If you have been reading about LC-MS/MS 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.
Updated 2026-02-11. Numbers and descriptions here follow the published literature rather than marketing material.
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.
Regulatory treatment of SR9009 varies by country and context. It is not approved as a therapeutic drug by agencies such as the United States Food and Drug Administration or the European Medicines Agency. Sports authorities list it as a prohibited substance; the World Anti-Doping Agency classifies it among hormone and metabolic modulators. Legal status for personal possession or sale differs across jurisdictions, and some countries may restrict it under analog or research chemical laws. Buyers who seek verified material often rely on independent laboratory testing because online product labels may not match contents.
Laboratory samples of SR9009 are typically handled as research chemicals rather than pharmaceuticals. Suppliers usually state that the material is for research use only and not for human or veterinary administration. Storage recommendations generally call for a freezer at approximately −20 °C, protection from light, and a desiccated environment. The solid is often described as a white to off-white powder. Solubility is commonly reported in organic solvents such as dimethyl sulfoxide and ethanol, with low solubility in water.
| 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 |
Regulatory agencies have not approved SR9009 for human therapeutic use. It is typically sold as a research chemical with labels stating that it is not for human consumption. The World Anti-Doping Agency prohibits the substance in sport, generally under the category of non-approved substances. Customs and national laws may restrict importation, sale, or possession. Product quality and legal status can vary by country and vendor, and therapeutic claims are not permitted in regulated advertising because the compound lacks approval.
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.
SR9009 is supplied as a solid research chemical, often in milligram quantities. Laboratories typically weigh it in a controlled environment because fine powders can disperse. Stock solutions are commonly prepared in dimethyl sulfoxide and stored in small aliquots to reduce freeze-thaw cycles. Personal protective equipment and chemical fume hoods are standard when handling unknown or potent compounds. These practices address laboratory safety rather than human use.
Identity and purity of SR9009 samples are usually checked with chromatographic and spectrometric methods. High-performance liquid chromatography can separate the compound from related impurities, while mass spectrometry provides molecular mass confirmation. Nuclear magnetic resonance spectroscopy may be used for structural verification in research settings. No single method proves biological activity, and certificates of analysis should be reviewed alongside raw data. Independent testing is often needed because online products vary widely.
SR9009 is a synthetic small molecule studied as an agonist of the nuclear receptors REV-ERBα and REV-ERBβ, also called NR1D1 and NR1D2. These receptors help regulate circadian rhythms and metabolic gene programs. The compound was developed for laboratory research, not as an approved therapeutic. Its identity is distinct from steroid hormones and selective androgen receptor modulators. Scientific interest centers on how REV-ERB activation changes gene expression in cells and animal models.
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.
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.
== Classification == Neuromuscular blocking agents are classified into the following two groups: Depolarizing neuromuscular blockers: Depolarizing neuromuscular blockers directly bind to postsynaptic cholinergic receptors of the neuromuscular junction to generate a sustained action potential. This causes prolonged stimulation and desensitization of neuroreceptors, causing skeletal muscle relaxation effects such as paralysis. Depolarizing neuromuscular blockers, notably succinylcholine, tend to be preferred over non-depolarizing neuromuscular blockers due to their long-acting and rapid-onset properties. Non-depolarizing neuromuscular blockers: Non-depolarizing neuromuscular blockers directly bind to acetylcholine receptors on the postsynaptic neuron and does not cause depolarization of the neuromuscular junction. They act as competitive inhibitors to acetylcholine, blocking their binding to acetylcholine receptors on the postsynaptic membrane to inhibit membrane depolarization. Inhibition of neurotransmitter binding in the neuromuscular junction induces paralyzing effects. Compared to depolarizing neuromuscular blockers, non-depolarizing neuromuscular blockers tend to have slower onset times and shorter duration of actions. Aside from neuromuscular blocking agents, acetylcholinesterase inhibitors and butyrylcholinesterase inhibitors act on the neuromuscular junction to enhance neurotransmitter transmission in voluntary and involuntary muscles. Additionally, some antibiotics, such as aminoglycosides, may also exert undesired side effects on the neuromuscular junction.
President-elect Joe Biden announces he will elevate the White House Office of Science and Technology Policy to a Cabinet-level position, making its nominated director Eric Lander the first biologist in the Cabinet, if confirmed by the U.S. Senate. January 17 – Riley June Williams, a 22-year-old woman suspected of stealing House Speaker Nancy Pelosi's laptop during the January 6 Capitol riot, is charged by the FBI with intent to sell the device to Russian foreign intelligence services. January 18 Vice President-elect Kamala Harris resigns from her U.S. Senate seat. Her chosen successor, former California Secretary of State Alex Padilla, becomes the first Latino to represent California in the Senate. The 1776 Report is released by the 1776 Commission. January 19 COVID-19 pandemic: Nationwide COVID-19 deaths surpass 400,000. On his final full day in office, President Trump issues pardons for 144 people. New York State Office of Court Administration employee Brendan Hunt is arrested by the FBI for encouraging public executions of members of the U.S. Congress on social media. January 20 Joe Biden is sworn in as the 46th president of the United States. Kamala Harris becomes the first woman, first Asian American, and first African American to become Vice President of the United States. Donald Trump becomes the first outgoing president to boycott his successor's inauguration since Andrew Johnson in 1869.
She donated the entirety of the prize money towards the creation of scholarships to assist women, underrepresented minorities and refugees who are pursuing the study of physics. 2018: Canadian physicist Donna Strickland received the Nobel Prize in Physics "for groundbreaking inventions in the field of laser physics"; she shared it with Arthur Ashkin and Gérard Mourou. 2018: New Zealand chemist Juliet Gerrard was appointed as the Prime Minister's Chief Science Advisor in the administration of Jacinda Ardern, the first time a woman was appointed to the role. 2018: American chemist Frances Arnold received the Nobel Prize in Chemistry "for the directed evolution of enzymes"; she shared it with George Smith and Gregory Winter, who received it "for the phage display of peptides and antibodies". This made Frances the first American woman to receive the Nobel Prize in Chemistry. 2018: For the first time in history, women received the Nobel Prize in Chemistry and the Nobel Prize in Physics in the same year. 2019: NASA astronauts Christina Koch and Jessica Meir complete the first ever all-female spacewalk outside the International Space Station (ISS) replacing a failed power control unit. 2019: American Mathematician Karen Uhlenbeck became the first woman to win the Abel Prize for "her pioneering achievements in geometric partial differential equations, gauge theory, and integrable systems, and for the fundamental impact of her work on analysis, geometry and mathematical physics".
== Epidemiology == The late onset of Huntington's disease means it does not usually affect reproduction. The worldwide prevalence of HD is 5–10 cases per 100,000 persons, but varies greatly geographically as a result of ethnicity, local migration and past immigration patterns. Prevalence is similar for men and women. The rate of occurrence is highest in peoples of Western European descent, averaging around seven per 100,000 people, and is lower in the rest of the world; e.g., one per million people of Asian and African descent. A 2013 epidemiological study of the prevalence of HD in the UK between 1990 and 2010 found that the average prevalence for the UK was 12.3 per 100,000. Additionally, some localized areas have a much higher prevalence than their regional average. One of the highest incidences is in the isolated populations of the Lake Maracaibo region of Venezuela, where HD affects up to 700 per 100,000 persons. Other areas of high localization have been found in Tasmania and specific regions of Scotland, Wales and Sweden. Increased prevalence in some cases occurs due to a local founder effect, a historical migration of carriers into an area of geographic isolation. Some of these carriers have been traced back hundreds of years using genealogical studies. Genetic haplotypes can also give clues for the geographic variations of prevalence.
=== Fibrin glue sealant === If blood patches alone do not succeed in closing the dural tears, placement of percutaneous fibrin glue can be used in place of blood patching, raising the effectiveness of forming a clot and arresting CSF leakage.
Sources: en.wikipedia.org
===== Activated carbon ===== Activated carbons (ACs) or biological-activated carbon (BAC) are effective adsorbents for a wide variety of contaminants. The adsorptive removal of color, aroma, taste, and other harmful organics and inorganics from drinking water and wastewater is one of their industrial applications. Both a high surface area and a large pore size can improve the efficiency of activated carbon. Activated carbon was utilized by a number of studies to remove heavy metals and other types of contaminants from wastewater. The cost of activated carbon is rising due to a shortage of commercial activated carbon (AC). Because of its high surface area, porosity, and flexibility, activated carbon has a lot of potential in wastewater treatment.
Fatoumata Binta Diallo - First woman who registered to practice law in the Bar of the Republic of Guinea Conakry. Bachir Diallo - Minister of Security and Civil Protection, Guinea. Facinet Sylla - Minister of Budget, former executive director Of International Monetary Fund. Katoucha (Kadiatou Niane) – former model and fashion designer, Guinea Boubacar Yacine Diallo – Journalist, Writer, former Minister of Communication, former chairman of the National Council of Communication, Current vice president of the independent national institution for human rights in Guinea. Addi Bâ or Bah Mamadou Hady – called by the Germans "black terrorist" ("Der schwarze Terrorist"), a figure of the French resistance, member of the first scrub of the Vosges, Guinea Aïcha Bah Diallo – former Minister of Education and Women's Rights Activist, former Senior education leader at UNESCO. Hamidou Diallo – American professional basketball player. 2019 NBA All-Star Slam Dunk Contest winner Abou Sangaré - Mechanic and Actor, Best European Actor 2024 Rabiatou Sérah Diallo – Guinean trade unionist. former president of the National Transitional Council. Current president of Economic and Social Council, Guinea Black M (Alpha Diallo) – French rapper and Singer–Songwriter.
Moreover, for pathogen sequencing the use of controls is of fundamental importance ensuring mNGS assay quality and stability over time; PhiX is used as sequencing control, then the other controls include the positive control, an additional internal control (e.g., spiked DNA or other known pathogen) and a negative control (usually water sample). Bioinformatic analysis: Whereas the sequencing itself has been made widely accessible and more user friendly, the data analysis and interpretation that follows still requires specialized bioinformatics expertise and appropriate computational resources. The raw data from a sequencing platform is usually cleaned, trimmed, and filtered to remove low-quality and duplicate reads. Removal of the host genome/transcriptome reads is performed to decrease background noise (e.g., host and environmental reads) and increase the frequency of pathogen reads. This step will also decrease downstream analysis time. Further background noise removal is achieved by mapping of sample reads to the reads from the negative control to ensure elimination of any contaminating reads, such as those associated with the reagents or sampling storage medium. The remaining reads are usually assembled de novo to produce long stretches of sequences called contigs. Taxonomic identification of the resulting contigs is performed by matching them to the genomes and sequences in nucleotide or protein databases; for this, various versions of BLAST are most commonly used.
It is highly efficient. As the figure demonstrates, the number of peptides formed in the synthetic process (3, 9, 27, 81) increases exponentially with the number of executed cycles. Using 20 amino acids in each synthetic cycle, the number of formed peptides are 400, 8,000, 160,000 and 3,200,000, respectively. This means that the number of peptides increases exponentially with the number of the executed cycles. All peptide sequences that are formed in the process can be deduced by a combination of the amino acids used in the cycles. Portioning of the support into equal samples assures formation of the components of the library in nearly equal molar quantities. Only a single peptide forms on each bead of the support. This is the consequence of using only one amino acid in the coupling steps. It is completely unknown, however, which is the peptide that occupies a selected bead. The split-mix method can be used for the synthesis of organic or any other kind of library that can be prepared from its building blocks in a stepwise process. In 1990, three groups described methods for preparing peptide libraries by biological methods and one year later Fodor et al. published a remarkable method for synthesis of peptide arrays on small glass slides. A "parallel synthesis" method was developed by Mario Geysen and his colleagues for preparation of peptide arrays. They synthesized 96 peptides on plastic rods (pins) coated at their ends with the solid support. The pins were immersed into the solution of reagents placed in the wells of a microtiter plate.
Sources: en.wikipedia.org
=== Maturation phase === During the maturation phase of wound healing, unnecessary vessels formed in granulation tissue are removed by apoptosis, and type III collagen is largely replaced by type I. Collagen which was originally disorganized is cross-linked and aligned along tension lines. This phase can last a year or longer. Ultimately a scar made of collagen, containing a small number of fibroblasts is left.
=== Isomers === Other hydroxyprolines also exist in nature. The most notable one is trans-L-3-hydroxyproline (or (2S,3S)-3-hydroxyproline), produced in humans and other animals by prolyl 3-hydroxylase (EC 1.14.11.7). Although present in much lower amounts than trans-L-4-hydroxyproline, 3-hydroxyproline is indispensable for the functioning of type IV collagen in mice. Without it the embryo does not survive to birth. Intestinal bacteria produce 4-hydroxyproline epimerase, which performs a bidirectional conversion between the typical (for humans) trans-4-hydroxyproline and cis-4-hydroxy-D-proline. Archaea, trypanosomes, and possibly animals also perform this conversion. cis-4-Hydroxyproline (equivalently, (2S,4S)-) is found in the toxic cyclic peptides from Amanita mushrooms (e.g., phalloidin).
== Function == Cystinosin functions as a symporter which actively transports protons and cystine, the oxidized cysteine dimer, out of the lysosome. Cystinosin only transports L-CySS while other cystine transporters will work on various amino acids. If cystine builds up in the lysosome it will inhibit the normal functioning of the organelle making the transport function important in the regular functioning of cells. Cystinosin has also been discovered in melanosomes and has been linked to the control and regulation of melanin.
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 sold as a research chemical, but sports and medicine regulations restrict it.