certificate of analysis raises a handful of sensible questions. This page answers them in order, starting with the fundamentals and moving to applications.
This page was last updated on 2026-05-31 and is reviewed periodically as new material appears.
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 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 |
|---|---|---|
| Chemical class | Synthetic small-molecule REV-ERB agonist | Not a hormone or natural product |
| Primary targets | REV-ERBα and REV-ERBβ | Nuclear receptors involved in circadian and metabolic regulation |
| Appearance | White to off-white solid | Typical for purified research samples |
| Solubility | Soluble in DMSO and ethanol; low water solubility | Laboratory solubility depends on solvent and purity |
| Common synonyms | SR9009; Stenabolic | Stenabolic is a colloquial name, not a formal chemical name |
The mechanism of action involves binding to REV-ERB receptors and recruiting corepressor complexes, which represses target gene transcription. This contrasts with many nuclear receptor agonists that activate transcription. Downstream effects may include changes in autophagy, mitochondrial biogenesis, and lipid handling, but the precise pathways remain an active area of study. Whether these molecular events translate into meaningful physiological effects in humans is unresolved. Most evidence comes from cultured cells and rodent models rather than human participants.
SR9009 is a synthetic small molecule developed as an agonist of the nuclear receptors REV-ERBα (NR1D1) and REV-ERBβ (NR1D2). These receptors help regulate circadian rhythms and metabolic gene expression. In cell and animal studies, SR9009 alters transcription of genes involved in lipid metabolism, inflammation, and mitochondrial function. It is not an approved medicine, and its pharmacological profile in humans remains largely uncharacterized. The compound is frequently discussed in the context of circadian biology and metabolic research rather than clinical use.
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.
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.
Stability depends on physical form, temperature, light exposure, and solvent. Solid SR9009 is generally stored cold and dry, with protection from light to limit degradation. Dimethyl sulfoxide stocks are common for laboratory work, but repeated freeze-thaw cycles can reduce compound integrity. Aqueous solutions may be less stable than organic stocks, and the ethyl ester in the structure can be susceptible to hydrolysis under certain conditions. Researchers typically validate storage conditions and recheck purity before quantitative experiments, especially when using archived material.
Regulatory treatment of SR9009 varies by country and region. It is not approved as a pharmaceutical, and several jurisdictions restrict its sale for human consumption. Some authorities classify it as a research chemical, a prescription-only substance, or a prohibited performance-enhancing agent in sport. Purchasers may encounter certificates of analysis, but these documents do not guarantee identity, purity, or legality. In research settings, institutional safety reviews and controlled procurement help ensure that materials are handled under appropriate oversight. The absence of harmonized rules means that legal status can change and requires verification.
Analytical identification of SR9009 typically relies on liquid chromatography coupled with tandem mass spectrometry. In biological samples, researchers first separate the compound from matrix components using protein precipitation, liquid-liquid extraction, or solid-phase extraction. High-performance liquid chromatography with ultraviolet detection and nuclear magnetic resonance spectroscopy can support structural confirmation of reference materials. Because SR9009 is a small, relatively lipophilic molecule, reverse-phase columns and acidic mobile phases are common. Laboratories often include isotope-labeled internal standards to improve quantification and to correct for ion suppression.
Handling recommendations for SR9009 in a laboratory setting include storing the solid at low temperature, protected from light and moisture. The compound is often dissolved in dimethyl sulfoxide or ethanol for experiments. Solutions should be prepared with appropriate personal protective equipment and disposed of according to local rules. Stability data for long-term storage are limited, so stock solutions are typically kept cold and used within defined periods. Records of preparation date and concentration support reproducibility.
SR9009 is not approved as a medicine by major regulatory agencies. It is commonly sold as a research chemical, a category that may fall outside customary drug approval and quality rules. In sports, the World Anti-Doping Agency lists SR9009 as a prohibited substance. Athletes who use it can face sanctions if it is detected in a sample. Legal status varies by country, and importation may be restricted. Enforcement practices differ across borders.
=== Phase 1 === AH-001 – topical – alopecia – ubiquitin-protein ligase expression stimulant AMP-303 – intradermal – alopecia – undefined mechanism of action (polysaccharide) CKD-843 – oral, injection – alopecia – undefined mechanism of action CKR-051 – transdermal – alopecia – CXXC5 protein inhibitor, Wnt signalling pathway stimulant DR-01 – parenteral – alopecia areata – antibody-dependent cell cytotoxicity, T lymphocyte stimulant ET-02 (RS-5441) – topical – alopecia, hair disorders – undefined mechanism of action (targets and restores hair follicle stem cells) FOL-100 – topical – alopecia – undefined mechanism of action OLX-72021 – intradermal injection – alopecia – RNA interference QY-201 – oral – alopecia areata – Janus kinase 1 inhibitor, TYK2 kinase inhibitor SCO-240 – oral – alopecia – somatostatin receptor 5 modulator Squaric acid dibutyl ester (SQX-770) – topical – alopecia areata – immunomodulator VDAA – topical – alopecia areata – undefined mechanism of action
Department of State, Marco Rubio, which designates the non-existent Cartel of the Suns as a terrorist organization," saying it is "an infamous and vile lie to justify an illegitimate and illegal intervention against Venezuela, under the classic US regime-change format."
Particle-induced X-ray emission or proton-induced X-ray emission (PIXE) is a technique used for determining the elemental composition of a material or a sample. When a material is exposed to an ion beam, atomic interactions occur that give off EM radiation of wavelengths in the X-ray part of the electromagnetic spectrum specific to an element. PIXE is a powerful, yet non-destructive elemental analysis technique now used routinely by geologists, archaeologists, art conservators and others to help answer questions of provenance, dating and authenticity. The technique was first proposed in 1970 by Sven Johansson of Lund University, Sweden, and developed over the next few years with his colleagues Roland Akselsson and Thomas B Johansson. Recent extensions of PIXE using tightly focused beams (down to 1 μm) gives the additional capability of microscopic analysis. This technique, called microPIXE, can be used to determine the distribution of trace elements in a wide range of samples. A related technique, particle-induced gamma-ray emission (PIGE) can be used to detect some light elements. Additionally, there is a multiplexed instrument combining PIXE with mass spectrometry of molecules: PDI-PIXE-MS or PIXE-MS.
=== Crystal structure === In 2019, Chadeayne and colleagues solved the crystal structure of the fumarate salt of 4-HO-DPT. The authors describe the structure as follows: "The asymmetric unit contains one 4-HO-DPT cation, protonated at the dipropylamine N atom. There are also two independent water molecules, and half of a fumarate ion present."
=== January === 1 January Helen Hogan, educator (Hillmorton High School, WEA), editor of poetry anthologies, and Māori studies scholar (born 1923). Lyn Fleming, Police senior sergeant and first policewoman in New Zealand to be killed in the line of duty (born 1963). 2 January – Lex Clark, Olympic rower (1964) (born 1943). 3 January Kate Coolahan, commercial artist, fashion illustrator, printmaker, and design educator (Wellington Polytechnic) (born 1929). Dame Tariana Turia, politician, Labour list MP (1996–2002), MP for Te Tai Hauāuru (2002–2014), co-leader of the Māori Party (2004–2014), Minister for the Community and Voluntary Sector (2003–2004, 2008–2011), Minister for Disability Issues (2009–2014), Minister for Whānau Ora (2010–2014) (born 1944). 5 January Philippa Blair, artist (born 1945). Lou Robinson, structural engineer and heritage advocate (born 1943). 7 January – Arthur Pomeroy, classical scholar (Victoria University of Wellington), chess player and administrator (born 1953). 18 January – Russell Marshall, politician and diplomat, MP for Wanganui (1972–1990), Minister of Education (1984–1987), Minister of Foreign Affairs (1987–1990), chancellor of Victoria University of Wellington (2000–2002), High Commissioner to the United Kingdom (2002–2005) (born 1936). 19 January – David Johnston, disaster researcher (Massey University) (born 1966). 20 January – Richard Hipa, Niuean public servant and politician, Secretary of Government (2008–2017), Member of the Niue Assembly (2020–2023) (born 1957). 21 January Diana Beaglehole, historian (born 1938).
Sources: en.wikipedia.org
Synaptic plasticity, a particular type of neuroplasticity, is the ability of the nervous system to modify the intensity of interneuronal relationships (synapses), to establish new ones and to eliminate some. This property allows the nervous system to modify its structure and functionality in a more or less lasting way, depending on the events that influence it, such as experience or neuromodulation.
Chicken McNuggets are sold in various portion sizes depending on the country of purchase. In the United States, they come in packs of 4, 6, 10, 20 and 50 (in selected stores). In some markets, including the United Kingdom, they are sold in packs of 4 (as part of a Happy Meal), 6, 9 or 20 (as a "ShareBox"). In New Zealand and Australia, they were also available in 3-packs in Happy Meals and Heart Foundation-approved "Tick healthy" meals. In Canada, Chicken McNuggets are sold in packs of 4 (as part of a Happy Meal), 6, 10, and 20. A 50-piece McNuggets meal deal has been promoted at times for special events such as the NFL's Super Bowl. They have recently been introduced by McDonald's in India, first as a part of its "Breakfast Meal" and later in the regular menu in May 2009. A halal version of the McNuggets has been sold at two franchises in Dearborn, Michigan, beginning in the early 2000s, bringing in double the average sales of regular McNuggets.
== Interaction with other nutrients == Selenium interactes with iodine and vitamin E; see section "Deficiency" above. Selenium interacts with other minerals, such as zinc and copper. High doses of selenium supplements in pregnant animals might disturb the zinc:copper ratio and lead to zinc reduction; in such treatment cases, zinc levels should be monitored. Further studies are needed to confirm these interactions.
The first step in purine biosynthesis is a condensation reaction, performed by glutamine-PRPP amidotransferase. This enzyme transfers the amino group from glutamine to PRPP, forming 5-phosphoribosylamine. The following step requires the activation of glycine by the addition of a phosphate group from ATP. GAR synthetase performs the condensation of activated glycine onto PRPP, forming glycineamide ribonucleotide (GAR). GAR transformylase adds a formyl group onto the amino group of GAR, forming formylglycinamide ribonucleotide (FGAR). FGAR amidotransferase catalyzes the addition of a nitrogen group to FGAR, forming formylglycinamidine ribonucleotide (FGAM). FGAM cyclase catalyzes ring closure, which involves removal of a water molecule, forming the 5-membered imidazole ring 5-aminoimidazole ribonucleotide (AIR). N5-CAIR synthetase transfers a carboxyl group, forming the intermediate N5-carboxyaminoimidazole ribonucleotide (N5-CAIR). N5-CAIR mutase rearranges the carboxyl functional group and transfers it onto the imidazole ring, forming carboxyamino- imidazole ribonucleotide (CAIR). The two step mechanism of CAIR formation from AIR is mostly found in single celled organisms. Higher eukaryotes contain the enzyme AIR carboxylase, which transfers a carboxyl group directly to AIR imidazole ring, forming CAIR. SAICAR synthetase forms a peptide bond between aspartate and the added carboxyl group of the imidazole ring, forming N-succinyl-5-aminoimidazole-4-carboxamide ribonucleotide (SAICAR).
=== Transition and swearing-in ceremony === Melo named Porto Alegre councilman and former mayor of Santa Maria, Cezar Schirmer, as his transition coordinator for the transition between the Marchezan government and his. In his inaugural speech on 1 January 2021, Melo affirmed that was necessary to "raise the optimism" for the city, as the city, due to the COVID-19 pandemic, had been going through rough times economically and socially.
Sources: en.wikipedia.org
=== Komagataella as a genetic model organism === As a genetic model organism, Komagataella can be used for genetic analysis and large-scale genetic crossing, with complete genome data and its ability to carry out complex eukaryotic genetic processing in a relatively small genome. The functional genes for peroxisome assembly were investigated by comparing wild-type and mutant strains of Komagataella.
=== Growth hormone receptor mutations === Molecular genetic investigations have shown that LS is mainly associated with autosomal recessive mutations in the gene for the growth hormone receptor (GHR). These can result in defective hormone binding to the ectodomain or reduced efficiency of dimerization of the receptor after hormone occupancy. LS is generally classified as "primary" GH insensitivity, which is distinguished from "secondary" GH insensitivity. Primary (congenital/hereditary) GH insensitivity may result from growth hormone receptor defects, as in the case of Laron syndrome, but can also be caused by defective post-receptor signal transduction (STAT5B), abnormalities of the IGF-1 gene or IGF-1 receptor. Secondary (acquired) GH insensitivity results from antibodies to growth hormone or the growth hormone receptor, as well as poor nutritional status, liver disease or diabetes mellitus. A GHR mutation that results in only partial insensitivity to GH can manifest as a form of idiopathic short stature.
The influx of refugees troubled the Cossacks, not only because of the increased demand for food but also because their large number meant the Cossacks could not absorb them into their culture by way of the traditional apprenticeship. Instead of taking these steps for proper assimilation into Cossack society, the runaway peasants spontaneously declared themselves Cossacks and lived alongside the true Cossacks, laboring or working as barge-haulers to earn food. Divisions among the Cossacks began to emerge as conditions worsened and Mikhail's son Alexis took the throne. Older Cossacks began to settle and become prosperous, enjoying privileges earned through obeying and assisting the Muscovite system. The old Cossacks started giving up the traditions and liberties that had been worth dying for, to obtain the pleasures of an elite life. The lawless and restless runaway peasants who called themselves Cossacks looked for adventure and revenge against the nobility that had caused them suffering. These Cossacks did not receive the government subsidies that the old Cossacks enjoyed, and had to work harder and longer for food and money.
The Mexican Indians eat the repletes, or living honey-pots, of the honey ant (Myrmecocystus). The sale of ants for consumption is illegal in many countries. It is illegal in South Korea as it is not one of ten insect species approved for human consumption. In 2026, a Michelin-star restaurant came under scrutiny for serving imported ants as a desert garnish.
=== Weight loss === Excess body weight is thought to be an important cause of sleep apnea. People who are overweight have more tissues in the back of their throat which can restrict the airway, especially when sleeping. In weight loss studies of overweight individuals, those who lose weight show reduced apnea frequencies and improved apnoea–hypopnoea index (AHI). Weight loss effective enough to relieve obesity hypoventilation syndrome (OHS) must be 25–30% of body weight. For some obese people, it can be difficult to achieve and maintain this result without bariatric surgery.
Sources: en.wikipedia.org
It is a synthetic research compound that activates REV-ERB nuclear receptors. It is not an approved drug or dietary supplement. Most information comes from cell and animal studies.
It binds REV-ERBα and REV-ERBβ and changes transcription of metabolic genes. This can affect circadian rhythm, lipid use, and mitochondrial function. The full downstream effects are still under study.
No. Some rodent studies show increased endurance, but controlled human trials are lacking. Claims about human performance are not established by published evidence.
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.