metabolic modulator raises a handful of sensible questions. This page answers them in order, starting with the fundamentals and moving to applications.
Reviewed 2026-07-13. Anything still debated is marked as such rather than presented as settled.
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.
Identity and purity testing for SR9009 commonly uses liquid chromatography coupled with tandem mass spectrometry. This method separates the compound from matrix components and detects it by mass-to-charge transitions, providing sensitive and specific confirmation. Nuclear magnetic resonance spectroscopy can support structural identification, while high-performance liquid chromatography with ultraviolet detection may estimate purity. Because online products labeled as SR9009 may contain other substances or no active compound at all, independent verification is important in research settings. Certificates of analysis are useful but not a substitute for in-house testing.
Laboratory samples of SR9009 are typically supplied as a white to off-white powder. The compound dissolves readily in organic solvents such as dimethyl sulfoxide and ethanol, while its solubility in water is low. Because of this solubility profile, researchers often prepare concentrated stock solutions in an organic solvent before diluting them into aqueous assay buffers. Light exposure, moisture, and repeated freeze-thaw cycles can degrade many small molecules, so handling procedures usually aim to minimize these factors. Purity is commonly checked before use.
Storage conditions for research-grade SR9009 generally involve a freezer at approximately minus twenty degrees Celsius, sometimes lower for long-term preservation. Containers should remain tightly closed and protected from light. Desiccants may be used to limit moisture uptake. Solutions are often stored in aliquots to avoid repeated warming and cooling. Stability data for the compound under various conditions are limited, so laboratories typically follow supplier recommendations and verify performance through periodic analytical checks rather than assuming indefinite stability.
| 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 |
Storage recommendations for SR9009 reference material typically specify a freezer at -20 °C or lower, with protection from moisture and light. Repeated freeze-thaw cycles can degrade small molecules and introduce variability. Stock solutions in dimethyl sulfoxide are often aliquoted to avoid repeated handling. Stability studies may examine degradation under heat, humidity, and light exposure. The compound's thiophene and nitro groups can participate in reactions that alter analytical signals over time, so such changes affect quantitative results.
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.
SR9009 is a synthetic small molecule developed as a REV-ERB agonist. It binds to REV-ERBα and REV-ERBβ, nuclear receptors that help regulate circadian rhythms and metabolic gene expression. In cell and animal studies, the compound alters lipid and glucose handling and influences skeletal muscle oxidative capacity. Its exact effects in humans remain largely uncharacterized because controlled clinical trials have not been reported. The molecule is frequently described in preclinical literature as a metabolic modulator.
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 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.
==== Cold electron ionization ==== The "hard ionization" process of electron ionization can be softened by the cooling of the molecules before their ionization, resulting in mass spectra that are richer in information. In this method named cold electron ionization (cold-EI) the molecules exit the GC column, mixed with added helium make up gas and expand into vacuum through a specially designed supersonic nozzle, forming a supersonic molecular beam (SMB). Collisions with the make up gas at the expanding supersonic jet reduce the internal vibrational (and rotational) energy of the analyte molecules, hence reducing the degree of fragmentation caused by the electrons during the ionization process. Cold-EI mass spectra are characterized by an abundant molecular ion while the usual fragmentation pattern is retained, thus making cold-EI mass spectra compatible with library search identification techniques. The enhanced molecular ions increase the identification probabilities of both known and unknown compounds, amplify isomer mass spectral effects and enable the use of isotope abundance analysis for the elucidation of elemental formulas.
== Causes == Migraines are believed to result from a mix of genetic, environmental, and neurological factors. Migraine runs in families, with heritability estimates of 34–64%, but this rarely reflects a single gene defect. Rather, a variety of genetic factors that mostly relate to the nervous system and blood vessels may raise migraine risk. Migraine often occurs along with conditions such as depression, anxiety, and bipolar disorder, which may have a bidirectional relationship (either one can worsen the other). Shared genetic and neurobiological mechanisms likely contribute to risk factors underlying multiple conditions.
*Online Mendelian Inheritance in Man (OMIM). The Alpha-1 refers the alpha-1 subunit of the spectrin protein. The Beta refers the beta subunit of the spectrin protein. These genetic mutations are acted upon and executed by erythrocyte progenitor cells within the bone marrow, where red blood cells are normally produced in the non-pathological state (see Extramedullary hematopoiesis for pathological production outside of the bone marrow).
Peptide nucleic acids (PNAs) are synthetic oligonucleotides in which the sugar-phosphate backbone of the DNA or RNA is replaced by a neutral N-(2-aminoethyl)-glycine peptide-like backbone. This allows PNAs to hybridize with complementary DNA or RNA with high affinity and specificity, maintaining their ability to be amplified via polymerase chain reaction (PCR). Unlike DNA/RNA, PNAs are able to resist degradation by nucleases and proteases. In a PNA-encoded library system, unique PNA sequences serve as molecular tags that are covalently attached to small molecules that are produced using combinatorial methods that generate large collections of related compounds. These PNA tags act as barcodes that encode the identity of the PNA allowing for downstream identification. PNA libraries are synthesized using solid-phase peptide synthesis (SPPS), allowing library assembly on resin similar to other peptide libraries. This contrasts with DNA-encoded libraries, which often require enzymatic ligation steps and can be limited by the chemical properties of DNA. The neutrality and stability of the PNA backbone means that PNA tags can tolerate conditions that might degrade DNA tags, and the strong hybridization to complementary nucleic acids which allows PNA tags to be decoded wither by direct hybridization or by conversion into DNA, which can then be amplified and analyzed ,<ref. PNA-encoded libraries have been used in several different formats, including microarray hybridization, selection against biological targets, and PCR-based decoding following selection.
==== Co-evolutionary evidence ==== An independent molecular analysis trying to establish the dates when bat ectoparasites (bedbugs) evolved came to the conclusion that bedbugs similar to those known today (all major extant lineages, all of which feed primarily on bats) had already diversified and become established over 100 million years ago, suggesting that they initially all evolved on non-bat hosts and "bats were colonized several times independently, unless the evolutionary origin of bats has been grossly underestimated". No analysis has provided estimates for the age of the flea lineages associated with bats. The oldest known members of a different lineage of bat ectoparasites (bat flies), however, are from roughly 20 million years ago, well after the origin of bats. The bat-ectoparasitic earwig family Arixeniidae has no fossil record but is not believed to originate more than 23 million years ago.
Sources: en.wikipedia.org
The vaginal opening (also known as the vaginal introitus and the Latin ostium vaginae) is at the posterior end of the vulval vestibule, behind the urethral opening. The term introitus is more technically correct than "opening", since the vagina is usually collapsed, with the opening closed. The opening to the vagina is normally obscured by the labia minora (inner lips), but may be exposed after vaginal delivery. The hymen is a thin layer of mucosal tissue that surrounds or partially covers the vaginal opening. The effects of intercourse and childbirth on the hymen vary. Where it is broken, it may completely disappear or remnants known as carunculae myrtiformes may persist. Otherwise, being very elastic, it may return to its normal position. Additionally, the hymen may be lacerated by disease, injury, medical examination, masturbation or physical exercise. For these reasons, virginity cannot be definitively determined by examining the hymen.
== Isotopes == Twelve radioisotopes of nobelium have been characterized, with the most stable being 259No with a half-life of 58 minutes. Longer half-lives are expected for the as-yet-unknown 261No and 263No. An isomeric level has been found in 253No and K-isomers have been found in 250No, 252No and 254No to date.
=== Aquaculture === There has been promising research in using E. sinensis as a partial food substitution in fish farming facilities. By replacing a certain percentage of fish meal based feed with E. sinensis in farmed largemouth bass larger fish with higher quality meat was produced.
In 1942, the Nationalists conducted a major fiscal reorganization by abolishing provincial budgets and centralizing financial control, a move that ironically led to many local administrations relying even less on the central government because they had lost funding. These local administrations were forced to turn to other measures to support themselves. Liu Wenhui, who had already been involved in the opium trade prior to 1942, now faced the loss of his stipend from both the central government and the Sichuanese provincial government. Liu's budgetary situation had already been precarious: in 1939, Xikang's expenditures were around 5.4 million yuan, but non-opium income only amounted to 1.4 million yuan. Liu began growing opium on a systematic scale around the early 1940s. He instituted taxes on opium, taxes for not growing opium (the "laziness tax"), taxes on the import, export, and sale of opium, and "red light" taxes on opium dens. After 1942, each county in Xikang was assigned an annual tax quota of at least 100 dan (160,000 liang), with total revenues estimated at at least 3-4,000 dan. The price per liang of opium was one to two silver dollars in Xikang and three to four dollars in the Sichuan basin, not counting shortages. During the communist era, when opium consumption was strictly prohibited, Liu admitted that his strategy was one of "drinking poison to quench thirst." However, he blamed Chiang Kai-shek for forcing him into a situation where he had no other choice but to cultivate, trade, and tax opium.
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.
Research-grade SR9009 is typically stored frozen at about minus twenty degrees Celsius, protected from light and moisture. Stock solutions are often kept in aliquots to avoid repeated freeze-thaw cycles. Specific storage conditions should follow the supplier's documentation.