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.
Updated 2025-11-20. Numbers and descriptions here follow the published literature rather than marketing material.
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.
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.
Identity and purity of SR9009 samples are usually checked with chromatographic and spectrometric methods. High-performance liquid chromatography can separate the compound from related impurities, while mass spectrometry provides molecular mass confirmation. Nuclear magnetic resonance spectroscopy may be used for structural verification in research settings. No single method proves biological activity, and certificates of analysis should be reviewed alongside raw data. Independent testing is often needed because online products vary widely.
SR9009 stability depends on temperature, moisture, light, and solvent. Solid material is generally kept cool and dry, while solutions may require protection from repeated warming and cooling. Degradation can appear as color changes, precipitate, or new chromatographic peaks. Researchers should follow supplier instructions and their own stability data. Long-term storage conditions for human use have not been established because the compound lacks approved clinical formulation.
SR9009 is supplied as a solid research chemical, often in milligram quantities. Laboratories typically weigh it in a controlled environment because fine powders can disperse. Stock solutions are commonly prepared in dimethyl sulfoxide and stored in small aliquots to reduce freeze-thaw cycles. Personal protective equipment and chemical fume hoods are standard when handling unknown or potent compounds. These practices address laboratory safety rather than human use.
| Property | Value | Notes |
|---|---|---|
| Chemical class | Synthetic REV-ERB agonist | Binds REV-ERBα and REV-ERBβ in preclinical models |
| Molecular formula | C20H24ClN3O4S | Reported for the parent compound |
| CAS Registry Number | 1379686-30-2 | Common identifier in chemical databases |
| Appearance | Off-white to pale yellow solid | Typical research chemical solid |
| Solubility | Soluble in DMSO and ethanol; low in water | Class: small organic molecule |
Analytical methods for SR9009 typically rely on liquid chromatography coupled with tandem mass spectrometry. The technique can separate the parent compound from related substances and detect low concentrations in biological matrices. Urine and blood are common samples in anti-doping testing, while in vitro studies may use cell culture media. Rapid metabolism and low expected concentrations make method validation important for reliable identification. Exact metabolite patterns can vary by species and are not fully mapped.
Regulatory treatment of SR9009 reflects its investigational status. The compound has no approved human therapeutic indication, and sports authorities prohibit its use. It appears on anti-doping lists as a non-approved substance or metabolic modulator, depending on the list version. Products sold online as research chemicals are not quality-controlled medicines, so their identity and purity can differ from the label. Such products may also contain unlisted compounds, which complicates both testing and safety assessment.
=== Fatigue === Fatigue is a common symptom of fibromyalgia. Patients may experience physical or mental fatigue. Physical fatigue can present as a feeling of exhaustion after exercise or limitation in daily activities. Fibromyalgia fatigue can range from feeling mildly tired to flu-like exhaustion. Severe fatigue may come on suddenly, making it difficult to be active at all. The impact of fatigue can be severe and pose more of a problem than the pain. Fatigue is a complicated, multifactorial, and vexing symptom that is highly prevalent (76%) and stubbornly persistent, as evidenced by longitudinal studies over 5 years. Fatigue does not improve with sleep or rest. Medication seems to have little impact on FM fatigue.
== External links == Food for Thought: Mushrooming Concerns "Science News Online" article on T. flavovirens (T. equestre). Tricholoma equestre poisoning "About Health Canada" article on Tricholoma equestre poisoning. Recent Poisonings from Edible Mushrooms! A report on a few new kinds of mushroom poisoning. Riddarmusseronen kan vara giftig Swedish article on T. flavovirens and its toxicity. Matportalen: Matsoppen som ble giftsopp Norwegian article on T. equestre.
The amendments required union leaders to file affidavits with the United States Department of Labor declaring that they were not supporters of the Communist Party and had no relationship with any organization seeking the "overthrow of the United States government by force or by any illegal or unconstitutional means" as a condition to participating in NLRB proceedings. Just over a year after Taft–Hartley passed, 81,000 union officers from nearly 120 unions had filed the required affidavits. This provision was at first upheld in the 1950 Supreme Court decision American Communications Ass'n v. Douds, but in 1965 in United States v. Brown, the Supreme Court held that this provision was an unconstitutional bill of attainder.
In 2005, Neptune Resources NL, a mineral exploration company, applied for and was granted 35,000 km2 of exploration rights over the Kermadec Arc in New Zealand's Exclusive Economic Zone to explore for seafloor massive sulfide deposits, a potential new source of lead-zinc-copper sulfides formed from modern hydrothermal vent fields. The discovery of a vent in the Pacific Ocean offshore of Costa Rica, named the Medusa hydrothermal vent field (after the serpent-haired Medusa of Greek mythology), was announced in April 2007. The Ashadze hydrothermal field (13°N on the Mid-Atlantic Ridge, elevation -4200 m) was the deepest known high-temperature hydrothermal field until 2010, when a hydrothermal plume emanating from the Beebe site (18°33′N 81°43′W, elevation -5000 m) was detected by a group of scientists from NASA Jet Propulsion Laboratory and Woods Hole Oceanographic Institution. This site is located on the 110 km long, ultraslow spreading Mid-Cayman Rise within the Cayman Trough. In early 2013, the deepest known hydrothermal vents were discovered in the Caribbean Sea at a depth of almost 5,000 metres (16,000 ft). Oceanographers are studying the volcanoes and hydrothermal vents of the Juan de Fuca mid ocean ridge where tectonic plates are moving away from each other. Hydrothermal vents and other geothermal manifestations are currently being explored in the Bahía de Concepción, Baja California Sur, Mexico.
Sources: en.wikipedia.org
== Signs and symptoms == Rheumatoid arthritis (RA) is a chronic autoimmune disorder that can affect multiple organ systems. It mainly affects fluid filled connections between joints (synovial joints), causing inflammation, pain, and stiffness in the joints. RA also affects other organs in 20–40% of people. RA typically develops slowly and affects both sides of the body. Systemic symptoms such as fatigue, low-grade fevers and weight loss are also seen in RA.
=== Funerary terraces === Two funerary enclosures were discovered north of the voie d'Italie. The northernmost one was destroyed in 1973 to make way for the Centre Bourse. Each rectangular enclosure has an area of approximately 100 m2 (1,100 sq ft). They were in fact terraces intended to be seen from the voie d'Italie. The preserved enclosure is decorated with alternating metopes and triglyphs which rest on a plinth. In the center of this terrace a square-shaped plinth was discovered carved from large white limestone: it might have been the base of an altar or statue. The enclosures were built at the beginning of the 4th century BC. The excavations have revealed several cremations carried out in situ — nineteen in the northern enclosure and six next to the monument with triglyphs. The remains were recovered; they were found in lead, ceramic or bronze urns, which were then placed within stone boxes and arranged in a pit of funerary terraces. Some of these urns are exhibited at the Marseille History Museum. All the tombs date back to the 4th century BC, except for one cremation which might have occurred in the 3rd century BC. At the beginning of the 2nd century, the use of these funerary terraces was abandoned completely and the site covered up with earth.
Dermal and subcutaneous growths result from (1) reactive or neoplastic proliferation of cellular components of the dermis or subcutaneous tissue, or (2) neoplasms invading or aberrantly present in the dermis.
Sources: en.wikipedia.org
Industrial BioTest Labs (IBT) was the most notable whistleblower case where thousands of safety tests for chemical manufacturers were either falsely claimed to have been performed or were of such poor quality that police investigators could not determine the extent of the work completed, despite superficially delivering test results as specified in their contracts with the manufacturers. IBT, a contract laboratory based in Northbrook, Illinois, conducted research for the United States government and various chemical and pharmaceutical companies, both from the U.S. and abroad, and submitted toxicology data to several federal agencies, covering a wide range of products including drugs, insecticides, herbicides, food additives, pesticides, cosmetics, and cleaning products. These issues were aired in hearings at the US Congress, which pressured the FDA to propose draft Regulations on GLP on November 19, 1976, and establishment of the Final Rule in June 1979 which became effective on June 20, 1979. Proposed amendments were introduced on October 29, 1984. The GLP amendment Final Rule was published on September 4, 1987 and became effective on October 5, 1987. Many of the fraudulent safety data concerned chemicals overseen by the new Environmental Protection Agency (EPA), so their GLP rule was developed simultaneously with FDA, the EPA issuing its draft GLP regulations in 1979 and 1980, publishing the Final Rules in two separate parts (40 CFR 160 and 40 CFR 792) in 1983.
Glucagon-like peptide-1 (GLP-1) is a 30- or 31-amino-acid-long peptide hormone deriving from tissue-specific posttranslational processing of the proglucagon peptide. It is produced and secreted by intestinal enteroendocrine L-cells and certain neurons within the nucleus of the solitary tract in the brainstem upon food consumption. The initial product GLP-1 (1–37) is susceptible to amidation and proteolytic cleavage, which gives rise to the two truncated and equipotent biologically active forms, GLP-1 (7–36) amide and GLP-1 (7–37). Active GLP-1 protein secondary structure includes two α-helices from amino acid position 13–20 and 24–35 separated by a linker region. Alongside glucose-dependent insulinotropic peptide (GIP), GLP-1 is an incretin; thus, it has the ability to decrease blood sugar levels in a glucose-dependent manner by enhancing the secretion of insulin. Beside the insulinotropic effects, GLP-1 has been associated with numerous regulatory and protective effects. Unlike GIP, the action of GLP-1 is preserved in patients with type 2 diabetes. Glucagon-like peptide-1 receptor agonists gained approval as drugs to treat diabetes and obesity starting in the 2000s. Endogenous GLP-1 is rapidly degraded primarily by dipeptidyl peptidase-4 (DPP-4), as well as neutral endopeptidase 24.11 (NEP 24.11) and renal clearance, resulting in a half-life of approximately 2 minutes. Consequently, only 10–15% of GLP-1 reaches circulation intact, leading to fasting plasma levels of only 0–15 pmol/L.
=== Tetracyclic antidepressants === Mirtazapine has demonstrated anxiolytic effect comparable to SSRIs while rarely causing or exacerbating anxiety. Mirtazapine's anxiety reduction tends to occur significantly faster than SSRIs.
Sources: en.wikipedia.org
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.
No. It is a synthetic ligand that binds nuclear receptors, not a steroid or peptide hormone. Its activity depends on receptor binding rather than endocrine secretion.
Clinical evidence is limited. Most published data come from cell and animal experiments. Human safety and efficacy remain uncertain.
Laboratories commonly use liquid chromatography coupled with mass spectrometry to detect SR9009. The method can identify the compound and estimate concentration in a sample. Detection limits depend on the matrix and instrument.