circadian rhythm 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 2026-02-11. Numbers and descriptions here follow the published literature rather than marketing material.
In laboratory settings, SR9009 is commonly identified by its molecular structure and its interaction with REV-ERB receptors. Vendors may list it under synonyms such as Stenabolic or REV-ERB agonist, but those names do not define purity or identity. Analytical confirmation typically uses high-performance liquid chromatography with ultraviolet detection or liquid chromatography–mass spectrometry. A reference standard is needed to compare retention time and mass spectrum, because the compound can be confused with related research chemicals.
Handling practices for SR9009 focus on minimizing degradation and contamination. The solid is generally stored desiccated at or below -20 °C, protected from light and moisture. Stock solutions are often prepared in dimethyl sulfoxide or ethanol, then aliquoted to avoid repeated freeze–thaw cycles. Aqueous solubility is low, so formulations for animal studies may require cosolvents or suspending agents. Personnel should follow institutional chemical safety procedures, because toxicological data for humans are incomplete.
Regulatory status varies by country and intended use. Major drug agencies have not granted marketing authorization for SR9009 as a medicine, and it is not listed as a controlled substance in many jurisdictions. It is often sold as a research chemical, a category that may fall outside pharmaceutical manufacturing rules. Buyers should verify local laws and supplier documentation, including certificates of analysis. The lack of standardized quality controls raises concerns about identity, purity, and actual content in products marketed online.
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.
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.
| Property | Value | Notes |
|---|---|---|
| Appearance | White to off-white solid | Visual inspection is not sufficient for identity. |
| Solubility | Soluble in DMSO and ethanol | Low solubility in water. |
| Typical storage | -20 °C, desiccated, dark | Protect from repeated temperature changes. |
| Common analytical method | LC-MS or HPLC-UV | Reference standard required for comparison. |
| Common synonyms | SR9009; Stenabolic; REV-ERB agonist | Vendor naming may vary. |
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.
Research interest in SR9009 grew from studies of circadian biology and metabolic disease. Preclinical reports describe effects on exercise capacity, muscle metabolism, and blood lipid levels in rodents, but these findings come from controlled laboratory settings. The compound has low oral bioavailability in animals, which limits systemic exposure after swallowing. Investigators often use injected routes in experiments to achieve measurable plasma concentrations. Human clinical data are sparse, no approved therapeutic product exists, and whether animal effects translate to humans remains an open question.
Regulatory and sporting contexts treat SR9009 as a prohibited substance in many elite competitions. Its presence on banned lists reflects concerns about performance enhancement and unknown long-term safety. Analytical chemists have developed methods to detect the parent compound and its metabolites in urine and blood. Literature discussions distinguish between in vitro potency, animal pharmacology, and anecdotal human reports. The latter are difficult to verify because products sold online may lack purity or contain different compounds.
Subgroup IIa – Decreased thrombin inactivation, decreased factor Xa inactivation and decreased heparin affinity. Subgroup IIb – Decreased thrombin inactivation and normal heparin affinity. Subgroup IIc – Normal thrombin inactivation, normal factor Xa inactivation and decreased heparin affinity. In the revised system of classification again adopted by the Scientific and Standardization Committee of the International Society on Thrombosis and Haemostasis, type II antithrombin deficiency remains subdivided into three subgroups: the already mentioned type II PE, along with type II RS, where mutations effect the reactive site and type II HBS, where mutations effect the antithrombin heparin binding site. For the purposes of an antithrombin mutational database compiled by members of the Plasma Coagulation Inhibitors Subcommittee of the Scientific and Standardization Committee of the International Society on Thrombosis and Haemostasis, type IIa cases are now classified as type II PE, type IIb cases as type II RS and type IIc cases as type II HBS.
== Veterinary uses == Phenobarbital is one of the first-line drugs of choice to treat epilepsy in dogs, as well as cats. It is also used to treat feline hyperesthesia syndrome in cats when anti-obsessional therapies prove ineffective. It may also be used to treat seizures in horses when benzodiazepine treatment has failed or is contraindicated.
Although very common, nipple pain and nipple trauma (cracking, open sores) should not be normalized, as these are often signs of a shallow latch or other underlying problem that can be evaluated and fixed. In addition to shallow latch, other causes of nipple pain include, but are not limited to, skin infection or inflammation, blood vessel spasm or the equivalent of Raynaud Syndrome in the breast, mastitis, plugged ducts, and nipple blebs. Pain caused by a problem deep in the breast may also present with nipple pain due to the paths of nerves in the breast. In addition to the serious nature of many of these causes, nipple pain is a common reason for a mother stopping breastfeeding, so mothers experiencing nipple pain must be evaluated.
==== GABA and anesthetics ==== Lots of general anesthetics work by changing how GABA acts in the brain. Drugs such as propofol, etomidate, barbiturates, and many gases like isoflurane and sevoflurane cause GABAa receptors to become more active. When these receptors become more active, GABA open chloride channels for a longer time, which causes nerve cells to be less likely to send signals. GABAa receptors can become desensitized to GABA and stop opening when the ligand is attached. Anesthetics work in two main ways: enhancing the effectiveness of GABA molecules, and manipulating the GABAa receptor to become less susceptible to desensitization. The slowing of brain activity from increased chloride movement causes the body to calm down, become drowsy, and eventually end up in an unconscious state that is needed for surgery. Some anesthetics can even activate GABAa receptors without GABA even being present. The various types of GABA receptors have drug specific reactions which cause the differing effects of anesthetics.
Sources: en.wikipedia.org
== Preservation == Organic compounds originally in living organisms can be preserved in the rock record if certain requirements are met. Proper preservation requires ample supply of organic material, high burial of that organic matter, and that the organic matter is then polymerized and not degraded. The more degraded a biomolecule is the less specific of a biomarker it becomes, as multiple molecules may have the same hydrocarbon skeleton after diagenesis. However, polar terpenoids such as sugiol may be preserved in their unaltered forms in fossil conifers, potentially due to plant resins that protect them from degradation. In samples obtained from a Pliocene fossilized forest most molecules had been significantly degraded, but phenolic abietanes including sugiol remained intact and identifiable. Even in samples that had been approximately 37.7% decomposed as determined by comparing cellulose content, trace amounts of sugiol and more than 10% ferruginol were detected via GC/MS. Sugiol will remain detectable in a sample long after it has lost its anatomical identifiers, making it extremely useful in identifying extremely old or decomposed plant fossils. In a study of preserved fossil wood and buried samples from a middle Jurassic forest located in Poland, a negative correlation was observed between the preservation of anatomical features of the plant samples versus the chemical features.
== Chemical constituents == Peppermint has a high menthol content. Dried peppermint typically has 0.3–0.4% of volatile oil containing menthol (7–48%), menthone (20–46%), menthyl acetate (3–10%), menthofuran (1–17%), and 1,8-cineol (3–6%). Peppermint contains terpenoids and flavonoids such as eriocitrin, hesperidin, and kaempferol 7-O-rutinoside.
Nanoparticles present possible dangers, both medically and environmentally. Most of these are due to the high surface to volume ratio, which can make the particles very reactive or catalytic. They are also thought to aggregate on phospholipid bilayers and pass through cell membranes in organisms, and their interactions with biological systems are relatively unknown. However, it is unlikely the particles would enter the cell nucleus, Golgi complex, endoplasmic reticulum or other internal cellular components due to the particle size and intercellular agglomeration. A recent study looking at the effects of ZnO nanoparticles on human immune cells has found varying levels of susceptibility to cytotoxicity. There are concerns that pharmaceutical companies, seeking regulatory approval for nano-reformulations of existing medicines, are relying on safety data produced during clinical studies of the earlier, pre-reformulation version of the medicine. This could result in regulatory bodies, such as the FDA, missing new side effects that are specific to the nano-reformulation. However considerable research has demonstrated that zinc nanoparticles are not absorbed into the bloodstream in vivo. Concern has also been raised over the health effects of respirable nanoparticles from certain combustion processes. Preclinical investigations have demonstrated that some inhaled or injected noble metal nano-architectures avoid persistence in organisms. As of 2013 the U.S. Environmental Protection Agency was investigating the safety of the following nanoparticles:
Mahathir reclaimed Carcosa Hill, which had been given to the British by Tunku Abdul Rahman after independence as a sign of good faith, and was home to the British High Commissioner's residence. Mahathir developed a close friendship with Thatcher, leading to strengthened bilateral relations between the two countries during their tenure. Thatcher once praised Mahathir as a truly remarkable national leader and described Malaysia as a textbook example of how to build a prosperous nation. After Thatcher's 1985 visit to Malaysia, bilateral ties improved significantly. Key progress included enhanced trade, particularly in palm oil exports and British technology imports, as well as increased educational cooperation through scholarships for Malaysian students in the UK. Malaysia-UK relations were back on track, leading to Malaysia being chosen to host two major world events — the Commonwealth Heads of Government Meeting in Langkawi in 1989 and the Commonwealth Games in 1998. Mahathir spoke of his good working relationship with Thatcher, saying, "Malaysians should remember that she visited Kuala Lumpur three times — no other British PM has done this before or since." During John Major's visit to Malaysia in September 1993, five memorandums of understanding, involving several billion ringgit, were signed between Malaysian and British companies.
Properly speaking, BaP is a procarcinogen, meaning that its mechanism of carcinogenesis depends on its enzymatic metabolism to BaP diol epoxide It intercalates in DNA, and the electrophilic epoxide is attacked by nucleophilic guanine bases, forming a bulky guanine adduct.
Sources: en.wikipedia.org
== Positions held == 1998 – Elected councilor, Sandur Town Panchayat 2004 – Elected MLA from Sandur representing Janata Dal (Secular) 2007 – Joined Indian National Congress 2008 – Elected MLA from Kalaghatgi representing Indian National Congress 2010 – Appointed general secretary of KPCC 2010 – Appointed Raichur District in charge by KPCC 2013 – Wins second time in a row as MLA from Kalaghatgi 2013 – Appointed Minister of State for Information and Infrastructure 2023 - Appointed Labour minister of Karnataka. 2026- Appointed Labour and Employment minister of Karnataka.
== Further reading == Milosevic, V., Edelmann, R.J., Fosse, J.H., Östman, A., Akslen, L.A. (2022). Molecular Phenotypes of Endothelial Cells in Malignant Tumors. In: Akslen, L.A., Watnick, R.S. (eds) Biomarkers of the Tumor Microenvironment. Springer, Cham. https://doi.org/10.1007/978-3-030-98950-7_3
Stem cell-based therapies: Mesenchymal stem cells or induced pluripotent stem cells (iPSCs) can be differentiated into tenocytes in vitro. These cells offer an almost unlimited source for expanding tendon-like cells, which could be used for tendon repair and regeneration. However, their differentiation protocols still require optimization to achieve functional tenocytes that closely mimic the native tendon environment. Tendon tissue engineering: Combining tenocytes (or stem cells) with biomaterials, such as scaffolds, that mimic the natural tendon extracellular matrix is a promising avenue for tendon repair. These scaffolds can provide structural support and guide the differentiation and organization of tendon cells. Gene editing: Techniques like CRISPR-Cas9 could be used to enhance the tenogenic properties of stem cells or to correct defects in autologous tenocytes derived from the patient's own tissue. This approach could allow for more controlled and efficient tendon regeneration.
=== Anesthesia machine preparation === Anesthesia for people with known susceptibility to MH requires avoidance of triggering agent concentrations above 5 parts per million (all volatile anesthetic agents and succinylcholine). Most other drugs are safe (including nitrous oxide), as are regional anesthetic techniques. Where general anesthesia is planned, it can be provided safely by either flushing the machine or using charcoal filters. To flush the machine, first remove or disable the vaporizers and then flush the machine with 10 L/min or greater fresh gas flow rate for at least 20 minutes. While flushing the machine the ventilator should be set to periodically ventilate a new breathing circuit. The soda lime should also be replaced. After machine preparation, anesthesia should be induced and maintained with non-triggering agents. The time required to flush a machine varies for different machines and volatile anesthetics. This prevention technique was optimized to prepare older generation anesthesia machines. Modern anesthetic machines have more rubber and plastic components which provide a reservoir for volatile anesthetics, and should be flushed for 60 minutes. Charcoal filters can be used to prepare an anesthesia machine in less than 60 seconds for people at risk of malignant hyperthermia. These filters prevent residual anesthetic from triggering malignant hyperthermia for up to 12 hours, even at low fresh gas flows. Prior to placing the charcoal filters, the machine should be flushed with fresh gas flows greater than 10 L/min for 90 seconds.
Sources: en.wikipedia.org
Liquid chromatography–mass spectrometry is common for identity and purity checks. High-performance liquid chromatography with ultraviolet detection can also be used. Both methods require a suitable reference standard.
The solid is usually kept desiccated at -20 °C or lower and protected from light. Stock solutions are aliquoted to limit freeze–thaw cycles. Aqueous solutions are not generally recommended for long-term storage.
Laws differ by country and by intended use. It is not an approved medicine, and many vendors sell it as a research chemical. Purchasers are responsible for confirming local restrictions.
SR9009 is a synthetic compound investigated as an agonist of the nuclear receptors REV-ERBα and REV-ERBβ. It is used in preclinical research on circadian rhythm and metabolism. It is not an approved drug.