A practical reference on anti-doping testing: what it is, how it behaves, what the literature reports, and where the honest uncertainties sit.
Reviewed 2026-08-01. Anything still debated is marked as such rather than presented as settled.
Analytical chemists detect SR9009 with liquid chromatography-tandem mass spectrometry, commonly abbreviated LC-MS/MS. Sample preparation may involve protein precipitation, liquid-liquid extraction, or solid-phase extraction before analysis. Laboratories can target the parent compound or its metabolites, depending on the matrix and the purpose of testing. Anti-doping methods require sensitive and specific assays because concentrations in biological samples can be low. Reference standards and validated methods are essential for reliable identification and quantification.
Regulatory agencies have not approved SR9009 for human therapeutic use. It is typically sold as a research chemical with labels stating that it is not for human consumption. The World Anti-Doping Agency prohibits the substance in sport, generally under the category of non-approved substances. Customs and national laws may restrict importation, sale, or possession. Product quality and legal status can vary by country and vendor, and therapeutic claims are not permitted in regulated advertising because the compound lacks approval.
Several misconceptions surround SR9009. It is often described as a SARM, a steroid, or an exercise pill, but its known target is the REV-ERB receptor family. Rodent studies have examined exercise capacity and metabolic markers, yet human outcomes remain unproven. Oral bioavailability appears low in animals, and human pharmacokinetics are not well characterized. Online products may contain impurities or different compounds, so identity and purity testing are important for research use.
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.
| Property | Value | Notes |
|---|---|---|
| Regulatory status | Not approved for human use | Research-use-only status in many markets |
| WADA status | Prohibited in sport | Generally listed as a non-approved substance |
| Detection technique | LC-MS/MS | Common for urine and blood analysis |
| Common alias | Stenabolic | Informal market nickname, not a pharmacopoeial name |
| Purity check | HPLC or LC-UV | Independent certificate of analysis is typical |
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.
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.
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.
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.
Analytical methods for SR9009 typically rely on liquid chromatography coupled with tandem mass spectrometry. The technique can separate the parent compound from related substances and detect low concentrations in biological matrices. Urine and blood are common samples in anti-doping testing, while in vitro studies may use cell culture media. Rapid metabolism and low expected concentrations make method validation important for reliable identification. Exact metabolite patterns can vary by species and are not fully mapped.
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.
=== Children === In most countries, fluoroquinolones are only approved for use in children under narrowly defined circumstances, owing in part to the observation of high rates of musculoskeletal adverse events in fluoroquinolone-treated juvenile animals. The use of fluoroquinolones in those 18 years of age and under is only FDA approved for complicated UTI's (pyelonephritis and for postexposure prophylaxis) and treatment of inhalation anthrax. In the UK, the prescribing indications for fluoroquinolones for children are severely restricted. Only inhalational anthrax and pseudomonal infections in cystic fibrosis infections are licensed indications in the UK due to ongoing safety concerns. In a study comparing the safety and efficacy of levofloxacin to that of azithromycin or ceftriaxone in 712 children with community-acquired pneumonia, serious adverse events were experienced by 6% of those treated with levofloxacin and 4% of those treated with comparator antibiotics. Most of these were considered by the treating physician to be unrelated or doubtfully related to the study drug. Two deaths were observed in the levofloxacin group, neither of which was thought to be treatment-related. Spontaneous reports to the U.S. FDA Adverse Effects Reporting System at the time of the 20 September 2011 U.S. FDA Pediatric Drugs Advisory Committee included musculoskeletal events (39, including five cases of tendon rupture) and central nervous system events (19, including five cases of seizures) as the most common spontaneous reports between April 2005 and March 2008.
=== Possible health risks === Some evidence suggests that T. molitor may pose a health risk, as humans and animals can consume the eggs and larvae of the beetle with grain-based food. Although they are usually either digested or are excreted with feces, sometimes, they are able to survive and live in the alimentary tract. The first cases of T. molitor larvae in human organs date back to the 19th century, where their presence was observed in the gastrointestinal tract, including the stomach and intestines. There were other cases, such as a reported ulcer infestation of T. molitor in an AIDS patient and a concerned urinary canthariasis in a ten-year-old boy in Iran in 2019, which was the last reported human case of canthariasis caused by T. molitor. However, there are very few reported cases of live larvae in animals, and there are no reports of gastrointestinal canthariasis in farm animals. A study analysing the results of patients in Poland for the presence of specific IgE antibodies to the mealworm was conducted prior to its widespread introduction as a food ingredient. Sensitisation to the mealworm was detected in 4.3% of the patients, with monosensitisation occurring rarely and affecting 0.7% of this group. It was determined that the presence of antibodies to the mealworm most often co-occurs with sensitization to other edible insects, such as the house cricket and the migratory locust, as well as to tropomyosins from shrimp and house dust mites. The primary or cross-sensitization may differ in different populations depending on the dietary habits or geographical zone.
=== Interactions and contraindications === Taking SAM at the same time as some drugs may increase the risk of serotonin syndrome, a potentially dangerous condition caused by having too much serotonin. These drugs include, but are certainly not limited to, dextromethorphan (Robitussin), meperidine (Demerol), pentazocine (Talwin), and tramadol (Ultram). SAM can also interact with many antidepressant medications — including tryptophan and the herbal medicine Hypericum perforatum (St. John's wort) — increasing the potential for serotonin syndrome or other side effects, and may reduce the effectiveness of levodopa for Parkinson's disease. SAM can increase the risk of manic episodes in people who have bipolar disorder.
The use of concrete in construction grew rapidly from 1850 onward, and was soon the dominant use for cements. Thus Portland cement began its predominant role. Isaac Charles Johnson further refined the production of meso-Portland cement (middle stage of development) and claimed he was the real father of Portland cement. Setting time and "early strength" are important characteristics of cements. Hydraulic limes, "natural" cements, and "artificial" cements all rely on their belite (2 CaO · SiO2, abbreviated as C2S) content for strength development. Belite develops strength slowly. Because they were burned at temperatures below 1,250 °C (2,280 °F), they contained no alite (3 CaO · SiO2, abbreviated as C3S), which is responsible for early strength in modern cements. The first cement to consistently contain alite was made by William Aspdin in the early 1840s: This was what we call today "modern" Portland cement. Because of the air of mystery with which William Aspdin surrounded his product, others (e.g., Vicat and Johnson) have claimed precedence in this invention, but recent analysis of both his concrete and raw cement have shown that William Aspdin's product made at Northfleet Cement Works, Kent was a true alite-based cement. However, Aspdin's methods were "rule-of-thumb": Vicat is responsible for establishing the chemical basis of these cements, and Johnson established the importance of sintering the mix in the kiln.
Sources: en.wikipedia.org
The Hamley group have also carried out investigations of palmitoyl-KTTKS, and found it so self-assemble into nano tapes in the pH range 3–7, in addition to stimulating human dermal and corneal fibroblasts in a concentration dependant manner, suggesting that stimulation occurs above the critical aggregation concentration. There exist some rarer forms of protein acylation that may not have a membrane-related function. They include serine O-octanoylation in ghrelin, serine O-palmitoleoylation in Wnt proteins, and O-palmitoylation in histone H4 with LPCAT1. Hedgehog proteins are double-modified by (N-)palmitate and cholesterol. Some skin ceramides are proteolipids. The amino group on lysine can also be myristoylation via a poorly-understood mechanism.
lampbrush chromosome A transcriptionally active, highly de-condensed morphology assumed by certain chromosomes during the diplotene stage of meiotic prophase I in the progenitor cells of oocytes in female insects, amphibians, birds, and some other animals. Lampbrush chromosomes are conspicuous under the microscope because the post-synaptic homologs, still attached at chiasmata, are gigantically elongated into large loops of unpackaged euchromatin extending laterally from a series of chromomeres. Large numbers of messenger RNAs and non-coding RNAs are transcribed from the lateral loops, generating a rich pool of transcripts to be used in the immature oocyte and after fertilization, with functions in both oogenesis and embryogenesis. Because they allow individual transcription units to be directly visualized, lampbrush chromosomes are useful models for studying chromosome organization and genome structure and for constructing high-resolution chromosome maps.
Within the first two days after birth, kittens acquire passive immunity from their mother's milk. Milk within the first few days of parturition is called colostrum and contains high concentrations of immunoglobulins. These include immunoglobulin A and immunoglobulin G, which cross the neonatal intestinal barrier. The immunoglobulins and growth factors found in the colostrum begin to establish and strengthen the weak immune system of the offspring. Kittens are able to chew solid food around 5–6 weeks after birth, and it is recommended that 30% of their diet consist of solid food at this time. The kitten remains on the mother's milk until around eight weeks of age, when weaning is complete and solid food becomes the primary food source.
=== Other === Some people with aphantasia have been reported to have acquired visual mental imagery after using psychedelics. While enhanced mental imagery may seem appealing, it may also pose risks such as increased risk of psychiatric disorders.
Juxtacrine signaling is a type of intercellular communication that is transmitted via oligosaccharide, lipid, or protein components of a cell membrane, and may affect either the emitting cell or the immediately adjacent cells. It occurs between adjacent cells that possess broad patches of closely opposed plasma membrane linked by transmembrane channels known as connexons. The gap between the cells can usually be between only 2 and 4 nm.
Sources: en.wikipedia.org
Emus form breeding pairs during the summer months of December and January and may remain together for about five months. During this time, they stay in an area a few kilometres in diameter and it is believed they find and defend territory within this area. Both males and females put on weight during the breeding season, with the female becoming slightly heavier at between 45 and 58 kg (99 and 128 lb). Mating usually takes place between April and June; the exact timing is determined by the climate as the birds nest during the coolest part of the year. During the breeding season, males experience hormonal changes, including an increase in luteinising hormone and testosterone levels, and their testicles double in size. Males construct a rough nest in a semi-sheltered hollow on the ground, using bark, grass, sticks and leaves to line it. The nest is almost always a flat surface rather than a segment of a sphere, although in cold conditions the nest is taller, up to 7 cm (2.8 in) tall, and more spherical to provide some extra heat retention. When other material is lacking, the bird sometimes uses a spinifex tussock a metre or so across, despite the prickly nature of the foliage. The nest can be placed on open ground or near a shrub or rock. The nest is usually placed in an area where the emu has a clear view of its surroundings and can detect approaching predators. The nest can contain eggs from multiple emus: the number is usually between 15 and 25 eggs.
=== Autism === An intranasal formulation of carbetocin was also under development for the treatment of autism, but development was discontinued as well. It was variously developed by Nastech Pharmaceutical Company, Retrophin (Travere Therapeutics), Marina Biotech, and Cypress Bioscience and had the developmental code name CYP-2001. The drug reached phase 1 trials for autism prior to being discontinued.
The term "computer virus" may be used as an overarching phrase to include all types of true viruses, malware, including computer worms, Trojan horses, most rootkits, spyware, dishonest adware and other malicious and unwanted software (though all are technically unique), and proves to be quite financially lucrative for criminal organizations, offering greater opportunities for fraud and extortion whilst increasing security, secrecy and anonymity. Worms may be utilized by organized crime groups to exploit security vulnerabilities (duplicating itself automatically across other computers a given network), while a Trojan horse is a program that appears harmless but hides malicious functions (such as retrieval of stored confidential data, corruption of information, or interception of transmissions). Worms and Trojan horses, like viruses, may harm a computer system's data or performance. Applying the Internet model of organized crime, the proliferation of computer viruses and other malicious software promotes a sense of detachment between the perpetrator (whether that be the criminal organization or another individual) and the victim; this may help to explain vast increases in cyber-crime such as these for the purpose of ideological crime or terrorism. In mid July 2010, security experts discovered a malicious software program that had infiltrated factory computers and had spread to plants around the world. It is considered "the first attack on critical industrial infrastructure that sits at the foundation of modern economies," notes the New York Times.
Other scientists have stated that this allegation of venom glands "has had the effect of underestimating the variety of complex roles played by oral secretions in the biology of reptiles, produced a very narrow view of oral secretions and resulted in misinterpretation of reptilian evolution". According to these scientists "reptilian oral secretions contribute to many biological roles other than to quickly dispatch prey". These researchers concluded, "Calling all in this clade venomous implies an overall potential danger that does not exist, misleads in the assessment of medical risks, and confuses the biological assessment of squamate biochemical systems." Evolutionary biologist Schwenk says that even if the lizards have venom-like proteins in their mouths they may be using them for a different function, and he doubts venom is necessary to explain the effect of a Komodo dragon bite, arguing that shock and blood loss are the primary factors. Although the mouths of Komodo dragons have been confirmed to contain venom glands with venom in them, it is not clear whether this venom has any serious effect on prey, as opposed to the damage caused by the bite itself. As of 2023, no clear unambiguous evidence of Komodo dragon bites having serious venom effects has been presented. A 2025 histochemical characterisation of the venom glands of the Komodo dragon confirmed the presence of several types of toxins, though the authors note that a venom depositing and draining structure has yet to be identified in lizard teeth, and stress that their study is restricted by specimen availability.
In vitro, VPg-RNA conjugates were translated with similar efficiency to m7G-capped RNAs indicating that VPg binds eIF4E and engages the translation machinery; while free VPg (in the absence of conjugated RNA) successfully competes for all the cap-dependent activities of eIF4E in the cell inhibiting translation and RNA export.
Sources: en.wikipedia.org
Legality depends on the country and the intended use. In many places it is not approved as a medicine and may be sold only as a research chemical. Importation or possession can be restricted, and sports organizations prohibit it.
Anti-doping laboratories typically use LC-MS/MS to detect SR9009 or its metabolites in urine or blood. The exact assay depends on the laboratory and the testing program. Detection can be challenging because the compound may be rapidly metabolized and present at low levels.
Stenabolic is an informal nickname used in online fitness and research-chemical markets, not an official drug name. It likely references reported effects on endurance in rodent studies. The nickname does not imply approval or proven human benefit.
SR9009 is a synthetic research compound that activates the REV-ERBα and REV-ERBβ nuclear receptors. It is not an approved drug and has no established human therapeutic use. Most published biological data come from cell and rodent studies.