anti-doping is one of those subjects where the details matter more than the headlines. This page pulls together the background, the mechanisms, and the practical points readers ask about most.
Updated 2026-07-05. Numbers and descriptions here follow the published literature rather than marketing material.
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.
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.
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.
| 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 |
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.
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.
SR9009 binds REV-ERB receptors and alters their repressive activity on target genes. This action can change transcription of genes involved in lipid handling, glucose metabolism, and mitochondrial function. In rodent studies, treated animals have shown changes in muscle oxidative capacity and exercise performance, though effects vary by dose, duration, and model. The precise molecular steps connecting receptor binding to whole-body outcomes are still an active area of investigation. Findings in animals do not automatically translate to humans.
Because REV-ERB receptors are core clock components, SR9009 has been examined for effects on daily rhythms as well as metabolism. Research has explored whether the compound can shift or reinforce circadian gene expression in tissues such as liver and muscle. Some studies report improved metabolic markers in obese or diabetic mice, while others show context-dependent responses. Questions remain about which effects are direct, which are secondary to timing, and how they might differ across species.
Tarlov cysts, also known as perineural cysts, are cerebrospinal fluid (CSF)-filled lesions that most commonly develop in the sacral region of the spinal canal (S1–S5), and less frequently in the cervical, thoracic, or lumbar spine. These cysts form as dilations of the nerve root sheath near the dorsal root ganglion, specifically within the perineural space between the endoneurium and perineurium. A defining feature is that the cyst walls contain nerve fibers, which often line the inner cavity of the cyst itself. This involvement of neural elements distinguishes Tarlov cysts from other extradural meningeal cysts, such as meningeal diverticula, which do not contain nerve fibers. The etiology of these cysts is not well understood; some current theories explaining this phenomenon include increased spinal fluid pressure, filling of congenital cysts with one-way valves, and/or inflammation in response to trauma and disease. They are named after an American neurosurgeon Isadore Tarlov, who described them in 1938. These cysts are often detected during MRI or CT scans. They are also observed using magnetic resonance neurography with communicating subarachnoid cysts of the spinal meninges. Cysts with diameters of 1cm or larger are more likely to be symptomatic; although cysts of any size may be symptomatic dependent on location and etiology. Some 40% of patients with symptomatic Tarlov cysts can associate a history of trauma or childbirth.
Aceclidine is a parasympathomimetic cholinergic drug that functions as a muscarinic acetylcholine receptor agonist. It is used in ophthalmology as a miotic agent to constrict the pupil. Historically used in Europe for the treatment of glaucoma, aceclidine received its first U.S. approval in 2025 under the brand name Vizz as a topical eye drop for the correction of presbyopia. Its mechanism of action produces pupil contraction with a relatively minimal effect on the ciliary muscle, which improves near visual acuity through a "pinhole" depth-of-field effect without inducing significant accommodative spasm.
=== Hydrides, carbides and nitrides === Uranium metal heated to 250 to 300 °C (482 to 572 °F) reacts with hydrogen to form uranium hydride. Even higher temperatures will reversibly remove the hydrogen. This property makes uranium hydrides convenient starting materials to create reactive uranium powder along with various uranium carbide, nitride, and halide compounds. Two crystal modifications of uranium hydride exist: an α form that is obtained at low temperatures and a β form that is created when the formation temperature is above 250 °C. Uranium carbides and uranium nitrides are both relatively inert semimetallic compounds that are minimally soluble in acids, react with water, and can ignite in air to form U3O8. Carbides of uranium include uranium monocarbide (UC), uranium dicarbide (UC2), and diuranium tricarbide (U2C3). Both UC and UC2 are formed by adding carbon to molten uranium or by exposing the metal to carbon monoxide at high temperatures. Stable below 1800 °C, U2C3 is prepared by subjecting a heated mixture of UC and UC2 to mechanical stress. Uranium nitrides obtained by direct exposure of the metal to nitrogen include uranium mononitride (UN), uranium dinitride (UN2), and diuranium trinitride (U2N3).
Crustacean hyperglycaemic hormone (CHH). CHH is primarily involved in blood sugar regulation, but also plays a role in the control of moulting and reproduction. Moult-inhibiting hormone (MIH). MIH inhibits Y-organs where moulting hormone (ecdysteroid) is secreted. A moulting cycle is initiated when MIH secretion diminishes or stops. Gonad-inhibiting hormone (GIH), also known as vitellogenesis-inhibiting hormone (VIH) because of its role in inhibiting vitellogenesis in female animals. Mandibular organ-inhibiting hormone (MOIH). MOIH represses the synthesis of methyl farnesoate, the precursor of insect juvenile hormone III in the mandibular organ. Ion transport peptide (ITP) from locust. ITP stimulates salt and water reabsorption and inhibits acid secretion in the ileum of the locust. Caenorhabditis elegans uncharacterised protein ZC168.2. These neurohormones are peptides of 70 to 80 amino acid residues which are processed from larger precursors. They contain six conserved cysteines that are involved in disulfide bonds.
Sources: en.wikipedia.org
However, some studies have also shown that malolactic fermentation may diminish primary fruit aromas such as Pinot noir, often losing raspberry and strawberry notes after MLF. Additionally, red wines may endure a loss of color after MLF due to pH changes that causes a shift in the equilibrium of the anthocyanins which contribute to the stability of color in wine.
During the First World War (1914–1918), and for a short period afterwards, there were at least 250 recognised airfields in France that the Royal Flying Corps, Royal Naval Air Service, and Royal Air Force used at various times.
Naturally occurring iodine (53I) consists of one stable isotope, 127I, and is a mononuclidic element for atomic weight. Radioisotopes of iodine are known from 108I to 147I. The longest-lived of those, 129I, has a half-life of 16.14 million years, which is too short for it to exist as a primordial nuclide. It is, however, found in nature as a trace isotope and universally distributed, produced naturally by cosmogenic sources in the atmosphere and by natural fission of the actinides. Today, however, most is artificial as fission product; like krypton-85 the contribution of past nuclear testing and of operating reactors are dwarfed by release from nuclear reprocessing. All other iodine radioisotopes have half-lives less than 60 days, and four of these are used as tracers and therapeutic agents in medicine – 123I, 124I, 125I, and 131I. All industrial use of radioactive iodine isotopes involves these four. In addition, one other isotope has a half-life in the same range – 126I (12.93 days; decays almost equally to tellurium or to xenon). The isotope 135I has a half-life less than seven hours, which is inconveniently short for those purposes. However, the unavoidable in situ production of this isotope is important in nuclear reactor control, as it decays to 135Xe, the most powerful known neutron absorber, and the nuclide responsible for the so-called iodine pit phenomenon. In addition to commercial production, 131I (half-life 8 days) is one of the common radioactive fission products of nuclear fission, and thus occurs in large amounts inside nuclear reactors.
== Function == LRP5 acts as a co-receptor with LRP6 and the Frizzled protein family members for transducing signals by Wnt proteins through the canonical Wnt pathway. This protein plays a key role in skeletal homeostasis.
Part C states, which were chief commissioners' provinces and some princely states, each governed by a chief commissioner appointed by the President of India. The ten Part C states were Ajmer, Bhopal, Bilaspur, Coorg, Delhi, Himachal Pradesh, Cutch, Manipur, Tripura and Vindhya Pradesh. One Part D state (Andaman and Nicobar Islands) administered by a lieutenant governor appointed by the central government. After the States Reorganisation Act, 1956, Part C and Part D states were combined into a single category of "Union territory". Due to various other reorganisations, only 6 union territories remained:
Sources: en.wikipedia.org
=== Pituitary gland (hypophysis) === The pituitary gland (or hypophysis) is an endocrine gland about the size of a pea and weighing 0.5 grams (0.018 oz) in humans. It is a protrusion off the bottom of the hypothalamus at the base of the brain, and rests in a small, bony cavity (sella turcica) covered by a dural fold (diaphragma sellae). The pituitary is functionally connected to the hypothalamus by the median eminence via a small tube called the infundibular stem or pituitary stalk. The anterior pituitary (adenohypophysis) is connected to the hypothalamus via the hypothalamo–hypophyseal portal vessels, which allows for quicker and more efficient communication between the hypothalamus and the pituitary.
The average gross monthly wage in Moscow is ₽123,688 ($2,000); this wage is around twice the national average of ₽66,572 ($1,000), and it is one of the highest among the federal subjects (constituent entities) of Russia. Moscow is home to the third-highest number of billionaires among cities internationally, and the highest number among cities in Europe. Moscow is Russia's financial center, as well as headquarters for the country's largest banks and many of its largest companies (e.g., energy company Rosneft). Moscow accounts for 17% of Russia's retail sales and 13% of its construction activity. Since the 1998 Russian financial crisis, business sectors in Moscow have shown strong growth. Many business centers and office buildings have been constructed in recent years, but Moscow still has a shortage of office space. As a result, many former industrial and research facilities are being rebuilt for office use. Economic stability has improved overall in recent years; nonetheless, crime and corruption hinder business development.
Mild glutathione synthetase deficiency usually results in the destruction of red blood cells (hemolytic anemia). Rarely, affected people also excrete large amounts of a compound called 5-oxoproline (also called pyroglutamic acid, or pyroglutamate) in their urine (5-oxoprolinuria). This compound builds up when glutathione is not processed correctly in cells. Individuals with moderate glutathione synthetase deficiency may experience symptoms beginning shortly after birth including hemolytic anemia, 5-oxoprolinuria, and elevated acidity in the blood and tissues (metabolic acidosis). In addition to the features present in moderate glutathione synthetase deficiency, individuals affected by the severe form of this disorder may experience neurological symptoms. These problems may include seizures; a generalized slowing down of physical reactions, movements, and speech (psychomotor retardation); intellectual disability; and a loss of coordination (ataxia). Some people with severe glutathione synthetase deficiency also develop recurrent bacterial infections.
Prolyl isomerase (also known as peptidylprolyl isomerase or PPIase) is a class of enzymes (EC 5.2.1.8) found in both prokaryotes and eukaryotes that interconvert the cis and trans isomers of peptide bonds with the amino acid proline. Proline has an unusually conformationally restrained peptide bond due to its cyclic structure with its side chain bonded to its secondary amine nitrogen. Most amino acids have a strong energetic preference for the trans peptide bond conformation due to steric hindrance, but proline's unusual structure stabilizes the cis form so that both isomers are populated under biologically relevant conditions. There are three major classes of proteins with prolyl isomerase activity: cyclophilin and FKBPs which together are referred to as immunophilins, and parvulins. These three classes of proteins are not structurally related. Larger proteins can also contain prolyl isomerase domains.
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.
Laboratories commonly use liquid chromatography coupled with mass spectrometry to detect SR9009. The method can identify the compound and estimate concentration in a sample. Detection limits depend on the matrix and instrument.