freeze-thaw raises a handful of sensible questions. This page answers them in order, starting with the fundamentals and moving to applications.
This page was last updated on 2025-07-24 and is reviewed periodically as new material appears.
Laboratory samples of SR9009 are typically handled as research chemicals rather than pharmaceuticals. Suppliers usually state that the material is for research use only and not for human or veterinary administration. Storage recommendations generally call for a freezer at approximately −20 °C, protection from light, and a desiccated environment. The solid is often described as a white to off-white powder. Solubility is commonly reported in organic solvents such as dimethyl sulfoxide and ethanol, with low solubility in water.
Analytical identification and purity assessment often use high-performance liquid chromatography with ultraviolet detection or mass spectrometry. Liquid chromatography–tandem mass spectrometry is used to detect and quantify SR9009 in biological matrices, including urine and blood, for anti-doping or pharmacokinetic studies. Nuclear magnetic resonance spectroscopy can confirm molecular structure. Stability depends on form and storage: the solid is generally more stable than solutions, and repeated freeze–thaw cycles may degrade samples. Purity is typically reported as a percentage from a certificate of analysis.
Regulatory treatment of SR9009 varies by country and context. It is not approved as a therapeutic drug by agencies such as the United States Food and Drug Administration or the European Medicines Agency. Sports authorities list it as a prohibited substance; the World Anti-Doping Agency classifies it among hormone and metabolic modulators. Legal status for personal possession or sale differs across jurisdictions, and some countries may restrict it under analog or research chemical laws. Buyers who seek verified material often rely on independent laboratory testing because online product labels may not match contents.
SR9009 is a synthetic small molecule studied as an agonist of the nuclear receptors REV-ERBα and REV-ERBβ. These receptors help regulate circadian rhythms, lipid metabolism, and inflammatory gene expression. In cell and animal experiments, SR9009 alters transcription of clock-controlled genes and metabolic pathways. The compound is not a hormone and does not resemble classical steroid structures. Its activity depends on binding to the ligand-binding domain of REV-ERB, where it can modify corepressor recruitment.
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 |
|---|---|---|
| Appearance | White to off-white powder | Common supplier description |
| Solubility | Soluble in DMSO and ethanol | Low solubility in water |
| Typical storage | −20 °C, desiccated, dark | For research samples |
| Analytical method | LC-MS/MS | Used for detection and quantification |
| Regulatory status | Prohibited in sport | WADA metabolic modulator class |
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.
Laboratory identification of SR9009 typically relies on chromatographic separation coupled to mass spectrometry, often with ultraviolet detection as a secondary check. Nuclear magnetic resonance spectroscopy can confirm molecular structure when a reference standard is available. Because many suppliers sell the compound as a research chemical, independent identity testing is important for experimental reproducibility. A single retention time is not sufficient proof of identity, especially when related compounds may be present. Purity assessments usually report a percentage based on area normalization.
SR9009 is generally described as poorly soluble in water and more soluble in organic solvents such as dimethyl sulfoxide and ethanol. Stock solutions are commonly prepared in an organic solvent before dilution into an aqueous buffer or vehicle. Precipitation can occur if the organic fraction is reduced too quickly or if the final concentration exceeds the compound's solubility limit. Sonication or gentle warming may aid dissolution in some protocols, but excessive heat can promote degradation. Container material and pH can also influence observed solubility.
For long-term storage, SR9009 is typically kept as a solid at low temperature, protected from moisture and light. Desiccated conditions limit hydrolysis, while opaque containers reduce photochemical breakdown. Solutions are less stable than solids and are often stored frozen in aliquots to avoid repeated freeze-thaw cycles. Stability data are not standardized across all suppliers, so users should rely on certificate-of-analysis information when available. Degradation may appear as color change, precipitate, or decreased chromatographic purity.
== Structure == The activin and inhibin protein complexes are both dimeric in structure, and, in each complex, the two monomers are linked to one another by a single disulfide bond. In addition, both complexes are derived from the same family of related genes and proteins but differ in their subunit composition. Below is a list of the most common inhibin and activin complexes and their subunit composition:
In December 2013, a Formal Dispute Resolution was filed, which contained the requirements of the FDA for further studies. These include two studies in healthy subjects to determine if flibanserin impairs their ability to drive, and to determine if it interferes with other biochemical pathways. The Agency agreed to call a new Advisory Committee meeting to consider whether the risk-benefit ratio of flibanserin was favorable after this additional data was obtained. In June 2015, the US FDA Advisory Committee, which includes the Bone, Reproductive, and Urologic Drugs Advisory Committee (BRUDAC) and the Drug Safety and Risk Management Advisory Committee (DSRM), recommended approval of the drug by 18–6, with the proviso that measures be taken to inform women of the drug's side effects. On 18 August 2015, the FDA approved Addyi (flibanserin) for the treatment of premenopausal women with low sexual desire that causes personal distress or relationship difficulties. The approval specified that flibanserin should not be used to treat low sexual desire caused by co-existing psychiatric or medical problems; low sexual desire caused by problems in the relationship; or low sexual desire due to medication side effects. As of August 2015, Sprout Pharmaceuticals had not yet made an application to the European Medicines Agency for a marketing authorization.
=== 1974 === February 7: Grenada becomes independent from the UK. April 25: Portuguese Armed Forces revolt against the authoritarian regime of Estado Novo. Fascism in Portugal officially ended, and Spain became the last and only fascist country that still stood at the time. June 26: NATO holds a summit in Brussels, the first one since 1957 to be held. June 28: The Moscow Summit begins. July 20: Turkey invaded Cyprus after a coup d'état conducted by the Greek junta. July 24: The Greek Junta gives up its power after the Cypriot Junta government of the 1974 Cypriot coup d'état fell on July 23. This initiated a new period of Greek history known as Metapolitefsi, which led to the restoration of democracy in Greece. August 9: Gerald Ford becomes President of the United States upon the resignation of Nixon. September 4: The United States and East Germany begin diplomatic relations. September 12: The pro-Western monarch of Ethiopia, Haile Selassie, is ousted by a Marxist military junta known as the Derg. November 24: The SALT II Agreement is drafted at the Vladivostok Summit Meeting on Arms Control. December 8: Following a referendum, Greece voted to confirm their abolition of their monarchy the previous year.
Sources: en.wikipedia.org
== Bibliography == Szilágyi, Miklós (1988). Electron and ion optics. New York: Plenum Press. ISBN 978-0-306-42717-6. Septier, Albert L. (1980). Applied charged particle optics. Boston: Academic Press. ISBN 978-0-12-014574-4. International vocabulary of basic and general terms in metrology =: Vocabulaire international des termes fondamentaux et généraux de métrologie. International Organization for Standardization. 1993. ISBN 978-92-67-01075-5. IUPAP Red Book SUNAMCO 87-1 "Symbols, Units, Nomenclature and Fundamental Constants in Physics" (does not have an online version) Symbols Units and Nomenclature in Physics IUPAP-25, E.R. Cohen & P. Giacomo, Physics 146A (1987) 1–68
The CHMP recommended approval in April 2016, but the FDA rejected the application in November for having insufficient data in November 2016. The drug was authorized in the European Union in May 2016. Germany was the first country where migalastat was launched.
== State-affiliated media label controversy == On April 5, 2023, the Twitter account for National Public Radio (NPR) received a label that it was "state-affiliated", despite the fact it receives less than 1% of its funding from the government; Voice of America (VOA), a state-affiliated media arm of the United States, did not receive a label. NPR CEO John Lansing condemned Twitter for the labeling. A similar label was added to Public Broadcasting Station's (PBS) Twitter account on April 8. According to PBS, the broadcaster has no intention to use its Twitter account after receiving the label. NPR announced it had quit Twitter on April 12 after the label was changed to "government-affiliated". The decision was a reversal of the company's previous treatment towards NPR, which it cited as an example of a public news organization that is not state-affiliated. The British Broadcasting Corporation (BBC) also received a government-affiliated label, but appealed to Musk. The Canadian Broadcasting Corporation (CBC) received a label stating it was "69% government-funded", in apparent reference to the sex position, after Conservative Party of Canada leader Pierre Poilievre told Musk to apply the label. The CBC is 66% government-funded, and stopped tweeting after the incident. On April 22, Twitter dropped the state-affiliated and government-affiliated labels entirely, including for Russia's RT and China's Xinhua News and China Global Television Network (CGTN). According to Musk, the idea to drop the labels came from author Walter Isaacson.
Features of the Early Lesion: Accentuation of features of the initial lesion, such as the considerably greater loss of collagen Accumulation of lymphocytes subjacent to junctional epithelium Cytopathic alterations in resident fibroblasts Preliminary proliferation of basal cells of junctional epithelium
Sources: en.wikipedia.org
Legality depends on the country and the intended use. In many places it is sold as a research chemical, but sports and medicine regulations restrict it.
Detection commonly uses liquid chromatography–tandem mass spectrometry. This method can identify the compound in urine or blood at low concentrations.
Typical guidance is −20 °C, dry, and protected from light. Solutions should be aliquoted and limited freeze–thaw cycles should be used.
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.