This is a working overview of LC-MS, written for readers who want more than a one-paragraph summary but less than a textbook.
Reviewed 2026-04-29. Anything still debated is marked as such rather than presented as settled.
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.
Research interest in SR9009 grew from studies showing improved running endurance in mice after short treatment periods. Those experiments linked the compound to increased mitochondrial content and fatty acid oxidation in muscle, but the findings come from animal models and specific dosing schedules. Independent replication has been limited, and the pathways connecting REV-ERB activation to exercise performance are still being mapped. Whether similar responses occur in humans is an open question.
SR9009 is often grouped with compounds studied for circadian and metabolic regulation rather than with classical anabolic steroids. Its interactions with nuclear receptors differ from those of androgen receptor ligands, and its proposed mechanisms involve transcriptional control rather than direct hormone signaling. Some sources classify it as a metabolic modulator because of observed effects on energy utilization. The distinction matters for regulation and for interpreting research results across different compound classes.
| Property | Value | Notes |
|---|---|---|
| Common synonyms | SR9009; Stenabolic | Nickname is not a chemical name. |
| Typical analytical method | LC-MS/MS | Often with isotope-labeled internal standard. |
| Storage temperature | -20 °C | Desiccated and protected from light. |
| Solution stability | DMSO stock; avoid freeze-thaw | Store at -20 to -80 °C. |
| Regulatory status | Not approved; varies by country | May be restricted as research chemical. |
SR9009 is a synthetic small molecule studied as an agonist of the nuclear receptors REV-ERBα and REV-ERBβ. It is not an approved medicine and has no established human therapeutic use. The compound appears in scientific literature as a tool for probing circadian and metabolic regulation. Online sellers often label it as a research chemical, sometimes using the nickname Stenabolic. Its chemical identity is distinct from selective androgen receptor modulators, stimulants, and peroxisome proliferator-activated receptor delta agonists. Researchers use it mainly in cell and animal experiments.
At the molecular level, SR9009 binds REV-ERBα and REV-ERBβ and alters their repressive activity on target genes. These nuclear receptors help regulate the circadian clock, lipid synthesis, glucose metabolism, and inflammatory pathways. By changing transcription, the compound can shift the timing or magnitude of downstream metabolic processes in model systems. It does not act through androgen receptors or adenosine receptors, which distinguishes it from several substances sold for athletic performance. Whether the same transcriptional changes occur in humans at tolerable exposures remains an open question because controlled human studies are lacking.
Preclinical reports describe effects on exercise endurance, mitochondrial content, and lipid profiles in rodents, but these findings come from specific experimental conditions. Many studies use high doses or delivery methods that may not translate directly to human use. SR9009 has been reported to have low oral bioavailability and a short half-life, which complicates interpretation of oral dosing studies. It is not established as safe or effective for any indication. Literature discussions often separate its pharmacological mechanism from unverified claims made in fitness and supplement markets.
In laboratory settings, SR9009 is commonly identified by its molecular structure and its interaction with REV-ERB receptors. Vendors may list it under synonyms such as Stenabolic or REV-ERB agonist, but those names do not define purity or identity. Analytical confirmation typically uses high-performance liquid chromatography with ultraviolet detection or liquid chromatography–mass spectrometry. A reference standard is needed to compare retention time and mass spectrum, because the compound can be confused with related research chemicals.
Handling practices for SR9009 focus on minimizing degradation and contamination. The solid is generally stored desiccated at or below -20 °C, protected from light and moisture. Stock solutions are often prepared in dimethyl sulfoxide or ethanol, then aliquoted to avoid repeated freeze–thaw cycles. Aqueous solubility is low, so formulations for animal studies may require cosolvents or suspending agents. Personnel should follow institutional chemical safety procedures, because toxicological data for humans are incomplete.
Regulatory status varies by country and intended use. Major drug agencies have not granted marketing authorization for SR9009 as a medicine, and it is not listed as a controlled substance in many jurisdictions. It is often sold as a research chemical, a category that may fall outside pharmaceutical manufacturing rules. Buyers should verify local laws and supplier documentation, including certificates of analysis. The lack of standardized quality controls raises concerns about identity, purity, and actual content in products marketed online.
== Renal Impairment == Dose adjustment is necessary based on the degree of renal function: Mild Renal Impairment (eGFR ≥ 60 mL/min/1.73 m²): No dose adjustment required. Moderate Renal Impairment (eGFR 30–59 mL/min/1.73 m²): Reduce dose to 50 mg once weekly. Severe Renal Impairment or ESRD (eGFR < 30 mL/min/1.73 m² or on dialysis): Reduce dose to 25 mg once weekly, with close monitoring.
== External links == Large+Neutral+Amino+Acid-Transporter+1 at the U.S. National Library of Medicine Medical Subject Headings (MeSH) Amino+Acid+Transport+System+L 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.
== Types of proteomes == While proteome generally refers to the proteome of an organism, multicellular organisms may have very different proteomes in different cells, hence it is important to distinguish proteomes in cells and organisms. A cellular proteome is the collection of proteins found in a particular cell type under a particular set of environmental conditions such as exposure to hormone stimulation. It can also be useful to consider an organism's complete proteome, which can be conceptualized as the complete set of proteins from all of the various cellular proteomes. This is very roughly the protein equivalent of the genome. The term proteome has also been used to refer to the collection of proteins in certain sub-cellular systems, such as organelles. For instance, the mitochondrial proteome may consist of more than 3000 distinct proteins. The proteins in a virus can be called a viral proteome. Usually viral proteomes are predicted from the viral genome but some attempts have been made to determine all the proteins expressed from a virus genome, i.e. the viral proteome. More often, however, virus proteomics analyzes the changes of host proteins upon virus infection, so that in effect two proteomes (of virus and its host) are studied.
==== Depression ==== A 2014 systematic review concluded that vitamin D supplementation does not reduce depressive symptoms overall but may have a moderate benefit for patients with clinically significant depression, though more high-quality studies were determined to be needed.
Sources: en.wikipedia.org
=== Layers === Dinosaur eggshells are divided into one, two, or three layers of distinct ultrastructure. The innermost layer, known as the mammillary layer or the cone layer, is only found in theropod eggs (the prismatic and ornithoid basic types). It is composed of cone-shaped structures called mammillae at the base of each shell unit. Mammillae are the first part of the eggshell to form. Each mammilla forms from crystals radiating outward from an organic core until they touch neighboring mammillae and grow upwards into the next layer. In spherulitic eggs, the eggs of non-theropod dinosaurs, the eggshell units grow upward from their organic cores; the base of each eggshell unit is rounded, but is not a true mammilla because it does not have a distinct ultrastructure from the top of the unit. The second layer is alternately called the prismatic layer, the columnar layer, the continuous layer, the crystalline layer, the cryptoprismatic layer, the palisade layer, the spongy layer, or the single layer. In this layer, the shell units can be distinct, partially fused together, or entirely continuous. In some dinosaur eggs, the prismatic layer exhibits squamatic ultrastructure, where the prismatic structure is obscured by a rough texture resembling lizard skin. Though rare in non-avian dinosaurs, some theropod eggs and most bird eggs have a third layer (known as the external layer) made up of vertical calcite crystals.
One of the more significant examples of the implementation of containment was the United Nations US-led intervention in the Korean War. In June 1950, after years of mutual hostilities, Kim Il Sung's North Korean People's Army invaded South Korea. Stalin had been reluctant to support the invasion but ultimately sent advisers. To Stalin's surprise, the United Nations Security Council backed the defense of South Korea, although the Soviets were then boycotting meetings in protest of the fact that Taiwan (Republic of China), not the People's Republic of China, held a permanent seat on the United Nations Security Council. A UN force of sixteen countries faced North Korea, although 40 percent of troops were South Korean, and about 50 percent were from the United States.
=== Pill mill === A "pill mill" is a clinic that dispenses narcotics to patients without a legitimate medical purpose. This is done at clinics and doctors' offices, where doctors examine patients extremely quickly with a purpose of prescribing painkillers. These clinics often charge an office fee of $200 to $400 and can see up to 60 patients a day, which is very profitable for the clinic. Pill mills are also large suppliers of the illegal painkiller black markets on the streets. Dealers may hire people to go to pill mills to get painkiller prescriptions. There have been attempts to shut down pill mills. 250 pill mills in Florida were shut down in 2015. Since the implementation of pill mill laws and drug monitoring programs in Florida, high-risk patients (defined as those who use both benzodiazepines and opioids, those who have been using high opioid doses for extended periods of time, or "opioid shoppers" that obtain their opioid painkillers from multiple sources) have shown significant reductions in opioid use.
Sources: en.wikipedia.org
In response to the February 1945 Yalta Conference directives, a Polish Provisional Government of National Unity was formed in June 1945 under Soviet auspices; it was soon recognized by the United States and many other countries. The Soviet domination was apparent from the beginning, as prominent leaders of the Polish Underground State were brought to trial in Moscow (the "Trial of the Sixteen" of June 1945). In the immediate post-war years, the emerging communist rule was challenged by opposition groups, including militarily by the so-called "cursed soldiers", of whom thousands perished in armed confrontations or were pursued by the Ministry of Public Security and executed. Such guerillas often pinned their hopes on expectations of an imminent outbreak of World War III and defeat of the Soviet Union. The Polish right-wing insurgency faded after the amnesty of February 1947. The Polish people's referendum of June 1946 was arranged by the communist Polish Workers' Party to legitimize its dominance in Polish politics and claim widespread support for the party's policies. Although the Yalta agreement called for free elections, the Polish legislative election of January 1947 was controlled by the communists. Some democratic and pro-Western elements, led by Stanisław Mikołajczyk, former prime minister-in-exile, participated in the Provisional Government and the 1947 elections, but were ultimately eliminated through electoral fraud, intimidation and violence.
== In culture == The jalapeño is a Mexican chili but was designated by the Texas Legislature as the official "State Pepper of Texas" in 1995. In Mexico, jalapeños are used in many forms such as in salsa, pico de gallo, or grilled jalapeños. Jalapeños were included as food on the Space Shuttle as early as 1982. Guinness World Records recognizes Alfredo Hernandes for the most jalapeños eaten in a minute: 16, on 17 September 2006 at the La Costeña Feel the Heat Challenge in Chicago, Illinois. Patrick Bertoletti holds the Major League Eating jalapeño records at 275 pickled jalapeños in 8 minutes on 1 May 2011, and 191 pickled jalapeños in 6.5 minutes on 16 September 2007 in the 'Short-Form'. Joaquín Guzmán, also known as "El Chapo", the leader of the Sinaloa Cartel, operated a cannery in Guadalajara producing "Comadre Jalapeños" in order to ship cocaine to the US. The official mascot of the 1986 FIFA World Cup was Pique, a jalapeño pepper, characteristic of Mexican cuisine, with a moustache, a Colimote sombrero, and Mexican football team colors. Its name comes from picante, a Spanish word meaning "spicy", and was also a pun on the "PK" abbreviation of the football term penalty kick. Pique is also a common Spanish name. September 5th is recognized as National Jalapeno Day.
=== The beginnings of the Rowett Research Institute === On 1 April 1914, Boyd Orr took charge of a new research institute in Aberdeen, a project of a joint committee for research into animal nutrition of the North of Scotland College of Agriculture and the University of Aberdeen. He had been offered the post on the recommendation of E. P. Cathcart, who had originally been offered the job, but had turned it down in favour of a chair in physiology in London. The joint committee had allocated a budget of £5,000 for capital expenditure and £1,500 for annual running costs. Boyd Orr recognised immediately that these sums were inadequate. Using his experience in his father's business of drawing up plans and estimating costs, he submitted a budget of £50,000 for capital expenditure and £5,000 for annual running costs. Meanwhile, with the £5,000 he had already been allocated he specified a building, not of wood as had been envisaged by the committee, but of granite and designed so that it could serve as a wing of his proposed £50,000 Institute. He accepted the lowest tender of £5,030, and told the contractors to begin work immediately. The committee were not pleased, but had to accept the fait accompli. When war broke out the contractors were told to finish the walls and roof, but to do no more for the time being.
Sources: en.wikipedia.org
The most common approach is liquid chromatography-tandem mass spectrometry, often after extraction from blood, urine, or tissue. Ultraviolet detection and nuclear magnetic resonance spectroscopy are used mainly for reference material characterization. Isotope-labeled internal standards improve accuracy.
Solid material is usually kept at -20 °C, desiccated, and protected from light. Dimethyl sulfoxide stocks should be stored cold and subjected to minimal freeze-thaw cycles. Aqueous solutions are generally less stable and should be prepared fresh when possible.
Legality depends on the country and the intended use. It is not an approved medicine, and some places restrict or ban sales for human consumption. Buyers should verify local rules and product documentation before procurement.
It is a synthetic REV-ERB agonist used mainly in preclinical research. It is not an approved medicine for human use.