NR1D1 comes up often in conversation and rarely with the context attached. Here we lay out the basics in order, then work through the practical considerations.
Last reviewed on 2026-02-26. Where a claim depends on a specific study, the study is described rather than over-claimed.
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.
SR9009 is a synthetic small molecule studied as an agonist of REV-ERB nuclear receptors. REV-ERB alpha and REV-ERB beta help regulate circadian rhythms and metabolic gene expression. In laboratory research, SR9009 has been used to probe how these receptors affect skeletal muscle, liver, and adipose tissue. The compound was identified in academic drug-discovery work and is often described in scientific literature by its chemical name and research code. It is not an approved medicine, and human clinical data remain limited or absent.
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.
Preclinical reports describe effects on exercise endurance, mitochondrial content, and lipid profiles in rodents, but these findings come from specific experimental conditions. Many studies use high doses or delivery methods that may not translate directly to human use. SR9009 has been reported to have low oral bioavailability and a short half-life, which complicates interpretation of oral dosing studies. It is not established as safe or effective for any indication. Literature discussions often separate its pharmacological mechanism from unverified claims made in fitness and supplement markets.
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.
| Property | Value | Notes |
|---|---|---|
| Chemical class | Synthetic REV-ERB agonist | Small-molecule nuclear receptor ligand |
| Appearance | Off-white to pale yellow solid | Typical for research-grade powder |
| Solubility class | Soluble in DMSO; low water solubility | Common stock solutions use organic solvent |
| Typical stock solvent | Dimethyl sulfoxide | Used for laboratory assays |
| Common analytical method | HPLC with UV or mass detection | Used for identity and purity checks |
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.
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.
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.
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.
Preclinical reports have linked SR9009 to improved endurance and altered energy expenditure in rodents. Such findings have prompted interest in whether REV-ERB activation can influence skeletal muscle metabolism. However, the reported effects depend on dose, route, and experimental model, and replication across laboratories is limited. Human trials have not established comparable outcomes, so claims about exercise performance remain speculative. The absence of controlled human data is a central limitation in interpreting these observations.
The relationship between the Druze and Christians in Israel has generally been marked by harmony and peaceful coexistence, with both communities living together in peace, harmony, and friendship. However, there have been rare clashes, including instances of violence by the Druze against Christians, such as the incident in 2005 in the town of town of Maghar. Druze and Christians in Israel participate in each other's cultural events, including births, weddings, funerals, and celebrations like the Christian festival of Mar Ilyas (Saint Elias) in Haifa. Additionally, many Druze students are enrolled in Christian schools across the Galilee and Haifa regions. Some Druze towns are situated near significant Christian holy sites, with the most prominent being the Catholic Muhraqa Monastery located 2 kilometres southeast of Daliyat al-Karmel, the largest Druze town in Israel, and marks the contest between prophet Elijah and the priests of Ba'al. It belongs to the Carmelite Order. In the predominantly Druze town of Hurfeish, there is the Church and House of Saint Mariam Baouardy. Interaction between Christians, including members of the Maronite, Eastern Orthodox, Melkite, and other churches, and the Unitarian Druze has resulted in the establishment of mixed villages and towns in Galilee region, Mount Carmel, and the Israeli-occupied portion of the Golan Heights. These include Abu Snan, Daliyat al-Karmel, Ein Qiniyye, Hurfeish, Isfiya, Kafr Yasif, Kisra-Sumei, Majdal Shams, Maghar, Peki'in, Rameh and Shefa-Amr, where more than 82,000 Druze and 30,000 Christians reside together.
==== Ebola treatment ==== In 2014, the FDA added an Ebola treatment being developed by Canadian pharmaceutical company Tekmira to the Fast Track program, but halted the phase 1 trials in July pending the receipt of more information about how the drug works. This was widely viewed as increasingly important in the face of a major outbreak of the disease in West Africa that began in late March 2014 and ended in June 2016.
== Applications == The triple quadrupole mass spectrometer allows for increased sensitivity and specificity yielding lower detection and quantitation limits. For these reasons, employment of the TQMS is a vital asset in the fields of drug metabolism, pharmacokinetics, environmental studies, and biological analyses. In most drug and pharmacokinetic studies, animals like rats, are subjected to a new drug in order to probe how the substance metabolizes in the body. By analyzing the rat’s urine or plasma with a triple quadrupole coupled to liquid chromatography, the concentration and fragmentation pattern of the new drug can be determined. In environmental and biological studies, the triple quadrupole is useful for quantitative studies that involved identifying whether or not specific substances are present in a sample. One of the more common uses of a triple quadrupole mass analyzer is for structural elucidation, which provides information about fragmentation patterns. However, a mass spectrum only provides information about fragmentation, which isn't enough information to fully deduce the structure of a molecule or compound. So for the purpose of structural elucidation, it is paired with data obtained from other analytical methods, like nuclear magnetic resonance (NMR) spectroscopy and infrared spectroscopy (IR), for a more accurate analysis.
Pizotifen is a serotonin antagonist acting mainly at the 5-HT2A, 5-HT2B, and 5-HT2C receptors. It also has some activity as an antihistamine as well as some anticholinergic activity. The drug binds non-selectively to many targets, including serotonin, dopamine, adrenergic, histamine, and muscarinic acetylcholine receptors. Besides its serotonin 5-HT2 receptor antagonism, pizotifen is a low-potency moderate-efficacy partial agonist of the serotonin 5-HT1A receptor. Pizotifen is able to dose-dependently and fully antagonize the discriminative stimulus effects of the serotonin–norepinephrine–dopamine releasing agent and serotonin 5-HT2 receptor agonist MDMA in rodent drug discrimination tests. Conversely, the related drug cyproheptadine was only partially effective and clozapine was ineffective. All three of these agents, pizotifen, cyproheptadine, and clozapine act as non-selective monoamine receptor antagonists. Pizotifen also fully blocks the effects of serotonergic psychedelics, including LSD, mescaline, 5-MeO-DMT, and DOM, in drug discrimination tests. The antimigraine activity of pizotifen might be specifically due to serotonin 5-HT2B receptor blockade.
Sources: en.wikipedia.org
== Advantages and limitations == A major advantage of ABPP is the ability to monitor the availability of the enzyme active site directly, rather than being limited to protein or mRNA abundance. Ideal ABPs would target a large, but manageable, number of enzymes (tens to hundreds) to provide researchers with a global view of the functional state of the proteome. This degree of target promiscuity must be balanced by minimal cross-reactivity with unrelated proteins. Most ABPs achieve this combination of intraclass coverage and limited extraclass reactivity by coupling appropriate reactive groups with binding elements that recognize conserved mechanistic or structural features within enzyme active sites. Furthermore, ABPP could be used to target specific proteins which were previously viewed as undruggable targets. A disadvantage of ABPs is that their design is somewhat restricted by the need to attach an electrophile or photocrosslinker, which can limit chemical diversity. Another potential drawback is that covalent modification of the active site irreversibly inhibits the target enzyme. However, in many cases it is possible to use concentrations of ABP such that only a small fraction of the active enzyme pool is labeled, minimizing perturbation of overall enzymatic activity.
Jasleen Kaur is named as the winner of the 2024 Turner Prize. 4 December Cheshire Constabulary confirms they have interviewed Lucy Letby under caution in prison about further baby deaths. The former prime minister, Boris Johnson, accuses Starmer of misleading the House of Commons and says he should correct the record immediately. This follows an exchange in the House during PMQs when Starmer, answering a question from the leader of the opposition, Kemi Badenoch, said that "two of her predecessors had convictions for breaking the Covid rules". Although the former Conservative prime ministers, Johnson and Rishi Sunak had received fixed penalty notices for breaking COVID-19 regulations, neither had any criminal convictions. 5 December – The Princess of Wales hosts her annual Christmas carol service at Westminster Abbey. 6 December Data published by the Halifax Bank indicates house prices rose by 1.3% in November 2024, marking the fifth consecutive month of growth, with the average house price now estimated at £298,083. Around three million people in Wales and South West England are sent emergency alerts as Storm Darragh approaches the UK. The owners of The Observer confirm the newspaper has been sold to Tortoise Media. The Royal Mint unveils a collector's edition £5 coin featuring Sir Paul McCartney. The UK government announces a £500m contract to build 14 "state-of-the-art" trains at Hitachi's Newton Aycliffe factory, securing the facility's future.
=== Antiquity === Aristotle used the word frequently in his philosophy, both to describe the organs of plants or animals (e.g. the roots of a tree, the heart or liver of an animal) because, in ancient Greek, the word 'organon' means 'tool', and Aristotle believed that the organs of the body were tools for us by means of which we can do things. For similar reasons, his logical works, taken as a whole, are referred to as the Organon because logic is a tool for philosophical thinking. Earlier thinkers, such as those who wrote texts in the Hippocratic corpus, generally did not believe that there were organs of the body but only different parts of the body. Some alchemists (e.g. Paracelsus) adopted the Hermetic Qabalah assignment between the seven vital organs and the seven classical planets as follows:
Sources: en.wikipedia.org
When the reagent is methane, the predominant reaction is proton transfer M + CH5+ → (MH)+ + CH4. When the reagent is ammonium, the predominant reaction is proton transfer M + NH4+ → (MH)+ + NH3. When the reagent is isobutane, the reaction may be proton transfer M + (CH3)3C+ → (MH)+ + (CH3)2C=CH2 or adduct formation M + (CH3)3C+ → (M · C(CH3)3)+. CI can also produce negatively charged analyte ions by proton abstraction or adduct formation. For example, ionized NF3 contains F−, which abstracts proton.
=== Europe === Hardtack, baked with or without the addition of fat, was and still is a staple in Russian military rations, especially in the Navy, as infantry traditionally preferred simple dried bread when long shelf life was needed. Called galeta (галета) in Russian, it is usually somewhat softer and more crumbly than traditional hardtack, as most varieties made in Russia include at least some fat or shortening, making them closer to saltine crackers. One such variety, khlyebtsy armyeyskiye (хлебцы армейские), or "army crackers", is included in Russian military rations. Other brands enjoy significant popularity among the civilian population as well, both among campers and the general populace. In Genoa, hardtack was and still is a traditional addition to a fish and vegetable salad called cappon magro. In Germany, hardtack is included in every military ration and colloquially known as Panzerplatten (armor plates) or Panzerkekse (armor cookies/tank cookies). Due to conscription for many years a large part of the male population knew about them from their service and thus they became somewhat popular even in civilian use. The company that makes them also sells them unaltered to the civilian market. They are said to have many properties, some jokingly assigned, such as the ability to combine them with standard issue shoe polish to create a flammable device, or to glue them onto vehicles to increase their armor protection.
== Effectiveness == Most injector pens are designed for subcutaneous injection just under the skin, but some are designed for injection into muscle. The desired injection site and the skin profile at the injection site will determine what needle length is appropriate for a person to use. For products with included needles, such as epinephrine pens, different brands may have different included needle lengths, which must be taken into account. Multiple studies have shown that many people prefer the use of injector pens over other forms of injectable medication, such as vial and syringe. Injector pens in general have also been shown to be at least as effective therapeutically as other injection methods. One study of the use of injector pens for insulin administration found that the chance a person initiated on insulin continued therapy for at least 12 months was higher with insulin pens than with vial and syringe administration. The same study found that the increase in adherence to therapy resulted in increased short-term pharmacy costs (i.e. for the pens/needles) but resulted in an overall decrease in healthcare costs related to diabetes. Insulin pens have also been shown to provide a higher quality of life than traditional injection methods. A 2011 systematic review which examined preference of insulin pens over vial and syringe administration found that in almost all studies and surveys a majority of people preferred insulin pens. The effectiveness of an injector pen can also depend on the technique used to inject.
Sources: en.wikipedia.org
SR9009 is a synthetic research compound that acts on REV-ERB nuclear receptors. It is not approved for human use and is sold only as a research chemical. Its effects have been studied mainly in cells and rodents.
It binds REV-ERB alpha and REV-ERB beta and changes the expression of genes tied to metabolism and circadian rhythm. These changes can affect mitochondria and energy use in animal models. The exact chain from receptor binding to physiological outcome is still being mapped.
No reliable human trials show that SR9009 improves athletic performance. Some rodent studies report endurance changes, but these results are not proof of human benefit. Its use in sport is prohibited, and quality and safety data are lacking.
SR9009 is a synthetic REV-ERB agonist used in laboratory research. It is not an approved drug, and its effects in humans are not well characterized. It is often sold as a research chemical under the name Stenabolic.