If you have been reading about bioavailability 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.
Last reviewed on 2025-10-11. Where a claim depends on a specific study, the study is described rather than over-claimed.
Regulatory treatment of SR9009 reflects its investigational status. The compound has no approved human therapeutic indication, and sports authorities prohibit its use. It appears on anti-doping lists as a non-approved substance or metabolic modulator, depending on the list version. Products sold online as research chemicals are not quality-controlled medicines, so their identity and purity can differ from the label. Such products may also contain unlisted compounds, which complicates both testing and safety assessment.
Scientific discussion of SR9009 often separates animal evidence from human anecdote. Rodent studies provide controlled data on endurance, metabolism, and gene expression, but they use specific strains, doses, and treatment durations. Human reports are mostly uncontrolled and cannot establish cause and effect. Open questions include oral bioavailability, tissue distribution, metabolic stability, and long-term effects. Review articles generally call for more rigorous pharmacokinetic and safety research before any clinical use could be considered.
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.
SR9009 binds REV-ERB receptors and alters their repressive activity on target genes. This action can change transcription of genes involved in lipid handling, glucose metabolism, and mitochondrial function. In rodent studies, treated animals have shown changes in muscle oxidative capacity and exercise performance, though effects vary by dose, duration, and model. The precise molecular steps connecting receptor binding to whole-body outcomes are still an active area of investigation. Findings in animals do not automatically translate to humans.
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.
| Property | Value | Notes |
|---|---|---|
| Regulatory status | Not approved for human use | Investigational status in most countries |
| Sports status | Prohibited by WADA | Classified as non-approved or metabolic modulator |
| Common analytical method | LC-MS/MS | Used for trace detection in biological samples |
| Typical test matrices | Urine and blood | Sample choice depends on testing program |
| Human trial data | None published | Effects and safety are not established |
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.
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.
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 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.
=== Effects of Temperature === All enzymes work within a range of temperature specific to the organism. Increases in temperature generally lead to increases in reaction rates. There is a limit to the increase because higher temperatures lead to a sharp decrease in reaction rates. This is due to the denaturating (alteration) of protein structure resulting from the breakdown of the weak ionic and hydrogen bonding that stabilize the three-dimensional structure of the enzyme active site. The "optimum" temperature for human enzymes is usually between 35 and 40 °C. The average temperature for humans is 37 °C. Human enzymes start to denature quickly at temperatures above 40 °C. Enzymes from thermophilic archaea found in the hot springs are stable up to 100 °C. However, the idea of an "optimum" rate of an enzyme reaction is misleading, as the rate observed at any temperature is the product of two rates, the reaction rate and the denaturation rate. If you were to use an assay measuring activity for one second, it would give high activity at high temperatures, however if you were to use an assay measuring product formation over an hour, it would give you low activity at these temperatures.
Cholesterol is the principal sterol of all animals, distributed in body tissues, especially the brain and spinal cord, and in animal fats and oils. Cholesterol is biosynthesized by all animal cells and is an essential structural and signaling component of animal cell membranes. In vertebrates, hepatic cells typically produce the greatest amounts of it. In the brain, astrocytes produce cholesterol and transport it to neurons. It is absent among prokaryotes (bacteria and archaea), although there are some exceptions, such as Mycoplasma, which require cholesterol for growth. Cholesterol also serves as a precursor for the biosynthesis of steroid hormones, bile acid, and vitamin D. Elevated levels of cholesterol in the blood, especially when bound to low-density lipoprotein (LDL, often referred to as "bad cholesterol"), may increase the risk of cardiovascular disease. François Poulletier de la Salle first identified cholesterol in solid form in gallstones in 1769. In 1815, chemist Michel Eugène Chevreul named the compound "cholesterine".
=== Online === "How to Raise Orphaned Kittens". Pet Education. Archived from the original on 15 July 2011. Retrieved 7 March 2011. "Kittens Deaths ('Fading Kittens')". International Cat Care. Archived from the original on 13 April 2016. Retrieved 28 March 2015. "Kitten". Oxford Dictionary. Archived from the original on July 18, 2012. Retrieved 15 September 2005. "When Does a Kitten Become a Cat?". Santa Maria Times. 11 July 2010. Retrieved 12 October 2013. "When Do Puppies and Kittens Lose Their Baby Teeth?". Veterinary Medicine. Archived from the original on 11 February 2017. Retrieved 1 November 2013.
Sources: en.wikipedia.org
"Cid", "Lucy", "Sidney", "Blotters", "Droppers", "Sugar Cubes") O-Acetylpsilocin (believed to be a prodrug of psilocin) psilocin (found in psilocybin mushrooms) psilocybin (also found in psilocybin mushrooms; prodrug to psilocin) ibogaine (found in Tabernanthe iboga ("Iboga")) Atypicals salvinorin A (found in Salvia divinorum, a trans-neoclerodane diterpenoid ("Diviner's Sage", "Lady Salvia", "Salvinorin")) tetrahydrocannabinol (found in cannabis)
=== Production === Polystyrene foams are produced using blowing agents that form bubbles and expand the foam. In expanded polystyrene, these are usually hydrocarbons such as pentane, which may pose a flammability hazard in manufacturing or storage of newly manufactured material, but have relatively mild environmental impact. Extruded polystyrene is usually made with hydrofluorocarbons (HFC-134a), which have global warming potentials of approximately 1000–1300 times that of carbon dioxide. In Europe, where HFC-134a was banned since beginning 2022, XPS is produced using carbon dioxide as blowing agent, achieving an ODP (Ozone depletion potential) of 0 and a GWP (Global warming potential) below 5. Packaging, particularly expanded polystyrene, is a contributor of microplastics from both land and maritime activities.
=== Differential diagnosis === Juvenile idiopathic arthritis may closely resemble the clinical presentation of some osteochondrodysplasias or genetic skeletal dysplsias. In that, both conditions can present with swollen, stiff and deformed joints. Type II collagen disorders are caused by variants in the COL2A1 gene. Type II collagen disorders can result in mild disease or severe which can cause death within weeks of birth. Infants with the severe form of the disease would be born with clear indications of the disease, such as disproportionate short stature, skeletal dysplasia, distinctive eye abnormalities, cleft palate, and others. However, infants with mild disease may only experience arthritis at birth, but may progress to more severe disease later in life. Early diagnosis can be challenging. Furthermore, type II collagenopathies have significant phenotypic overlap with conditions such as MPS. Guidelines are available to ensure healthcare professional are aware of the conditions and the symptoms of disease to support efficient diagnosis.
Sources: en.wikipedia.org
Animals, not humans, serve as reservoir species for rabies and are responsible for passing the virus to humans in the overwhelming majority of cases. Therefore to eliminate rabies in an area is to eliminate rabies from the local animal populations, both wild and domestic. Pre-exposure immunization has been used on domesticated and wild populations. In many jurisdictions, domestic dogs, cats, ferrets, and rabbits are required to be vaccinated.
Lactic acid bacteria ferments the sugars into lactic acid and yeast makes ethanol, which through aging and secondary fermentation makes numerous flavor compounds typical of soy sauce. Pressing: The fully fermented grain slurry is placed into cloth-lined containers and pressed to separate the solids from the liquid soy sauce. The isolated solids are used as fertilizer or fed to animals while the liquid soy sauce is processed further. Pasteurization: The raw soy sauce is heated to eliminate any active yeasts and molds remaining in the soy sauce and can be filtered to remove any fine particulates. Storage: The soy sauce can be aged or directly bottled and sold.
A familiar example of the opposite, a shear thinning fluid, or pseudoplastic fluid, is wall paint: The paint should flow readily off the brush when it is being applied to a surface but not drip excessively. Note that all thixotropic fluids are extremely shear thinning, but they are significantly time dependent, whereas the colloidal "shear thinning" fluids respond instantaneously to changes in shear rate. Thus, to avoid confusion, the latter classification is more clearly termed pseudoplastic. Another example of a shear thinning fluid is blood. This application is highly favoured within the body, as it allows the viscosity of blood to decrease with increased shear strain rate.
A distinction is made between two primary types of joint work. In the case of mink'a, people work together for projects of common interest (such as the construction of communal facilities). Ayni is, in contrast, reciprocal assistance, whereby members of an ayllu help a family to accomplish a large private project, for example, house construction, and in turn can expect to be similarly helped later with a project of their own. In almost all Quechua ethnic groups, many traditional handicrafts are an important aspect of material culture. This includes a tradition of weaving handed down from Inca times or earlier, using cotton, wool (from llamas, alpacas, guanacos, and vicuñas), and a multitude of natural dyes, and incorporating numerous woven patterns (pallay). Houses are usually constructed using air-dried clay bricks (tika, or in Spanish adobe), or branches and clay mortar ("wattle and daub"), with the roofs being covered with straw, reeds, or puna grass (ichu). The disintegration of the traditional economy, for example, regionally through mining activities and accompanying proletarian social structures, has usually led to a loss of both ethnic identity and the Quechua language. This is also a result of steady migration to large cities (especially Lima), which has resulted in acculturation by Hispanic society there.
Sources: en.wikipedia.org
No. It is an investigational compound without approved therapeutic indications. It is sold for research purposes only in many jurisdictions.
Sports authorities prohibit it because it is not approved for human use and has potential performance-enhancing effects. It appears on anti-doping lists under non-approved or metabolic modulator categories.
Detection usually uses liquid chromatography-tandem mass spectrometry. The method targets the parent compound or its metabolites in urine or blood.
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.