The short version of circadian clock fits in a sentence. The long version — which is the one that helps — is below.
This page was last updated on 2026-06-06 and is reviewed periodically as new material appears.
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.
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.
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.
| Property | Value | Notes |
|---|---|---|
| Appearance | White to off-white powder | Typical for research-grade material |
| Solubility | Soluble in DMSO and ethanol; low aqueous solubility | Organic stock solutions are common |
| Typical storage temperature | -20 °C or lower | Protect from light and moisture |
| Common analytical method | LC-MS/MS | Used for detection and confirmation |
| Common synonyms | SR9009; Stenabolic | Stenabolic is an informal name |
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.
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.
Physicochemical behavior influences handling. SR9009 is described as a solid with limited aqueous solubility, so organic solvents such as dimethyl sulfoxide or ethanol are common in research stock solutions. Aqueous dilution can produce precipitates if the organic content is too low. Light, heat, and repeated freeze-thaw cycles may affect stability. Storage recommendations usually specify a desiccated freezer environment protected from light, but exact stability data depend on the formulation and matrix.
Detection in biological samples can be complicated by rapid metabolism and low circulating concentrations. Some studies report phase I and phase II metabolites, and analytical methods may need to target those species in addition to the parent compound. Immunoassays are not broadly available, so mass spectrometry remains the main confirmatory approach. For anti-doping testing, laboratories look for SR9009 and its metabolites using validated LC-MS methods. Open questions include how long metabolites remain detectable and how different routes of administration alter detection windows.
In laboratory settings, SR9009 is typically characterized by liquid chromatography–mass spectrometry (LC-MS) or high-performance liquid chromatography with ultraviolet detection (HPLC-UV). These methods can confirm identity and estimate purity, but they require reference standards for accurate quantification. Because SR9009 is not a licensed pharmaceutical, no harmonized pharmacopeial monograph exists. Laboratories often validate in-house methods for matrices such as plasma, urine, or cell culture media. Sample preparation may involve protein precipitation or liquid-liquid extraction before analysis.
SR9009 is a synthetic small molecule studied as an agonist of the nuclear receptors REV-ERBα and REV-ERBβ. It is not a steroid, peptide, or natural hormone. In scientific literature, it appears under the code SR9009 and in non-scientific contexts as Stenabolic. The compound was identified through chemical screening efforts aimed at targeting circadian clock components. Its status remains investigational, and no regulatory agency has approved it as a human medicine.
REV-ERB proteins help regulate daily cycles in gene expression, including genes tied to lipid and glucose metabolism. SR9009 binds these receptors and alters their activity in cell and animal experiments. Consequences observed in rodents include changes in skeletal muscle oxidative capacity, blood lipid levels, and exercise performance. The precise chain from receptor occupancy to whole-body effects is still an active area of study. Human responses cannot be assumed from rodent data.
=== Phenylbutyrate therapy === Sodium phenylacetate/benzoate or sodium phenylbutyrate has been shown to reduce BCAA in a clinical trial done February 2011. Phenylbutyrate treatment reduced the blood concentration of BCAA and their corresponding BCKA in certain groups of MSUD patients and may be a possible adjunctive treatment.
Venous plexuses There are a number of venous plexuses where veins are grouped or sometimes combined in networks at certain body sites. The Batson venous plexus, runs through the inner vertebral column connecting the thoracic and pelvic veins. These veins are noted for being valveless, believed to be the reason for metastasis of certain cancers. A subcutaneous venous plexus is continuous, and a high rate of flow is supplied by small arteriovenous anastomoses. The high rate of flow ensures heat transfer to the vein wall.
=== Legal status === Effective August 2014, tramadol has been placed into Schedule IV of the federal Controlled Substances Act in the United States. Before that, some US states had already classified tramadol as a Schedule IV controlled substance under their respective state laws. Tramadol is classified in Schedule 4 (prescription only) in Australia, rather than as a Schedule 8 Controlled Drug (possession without authority illegal) like most other opioids. Effective May 2008, Sweden classified tramadol as a controlled substance in the same category as codeine and dextropropoxyphene, but allows a normal prescription to be used. In June 2014, the United Kingdom's Home Office classified tramadol as a Class C, Schedule 3 controlled drug, but exempted it from the safe custody requirement. In October 2023, New Zealand's Medsafe reclassified tramadol as a Class C2 Controlled Drug (in addition to its existing status as a prescription only medication). Effective 22 August 2025, the government of Liberia increased regulations on tramadol. Its use was "strictly limited to licensed hospital settings under the direct supervision of professional medical staff" according to the Liberian Observer. Liberian health authorities claimed that tramadol was the "most widely abused drug" in the country.
=== Post 1930s === The field of fermentation has been critical to producing a wide range of consumer goods, from food and drink to industrial chemicals and pharmaceuticals. Since its early beginnings in ancient civilizations, fermentation has continued to evolve and expand, with new techniques and technologies driving advances in product quality, yield, and efficiency. The period from the 1930s onward saw a number of significant advancements in fermentation technology, including the development of new processes for producing high-value products like antibiotics and enzymes, the increasing importance of fermentation in the production of bulk chemicals, and a growing interest in the use of fermentation for the production of functional foods and nutraceuticals. In the 1970s and 1980s, fermentation became increasingly important in producing bulk chemicals like ethanol, lactic acid, and citric acid. This led to developing new fermentation techniques and genetically engineered microorganisms to improve yields and reduce production costs. In the 1990s and 2000s, there was a growing interest in fermentation to produce functional foods and nutraceuticals, which have potential health benefits beyond basic nutrition. This led to new fermentation processes, probiotics, and other functional ingredients.
=== Pregnancy === Before 2015, tazarotene was considered a Category X drug (meaning its use was contraindicated during pregnancy) according to US Food and Drug Administration (FDA) guidelines, despite demonstrating similar plasma retinoid levels as adapalene and tretinoin, which were classified as Category C drugs. Under the FDA's updated Pregnancy and Lactation Labeling Rule which eliminated the lettered pregnancy categories and came into effect in 2015, tazarotene was determined to be contraindicated in pregnancy. Because of the lack of pregnancy outcomes data for the drug, the determination was based on the teratogenic effects observed in rat and rabbit studies.
Sources: en.wikipedia.org
== Toxicity == Several typical mechanisms underlying graphene (oxide) nanomaterial's toxicity have been revealed, for instance, physical destruction, oxidative stress, DNA damage, inflammatory response, apoptosis, autophagy, and necrosis. In these mechanisms, toll-like receptors (TLR), transforming growth factor-beta (TGF-β) and tumor necrosis factor-alpha (TNF-α) dependent-pathways are involved in the signalling pathway network, and oxidative stress plays a crucial role in these pathways. Many experiments have shown that graphene (oxide) nanomaterials have toxic side effects in many biological applications, but more in-depth study of toxicity mechanisms is needed. According to the USA FDA, graphene, graphene oxide, and reduced graphene oxide elicit toxic effects both in vitro and in vivo. Graphene-family nanomaterials (GFN) are not approved by the USA FDA for human consumption.
It is a flexible tool for creating ROC graphs, sensitivity/specificity curves, area under curve and precision/recall curve. The parametrization can be visualized by coloring the curve according to cutoff. WebCDK: A web interface for the CDK library which is used for predicting descriptors of chemicals. Pharmacokinetics: This data analysis determines the relationship between the dosing regimen and the body's exposure to the drug as measured by the drug's nonlinear concentration time curve. It includes a function to calculate area under this curve. It also includes functions for half-life estimation for a biexponential model, and a two phase linear regression.
=== Locus coeruleus–noradrenergic system === This theory hypothesizes that autistic behaviors depend at least in part on a developmental dysregulation that results in impaired function of the locus coeruleus–noradrenergic (LC-NA) system. The LC-NA system is heavily involved in arousal and attention; for example, it is related to the brain's acquisition and use of environmental cues.
=== Gold Cup runners-up and the 2001 Copa América (2000–2001) === Colombia made their first appearance at the CONCACAF Gold Cup as invited guests in 2000, beating Jamaica 1–0 through Gonzalo Martínez and losing 2–0 to Honduras in a three-team group, both matches played at the Miami Orange Bowl. In the quarter-final on 19 February they twice came from behind against the hosts the United States — Faustino Asprilla cancelling out Brian McBride and Gerardo Bedoya equalising in the 81st minute after Chris Armas had scored — to draw 2–2 after extra time, then won the shootout 2–1 in a sequence in which six of the nine attempts failed. A 2–1 semi-final win over Peru at Qualcomm Stadium followed, an own goal by Marcial Salazar and a Víctor Bonilla strike putting Colombia through before a crowd of 3,402. In the final at the Los Angeles Memorial Coliseum on 27 February, Canada won 2–0 through a Jason de Vos header in first-half stoppage time and a Carlo Corazzin penalty, before 6,197 spectators.
=== Cancer === Over-activation of mTOR signaling significantly contributes to the initiation and development of tumors and mTOR activity was found to be deregulated in many types of cancer including breast, prostate, lung, melanoma, bladder, brain, and renal carcinomas. Reasons for constitutive activation are several. Among the most common are mutations in tumor suppressor PTEN gene. PTEN phosphatase negatively affects mTOR signalling through interfering with the effect of PI3K, an upstream effector of mTOR. Additionally, mTOR activity is deregulated in many cancers as a result of increased activity of PI3K or Akt. Similarly, overexpression of downstream mTOR effectors 4E-BP1, S6K1, S6K2 and eIF4E leads to poor cancer prognosis. Also, mutations in TSC proteins that inhibit the activity of mTOR may lead to a condition named tuberous sclerosis complex, which exhibits as benign lesions and increases the risk of renal cell carcinoma. Increasing mTOR activity was shown to drive cell cycle progression and increase cell proliferation mainly due to its effect on protein synthesis. Moreover, active mTOR supports tumor growth also indirectly by inhibiting autophagy. Constitutively activated mTOR functions in supplying carcinoma cells with oxygen and nutrients by increasing the translation of HIF1A and supporting angiogenesis. mTOR also aids in another metabolic adaptation of cancerous cells to support their increased growth rate—activation of glycolytic metabolism.
Sources: en.wikipedia.org
Research-grade SR9009 is typically stored frozen at about minus twenty degrees Celsius, protected from light and moisture. Stock solutions are often kept in aliquots to avoid repeated freeze-thaw cycles. Specific storage conditions should follow the supplier's documentation.
Liquid chromatography with tandem mass spectrometry is widely used to detect and confirm SR9009 in laboratory samples. The technique offers high sensitivity and can distinguish the target compound from related substances. Nuclear magnetic resonance and ultraviolet detection may support identity and purity checks.
Online products labeled as SR9009 may vary in identity, purity, and actual content. Independent testing helps confirm that a sample matches its label and does not contain unexpected contaminants. This is important for reproducible research and for interpreting experimental results.
It is a synthetic research compound that activates REV-ERB nuclear receptors. It is not an approved drug or dietary supplement. Most information comes from cell and animal studies.