This is a working overview of circadian rhythm, written for readers who want more than a one-paragraph summary but less than a textbook.
Reviewed 2026-03-11. Anything still debated is marked as such rather than presented as settled.
At the molecular level, SR9009 binds the ligand-binding domain of REV-ERB and strengthens recruitment of corepressor proteins such as NCoR and HDAC3. This increases repression of target genes, including Bmal1 and other clock-controlled and metabolic genes. In rodent studies, such changes have been linked to altered lipid handling, glucose metabolism, and energy expenditure. The precise chain of events between receptor binding and whole-body effects remains an active area of research. Findings in animals do not automatically translate to humans.
Laboratory studies often administer SR9009 by injection because oral absorption appears poor in rodents. Reported pharmacokinetic properties include rapid metabolism and low systemic exposure after oral dosing. Human pharmacokinetic data are sparse, so absorption, distribution, metabolism, and excretion in people are not well defined. Some research explores related REV-ERB compounds with improved drug-like properties. Regulatory approval for any REV-ERB agonist as a human medicine has not been granted to date.
SR9009 is a synthetic small molecule studied as an agonist of the nuclear receptors REV-ERBα and REV-ERBβ, also called NR1D1 and NR1D2. These receptors help regulate circadian rhythms and metabolic gene programs. The compound was developed for laboratory research, not as an approved therapeutic. Its identity is distinct from steroid hormones and selective androgen receptor modulators. Scientific interest centers on how REV-ERB activation changes gene expression in cells and animal models.
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.
| Property | Value | Notes |
|---|---|---|
| Chemical class | Synthetic small molecule | Studied as a REV-ERB agonist |
| Molecular formula | C20H24ClN3O4S | Reported for the neutral compound |
| Appearance | Off-white to pale yellow solid | Typical research-grade material |
| Solubility | Sparingly soluble in water | Soluble in solvents such as DMSO |
| Common synonyms | SR9009; Stenabolic | Stenabolic is an informal alias |
SR9009 is not approved as a medicine by major regulatory agencies. It is commonly sold as a research chemical, a category that may fall outside customary drug approval and quality rules. In sports, the World Anti-Doping Agency lists SR9009 as a prohibited substance. Athletes who use it can face sanctions if it is detected in a sample. Legal status varies by country, and importation may be restricted. Enforcement practices differ across borders.
Detection of SR9009 in biological samples usually employs liquid chromatography coupled with tandem mass spectrometry. This method can identify the parent compound and sometimes metabolites in urine or blood. Because exposure can be low and clearance may be rapid, sample timing and limits of detection matter. Laboratories validate assays for sensitivity and specificity. Results are interpreted alongside chain-of-custody and quality-control records. Urine is the common matrix for anti-doping analysis, while blood may be used in research settings.
Handling recommendations for SR9009 in a laboratory setting include storing the solid at low temperature, protected from light and moisture. The compound is often dissolved in dimethyl sulfoxide or ethanol for experiments. Solutions should be prepared with appropriate personal protective equipment and disposed of according to local rules. Stability data for long-term storage are limited, so stock solutions are typically kept cold and used within defined periods. Records of preparation date and concentration support reproducibility.
SR9009 is a synthetic small molecule developed as an agonist of the nuclear receptors REV-ERBα (NR1D1) and REV-ERBβ (NR1D2). These receptors help regulate circadian rhythms and metabolic gene expression. In cell and animal studies, SR9009 alters transcription of genes involved in lipid metabolism, inflammation, and mitochondrial function. It is not an approved medicine, and its pharmacological profile in humans remains largely uncharacterized. The compound is frequently discussed in the context of circadian biology and metabolic research rather than clinical use.
Preclinical reports have linked SR9009 to improved endurance and altered energy expenditure in rodents. Such findings have prompted interest in whether REV-ERB activation can influence skeletal muscle metabolism. However, the reported effects depend on dose, route, and experimental model, and replication across laboratories is limited. Human trials have not established comparable outcomes, so claims about exercise performance remain speculative. The absence of controlled human data is a central limitation in interpreting these observations.
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.
Mass popular support and protest meant that these five became known as the Tolpuddle martyrs, and they were eventually pardoned. The population tripled to more than a million migrants over the Australian gold rushes of 1851, and protests broke out against the government's attempt to impose a licence fee for working to search for gold (whether or not gold was found). In 1854, when the fee was £2 for 3 months, strict and brutal enforcement led to the Eureka Stockade at Ballarat, where rebels demanded an end to the fee, democratic representation in the government, and took up arms. Though the stockade was broken, and its leaders killed or arrested and put on trial, juries acquitted all, the gold licence fee was replaced with an export duty, and miners won the right to vote in the Victorian Legislative Assembly. Yet labour rights throughout Australian colonies were scant. Laws were systematically discriminatory, particularly based on gender and race, entrenched in the White Australia policy from the Immigration Restriction Act 1901. The right to organise unions was precarious, without any positive right to take collective action for fair work, and there were no legislative rights to fair wages or job security. Instead, responding to the 1890 Australian maritime dispute, the 1892 Broken Hill miners' strike and others, South Australia, New Zealand, New South Wales, and finally the federation sought to replace industrial conflict and strikes with a system of arbitration.
Subsequent transfusions were successful with patients of James Young Simpson, after whom the Simpson Memorial Maternity Pavilion in Edinburgh was named. Various isolated reports of successful transfusions emerged towards the end of the 19th century. The largest series of early successful transfusions took place at the Edinburgh Royal Infirmary between 1885 and 1892. Edinburgh later became the home of the first blood donation and blood transfusion services.
cell The basic structural and functional unit of which all living organisms are composed, essentially a self-replicating ball of protoplasm surrounded by a surface membrane which separates the interior from the external environment, thus providing a protected space in which the carefully controlled chemical reactions necessary to sustain biological processes can be carried out unperturbed. Unicellular organisms are composed of a single autonomous cell, whereas multicellular organisms consist of numerous cells cooperating together, with individual cells more or less specialized or differentiated to serve particular functions. Cells vary widely in size, shape, and substructure, particularly between prokaryotes and eukaryotes. The typical cell is microscopic, averaging 1 to 20 micrometres (μm) in diameter, though they may range in size from 0.1 μm to more than 20 centimetres in diameter for the eggs laid by some birds and reptiles, which are highly specialized single-celled ova.
Sources: en.wikipedia.org
== Symptoms and signs == In terms of the signs/symptoms of Fukuyama congenital muscular dystrophy it is characterized by a decrease in skeletal muscle tone as well as an impairment in brain and eye development. Initial symptoms of FCMD present in early infancy as decreased ability to feed. Marked differences in facial appearance occur due to decreased muscle tone. Further characteristics include:
Their isotopic signatures indicate that they grew up in a temperate environment consuming mostly C3 plants, but some C4 The study argued that these individuals were from the Indian Ocean area. It also suggested that these individuals were Muslims. It argued that stable isotopic analysis of burials, combined with historical and archaeological data were an effective way of investigating the migrations forced by the African Slave Trade, as well as the emergence of the underclass and working class in the Old World.
When El Niño conditions last for many months, extensive ocean warming and the reduction in easterly trade winds limits upwelling of cold nutrient-rich deep water, and its economic effect on local fishing for an international market can be serious. Developing countries that depend on their own agriculture and fishing, particularly those bordering the Pacific Ocean, are usually most affected by El Niño conditions. In this phase of the Oscillation, the pool of warm water in the Pacific near South America is often at its warmest in late December. The 2023 El Niño also disrupted weather patterns globally, with drought reducing maize production by up to 70% in some of Zimbabwe, Zambia and Malawi. The reduced harvests forced countries to declare states of disaster and appeal for international assistance to prevent widespread hunger. It also brought excessive rainfall to East Africa, causing flooding that destroyed crops and infrastructure in areas still recovering from consecutive years of drought.
Sources: en.wikipedia.org
SR9009 is a synthetic research compound that activates the REV-ERBα and REV-ERBβ nuclear receptors. It is not an approved drug and has no established human therapeutic use. Most published biological data come from cell and rodent studies.
No. SR9009 is frequently mislabeled as a SARM in online discussions, but it does not target androgen receptors. Its known mechanism involves REV-ERB nuclear receptors and circadian-metabolic gene regulation.
Human clinical data are very limited. There is no approved human use, and safety and efficacy in people are not established. Most evidence comes from preclinical models, so effects observed in animals may not apply to humans.
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.