If you have been reading about DMSO stock 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 2025-12-22. Numbers and descriptions here follow the published literature rather than marketing material.
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 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.
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.
| Property | Value | Notes |
|---|---|---|
| Appearance | White to off-white powder | Common supplier description |
| Solubility | Soluble in DMSO and ethanol | Low solubility in water |
| Typical storage | −20 °C, desiccated, dark | For research samples |
| Analytical method | LC-MS/MS | Used for detection and quantification |
| Regulatory status | Prohibited in sport | WADA metabolic modulator class |
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.
SR9009 is a synthetic small molecule studied as an agonist of the nuclear receptors REV-ERBα and REV-ERBβ. It is not an approved medicine and has no established human therapeutic use. The compound appears in scientific literature as a tool for probing circadian and metabolic regulation. Online sellers often label it as a research chemical, sometimes using the nickname Stenabolic. Its chemical identity is distinct from selective androgen receptor modulators, stimulants, and peroxisome proliferator-activated receptor delta agonists. Researchers use it mainly in cell and animal experiments.
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 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.
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.
The finding consists of a single bone fragment about 2 cm long that was unearthed in 2012 by Russian archeologists at the Denisova Cave from layer 12 of the East Gallery. The cave is located in Denisova valley, Altai Mountains in Siberia, Russia. At the time, the origin of the bone fragment remained unknown because it was archived along with thousands of other nondescript bone fragments from the cave. In 2015, Tom Higham and Katerina Douka decided to try and apply new scientific methods to see whether they could be used to find human remains amongst the thousands of unidentified bone samples in the site. With the collaboration of the head excavators of the Denisova site; Michael Shunkov and Anatoly Derevianko, they took several bags containing thousands of unidentified bone fragments back to the University of Oxford. Samantha Brown, an MSc student at the University of Oxford, worked on the project as part of her dissertation research, screening more than 2000 bone fragments. Using Zooarchaeology by Mass Spectrometry (ZooMS) and working with the laboratory of Michael Buckley at the University of Manchester, they were able to compare the collagen protein fingerprints derived from the Denisova Cave bones to animals and humans of known origin, and they discovered that one of these bones (DC1227) belonged to an archaic human.
=== Emotional blunting === Certain antidepressants may cause emotional blunting, characterized by reduced intensity of both positive and negative emotions as well as symptoms of apathy, indifference, and amotivation. It may be experienced as either beneficial or detrimental depending on the situation. Higher doses of antidepressants seem to be more likely to produce emotional blunting than lower doses. It can be decreased by reducing dosage, discontinuing the medication, or switching to a different antidepressant that may have less propensity for causing this side effect. Specifically, this side effect has been particularly associated with serotonergic antidepressants like SSRIs and SNRIs and may be less with atypical antidepressants like bupropion, agomelatine, and vortioxetine. In addition, whereas the SSRI escitalopram was associated with emotional blunting, the serotonergic psychedelic psilocybin did not cause such side effects and instead was associated with emotional reactivation. Such psychedelic therapies may have future potential for addressing emotional blunting in those with depression. Confounding the understanding of emotional blunting is the fact that the same symptom can be caused by depression itself, and may instead be a sign of incomplete resolution of depression. However, there is a large amount of subjective evidence showing that it is increasingly reported after starting the use of antidepressants, suggesting that antidepressants do induce emotional blunting.
== History == Imetelstat is the first telomerase inhibitor to enter clinical trials. Chemically, imetelstat is a synthetic conjugate consisting of three parts: GRN163, a thio phosphoramide oligonucleotide, and a palmitoyl lipid group. GRN163 is the pharmacological component with telomerase inhibition based on experiments with poly-G oligonucleotides first conducted at the University of Nebraska Medical Center under contract with Lynx Therapeutics. The palmitic acid moiety is conjugated via a phosphothioate linkage to the backbone of the antisense oligonucleotide. Telomere shortening and lower cell viability are observed after inhibition of telomerase activity in vitro. IC50 values ranged from 50 to 200nM for 10 different pancreatic cell lines. The efficacy of imetelstat was evaluated in IMerge (NCT02598661), a randomized (2:1), double-blind, placebo-controlled multicenter trial in 178 participants with myelodysplastic syndromes. Participants received an intravenous infusion of imetelstat 7.1 mg/kg or placebo in 28-day treatment cycles until disease progression or unacceptable toxicity. Randomization was stratified by prior red blood cell transfusion burden and by International Prognostic Scoring System (IPSS) risk group. All participants received supportive care, which included red blood cell transfusions.
Sources: en.wikipedia.org
== Ecology == Cercopagis pengoi is eurythermal and euryhaline, being able to tolerate a wide range of temperature and salinity. It is a pelagic species, found in a higher abundance further from the shore and from the bottom. It is a generalist feeder which preys on various species in both micro- and mesozooplankton (i.e. cladocerans, copepods, rotifers). The size of prey ranges from its own body size to seventeen times smaller. Prey is captured using thoracopods I, then retained by thoracopods II-IV, and crushed by its cuticle by mandibles, finally C. pengoi sucks the prey body contents. Fishhook waterfleas reproduce asexually during the summer, which produces a quick rise in population. When conditions are inhospitable, C. pengoi will undergo sexual reproduction, producing resting eggs that can over-winter and repopulate the lake quickly in the spring. Resting eggs can withstand desiccation (extreme dryness), freeze-drying, and ingestion by fish.
Just as the action to change basal rate should be gradual in nature, the actual response from changing basal rate does not happen instantly. A change in basal rate is felt around two hours after the action is done. This is especially important for those with diabetes to note, as it affects when they should act to monitor their basal rates. For example, if there is a particular time in the day when one notices a problem with blood glucose levels, they should act to change their basal rate accordingly two hours prior to when the problem was previously experienced.
==== Increasing endogenous production ==== Regular exercise is known to increase DHEA production in the body. Calorie restriction has also been shown to increase DHEA in primates. Some theorize that the increase in endogenous DHEA brought about by calorie restriction is partially responsible for the longer life expectancy known to be associated with calorie restriction.
== Medical uses == Ropinirole is prescribed for mainly Parkinson's disease, restless legs syndrome, and extrapyramidal symptoms. It can also reduce the side effects caused by selective serotonin reuptake inhibitors, including Parkinsonism syndrome as well as sexual dysfunction and erectile dysfunction caused by either SSRIs or antipsychotics. A 2008 meta-analysis found that ropinirole was less effective than pramipexole in the treatment of restless legs syndrome.
Sources: en.wikipedia.org
Mayer, suggested flight to the suburbs was grounded as much in economics as race: "Present population trends clearly demonstrate that the city is, by and large, being abandoned by all except those who suffer from relatively great ... deprivations." White families were in better positions to relocate into the suburbs, in juxtaposition with black families who faced discrimination in home loans and in the real estate market. Highway construction post-WWII also contributed to white flight, specifically with the construction of the Interstate Highway System. This allowed white families to commute to work in the city from the suburbs easily and incentivized many white Detroiters to relocate thus. The construction of highways in Detroit further exacerbated the pre-existing racial segregation, as government officials built highways through areas that were seen as blighted – typically black "ghettos" – that were under-financed and under-maintained. As a result of white flight and mass migration to the suburbs, a significant change in the racial composition of Detroit occurred. From 1950 to 2010, the black/white population percentage went from 16.2%/83.6% to 82.7%/10.6%. Approximately 1,400,000 of the 1,600,000 white people in Detroit after World War II left the city for the suburbs. Beginning in the 1980s, for the first time in its history, Detroit was a majority-black city. This drastic racial demographic change resulted in more than a change in neighborhood appearance. It had political, social, and economic effects as well.
I. Bilobed flap The design of the bilobed flap derives from the creation of two adjacent random transposition flaps (lobes). In its original design, the leading flap is applied to cover the defect, and the second flap, is emplaced where the skin flexes more, and fills the donor-site wound (from where the first flap was harvested), which then is closed primarily, with sutures. The first flap is oriented geometrically, at 90 degrees from the long axis of the wound (defect), and the second flap is oriented 180 degrees from the axis of the wound. Although effective, the bilobed flap technique did create troublesome "dog ears" of excess flesh that required trimming and it also produced a broad skin-donor area that was difficult to confine to the nose. In 1989, J. A. Zitelli modified the bilobed flap technique by: (a) orienting the leading flap at 45 degrees from the long axis of the wound; and (b) orienting the second flap at 90 degrees from the axis of the wound. Said orientations and emplacements eliminated the excess-flesh "dog ears", and thus required a smaller area of donor skin; resultantly, the broad-based, bilobed flap is less prone to the "trap door" and the "pin cushion" deformities common to skin-flap transposition procedure.
=== Commercial applications === Similar to other networking technologies that began with the defense sector, e.g., the Defense Advanced Research Projects Agency (DARPA) funding ARPANET, the precursor to the Internet, DASH7 is similarly suited to a wide range of applications in development or being deployed, including:
Sources: en.wikipedia.org
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.
Detection commonly uses liquid chromatography–tandem mass spectrometry. This method can identify the compound in urine or blood at low concentrations.
Typical guidance is −20 °C, dry, and protected from light. Solutions should be aliquoted and limited freeze–thaw cycles should be used.
Liquid chromatography with mass spectrometry is a common approach. Ultraviolet detection and nuclear magnetic resonance can support identification when suitable standards are available.