REV-ERB agonist comes up often in conversation and rarely with the context attached. Here we lay out the basics in order, then work through the practical considerations.
Updated 2026-07-30. Numbers and descriptions here follow the published literature rather than marketing material.
Analytical identification of SR9009 typically relies on liquid chromatography coupled with tandem mass spectrometry. In biological samples, researchers first separate the compound from matrix components using protein precipitation, liquid-liquid extraction, or solid-phase extraction. High-performance liquid chromatography with ultraviolet detection and nuclear magnetic resonance spectroscopy can support structural confirmation of reference materials. Because SR9009 is a small, relatively lipophilic molecule, reverse-phase columns and acidic mobile phases are common. Laboratories often include isotope-labeled internal standards to improve quantification and to correct for ion suppression.
Stability depends on physical form, temperature, light exposure, and solvent. Solid SR9009 is generally stored cold and dry, with protection from light to limit degradation. Dimethyl sulfoxide stocks are common for laboratory work, but repeated freeze-thaw cycles can reduce compound integrity. Aqueous solutions may be less stable than organic stocks, and the ethyl ester in the structure can be susceptible to hydrolysis under certain conditions. Researchers typically validate storage conditions and recheck purity before quantitative experiments, especially when using archived material.
Regulatory treatment of SR9009 varies by country and region. It is not approved as a pharmaceutical, and several jurisdictions restrict its sale for human consumption. Some authorities classify it as a research chemical, a prescription-only substance, or a prohibited performance-enhancing agent in sport. Purchasers may encounter certificates of analysis, but these documents do not guarantee identity, purity, or legality. In research settings, institutional safety reviews and controlled procurement help ensure that materials are handled under appropriate oversight. The absence of harmonized rules means that legal status can change and requires verification.
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.
Scientific discussion of SR9009 often separates animal evidence from human anecdote. Rodent studies provide controlled data on endurance, metabolism, and gene expression, but they use specific strains, doses, and treatment durations. Human reports are mostly uncontrolled and cannot establish cause and effect. Open questions include oral bioavailability, tissue distribution, metabolic stability, and long-term effects. Review articles generally call for more rigorous pharmacokinetic and safety research before any clinical use could be considered.
| Property | Value | Notes |
|---|---|---|
| Common synonyms | SR9009; Stenabolic | Nickname is not a chemical name. |
| Typical analytical method | LC-MS/MS | Often with isotope-labeled internal standard. |
| Storage temperature | -20 °C | Desiccated and protected from light. |
| Solution stability | DMSO stock; avoid freeze-thaw | Store at -20 to -80 °C. |
| Regulatory status | Not approved; varies by country | May be restricted as research chemical. |
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.
SR9009 is frequently discussed in fitness and research-chemical contexts, yet it has no approved medical indication. Regulatory agencies have not authorized it for human use, and it is not a standard prescription drug. Some sports organizations list it as a prohibited substance because of its potential performance-enhancing properties. Published human data are sparse, so claims about its effects in people often rely on animal models or anecdotal reports. Quality and identity of online materials can vary widely.
SR9009 is a synthetic small molecule studied as a REV-ERB agonist. REV-ERBα and REV-ERBβ are nuclear receptors that help regulate circadian rhythms and metabolic gene expression. The compound was identified in academic screening efforts to find synthetic ligands for these receptors. In cell and animal studies, SR9009 alters transcription of genes involved in lipid and glucose metabolism, and it can shift circadian behavior. It is not an approved therapeutic agent.
SR9009 is generally described as poorly soluble in water and more soluble in organic solvents such as dimethyl sulfoxide and ethanol. Stock solutions are commonly prepared in an organic solvent before dilution into an aqueous buffer or vehicle. Precipitation can occur if the organic fraction is reduced too quickly or if the final concentration exceeds the compound's solubility limit. Sonication or gentle warming may aid dissolution in some protocols, but excessive heat can promote degradation. Container material and pH can also influence observed solubility.
For long-term storage, SR9009 is typically kept as a solid at low temperature, protected from moisture and light. Desiccated conditions limit hydrolysis, while opaque containers reduce photochemical breakdown. Solutions are less stable than solids and are often stored frozen in aliquots to avoid repeated freeze-thaw cycles. Stability data are not standardized across all suppliers, so users should rely on certificate-of-analysis information when available. Degradation may appear as color change, precipitate, or decreased chromatographic purity.
Laboratory identification of SR9009 typically relies on chromatographic separation coupled to mass spectrometry, often with ultraviolet detection as a secondary check. Nuclear magnetic resonance spectroscopy can confirm molecular structure when a reference standard is available. Because many suppliers sell the compound as a research chemical, independent identity testing is important for experimental reproducibility. A single retention time is not sufficient proof of identity, especially when related compounds may be present. Purity assessments usually report a percentage based on area normalization.
=== Art history === In European pre-historic societies, sculptures of female figures with pronounced or highly exaggerated breasts were common. A typical example is the so-called Venus of Willendorf, one of many Paleolithic Venus figurines with ample hips and bosom. Artifacts such as bowls, rock carvings and sacred statues with breasts have been recorded from 15,000 BC up to late antiquity all across Europe, North Africa and the Middle East. Many female deities representing love and fertility were associated with breasts and breast milk. Figures of the Phoenician goddess Astarte were represented as pillars studded with breasts. Isis, an Egyptian goddess who represented, among many other things, ideal motherhood, was often portrayed as suckling pharaohs, thereby confirming their divine status as rulers. Even certain male deities representing regeneration and fertility were occasionally depicted with breast-like appendices, such as the river god Hapy who was considered to be responsible for the annual overflowing of the Nile.
=== Condom use === One Australian study of 184 men looked at penis length and circumference in relation to condom breakage or slippage. 3,658 condoms were used. The study found that when used correctly, condoms had a breakage rate of 1.34% and a slippage rate of 2.05%, for a total failure rate of 3.39%. Penile dimensions did not influence slippage, although penis circumference and broken condoms were strongly correlated, with larger sizes increasing the rate of breakage.
== Toxicity == A few cases reported poisoning from commercially available products. The consumption of seeds represent a greater concern. Overconsumption of Ginkgo biloba seeds, especially by children, can result in loss of consciousness, convulsions, and death. Ginkgotoxin is structurally related to vitamin B6. It is suspected that ginkgotoxin interferes with the synthesis of the vitamin by decreasing the activity of pyridoxal kinase in mammals. This decrease leads to the decreased availability of glutamate decarboxylase. In turn, it causes an imbalance between excitation and inhibition of neurotransmitters, resulting in epileptic seizures. The toxicity of ginkgotoxin consequently can be relieved by taking vitamin B6 supplements.
== Research == Elaunin fibers have been found within the secretory coil of human eccrine sweat glands. They were found in bundles of microtubules which had a different constancy than elastic fibers. The elaunin fibers found in the secretory coil had a less thick appearance than that of elastic fibers. Elaunin can be identified where the fibers of the gingival ligament are. There are elastic fibers, and one of the main types of elastic fibers is elaunin. In the papillary dermis, elaunin is lost when in reduction. Proteins such as Fibulin-5 keep elastic fibers organized and functional. Fibulin-5 levels can drop due to normal aging or damage caused by UV exposure, this makes the elastic fibers start to lose its structure. They contribute to maintaining elasticity but are also sensitive to environmental stress and the natural aging process.
Sources: en.wikipedia.org
King Crimson toured in 2003 to support the album; recordings from it were used for the live album EleKtrik: Live in Japan. 2003 also saw the release of the DVD Eyes Wide Open, a compilation of the band's shows Live at the Shepherds Bush Empire (London, 3 July 2000) and Live in Japan (Tokyo, 16 April 2003). In November 2003, Gunn left the group to pursue solo projects and was replaced by Levin. The band reconvened in early 2004 for rehearsals, but nothing developed from these sessions; they then went on another hiatus. At this point, Fripp was publicly reassessing his desire to work within the music industry, often citing the unsympathetic aspects of the life of a touring musician, such as "the illusion of intimacy with celebrities". Two retrospective box sets, The 21st Century Guide to King Crimson Volume One 1969–1974 and The 21st Century Guide to King Crimson Volume Two 1981–2003, were issued in 2004 and 2005 respectively. On 21 September 2006, former King Crimson member Boz Burrell died of a heart attack, followed by another former member, Ian Wallace, who died of esophageal cancer on 22 February 2007.
The tea leaves are packaged loosely in a canister, paper bag, or other container such as a tea chest. Some whole teas, such as rolled gunpowder tea leaves, which resist crumbling, are vacuum-packed for freshness in aluminised packaging for storage and retail. The loose tea is individually measured for use, allowing for flexibility and flavour control at the expense of convenience. Strainers, tea balls, tea presses, filtered teapots, and infusion bags prevent loose leaves from floating in the tea and over-brewing. A traditional method uses a three-piece lidded teacup called a gaiwan, the lid of which is tilted to decant the tea into a different cup for consumption.
Neh2 allows for binding of NRF2 to its cytosolic repressor Keap1, through the conserved sites ETGE and DLG. Neh4 and Neh5 act as transactivation domains by binding to cAMP Response Element Binding Protein (CREB), which possesses intrinsic histone acetyltransferase activity. Neh7 is involved in the repression of Nrf2 transcriptional activity by the retinoid X receptor α through a physical association between the two proteins. Neh6 may contain a degron that is involved in a redox-insensitive process of degradation of NRF2. This occurs even in stressed cells, which normally extend the half-life of NRF2 protein relative to unstressed conditions by suppressing other degradation pathways. Its two conserved motifs, DSGIS and DSAPGS, are recognized by β-TrCP (BTRC and FBXW11 in mammals). Neh1 is a CNC-bZIP domain that allows Nrf2 to heterodimerize with small Maf proteins (MAFF, MAFG, MAFK). Neh3 may play a role in NRF2 protein stability and may act as a transactivation domain, interacting with component of the transcriptional apparatus. The "domains" of Nrf2 are regions of conservation, not protein domains in the structural sense. Neh2, Neh7 and Neh1 are partially unstructured. Neh3 and Nah6 is predicted to be mainly unstructured. Neh4 and Neh5 are disordered, meaning they do not fold into a fixed shape. Neh4 and Neh5 have been predicted as structured, but experimental data show otherwise. The methods employed by InterPro, from curated domain patterns to AlphaFold, cover less than half of human Nrf2.
Cocaine should not be used in individuals with a known allergy or hypersensitivity to the drug or any components of its topical formulation. It is also contraindicated in elderly patients and those with a history of hypertension or cardiovascular disease.
Co-precipitation is a facile and convenient way to synthesize iron oxides (either Fe3O4 or γ-Fe2O3) from aqueous Fe2+/Fe3+ salt solutions by the addition of a base under inert atmosphere at room temperature or at elevated temperature. The size, shape, and composition of the magnetic nanoparticles very much depends on the type of salts used (e.g.chlorides, sulfates, nitrates), the Fe2+/Fe3+ ratio, the reaction temperature, the pH value and ionic strength of the media, and the mixing rate with the base solution used to provoke the precipitation. The co-precipitation approach has been used extensively to produce ferrite nanoparticles of controlled sizes and magnetic properties. A variety of experimental arrangements have been reported to facilitate continuous and large–scale co–precipitation of magnetic particles by rapid mixing. Recently, the growth rate of the magnetic nanoparticles was measured in real-time during the precipitation of magnetite nanoparticles by an integrated AC magnetic susceptometer within the mixing zone of the reactants.
Sources: en.wikipedia.org
=== Lethal dose === Death from caffeine ingestion appears to be rare, and most commonly caused by an intentional overdose of medications. In 2016, 3702 caffeine-related exposures were reported to Poison Control Centers in the United States, of which 846 required treatment at a medical facility, and 16 had a major outcome; and several caffeine-related deaths are reported in case studies. The LD50 of caffeine in rats is 192 milligrams per kilogram of body mass. The fatal dose in humans is estimated to be 150–200 milligrams per kilogram, which is 10.5–14 grams for a typical 70 kg (150 lb) adult, equivalent to about 75–100 cups of coffee. There are cases where doses as low as 57 milligrams per kilogram have been fatal. A number of fatalities have been caused by overdoses of readily available powdered caffeine supplements, for which the estimated lethal amount is less than a tablespoon. The lethal dose is lower in individuals whose ability to metabolize caffeine is impaired due to genetics or chronic liver disease. A death was reported in 2013 of a man with liver cirrhosis who overdosed on caffeinated mints.
=== Pharmacodynamics === Venlafaxine is usually categorized as a serotonin-norepinephrine reuptake inhibitor (SNRI), but it has also been referred to as a serotonin-norepinephrine-dopamine reuptake inhibitor (SNDRI). It is described as 'synthetic phenethylamine bicyclic derivative with antidepressant activity'. It works by blocking the transporter "reuptake" proteins for key neurotransmitters affecting mood, thereby leaving more active neurotransmitters in the synapse. The neurotransmitters affected are serotonin and norepinephrine. Additionally, in high doses, it weakly inhibits the reuptake of dopamine. The frontal cortex largely lacks dopamine transporters and instead relies on norepinephrine transporters for dopamine reuptake; therefore venlafaxine can increase dopamine neurotransmission in this part of the brain. Venlafaxine selectively inhibits the serotonin transporter at lower doses, but at a dose of 225 mg per day it additionally blocks the norepinephrine transporter (NET), as measured by the intravenous tyramine pressor test. Venlafaxine indirectly affects opioid receptors as well as the α2-adrenergic receptor, and was shown to increase pain threshold in mice. These benefits with respect to pain were reversed with naloxone, an opioid antagonist, thus supporting an opioid mechanism.
John Franklin Enders, who had shared the 1954 Nobel Prize in Medicine for work on the polio virus, sent Thomas C. Peebles to Fay School in Massachusetts, where an outbreak of measles was underway. Peebles was able to isolate the virus from blood samples and throat swabs. He later successfully cultivated the virus and showed that the disease could be passed on to monkeys inoculated with the material he had collected. Enders used the cultivated virus to develop a measles vaccine in 1963 by attenuation through cultured chicken embryo fibroblasts of the material isolated by Peebles. In the late 1950s and early 1960s, nearly twice as many children died from measles as from polio. The vaccine Enders developed was based on the Edmonston strain of attenuated live measles virus, which was named for 11-year-old David Edmonston, the Fay student from whom Peebles had taken the culture that led to the virus's cultivation. In the mid-20th century, measles was particularly devastating in West Africa, where child mortality rate was 50 percent before age five, and the children were struck with the type of rash and other symptoms common prior to 1900 in England and other countries. The first trial of a live attenuated measles vaccine was undertaken in 1960 by British paediatrician David Morley in a village near Ilesha, Nigeria; in case he could be accused of exploiting the Nigerian population, Morley included his own four children in the study. The encouraging results led to a second study of about 450 children in the village and at the Wesley Guild Hospital in Ilesha.
He maintained that only the vanguard made up of about a thousand men had been destroyed in Tarqui, after having vigorously resisted the entire Gran Colombian army; and he added that his attack on the most immediate plain was awaited in vain after the charge of the Cedeño squadron had been repulsed by the Husares de Junín. He emphasized that the entire Peruvian army had not gathered more than 4,500 men and that by mentioning their number raising it to 8,000, Sucre had made a willful mistake for anti-Peruvian reasons. For all these reasons, he declared the Girón Agreement suspended: "while [...] satisfaction capable of indemnifying the injuries received is given, and the depressive documents are destroyed, the existence of which would drive away even the hope of reconciliation." For this reason, he proceeded to denounce the Girón Agreement, once again preparing to undertake hostilities.
Temperatures above 30 °C (86 °F) have negative effects on potato crops, from physiological damage such as brown spots on tubers, to slower growth, premature sprouting, and lower starch content. These effects reduce crop yield, affecting both the number and the weight of tubers. As a result, areas where current temperatures are near the limits of potatoes' temperature range (e.g. much of sub-Saharan Africa) will likely suffer large reductions in potato crop yields in the future. On the other hand, low temperatures reduce potato growth and present risk of frost damage.
Sources: en.wikipedia.org
The most common approach is liquid chromatography-tandem mass spectrometry, often after extraction from blood, urine, or tissue. Ultraviolet detection and nuclear magnetic resonance spectroscopy are used mainly for reference material characterization. Isotope-labeled internal standards improve accuracy.
Solid material is usually kept at -20 °C, desiccated, and protected from light. Dimethyl sulfoxide stocks should be stored cold and subjected to minimal freeze-thaw cycles. Aqueous solutions are generally less stable and should be prepared fresh when possible.
Legality depends on the country and the intended use. It is not an approved medicine, and some places restrict or ban sales for human consumption. Buyers should verify local rules and product documentation before procurement.
No. It is an investigational compound without approved therapeutic indications. It is sold for research purposes only in many jurisdictions.