If you have been reading about LC-MS/MS 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 2026-08-01. Numbers and descriptions here follow the published literature rather than marketing material.
Most published work on SR9009 consists of preclinical studies. It is widely sold as a research chemical, a category that does not imply safety, efficacy, or pharmaceutical-grade quality. Sports anti-doping organizations have listed SR9009 as a prohibited substance, and its presence in an athlete sample can lead to sanctions. Legal status differs by country; in several jurisdictions it is not approved for human consumption and may be treated as an unapproved new drug.
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.
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 |
|---|---|---|
| Common name | SR9009 | Also referred to as Stenabolic in non-scientific contexts. |
| Chemical class | Synthetic small molecule | Not a steroid or peptide hormone. |
| Receptor target | REV-ERBα and REV-ERBβ | Nuclear receptor agonist in preclinical studies. |
| Development status | Investigational | No approved human therapeutic indication. |
| Regulatory attention | Prohibited in sport | Listed by anti-doping authorities. |
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.
SR9009 is a synthetic small molecule developed as a REV-ERB agonist. It binds to REV-ERBα and REV-ERBβ, nuclear receptors that help regulate circadian rhythms and metabolic gene expression. In cell and animal studies, the compound alters lipid and glucose handling and influences skeletal muscle oxidative capacity. Its exact effects in humans remain largely uncharacterized because controlled clinical trials have not been reported. The molecule is frequently described in preclinical literature as a metabolic modulator.
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.
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.
Detection of SR9009 in biological samples usually relies on liquid chromatography coupled to tandem mass spectrometry. This approach separates the compound from matrix components and identifies it by mass transitions. Because SR9009 can undergo metabolism, laboratories often look for both parent drug and specific metabolites. Sample preparation may involve protein precipitation or solid-phase extraction. Method validation examines sensitivity, carryover, and interference from related substances, and reference standards are required for accurate calibration.
Storage recommendations for SR9009 reference material typically specify a freezer at -20 °C or lower, with protection from moisture and light. Repeated freeze-thaw cycles can degrade small molecules and introduce variability. Stock solutions in dimethyl sulfoxide are often aliquoted to avoid repeated handling. Stability studies may examine degradation under heat, humidity, and light exposure. The compound's thiophene and nitro groups can participate in reactions that alter analytical signals over time, so such changes affect quantitative results.
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.
Between 1961 and 1965, Rhodesia took in an average of 8,225 white immigrants per year while also having an average white emigration of 12,912 per year. Many prospective white immigrants in Rhodesia arrived seeking economic opportunities and departed with fluctuations in the security situation as the Bush War intensified. A substantial number were uninterested in settling there permanently and did not apply for Rhodesian citizenship, despite a much-publicised 1967 campaign urging them to do so. Brownell asserted that patriotism in the white community was "shallow" due to its essentially expatriate character. He also claimed that the majority of white immigrants in the late 1960s and early 1970s were unskilled labourers who competed with the country's black African workforce and did not contribute badly needed technical or professional skills to the country, arguing that this was due to government policy aimed at making white immigration as "unselective as possible" and guaranteeing every white immigrant a job. The population of Rhodesia boomed during the late 1960s due to immigration and an exceptional rate of natural increase among its black citizens, the highest in sub-Saharan Africa at the time.
== Other == Lower levels of adiponectin are associated with ADHD in adults. Adiponectin levels were found to be increased in rheumatoid arthritis patients responding to DMARDs or TNF inhibitor therapy. A low adiponectin to leptin ratio has been found in patients with COVID-19 pneumonia compared to healthy controls. Exercise induced release of adiponectin increased hippocampal growth and led to antidepressive symptoms in mice. Several studies have found a positive correlation in caffeine consumption and increased adiponectin levels, although the mechanism for this is unknown and requires more research.
=== Off-label drugs === Antihistamines (histamine H1 receptor antagonists) (e.g., cetirizine, desloratadine, fexofenadine, levocetirizine, loratadine) Corticosteroids (corticosteroid receptor agonists) (e.g., hydrocortisone, prednisone, triamcinolone acetonide) Hydroquinone – tyrosinase inhibitor and skin-lightening agent Nicotinamide (niacinamide) – vitamin B3 Oral antiandrogens (androgen receptor antagonists) (e.g., spironolactone, cyproterone acetate, flutamide, bicalutamide, ketoconazole, cimetidine) Other antibiotics (e.g., erythromycin, metronidazole, sulfacetamide) Other ethinylestradiol-containing combined oral contraceptives Salicylic acid – various actions (keratolytic, comedolytic, and bacteriostatic) Zinc – undefined mechanism of action (antibacterial and anti-inflammatory)
=== Hosting === In addition to acting, Hart has also hosted various ceremonies. Hart first hosted the 2011 BET Awards. Hart then hosted the 2012 MTV Video Music Awards, after his longtime friend Judd Apatow, the director who gave him his first big on-screen break in the TV series Undeclared, recommended him for the position. Hart hoped this would project him into a side career as an emcee, stating: "Hopefully after MTV, of course we're talking Emmys, Oscars, whatever." From 2013–2015, he hosted three episodes of Saturday Night Live. In 2015, Hart hosted the Comedy Central Roast of Justin Bieber. In 2016, Hart co-hosted the 2016 MTV Movie Awards with Dwayne Johnson. In September 2018 Hart hosted HQ Trivia with Scott Rogowsky and gave away $100,000 to one person. On December 4, 2018, Hart was announced as the host of the 2019 Academy Awards. Two days later, however, he withdrew from hosting duties in the wake of backlash against him over several homophobic tweets he had posted between 2010 and 2011. He characterized the protest as unconstructive and argued: "If you don't believe people change, grow as they get older, I don't know what to tell you." On December 7, he tweeted an apology to the LGBTQ community following criticism for not issuing one the previous day.
Eggshells, snail shells and most seashells are predominantly calcium carbonate and can be used as industrial sources of that chemical. Oyster shells have experienced recognition as a source of dietary calcium since the early 2010s, but also remain a practical industrial source. Dark green vegetables such as broccoli and kale contain dietarily significant amounts of calcium carbonate, but they not practical as an industrial source. Annelids in the family Lumbricidae, earthworms, possess a regionalization of the digestive track called calciferous glands, Kalkdrüsen, or glandes de Morren, that processes calcium and CO2 into calcium carbonate, which is later excreted into the dirt. The function of these glands is unknown but is believed to serve as a CO2 regulation mechanism within the animals' tissues. This process is ecologically significant, stabilizing the pH of acid soils.
Sources: en.wikipedia.org
==== Specimen storage and stability ==== Blood specimens for complete blood count (CBC) analysis should ideally be analysed as soon as possible after collection to minimise pre-analytical changes. When delays are unavoidable, EDTA-anticoagulated blood may be stored under refrigerated conditions (2–8 °C), although the stability of individual CBC parameters varies. Haemoglobin concentration and red blood cell and white blood cell counts are generally more stable during refrigerated storage than platelet-related parameters and some red blood cell indices. Laboratories should follow validated storage recommendations and consider potential analytical changes when interpreting delayed specimens. Blood tests are also used to identify autoimmune diseases and Immunoglobulin E-mediated food allergies (see also Radioallergosorbent test).
== Further reading == Fruton, Joseph S. Proteins, Enzymes, Genes: The Interplay of Chemistry and Biology. Yale University Press: New Haven, 1999. ISBN 0-300-07608-8 Kohler, Robert. From Medical Chemistry to Biochemistry: The Making of a Biomedical Discipline. Cambridge University Press, 1982.
=== Medical imaging === A physician may diagnose an inguinal hernia, as well as the type, from medical history and physical examination. For confirmation or in uncertain cases, medical ultrasonography is the first choice of imaging, because it can both detect the hernia and evaluate its changes with for example pressure, standing and Valsalva maneuver. When assessed by ultrasound or cross sectional imaging with CT or MRI, the major differential in diagnosing indirect inguinal hernias is differentiation from spermatic cord lipomas, as both can contain only fat and extend along the inguinal canal into the scrotum. On axial CT, lipomas originate inferior or lateral to the cord, and are located inside the cremaster muscle, while inguinal hernias lie anteromedial to the cord and are not intramuscular. Large lipomas may appear nearly indistinguishable as the fat engulfs anatomic boundaries, but they do not change position with coughing or straining.
== Interactions == Contraindications include prior treatment (within the past 2 weeks) with MAOIs such as phenelzine and tranylcypromine, due to the potential for serotonin syndrome. Its use should also be avoided in those with known hypersensitivities to fluoxetine or any of the other ingredients in the formulation used. Its use in those concurrently receiving pimozide or thioridazine is also advised against. In case of short-term administration of codeine for pain management, it is advised to monitor and adjust dosage. Codeine might not provide sufficient analgesia when fluoxetine is co-administered. If opioid treatment is required, oxycodone use should be monitored since oxycodone is metabolized by the cytochrome P450 (CYP) enzyme system and fluoxetine and paroxetine are potent inhibitors of CYP2D6 enzymes. This means combinations of codeine or oxycodone with fluoxetine antidepressant may lead to reduced analgesia. In some cases, use of dextromethorphan-containing cold and cough medications with fluoxetine is advised against, due to fluoxetine increasing serotonin levels, as well as the fact that fluoxetine is a cytochrome P450 2D6 inhibitor, which causes dextromethorphan to not be metabolized at a normal rate, thus increasing the risk of serotonin syndrome and other potential side effects of dextromethorphan. Patients who are taking NSAIDs, antiplatelet drugs, anticoagulants, omega-3 fatty acids, vitamin E, and garlic supplements must be careful when taking fluoxetine or other SSRIs, as they can sometimes increase the blood-thinning effects of these medications.
== Other uses == The nutrition-rich nature of yeast extract lends it to a variety of uses. It was historically popular as a vitamin supplement for humans. Rich in proteins and nucleotides, it currently finds use in animal feed and microbiology (see yeast extract agar) as nutritional supplements. It also finds use in cosmetics and skincare products due to its alleged moisturizing and antioxidant properties.
Sources: en.wikipedia.org
It is a synthetic compound studied as an agonist of REV-ERB nuclear receptors. It is not an approved medicine and has mainly been examined in laboratory and animal research.
No. It is a small molecule that binds nuclear receptors involved in circadian regulation. Its classification differs from anabolic steroids or peptide hormones.
Published human clinical trial data are lacking. Most safety and activity information comes from preclinical models, so effects in people remain uncertain.
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.