If you have been reading about LC-MS/MS 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 2026-01-06. 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.
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.
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.
| 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 |
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.
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.
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.
Mechanistically, SR9009 binds the ligand-binding domain of REV-ERBα/β and enhances recruitment of corepressor complexes. This represses target genes rather than activating them. Because REV-ERB proteins normally compete with ROR proteins at shared response elements, the net effect depends on tissue and timing. Researchers use SR9009 to probe how nuclear receptor signaling links the clock to metabolism, inflammation, and muscle biology. Findings are largely preclinical, and the precise contribution of each receptor subtype remains under study.
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.
In 1929, Adolf Butenandt and Edward Adelbert Doisy independently isolated and purified estrone, the first estrogen to be discovered. Then, estriol and estradiol were discovered in 1930 and 1933, respectively. Shortly following their discovery, estrogens, both natural and synthetic, were introduced for medical use. Examples include estriol glucuronide (Emmenin, Progynon), estradiol benzoate, conjugated estrogens (Premarin), diethylstilbestrol, and ethinylestradiol. The word estrogen derives from Ancient Greek. It is derived from "oestros" (a periodic state of sexual activity in female mammals), and genos (generating). It was first published in the early 1920s and referenced as "oestrin". With the years, American English adapted the spelling of estrogen to fit with its phonetic pronunciation.
Dosing of low-dose oral minoxidil for hair loss has additionally been reviewed. Higher doses are more effective for improving hair loss than lower doses, but also come with greater hypertrichosis incidence. Another option for hair loss treatment is sublingual minoxidil (SLM), which may have improved tolerability with retained efficacy compared to oral minoxidil. Minoxidil requires at least 2 to 4 months before the first benefits on hair growth can be observed. Maximal effectiveness occurs after 12 months.
=== In the West Pacific === Native aluminium has been reported also in cold seeps in the northeastern continental slope of the South China Sea and Chen et al. (2011) have proposed a theory of its origin as resulting by reduction from tetrahydroxoaluminate Al(OH)4− to metallic aluminium by bacteria.
Bone grafting is possible because bone tissue, unlike most other tissues, has the ability to regenerate completely if provided the space into which to grow. As native bone grows, it will generally replace the graft material completely, resulting in a fully integrated region of new bone. The biologic mechanisms that provide a rationale for bone grafting are osteoconduction, osteoinduction and osteogenesis.
Sources: en.wikipedia.org
=== Supplementation === Copper supplements can prevent copper deficiency. Copper supplements are not prescription medicines, and are available at vitamin and herb stores and grocery stores and online retailers. Different forms of copper supplementation have different absorption rates. For example, the absorption of copper from cupric oxide supplements is lower than that from copper gluconate, copper sulfate, or carbonate. Supplementation is generally not recommended for healthy adults who consume a well-balanced diet which includes a wide range of foods. However, supplementation under the care of a physician may be necessary for premature infants or those with low birth weights, infants fed unfortified formula or cow's milk during the first year of life, and malnourished young children. Physicians may consider copper supplementation for 1) illnesses that reduce digestion (e.g., children with frequent diarrhea or infections; alcoholics), 2) insufficient food consumption (e.g., the elderly, the infirm, those with eating disorders or on diets), 3) patients taking medications that block the body's use of copper, 4) anemia patients who are treated with iron supplements, 5) anyone taking zinc supplements, and 6) those with osteoporosis. Many popular vitamin supplements include copper as small inorganic molecules such as cupric oxide. These supplements can result in excess free copper in the brain as the copper can cross the blood-brain barrier directly. Normally, organic copper in food is first processed by the liver which keeps free copper levels under control.
=== Controlling properties === The initial nucleation stages of the synthesis process heavily influence the properties of a nanoparticle. Nucleation, for example, is vital to the size of the nanoparticle. A critical radius must be met in the initial stages of solid formation, or the particles will redissolve into the liquid phase. The final shape of a nanoparticle is also controlled by nucleation. Possible final morphologies created by nucleation can include spherical, cubic, needle-like, worm-like, and more particles. Nucleation can be controlled predominately by time and temperature as well as the supersaturation of the liquid phase and the environment of the synthesis overall.
== RNase L == Ribonuclease L or RNase L (for latent), ais an interferon (IFN)-induced ribonuclease which, upon activation, destroys all RNA within the cell (both cellular and viral) as well as inhibiting mRNA export. RNase L is an enzyme that in humans is encoded by the RNASEL gene in humans.
Sources: en.wikipedia.org
=== Traditional medicine === Xanthoria parietina has a long history of use in traditional medicine across several cultures. In Andalucia, Spain, this lichen was known as flor de piedra ('stone flower') or rompepiedra ('stone breaker'). Spanish traditional healers employed it for several purposes: treating menstrual complaints when prepared as a decoction in wine, addressing kidney disorders and toothaches when made into water-based decoctions, and serving as a general analgesic. They also incorporated it into cough syrups along with various plant ingredients. In European traditional medicine during the early modern era, X. parietina was boiled with milk to treat jaundice, often alongside Polycauliona candelaria. This application exemplifies the Doctrine of signatures – a belief system that plants resembling parts of the body could treat ailments of those parts – as the yellow-orange color of the lichen was thought to indicate its efficacy against the yellowing of the skin in jaundice. In Traditional Chinese medicine, it was known as Chinese: shí huáng yī ('stone yellow clothes') and valued for its antibacterial properties. The widespread medicinal use of lichens, including X. parietina, had been mostly abandoned by 1800, and these applications represent historical folk remedies rather than evidence-based treatments.
=== Brand names === Cyclofenil has been marketed under a variety of brand names including Ciclifen, Fertodur, Gyneuro, Klofenil, Menoferil, Menopax, Neoclym, Oginex, Ondonid, Ondogyne, Rehibin, Sexadieno, Sexovar, and Sexovid.
=== Biological activity === 90Sr is a "bone seeker" that exhibits biochemical behavior similar to calcium, the next lighter group 2 element. After entering the organism, most often by ingestion with contaminated food or water, about 70–80% of the dose gets excreted. Virtually all remaining 90Sr is deposited in bones and bone marrow, with the remaining 1% remaining in blood and soft tissues. Its presence in bones can cause bone cancer, cancer of nearby tissues, and leukemia. Exposure to 90Sr can be tested by a bioassay, most commonly by urinalysis. The biological half-life of 90Sr in humans has variously been reported as 14 to 600 days, 1,000 days, 18 years, 30 years and, at the upper limit, 49 years. The wide-ranging published biological half-life figures are explained by strontium's complex metabolism within the body. However, by averaging all excretion paths, the overall biological half-life is estimated to be about 18 years. The elimination rate of 90Sr is strongly affected by age and sex, due to differences in bone metabolism. Together with cesium-134 (134Cs), 137Cs and iodine-131 (131I), 90Sr was among the most important isotopes regarding health impacts after the Chernobyl disaster. As strontium has an affinity to the calcium-sensing receptor of parathyroid cells that is similar to that of calcium, the increased risk of liquidators of the Chernobyl power plant to suffer from primary hyperparathyroidism could be explained by binding of 90Sr.
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.
Research-grade SR9009 is typically stored frozen at about minus twenty degrees Celsius, protected from light and moisture. Stock solutions are often kept in aliquots to avoid repeated freeze-thaw cycles. Specific storage conditions should follow the supplier's documentation.