REV-ERB agonist raises a handful of sensible questions. This page answers them in order, starting with the fundamentals and moving to applications.
Reviewed 2025-11-08. Anything still debated is marked as such rather than presented as settled.
Research interest in SR9009 grew from studies showing improved running endurance in mice after short treatment periods. Those experiments linked the compound to increased mitochondrial content and fatty acid oxidation in muscle, but the findings come from animal models and specific dosing schedules. Independent replication has been limited, and the pathways connecting REV-ERB activation to exercise performance are still being mapped. Whether similar responses occur in humans is an open question.
SR9009 is often grouped with compounds studied for circadian and metabolic regulation rather than with classical anabolic steroids. Its interactions with nuclear receptors differ from those of androgen receptor ligands, and its proposed mechanisms involve transcriptional control rather than direct hormone signaling. Some sources classify it as a metabolic modulator because of observed effects on energy utilization. The distinction matters for regulation and for interpreting research results across different compound classes.
Detection in biological samples can be complicated by rapid metabolism and low circulating concentrations. Some studies report phase I and phase II metabolites, and analytical methods may need to target those species in addition to the parent compound. Immunoassays are not broadly available, so mass spectrometry remains the main confirmatory approach. For anti-doping testing, laboratories look for SR9009 and its metabolites using validated LC-MS methods. Open questions include how long metabolites remain detectable and how different routes of administration alter detection windows.
In laboratory settings, SR9009 is typically characterized by liquid chromatography–mass spectrometry (LC-MS) or high-performance liquid chromatography with ultraviolet detection (HPLC-UV). These methods can confirm identity and estimate purity, but they require reference standards for accurate quantification. Because SR9009 is not a licensed pharmaceutical, no harmonized pharmacopeial monograph exists. Laboratories often validate in-house methods for matrices such as plasma, urine, or cell culture media. Sample preparation may involve protein precipitation or liquid-liquid extraction before analysis.
Physicochemical behavior influences handling. SR9009 is described as a solid with limited aqueous solubility, so organic solvents such as dimethyl sulfoxide or ethanol are common in research stock solutions. Aqueous dilution can produce precipitates if the organic content is too low. Light, heat, and repeated freeze-thaw cycles may affect stability. Storage recommendations usually specify a desiccated freezer environment protected from light, but exact stability data depend on the formulation and matrix.
| Property | Value | Notes |
|---|---|---|
| Molecular formula | C20H24ClN3O4S | Reported for the free base |
| Molecular weight | 437.9 g/mol | Calculated from the formula |
| Primary target | REV-ERBα and REV-ERBβ | Nuclear receptors involved in circadian regulation |
| Solubility | Soluble in DMSO and ethanol | Poorly soluble in water |
| Typical storage | -20 °C, desiccated | Protect from light and moisture |
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.
Quality control for research materials includes identity confirmation by nuclear magnetic resonance and purity assessment by high-performance liquid chromatography. Mass spectrometry provides molecular weight confirmation and can detect related impurities. Purchasers should request a certificate of analysis that lists lot-specific data. Online products advertised for human use often lack such documentation. Distinguishing legitimate research material from mislabeled or contaminated samples is a recurring challenge in independent testing, and independent laboratories may use orthogonal methods to verify identity.
Detection of SR9009 in biological samples usually relies on liquid chromatography coupled to tandem mass spectrometry. This approach separates the compound from matrix components and identifies it by mass transitions. Because SR9009 can undergo metabolism, laboratories often look for both parent drug and specific metabolites. Sample preparation may involve protein precipitation or solid-phase extraction. Method validation examines sensitivity, carryover, and interference from related substances, and reference standards are required for accurate calibration.
=== After age 35 === After age 35, acquired coronary artery disease predominates (80%), and this is true regardless of the athlete's former level of fitness. Various performance-enhancing drugs can increase cardiac risk, though evidence has been inconclusive about their involvement in sudden cardiac deaths.
=== Planting === The sacred lotus requires a nutrient-rich and loam soil. In the beginning of the summer period (from March until May in the northern hemisphere), a small part of rhizome with at least one eye is either planted in ponds or directly into a flooded field. It can also be propagated via seeds or buds. Furthermore, tissue culture is a promising propagation method for the future to produce high volumes of uniform, true-to-type, disease-free materials. The first step of cultivation is to plough the dry field. One round of manure is applied after ten days, before flooding the field. To support a quick initial growth, the water level is relatively low and increases when plants grow. Then a maximum of approximately 4,000 per hectare (1,600/acre) with grid spacing of 1.2 by 2 metres (3 ft 11 in × 6 ft 7 in) are used to plant directly into the mud 10–15 cm (3+7⁄8–5+7⁄8 in) below the soil surface.
=== Memory effects === Both of these two types of mechanism can display enzyme memory, with very different causes and consequences in the two cases. In ternary complex mechanisms, these are possible if the mechanism includes slow processes and the binding steps are not at quasi-equilibrium, because the intermediates may be swept away very fast. This can generate cooperativity, even in monomeric enzymes. In a substituted-enzyme mechanism, slow steps are not needed to generate memory effects. Instead, for an enzyme with several alternative substrates, the kinetic properties of the second half reaction may vary with different substrates in the first half reaction, even though the same substituted enzyme seems to be transformed. Reversible catalysis and the Haldane equation
The definitive breakthrough came from the Russian chemist Dmitri Mendeleev. Although other chemists (including Meyer) had found some other versions of the periodic system at about the same time, Mendeleev was the most dedicated to developing and defending his system, and it was his system that most affected the scientific community. On 17 February 1869 (1 March 1869 in the Gregorian calendar), Mendeleev began arranging the elements and comparing them by their atomic weights. He began with a few elements, and over the course of the day his system grew until it encompassed most of the known elements. After he found a consistent arrangement, his printed table appeared in May 1869 in the journal of the Russian Chemical Society. When elements did not appear to fit in the system, he boldly predicted that either valencies or atomic weights had been measured incorrectly, or that there was a missing element yet to be discovered. In 1871, Mendeleev published a long article, including an updated form of his table, that made his predictions for unknown elements explicit. Mendeleev predicted the properties of three of these unknown elements in detail: then-missing heavier homologues of boron, aluminium, and silicon; he named them eka-boron, eka-aluminium, and eka-silicon ("eka" being Sanskrit for "one"). In 1875, the French chemist Paul-Émile Lecoq de Boisbaudran, working without knowledge of Mendeleev's prediction, discovered a new element in a sample of the mineral sphalerite, and named it gallium. He isolated the element and began determining its properties.
In many of these countries, flower farmers could choose a location for year-round plant production based on the altitude, cooler crops higher in the mountains, warmer crops at lower altitudes and offer work and income to the local population. This led to an increase in the taxa used as cut flowers across the world.
Sources: en.wikipedia.org
It was proposed to expand the list of the nine hallmarks of aging with five more. Saudi Arabia has started a not-for-profit organization called "the Hevolution Foundation" with budget $1 billion per year for developing anti-aging technology.
=== Dermal patch vaccines === An experimental needle-free vaccine delivery system is undergoing animal testing. A stamp-size patch similar to an adhesive bandage contains about 20,000 microscopic projections per square cm. This dermal administration potentially increases the effectiveness of vaccination, while requiring less vaccine than injection.
=== Blood plasma and serum === In addition to purified proteins, DSC has been applied to unfractionated blood plasma and serum; the diluted fluid is measured directly, without labeling. The resulting curve, called a thermogram, approximates the sum of the combined denaturation profiles of the most abundant plasma proteins, weighted by their concentrations. Because these proteins interact, the additivity is not exact. For plasma from healthy donors scanned at 1 °C per minute, three independant research groups reported a fibrinogen transition at about 51 °C, a dominant albumin peak near 62–63 °C, immunoglobulin and other globulin transitions between roughly 68 and 75 °C, and a weak transferrin transition at about 85 °C. Serum exhibits a similar profile, except that the fibrinogen transitions are absent. Calorimetric measurements of serum and plasma from cancer patients were documented as early as the 1990s by a team in Tbilisi, who observed broadened heat-absorption curves shifted toward higher temperatures compared to healthy controls. From 2007, Chaires, Garbett and colleagues at the University of Louisville reported that plasma from healthy individuals gave a characteristic, reproducible thermogram. Samples from patients with cervical cancer, Lyme disease, rheumatoid arthritis or systemic lupus erythematosus displayed altered profiles.
In 1996 Merck paid $1.8 million for polluting the air. New machines were installed to reduce smog emissions by 680,000 lb (310,000 kg) a year. In November 1993, Merck & Co. acquired Medco Containment Services for $6 billion. Merck & Co. spun Medco off ten years later. Merck's supply chain reduction programme has been referred to as an example of successful change. Merck reduced its number of global suppliers from 40,000 to less than 10,000 during the period from 1992 to 1997.
Sources: en.wikipedia.org
It is a synthetic REV-ERB agonist used mainly in preclinical research. It is not an approved medicine for human use.
It binds to REV-ERBα and REV-ERBβ, nuclear receptors involved in circadian and metabolic gene regulation. This can alter transcription of genes related to lipid and glucose metabolism in experimental models.
No controlled human trials have established that effect. Endurance findings come primarily from rodent studies, and human responses remain unknown.
It is usually detected by LC-MS or HPLC-UV against a reference standard. In biological matrices, metabolite targeting can improve detection. No universal immunoassay is widely available.