storage stability 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 2026-05-26. Numbers and descriptions here follow the published literature rather than marketing material.
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.
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.
| 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 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.
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.
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.
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.
=== Labour === Tea production in Kenya, Malawi, Rwanda, Tanzania, and Uganda uses child labour, according to the U.S. Department of Labor's List of Goods Produced by Child Labor or Forced Labor. Workers who pick and pack tea on plantations in developing countries can face harsh working conditions and may earn below the living wage. In countries such as Bangladesh, trade unions such as the Bangladesh Tea Workers Women's Forum, led by Gita Rani Kanu, have emerged to campaign for better working conditions for tea workers.
== External links == Edward Calvin Kendall Biography Edward Calvin Kendall on Nobelprize.org "The Lasker Foundation – Clinical Medical Research Award". Retrieved June 6, 2008. "The Passano Foundation, Inc". Retrieved June 6, 2008. [1]
== Occurrence and nomenclature == The term nucleic acid is the overall name for DNA and RNA, members of a family of biopolymers, and is a type of polynucleotide. Nucleic acids were named for their initial discovery within the nucleus, and for the presence of phosphate groups (related to phosphoric acid). Although first discovered within the nucleus of eukaryotic cells, nucleic acids are now known to be found in all life forms including within bacteria, archaea, mitochondria, chloroplasts, and viruses (There is debate as to whether viruses are living or non-living). All living cells contain both DNA and RNA (except some cells such as mature red blood cells), while viruses contain either DNA or RNA, but usually not both. The basic component of biological nucleic acids is the nucleotide, each of which contains a pentose sugar (ribose or deoxyribose), a phosphate group, and a nucleobase. Nucleic acids are also generated within the laboratory, through the use of enzymes (DNA and RNA polymerases) and by solid-phase chemical synthesis.
=== Act 1 === W.P. Inman, a Confederate soldier wounded at the Battle of Petersburg, decides to desert from the Confederate Army and return home to Ada Monroe, his beloved who lives at Black Cove Farm, in North Carolina. Inman is aware of the Home Guard, which hunts down deserters from the Confederate Army. The leader of the local Home Guard is Teague, who resorts to such practices as burying deserters alive. On his journey home, Inman meets Solomon Veasey, whom he stops from committing murder. Meanwhile, Ada, once privileged, leads a life of material desperation. Ada meets Ruby, a mountain woman who teaches Ada about hunting and surviving. Inman encounters Veasey again, near a river whilst fleeing the Home Guard, and bargains with him for passage across the river. However, their vessel capsizes and the two drift down the river. The next morning, Lila and her three sisters see Inman and Veasey. Lila's husband drugs the two men before giving them up to the Home Guard. Inman and Veasey are put on a chain gang of deserters. Back at Black Cove Farm, Ruby finds her estranged father, Stobrod, a fiddler. Strobod is trying to steal food. Ruby wants nothing to do with her father, although he asserts that he has reformed his ways. Teague approaches, and Ruby hides her father. She later orders her father to stay away from her. Inman starts an insurrection among the chain gang. The guards shoot the entire chain gang, with a wounded Inman as the only survivor, chained to six dead prisoners. He relives the day he bid Ada farewell, when he thought that the war would last but six months.
Sources: en.wikipedia.org
Blood clotting is measured using standard tests, e.g. prothrombin time, partial thromboplastin time, thrombin time, and/or reptilase time. Low fibrinogen levels and dysfunctional fibrinogens usually prolong these times, whereas the lack of fibrinogen (i.e. afibrinogenemia) renders these times infinitely prolonged. Fibrinogen levels are measured in the plasma isolated from venous blood by immunoassays, or through clotting assays such as the Clauss fibrinogen assay or prothrombin based methods. Normal levels being about 1.5-3 g/L, depending on the method used. These levels are normal in dysfibrinogenemia (i.e. 1.5-3 g/L), decreased in hypofibrinogenemia and hypodysfibrinogenemia (i.e. <1.5 g/L), and absent (i.e. <0.02 g/L) in afibrinogenemia. Functional levels of fibrinogen are measured on plasma induced to clot. The levels of clotted fibrinogen in this test should be decreased in hypofibrinogenemia, hypodysfibrinogenemia, and dysfibrinogenemia and undetectable in afibrinogenemia. Functional fibrinogen/antigenic fibrinogen levels are <0.7 g/L in hypofibrinogenemia, hypodysfibrinogenemia, and dysfibrogenemia, and not applicable in afibrinogenemia. Fibrinogen analysis can also be tested on whole-blood samples by thromboelastometry. This analysis investigates the interaction of coagulation factors, their inhibitors, anticoagulant drugs, and blood cells (specifically, platelets), during clotting and subsequent fibrinolysis as it occurs in whole blood.
Based on crystallography data of homologous NADP-dependent malic enzymes of mammalian origin, a 3D model for C4 pathway NADP-ME in plants has been developed, identifying the key residues involved in substrate-binding or catalysis. Dinucleotide binding involves two glycine-rich GXGXXG motifs, a hydrophobic groove involving at least six amino acid residues, and a negatively charged residue at the end of the βB-strand. The primary sequence of the first motif, 240GLGDLG245, is a consensus marker for phosphate binding, evidencing involvement with NADP binding, while the other glycine rich motif adopts a classical Rossmann fold—also a typical marker for NADP cofactor binding. Mutagenesis experiments in maize NADP-ME have supported the current model. Valine substitution for glycine in either motif region rendered the enzyme completely inactive while spectral analysis indicated no major changes from wild-type form. The data is suggestive of direct impairment at a key residue involved in binding or catalysis rather than an inter-domain residue influencing conformational stability. Additionally, a key arginine residue at site 237 has been shown to interact both with malate and NADP+ substrates, forming key favorable electrostatic interactions to the negatively charged carboxylic-acid and phosphate group respectively. Elucidation of whether the residue plays a role in substrate binding or substrate positioning for catalysis has yet to be determined.
The term "Holstein" derives from Old Saxon Holseta Land (Holz means wood in modern Standardized German; holt is a now-archaic English word for woods.) Originally, the term referred to the central of the three Saxon tribes north of the River Elbe: Tedmarsgoi (Dithmarschen), Holstein, and Sturmarii (Stormarn). The area inhabited by the tribe of the Holsts lay between the Stör River and Hamburg; after Christianization, their main church was in Schenefeld. Saxon Holstein became a part of the Holy Roman Empire after Charlemagne's Saxon campaigns in the late eighth century. Beginning in 811, the northern border of Holstein (and thus of the Empire) was the River Eider. The term "Schleswig" originally referred to the city of Schleswig. The word Schleswig is a German transliteration of the Danish word Slesvig, which consists of two words: Schlei and vig. The Schlei refers to the river at which the city lies, and vig means "inlet" or bay. Schleswig, therefore, means (in Danish): "The bay at the river Schlei". The Schlei is known as Slien in Danish and is believed to have been used only for the inner Slien (the Great and Little Bay near the city of Schleswig). The word is thought to be related to Slæ, which means reeds and aquatic plants found in this area. The Duchy of Schleswig, or Southern Jutland, was originally an integral part of Denmark, but in medieval times was established as a fief under the control of the Kingdom of Denmark, having the same relationship with the Danish Crown as, for example, Brandenburg or Bavaria had with the Holy Roman Emperor.
In 1992, Hooters sponsored NASCAR driver Alan Kulwicki as he won the Winston Cup Championship, beating Bill Elliott by ten points, the closest margin in NASCAR prior to The Chase era. On April 1, 1993, Kulwicki, along with several others including Hooters Chairman Bob Brooks's son Mark, were killed in a plane crash near Bristol, Tennessee. They were flying back to the track for Sunday's race after making a sponsor appearance at a Hooters in Knoxville, Tennessee. Hooters remained in the sport, sponsoring drivers like Loy Allen Jr., Rick Mast and Brett Bodine before ending their involvement in 2003. The restaurant returned to NASCAR in 2007 to sponsor a Craftsman Truck Series team led by Jason White, Derrike Cope and Brad Keselowski. Six years later, Hooters sponsored Nationwide Series driver Nelson Piquet Jr.'s car. For the 2016 Bojangles' Southern 500 at Darlington Raceway, Hooters made a comeback in the Cup Series with a one-off paint scheme for Greg Biffle. Hooters most recently sponsored the No. 9 of Chase Elliott from 2017 to 2024. Hooters has sponsored the Major League Eating-sanctioned "Hooters Worldwide Wing Eating Championship" since 2012. Hooters has also licensed its name for the Hooters Road Trip PlayStation racing game. Furthermore, Hooters licensed the Hooters Calendar for Hooters Calendar Girl, a mobile wallpaper application, and Hooters Calendar Girl Tubin', a mobile game, both by Oasys Mobile. It was also one of several real world brands that appeared in the 2011 video game Homefront.
Bolognia, Jean L.; et al. (2007). Dermatology. St. Louis: Mosby. ISBN 978-1-4160-2999-1. James, William D.; et al. (2006). Andrews' Diseases of the Skin: Clinical Dermatology. Saunders Elsevier. ISBN 0-7216-2921-0.
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 compound investigated as an agonist of the nuclear receptors REV-ERBα and REV-ERBβ. It is used in preclinical research on circadian rhythm and metabolism. It is not an approved drug.