A practical reference on bioavailability: what it is, how it behaves, what the literature reports, and where the honest uncertainties sit.
This page was last updated on 2026-04-04 and is reviewed periodically as new material appears.
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 the nuclear receptors REV-ERBα and REV-ERBβ. It is not a steroid, peptide, or natural hormone. In scientific literature, it appears under the code SR9009 and in non-scientific contexts as Stenabolic. The compound was identified through chemical screening efforts aimed at targeting circadian clock components. Its status remains investigational, and no regulatory agency has approved it as a human medicine.
REV-ERB proteins help regulate daily cycles in gene expression, including genes tied to lipid and glucose metabolism. SR9009 binds these receptors and alters their activity in cell and animal experiments. Consequences observed in rodents include changes in skeletal muscle oxidative capacity, blood lipid levels, and exercise performance. The precise chain from receptor occupancy to whole-body effects is still an active area of study. Human responses cannot be assumed from rodent data.
Most published work on SR9009 consists of preclinical studies. It is widely sold as a research chemical, a category that does not imply safety, efficacy, or pharmaceutical-grade quality. Sports anti-doping organizations have listed SR9009 as a prohibited substance, and its presence in an athlete sample can lead to sanctions. Legal status differs by country; in several jurisdictions it is not approved for human consumption and may be treated as an unapproved new drug.
| 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 |
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.
For long-term storage, SR9009 is typically kept as a solid at low temperature, protected from moisture and light. Desiccated conditions limit hydrolysis, while opaque containers reduce photochemical breakdown. Solutions are less stable than solids and are often stored frozen in aliquots to avoid repeated freeze-thaw cycles. Stability data are not standardized across all suppliers, so users should rely on certificate-of-analysis information when available. Degradation may appear as color change, precipitate, or decreased chromatographic purity.
Laboratory identification of SR9009 typically relies on chromatographic separation coupled to mass spectrometry, often with ultraviolet detection as a secondary check. Nuclear magnetic resonance spectroscopy can confirm molecular structure when a reference standard is available. Because many suppliers sell the compound as a research chemical, independent identity testing is important for experimental reproducibility. A single retention time is not sufficient proof of identity, especially when related compounds may be present. Purity assessments usually report a percentage based on area normalization.
SR9009 is generally described as poorly soluble in water and more soluble in organic solvents such as dimethyl sulfoxide and ethanol. Stock solutions are commonly prepared in an organic solvent before dilution into an aqueous buffer or vehicle. Precipitation can occur if the organic fraction is reduced too quickly or if the final concentration exceeds the compound's solubility limit. Sonication or gentle warming may aid dissolution in some protocols, but excessive heat can promote degradation. Container material and pH can also influence observed solubility.
=== Medieval pharmacology === Al-Kindi's ninth century AD book, De Gradibus and Ibn Sina (Avicenna)'s The Canon of Medicine, covers a range of drugs known to the practice of medicine in the medieval Islamic world. Medieval medicine of Western Europe saw advances in surgery compared to previously, but few truly effective drugs existed, beyond opium (found in such extremely popular drugs as the "Great Rest" of the Antidotarium Nicolai at the time) and quinine. Folklore cures and potentially poisonous metal-based compounds were popular treatments. Theodoric Borgognoni, (1205–1296), one of the most significant surgeons of the medieval period, responsible for introducing and promoting important surgical advances including basic antiseptic practice and the use of anaesthetics. Garcia de Orta described some herbal treatments that were used.
== Environmental impacts == Trifluoroacetic acid is mildly phytotoxic. Uncertainties remain in our understanding of the potential impacts on the environment of TFA. A debate is ongoing regarding its ecological risk due to its persistence, ubiquity in the environment and increasing concentrations globally. TFA exposure is widespread and increasing and it is the most abundant PFAS found in the environment. TFA does not have well-established health advisories or regulatory limits as other PFAAs. Trifluoroacetic acid is also formed by the degradation of pesticides that contain a trifluoromethyl group (-CF3), such as flufenacet. Pesticides have been identified as the main source of TFA in water in agricultural areas. In Germany, the annual TFA emissions originating from fluorinated plant protection products are estimated at 400 to 500 t. Trifluoroacetic acid degrades very slowly in the environment and has been found in increasing amounts as a contaminant in water, soil, food, and the human body. Median concentrations of a few micrograms per liter have been found in beer and tea. Seawater can contain about 200 ng of TFA per liter. Biotransformation by decarboxylation to fluoroform has been discussed. In October 2024, a publication proposed classifying TFA as a planetary boundary threat, similar to how CFCs are treated. It is estimated that the TFA emissions resulting from the atmospheric degradation of volatile TFA-precursors, such as HCFCs, HFCs, HFOs, and HCFOs, released in Europe (EU-28) will rise exponentially from approx. 9 kt (2015) to approx. 40 kt (2030).
Bats possess a highly adapted respiratory system to cope with the demands of powered flight. They have relatively large lungs, and many species have proportionally larger alveolar surface areas and pulmonary capillary blood volumes than other mammals. During flight, the respiratory cycle has a one-to-one relationship with the wing-beat cycle. Their mammalian lungs prevent them from flying at high altitudes. Bats can also meet oxygen demands by exchanging gas through the patagium of the wing. When the bat has its wings spread, it allows for an increase in surface area to volume ratio, 85% of the surface area being the wing. The subcutaneous vessels in the membrane lie near the surface and allow for the diffusion of oxygen and carbon dioxide. The digestive system of bats varies depending on the species of bat and its diet. Digestion is relatively quick to meet the energy demands of flight. Insectivorous bats may have certain digestive enzymes to better process insects, such as chitinase to break down their chitin exoskeleton. Vampire bats, probably due to their diet of blood, are unique among vertebrates in that they do not have the enzyme maltase, which breaks down malt sugar, in their intestinal tract. Nectivorous and frugivorous bats have more maltase and sucrase enzymes than insectivores, to cope with the higher sugar contents of their diet. The adaptations of the kidneys of bats vary with their diets. Carnivorous and vampire bats consume large amounts of protein and can output concentrated urine; their kidneys have a thin cortex and long renal papillae.
Sources: en.wikipedia.org
== Further reading == Hồ NT, Hughes SG, Ta VT, Phan LT, Đỗ Q, Nguyễn TV, et al. (May 2024). "Safety, immunogenicity and efficacy of the self-amplifying mRNA ARCT-154 COVID-19 vaccine: pooled phase 1, 2, 3a and 3b randomized, controlled trials". Nature Communications. 15 (1) 4081. Bibcode:2024NatCo..15.4081H. doi:10.1038/s41467-024-47905-1. PMC 11094049. PMID 38744844.
==== Agriculture and land ==== Liu Wenhui's agricultural policy put much emphasis on wage laborers working under state-owned enterprises, a marked departure from Zhao Erfeng's more explicitly colonialist model of settlers working on state-owned land. In 1939, the Agriculture Improvement Institute was formed and embarked on a variety of projects across Xikang, including fertilizer plants, ranches, farms, plantations, and sericulture. In addition, the Institute installed weather monitoring stations across the province. Due to a lack of resources, none of these projects were particularly successful, save for perhaps the farm at Taining which was 2.5 million mu in area and remained in existence as of 2021. Although Liu maintained the Zhao-era policy that all wasteland or non-cultivated areas (huang) were state-owned, in practice state farms ended up renting even huang areas from landowners. This was because in the early Republican era, the government began selling deeds to the land in Xikang and charging taxes on the sale of deeds, deriving much profit from it. This state of affairs was not addressed by the Liu administration, perhaps due to the fact that much of the Qing-era uncultivated land was already being utilized. By 1940, income from the deed tax was equivalent to around one-third of that of the land tax.
The Scar Free Foundation is a medical research charity focused on scar free healing. It was founded in 1998 by plastic surgeon Michael Brough, following his work with survivors of the King's Cross Fire in London. Initially known as The Healing Foundation, it was relaunched as The Scar Free Foundation in 2016. The charity funds medical research into wound healing and scarring conditions. Current research is focused on identifying the pathways that lead to scarring, developing new treatment options, and improving the psychological outcomes and quality of life of patients currently living with scars. The current Chairman is former Medical Director of the NHS, Sir Bruce Keogh, and the Chief Executive is Richard Nugee CB CVO CBE. Peter Weissberg CBE is the Research Council Chairman. Sophie, Duchess of Edinburgh is the charity's Royal Patron. Notable Ambassadors include Simon Weston CBE and Pam Warren.
A boom or a chain (also boom defence, harbour chain, river chain, chain boom, boom chain or variants) is an obstacle strung across a navigable stretch of water to control or block navigation. They are sometimes mixed with pile barrages. In modern times they usually have civil uses, such as to prevent access to a dangerous river channel. But, especially historically, they have been used militarily, with the goal of denying access to an enemy's ships: a modern example is the anti-submarine net. Booms have also been used to force passing vessels to pay a toll.
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.
It is a synthetic compound studied as an agonist of REV-ERB nuclear receptors. It is not an approved medicine and has mainly been examined in laboratory and animal research.