If you have been reading about certificate of analysis 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.
Last reviewed on 2026-07-23. Where a claim depends on a specific study, the study is described rather than over-claimed.
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.
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.
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.
| 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. |
Quality control for research materials includes identity confirmation by nuclear magnetic resonance and purity assessment by high-performance liquid chromatography. Mass spectrometry provides molecular weight confirmation and can detect related impurities. Purchasers should request a certificate of analysis that lists lot-specific data. Online products advertised for human use often lack such documentation. Distinguishing legitimate research material from mislabeled or contaminated samples is a recurring challenge in independent testing, and independent laboratories may use orthogonal methods to verify identity.
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.
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.
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.
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.
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.
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.
According to a senior Pakistani government official cited by CBS News, Pakistan subsequently intensified diplomatic efforts to bring the US and Iran back to the negotiating table. Reports also indicated that Pakistani authorities began referring to the negotiations as part of a broader "Islamabad process", suggesting an effort to frame the engagement as an ongoing diplomatic track rather than a single round of talks. Pakistan remained in contact with both Washington and Tehran following the talks, urging a resumption of dialogue and seeking to facilitate a second round of negotiations before the expiration of the ceasefire in April 2026. On 14 April, it was reported that US and Iranian teams could be returning to Islamabad for talks to take place later in that week. Trump said on the same day that "we're more inclined to go there [Islamabad]" and that talks in Islamabad were "more likely". However, as of 20 April, it remained unclear if the Iranian side was planning to participate in the next round of talks, and on 21 April it was reported that Iran did not send any representative to the talks. The Institute for the Study of War reported a major disagreement between Iranian parliament speaker Mohammad Bagher Ghalibaf and IRGC commander Ahmad Vahidi, with Ghalibaf favoring participating in negotiations and Vahidi opposing participation.
Stark Law is a set of United States federal laws that prohibit physician self-referral, specifically a referral by a physician of a Medicare or Medicaid patient to an entity for the provision of designated health services ("DHS") if the physician (or an immediate family member) has a financial relationship with that entity. The term "referral" means "the request by a physician for the item or service" for Medicare Part B services and "the request or establishment of a plan of care by a physician which includes the provision of the designated health service" for all other services. DHS includes "clinical laboratory services"; "physical therapy services"; "occupational therapy services"; "radiology services, including magnetic resonance imaging, computerized axial tomography scans, and ultrasound services"; "radiation therapy services and supplies"; "durable medical equipment and supplies"; "parenteral and enteral nutrients, equipment, and supplies"; "prosthetics, orthotics, and prosthetic devices and supplies"; "home health services"; "outpatient prescription drugs"; "inpatient and outpatient hospital services"; and "outpatient speech-language pathology services." A "financial relationship" includes ownership, investment interest, and compensation arrangements. The Stark Law contains several exceptions, including physician services, in-office ancillary services, ownership in publicly traded securities and mutual funds, rental of office space and equipment, and bona fide employment relationship.
In MCCs, there is no deconvolution required to determine which compounds are biologically active, because each synthesis in an array has only a single product, thus the identity of the compound should be unequivocally known.
== Interactions == Since amitriptyline and its active metabolite nortriptyline are primarily metabolized by cytochromes CYP2D6 and CYP2C19 (see its pharmacology), the inhibitors of these enzymes are expected to exhibit pharmacokinetic interactions with amitriptyline. According to the prescribing information, the interaction with CYP2D6 inhibitors may increase the plasma level of amitriptyline. However, the results in the other literature are inconsistent: the co-administration of amitriptyline with a potent CYP2D6 inhibitor paroxetine does increase the plasma levels of amitriptyline two-fold and of the main active metabolite nortriptyline 1.5-fold, but combination with less potent CYP2D6 inhibitors thioridazine or levomepromazine does not affect the levels of amitriptyline and increases nortriptyline by about 1.5-fold; A case of clinically significant interaction with potent CYP2D6 inhibitor terbinafine has been reported. A potent inhibitor of CYP2C19 and other cytochromes fluvoxamine increases the level of amitriptyline two-fold while slightly decreasing the level of nortriptyline. Similar changes occur with a moderate inhibitor of CYP2C19 and other cytochromes cimetidine: amitriptyline level increases by about 70%, while nortriptyline decreases by 50%. CYP3A4 inhibitor ketoconazole elevates amitriptyline level by about a quarter. On the other hand, cytochrome P450 inducers such as carbamazepine and St. John's Wort decrease the levels of both amitriptyline and nortriptyline Oral contraceptives may increase the blood level of amitriptyline by as high as 90%.
=== Loaded microbubble-enhanced focused ultrasound === Microbubbles are small "bubbles" of mono-lipids that are able to pass through the blood–brain barrier. They form a lipophilic bubble that can easily move through the barrier. One barrier to this however is that these microbubbles are rather large, which prevents their diffusion into the brain. This is counteracted by a focused ultrasound. The ultrasound increases the permeability of the blood–brain barrier by causing interference in the tight junctions in localized areas. This combined with the microbubbles allows for a very specific area of diffusion for the microbubbles, because they can only diffuse where the ultrasound is disrupting the barrier. The hypothesis and usefulness of these is the possibility of loading a microbubble with an active drug to diffuse through the barrier and target a specific area. There are several important factors in making this a viable solution for drug delivery. The first is that the loaded microbubble must not be substantially greater than the unloaded bubble. This ensures that the diffusion will be similar and the ultrasound disruption will be enough to induce diffusion. A second factor that must be determined is the stability of the loaded micro-bubble. This means is the drug fully retained in the bubble or is there leakage. Lastly, it must be determined how the drug is to be released from the microbubble once it passes through the blood–brain barrier. Studies have shown the effectiveness of this method for getting drugs to specific sites in the brain in animal models.
Sources: en.wikipedia.org
Vasodilators are increased (such as nitric oxide and carbon monoxide) reducing afterload with compensatory increase in cardiac output, mixed venous oxygen saturation. Renin is increased (as well as sodium retention in kidneys) secondary to a fall in systemic vascular resistance. FibroTest is a biomarker for fibrosis that may be used instead of a biopsy. Other laboratory studies performed in newly diagnosed cirrhosis may include:
== See also == Curculin, a sweet protein from Malaysia with taste-modifying activity Miraculin, a protein from West Africa with taste-modifying activity Monellin, a sweet protein found in West Africa Stevia, a non-nutritive sweetener up to 150 times sweeter than sugar Lugduname, a sweetening agent up to 300,000 times sweeter than sugar
This should in no way suggest to clinicians or researchers that inhaled particles are not a greater threat than swallowed particles, it merely signifies that a combination of both methods may occur with some particles, no matter the size of or lipo/hydrophilicity of the different particle surfaces.
== Data == SIRIUS is using data from liquid-chromatography tandem mass spectrometry (LC-MS/MS). It requires high-resolution, high mass accuracy MS1 and MS2 data as input. LC is not mandatory for SIRIUS, however is often required to separate individual compounds in complex samples.
GLOBSEC – Global think tank committed to enhancing security, prosperity and sustainability in Europe and throughout the world. Central European Labour Studies Institute or CELSI (Stredoeurópsky inštitút pre výskum práce in Slovak) – Central-european think tank which specializes in broadly defined labor issues, labour markets, and labor policy. Forum Minority Research Institute (Fórum Kisebbségkutató Intézet or Fórum Intézet in Hungarian and Fórum inštitút pre výskum menšín or Fórum inštitút in Slovak) – Think tank focusing on ethnic minorities living in Slovakia, especially Hungarians. International think tanks with presence in Slovakia:
Sources: en.wikipedia.org
==== Productivity loss ==== The estimated loss of human capital and productivity due to labor absenteeism in 2003 amounted to $366.2 billion. On the other hand, the loss of land productivity, which translates into a negative impact on administration, investment in physical and social capital, and the price of land in subsectors such as livestock and commercial agriculture is one of the consequences associated with the presence of an armed conflict. This cost is mainly assumed by farmers who experience the pressure of armed actions in their areas of operation. Within this context, the most serious consequences are related to the devaluation of the properties, the loss of productivity of the land (represented in the products that could potentially have been cultivated in these lands), and the difficulty in managing the efficient production of the lands. According to a study of National Planning, between 1999 and 2003 the estimated costs for the loss of productivity of land represented $140,443.5 million, equivalent to 1.28% of the GDP of the agricultural sector of 2003.
== HbA1c == Hemoglobin A1c (HbA1c) was originally (1958) the designation of one of the factions formed, when doing cation exchange chromatography. The species forming this faction were only later described in detail. It has since been rendered more precisely to be "a stable minor Hb variant formed in vivo by post-translational modification by glucose", containing primarily glycated N-terminal β-chains. The naming of HbA1c derives from hemoglobin type A being separated on cation exchange chromatography. The first fraction to separate, considered to be pure hemoglobin A, was designated HbA0, and the following fractions were designated HbA1a, HbA1b, and HbA1c, in their order of elution. Improved separation techniques have subsequently led to the isolation of more subfractions.
== On-line == On-line mass spectrometry was develop to solve some of the limitations and problem that develop from off-line analysis, such as evaporation and chemical reactions of particles in the filters during long analysis time. On-line Mass spectrometry solves these problems through the collection and analysis of aerosol particles in real time. On-line instruments are very portable and allow for spatial variability to be examined. These portable instruments can be put on many different platforms such as boats, planes, and mobile platforms (e.g. car trailers). An example of this is in the picture at the beginning with the instrumentation attached to an aircraft. Like off-line, on-line mass spectrometry has many different type of instruments, which can be broken up into two types; instruments that measures the chemistry of the particle ensemble (bulk measurement) and those that measure the chemistry of individual particles (single-particle measurement). Thus based on analytical need different instrumentation is used in analysis of the aerosol particles.
Refrigerators 2 to 3 °C (35 to 38 °F), and not greater than maximum refrigerator temperature at 5 °C (41 °F) Freezer, Reach-in −23 to −15 °C (−10 to +5 °F) Freezer, Walk-in −23 to −18 °C (−10 to 0 °F) Freezer, Ice Cream −29 to −23 °C (−20 to −10 °F)
=== Freeze-dried ingredients === Freeze-drying requires the use of heavy machinery and is not something that most campers can do on their own. Freeze-dried ingredients are often considered superior to dehydrated ingredients because they rehydrate at camp faster and retain more flavor than their dehydrated counterparts. Freeze-dried ingredients take so little time to rehydrate that they can often be eaten without cooking them first and have a texture similar to a crunchy chip. Small amounts of freeze-dried ingredients are sometimes available for sale from emergency supply outlets or stores specific to camping. Freeze-dried ingredients that have not been combined into a meal are often hard to find and thus tend to be sought out by campers. One of the first freeze-dried camping foods companies was Backpacker's Pantry in 1951, originally named Dri-lite Foods, invented after an ill-fated Girl Scout camping trip by Anne Benedict, becoming the first adventure food on the market.
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 REV-ERB agonist used mainly in preclinical research. It is not an approved medicine for human use.