A practical reference on reference standard: what it is, how it behaves, what the literature reports, and where the honest uncertainties sit.
This page was last updated on 2025-11-09 and is reviewed periodically as new material appears.
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.
Several misconceptions surround SR9009. It is often described as a SARM, a steroid, or an exercise pill, but its known target is the REV-ERB receptor family. Rodent studies have examined exercise capacity and metabolic markers, yet human outcomes remain unproven. Oral bioavailability appears low in animals, and human pharmacokinetics are not well characterized. Online products may contain impurities or different compounds, so identity and purity testing are important for research use.
Analytical chemists detect SR9009 with liquid chromatography-tandem mass spectrometry, commonly abbreviated LC-MS/MS. Sample preparation may involve protein precipitation, liquid-liquid extraction, or solid-phase extraction before analysis. Laboratories can target the parent compound or its metabolites, depending on the matrix and the purpose of testing. Anti-doping methods require sensitive and specific assays because concentrations in biological samples can be low. Reference standards and validated methods are essential for reliable identification and quantification.
| 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 |
At the molecular level, SR9009 binds the ligand-binding domain of REV-ERB and strengthens recruitment of corepressor proteins such as NCoR and HDAC3. This increases repression of target genes, including Bmal1 and other clock-controlled and metabolic genes. In rodent studies, such changes have been linked to altered lipid handling, glucose metabolism, and energy expenditure. The precise chain of events between receptor binding and whole-body effects remains an active area of research. Findings in animals do not automatically translate to humans.
Laboratory studies often administer SR9009 by injection because oral absorption appears poor in rodents. Reported pharmacokinetic properties include rapid metabolism and low systemic exposure after oral dosing. Human pharmacokinetic data are sparse, so absorption, distribution, metabolism, and excretion in people are not well defined. Some research explores related REV-ERB compounds with improved drug-like properties. Regulatory approval for any REV-ERB agonist as a human medicine has not been granted to date.
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.
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.
The overall fold of the KaiA monomer is that of a four-helix bundle, which forms a dimer in the known structure. KaiA functions as a homodimer. Each monomer is composed of three functional domains: the N-terminal amplitude-amplifier domain, the central period-adjuster domain and the C-terminal clock-oscillator domain. The N-terminal domain of KaiA, from cyanobacteria, acts as a pseudo-receiver domain, but lacks the conserved aspartyl residue required for phosphotransfer in response regulators. The C-terminal domain is responsible for dimer formation, binding to KaiC, enhancing KaiC phosphorylation and generating the circadian oscillations. The KaiA protein from Anabaena sp. (strain PCC 7120) lacks the N-terminal CheY-like domain. KaiB adopts an alpha-beta meander motif and is found to be a dimer or a tetramer. KaiC belongs to a larger family of proteins; it performs autophosphorylation and acts as its own transcriptional repressor. It binds ATP.
== Tantalum-180m == The nuclide 180mTa (m denotes a metastable state) is one of a very few nuclear isomers which are more stable than their ground states. Although it is not unique in this regard (this property is shared by bismuth-210m (210mBi) and americium-242m (242mAm), among other nuclides), it is exceptional in that it is observationally stable: no decay has ever been observed. In contrast, the ground state nuclide 180Ta has a half-life of only 8 hours. 180mTa has sufficient energy to decay in three ways: isomeric transition to the ground state of 180Ta, beta decay to 180W, or electron capture to 180Hf. However, no radioactivity from any of these theoretically possible decay modes has ever been observed. As of 2023, the half-life of 180mTa is calculated from experimental observation to be at least 2.9×1017 (290 quadrillion) years. The very slow decay of 180mTa is attributed to its high spin (9 units) and the low spin of lower-lying states. Gamma or beta decay would require many units of angular momentum to be removed in a single step, so that the process would be very slow. Similar suppression of gamma or beta decay occurs for 210mBi, a long-lived alpha emitter. Because of this stability, 180mTa is a primordial nuclide, the only naturally occurring nuclear isomer (excluding short-lived radiogenic and cosmogenic nuclides). It presents one of two apparent violations of the Mattauch isobar rule, the other involving tellurium-123. It is also the rarest primordial nuclide in the Universe observed for any element which has any stable isotopes.
Extraction of lithium, nickel, and cobalt, manufacture of solvents, and mining byproducts present significant environmental and health hazards. Lithium extraction can be fatal to aquatic life due to water pollution. It is known to cause surface water contamination, drinking water contamination, respiratory problems, ecosystem degradation and landscape damage. It also leads to unsustainable water consumption in arid regions (1.9 million liters per ton of lithium). Massive byproduct generation of lithium extraction also presents unsolved problems, such as large amounts of magnesium and lime waste. Lithium mining takes place in North and South America, Asia, South Africa, Australia, and China. Cobalt for Li-ion batteries is largely mined in the Congo (see also Mining industry of the Democratic Republic of the Congo). Open-pit cobalt mining has led to deforestation and habitat destruction in the Democratic Republic of Congo. Open-pit nickel mining has led to environmental degradation and pollution in developing countries such as the Philippines and Indonesia. In 2024, nickel mining and processing was one of the main causes of deforestation in Indonesia. Manufacturing a kg of Li-ion battery takes about 67 megajoules (MJ) of energy. The global warming potential of lithium-ion batteries manufacturing strongly depends on the energy source used in mining and manufacturing operations, and is difficult to estimate, but one 2019 study estimated 73 kg CO2e/kWh. Effective recycling can reduce the carbon footprint of the production significantly.
==== Near-line ==== Nearline storage is typically less accessible and less expensive than online storage, but still useful for backup data storage. A mechanical device is usually used to move media units from storage into a drive where the data can be read or written. Generally it has safety properties similar to on-line storage. An example is a tape library with restore times ranging from seconds to a few minutes.
The empirical formula for benzene was long known, but its highly polyunsaturated structure, with just one hydrogen atom for each carbon atom, was challenging to determine. Archibald Scott Couper in 1858 and Johann Josef Loschmidt in 1861 suggested possible structures that contained multiple double bonds or multiple rings, but in these years very little was known about aromatic chemistry, and so chemists were unable to adduce appropriate evidence to favor any particular formula. But many chemists had begun to work on aromatic substances, especially in Germany, and relevant data was coming fast. In 1865, the German chemist Friedrich August Kekulé published a paper in French (for he was then teaching in Francophone Belgium) suggesting that the structure contained a ring of six carbon atoms with alternating single and double bonds. The next year he published a much longer paper in German on the same subject. Kekulé used evidence that had accumulated in the intervening years—namely, that there always appeared to be only one isomer of any monoderivative of benzene, and that there always appeared to be exactly three isomers of every disubstituted derivative—now understood to correspond to the ortho, meta, and para patterns of arene substitution—to argue in support of his proposed structure. Kekulé's symmetrical ring could explain these curious facts, as well as benzene's 1:1 carbon-hydrogen ratio.
Sources: en.wikipedia.org
=== Prize money === In April 2026, FIFA confirmed the prizes for all participating nations. The total distribution of prize money for the expanded tournament was $871 million, nearly double the amount from the 2022 World Cup. Of this total, $671 million was allocated for performance-based prizes, with the remaining $200 million paid out among teams regardless of performance. Each qualified team received preparation money in the amount of $2.5 million; a team that was eliminated in the group stage would receive a minimum total amount $12.5 million at the tournament, with the winner receiving a total of $52.5 million.
Beefy meaty peptide, also known as delicious peptide and abbreviated as BMP, is an 8-amino acid long peptide that has been identified as giving a beefy flavour to foods in which it is present. It was isolated from beef soup by Yamasaki and Maekawa in 1978. Ongoing research since its discovery by Yamasaki and Maekawa has provided general support for the presence of its flavor-imparting properties. However, due to its high production cost, the peptide's potential for widespread application in the food industry has yet to be realized, prompting current research efforts to focus on finding a method of mass-production for the peptide.
=== Historical misuse === Opiate misuse has been recorded at least since 300 BC. Greek mythology describes Nepenthe ("free from sorrow") and its use by the hero of the Odyssey. Opioids have been used in the Near East for centuries. They were purified and isolated in the early 19th century. In the early 2000s, buprenorphine was one of the first opioid dependence drugs approved in the U.S. to combat opioid abuse, after decades of research led to the development of drugs to fight opioid use disorder.
== External links == Ethoxymethyl salvinorin B - Isomer Design Salvinorin B Ethoxymethyl Ether Reports - Erowid Experience Vaults - Erowid The Three Day Salvia Trip...? - Alien Insect on Drugs (Andrew Gallimore) - Substack
Sources: en.wikipedia.org
N-Acetyl-γ-aminobutyric acid (N-acetyl-GABA), also known as N-acetyl-4-aminobutyric acid, is a metabolic intermediate in the biosynthesis of γ-aminobutyric acid (GABA) from putrescine. Other intermediates in this pathway include N-acetylputrescine and N-acetyl-γ-aminobutyraldehyde (N-acetyl-GABAL or N-acetyl-GABA aldehyde). Enzymes mediating the transformations in this pathway include putrescine acetyltransferase (PAT), monoamine oxidase B (MAO-B), aldehyde dehydrogenase (ALDH), and an unknown deacetylase enzyme. The pathway is a minor pathway in GABA synthesis compared to the main pathway in which GABA is synthesized from glutamate. However, the pathway has been found to have an important physiological role in the brain, for instance in the production of GABA in the striatum and resultant inhibition of dopaminergic neurons in this brain area.
There are four common forms in which AAS are administered: oral pills; injectable steroids; creams/gels for topical application; and skin patches. Oral administration is the most convenient. Testosterone administered by mouth is rapidly absorbed, but it is largely converted to inactive metabolites, and only about one-sixth is available in active form. In order to be sufficiently active when given by mouth, testosterone derivatives are alkylated at the 17α position, e.g. methyltestosterone and fluoxymesterone. This modification reduces the liver's ability to break down these compounds before they reach the systemic circulation. Testosterone can be administered parenterally, but it has more irregular prolonged absorption time and greater activity in muscle in enanthate, undecanoate, or cypionate ester form. These derivatives are hydrolyzed to release free testosterone at the site of injection; absorption rate (and thus injection schedule) varies among different esters, but medical injections are normally done anywhere between semi-weekly to once every 12 weeks. A more frequent schedule may be desirable in order to maintain a more constant level of hormone in the system. Injectable steroids are typically administered into the muscle, not into the vein, to avoid sudden changes in the level of the drug in the bloodstream. In addition, because estered testosterone is dissolved in oil, intravenous injection has the potential to cause a dangerous embolism (clot) in the bloodstream.
=== Oregon State University controversy === In 2011, Robinson alleged that Oregon State University (OSU) was part of a conspiracy to retaliate against him for his political activism by expelling his three children, all of whom were graduate students there. When asked what proof he has of the university discriminating against his children, Robinson stated, "I don't have definitive proof, [...] That is what I believe. Basically, I know what happened. I cannot tell you the motives of the people doing it." In a statement, OSU would not comment on matters concerning the students without their consent, but declared all the other claims, including those about the faculty, to be unfounded.
== Function == The role of prolidase in human physiology is collagen breakdown. Collagen, the most prevalent protein in the human body, is necessary for maintaining strong connective tissues, cellular proliferation, and wound healing, among other functions. As collagen is degraded, dipeptides are released as a byproduct. Serum prolidase absorbs and digests these byproducts so they can be reused in collagen production. Proline is required for collagen production, further indicating the necessity of serum prolidase, as proline is a product of the prolidase reaction. Wound healing is a paramount function in maintaining good health of the human body. Collagen uses its rigid properties to structurally support wounds and speed up the healing process. As the wound heals, type III collagen is produced by fibroblasts, which is later replaced by type II collagen, then type I collagen. These changes indicate different stages of the wound-healing process. Due to proline's cyclic structure, only few peptidases could cleave the bond between proline and other amino acids. Along with prolinase, prolidase are the only known enzymes that can break down dipeptides to yield free proline. Prolidase serve to hydrolyze both dietary and endogenous Xaa-Pro dipeptides. More specifically, it is essential in catalyzing the last step of the degradation of procollagen, collagen, and other proline-containing peptides into free amino acids to be used for cellular growth. Additionally, it also participates in the process of recycling proline from Xaa-Pro dipeptides for collagen resynthesis.
== Characteristics == Kava was historically grown only in the Pacific islands of Hawaii, Federated States of Micronesia, Vanuatu, Fiji, the Samoas, and Tonga. It appears to have originated in Vanuatu; an inventory of P. methysticum distribution showed it was cultivated on numerous islands of Micronesia, Melanesia, Polynesia, and Hawaii, whereas specimens of P. wichmannii were all from Papua New Guinea, the Solomon Islands, and Vanuatu. Traditionally, plants are harvested around four years of age, as older plants have higher concentrations of kavalactones. After reaching about 2 metres (6.6 ft) in height, plants grow a wider stalk and additional stalks, but not much taller. The roots can reach a depth of 60 centimetres (2.0 ft).
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.
Legality depends on the country and the intended use. In many places it is not approved as a medicine and may be sold only as a research chemical. Importation or possession can be restricted, and sports organizations prohibit it.