polarity, and gain migratory traits, thus cells in this hybrid epithelial/mesenchymal (E/M) phenotype are endowed with special properties such as collective cell migration. Single-cell tracking contributes to enabling the visualization of morphological transitions during EMT, the discernment of cell migration phenotypes, and the correlation of the heritability of these traits among sister cells. Two mathematical models have been proposed, attempting to explain the emergence of this hybrid E/M phenotype, and its highly likely that different cell lines adopt different hybrid state(s), as shown by experiments in MCF10A, HMLE and H1975 cell lines. Although a hybrid E/M state has been referred to as 'metastable' or transient, recent experiments in H1975 cells suggest that this state can be stably maintained by cells.
Sugar cane requires a frost-free climate with sufficient rainfall during the growing season to make full use of the plant's substantial growth potential. The crop is harvested mechanically or by hand, chopped into lengths and conveyed rapidly to the processing plant (commonly known as a sugar mill) where it is either milled and the juice extracted with water or extracted by diffusion. The juice is clarified with lime and heated to destroy enzymes. The resulting thin syrup is concentrated in a series of evaporators, after which further water is removed. The resulting supersaturated solution is seeded with sugar crystals, facilitating crystal formation and drying. Molasses is a by-product of the process and the fibre from the stems, known as bagasse, is burned to provide energy for the sugar extraction process. The crystals of raw sugar have a sticky brown coating and either can be used as they are, can be bleached by sulfur dioxide, or can be treated in a carbonatation process to produce a whiter product. About 2,500 litres (660 US gal) of irrigation water is needed for every one kilogram (2.2 pounds) of sugar produced.
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 small molecule studied as an agonist of the REV-ERB nuclear receptors. It is not an approved medicine, and its effects in humans are not well characterized.