A practical reference on circadian clock: what it is, how it behaves, what the literature reports, and where the honest uncertainties sit.
Reviewed 2026-03-16. Anything still debated is marked as such rather than presented as settled.
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.
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.
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.
| 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 |
Pharmacokinetic data for SR9009 are limited in published literature. Some reports indicate low oral bioavailability and rapid clearance in animals, which complicates interpretation of exposure and effect. Researchers often use injected routes in preclinical work to achieve measurable systemic levels. Analytical studies rely on mass spectrometry to detect the parent compound and its metabolites. Questions about tissue distribution, active metabolites, and long-term consequences remain open. Species differences in metabolism can affect observed half-life and target engagement.
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 and metabolic gene expression. In laboratory experiments, SR9009 binds these receptors and alters transcription of genes involved in lipid handling, glucose metabolism, and mitochondrial function. It is not a naturally occurring compound and has no approved therapeutic use. Research interest stems from its ability to modify energy metabolism in cells and animal models.
In rodent studies, SR9009 has been reported to increase mitochondrial content in skeletal muscle and improve exercise endurance under some conditions. These findings led to popular descriptions such as an exercise mimetic, although that term oversimplifies the biology. Effects vary by dose, timing, tissue, and model. The compound's influence on circadian pathways means that time of administration can matter in experiments. Whether similar metabolic changes occur in humans remains largely unexplored in controlled published trials.
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.
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.
Laboratory samples of SR9009 are typically supplied as a white to off-white powder. The compound dissolves readily in organic solvents such as dimethyl sulfoxide and ethanol, while its solubility in water is low. Because of this solubility profile, researchers often prepare concentrated stock solutions in an organic solvent before diluting them into aqueous assay buffers. Light exposure, moisture, and repeated freeze-thaw cycles can degrade many small molecules, so handling procedures usually aim to minimize these factors. Purity is commonly checked before use.
Storage conditions for research-grade SR9009 generally involve a freezer at approximately minus twenty degrees Celsius, sometimes lower for long-term preservation. Containers should remain tightly closed and protected from light. Desiccants may be used to limit moisture uptake. Solutions are often stored in aliquots to avoid repeated warming and cooling. Stability data for the compound under various conditions are limited, so laboratories typically follow supplier recommendations and verify performance through periodic analytical checks rather than assuming indefinite stability.
Identity and purity testing for SR9009 commonly uses liquid chromatography coupled with tandem mass spectrometry. This method separates the compound from matrix components and detects it by mass-to-charge transitions, providing sensitive and specific confirmation. Nuclear magnetic resonance spectroscopy can support structural identification, while high-performance liquid chromatography with ultraviolet detection may estimate purity. Because online products labeled as SR9009 may contain other substances or no active compound at all, independent verification is important in research settings. Certificates of analysis are useful but not a substitute for in-house testing.
Schirwan. Dazu gehören die Knüpforte Kuba, der Ordutsch Konakgent der Perepedil mit seinen Widderhörnern und dem einfachen weißen Shirazi der Akstafa mit den sagenhaften Vögeln mit überlangen Schwanzfedern der Surahani in Läuferformat die Kasaken der Lori Pampak und der Fachralo mit den unverwechselbaren Medaillons der Adlerkasak Tschelaberd, der bekannteste Kaukase der Wolkenband-Kasak (Karabach-Chondsoresk) mit den geschwungenen Wolkenbändern der Armenier und seine Rosenbouquets der Schildkasak wirkt archaisch und kriegerisch. Meist haben diese Stücke einen doppelten bis dreifachen braunen Shirazi.
Afghanistan ist als großes Teppichknüpfland besonders durch seine gleichnamigen Teppiche bekannt geworden. Für diese Orientteppiche ist eine tiefrote bis hin zu braun tendierende Grundfarbe typisch. Die Muster, oft dunkelblau und schwarz, sind streng geometrisch geordnet und zeigen Oktogone und wechselnde Füllmotive und vielfach gegliederte Bordüren. Einsatz kräftiger, derber Wolle als Knüpfmaterial für den Flor, in Kette und Schuss z. T. Ziegenhaar, bei neueren Stücken aus Manufakturen gelegentlich Baumwolle.
Afghanistan kann als der Prototyp eines Durchgangslandes gelten. Seit frühgeschichtlicher Zeit kreuzen sich hier die Wege der Völkerwanderungen, Eroberer, Händler und Missionare der unterschiedlichsten Religionen. Die Eroberung durch die Araber begann im 7. Jahrhundert. Kabul und der Osten wurden im 10. Jahrhundert islamisiert, 977–1187 war Afghanistan Kern des Reiches der turkstämmigen Ghasnawiden, denen die kurzlebige Dynastie der Ghuriden folgte. Im 13. Jahrhundert fielen die Mongolen in Afghanistan ein und im 14. Jahrhundert die Eroberung durch Timur Leng. Im 16. und 17. Jahrhundert war es zwischen Persien und dem indischen Mogulreich geteilt. Anfang des 18. Jahrhunderts erhoben sich afghanische Stämme gegen die Safawiden. 1747 übernahm Ahmad Schah Durrani (1747–73) das unabhängige afghanische Emirat und begründet damit die afghanische nationale Geschichte. Die Durrani-Dynastie blieb bis ins 20. Jahrhundert hinein an der Macht. Von Kandahar aus, später von Kabul, bildete das Emirat bis 1810 ein einheitliches Staatsgebilde. Dann zerfiel es mit dem Tod von Mahmud Schah in einzelne Khanate. Bereits im späten 18. Jahrhundert hatten sich Belutschistan und Sind selbstständig gemacht und in der ersten Hälfte des 19. Jahrhunderts gingen Kaschmir und das Pandschab verloren. Im Gefolge der Expansionspolitik Russlands und Großbritanniens im 19.
Jahrhundert und den damit einhergehenden Grenzfestlegungen wurden einzelne ethnische Gruppen (Paschtunen, Usbeken, Tadschiken, Turkmenen) von ihren angestammten, meist grenzüberschreitenden Siedlungsgebieten, zertrennt (Aufteilung der Völker auf verschiedene Staaten). Aman Ullah (1919-29, seit 1926 König) erreichte mit dem Vertrag von Rawalpindi (1919) die staatliche Unabhängigkeit Afghanistans. Größte Stadt ist die 3500 Jahre alte Hauptstadt Kabul. Zweitgrößte Stadt des Landes ist Kandahar im Süden Afghanistans, gefolgt von Alexander dem Großen gegründete Herat im Nordwesten sowie Mazar-e Sharif in Nord-Afghanistan und mit dem Grab des vierten Kalifen Ali ein Wallfahrtsort ist. Sie ist die prunkvollste Grab-Moschee Afghanistans aus dem späten 15. Jahrhundert. Aus der Stadt Herat in Afghanistan (früher Persien) stammt das Herati-Muster, in Persien wird es Mahi-Muster genannt. Es wird in den neueren persischen Bidschar, Täbris und Mud geknüpft. Es ist eine Anordnung von Rauten in Kombination mit stilisierten Blüten in gleichmäßigem Rapport. Durch Wanderung und Deportation der Knüpfnomaden aus dieser Region in den nordpersischen, kaukasischen und türkischen Raum ist diese Art Teppich aus Afghanistan nicht mehr anzutreffen.
Sources: de.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.
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.