circadian rhythm raises a handful of sensible questions. This page answers them in order, starting with the fundamentals and moving to applications.
Reviewed 2026-02-15. Anything still debated is marked as such rather than presented as settled.
Regulatory status varies by country and intended use. Major drug agencies have not granted marketing authorization for SR9009 as a medicine, and it is not listed as a controlled substance in many jurisdictions. It is often sold as a research chemical, a category that may fall outside pharmaceutical manufacturing rules. Buyers should verify local laws and supplier documentation, including certificates of analysis. The lack of standardized quality controls raises concerns about identity, purity, and actual content in products marketed online.
In laboratory settings, SR9009 is commonly identified by its molecular structure and its interaction with REV-ERB receptors. Vendors may list it under synonyms such as Stenabolic or REV-ERB agonist, but those names do not define purity or identity. Analytical confirmation typically uses high-performance liquid chromatography with ultraviolet detection or liquid chromatography–mass spectrometry. A reference standard is needed to compare retention time and mass spectrum, because the compound can be confused with related research chemicals.
Handling practices for SR9009 focus on minimizing degradation and contamination. The solid is generally stored desiccated at or below -20 °C, protected from light and moisture. Stock solutions are often prepared in dimethyl sulfoxide or ethanol, then aliquoted to avoid repeated freeze–thaw cycles. Aqueous solubility is low, so formulations for animal studies may require cosolvents or suspending agents. Personnel should follow institutional chemical safety procedures, because toxicological data for humans are incomplete.
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 |
|---|---|---|
| Appearance | White to off-white solid | Visual inspection is not sufficient for identity. |
| Solubility | Soluble in DMSO and ethanol | Low solubility in water. |
| Typical storage | -20 °C, desiccated, dark | Protect from repeated temperature changes. |
| Common analytical method | LC-MS or HPLC-UV | Reference standard required for comparison. |
| Common synonyms | SR9009; Stenabolic; REV-ERB agonist | Vendor naming may vary. |
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, lipid metabolism, and inflammatory gene expression. In cell and animal experiments, SR9009 alters transcription of clock-controlled genes and metabolic pathways. The compound is not a hormone and does not resemble classical steroid structures. Its activity depends on binding to the ligand-binding domain of REV-ERB, where it can modify corepressor recruitment.
Research interest in SR9009 grew from studies of circadian biology and metabolic disease. Preclinical reports describe effects on exercise capacity, muscle metabolism, and blood lipid levels in rodents, but these findings come from controlled laboratory settings. The compound has low oral bioavailability in animals, which limits systemic exposure after swallowing. Investigators often use injected routes in experiments to achieve measurable plasma concentrations. Human clinical data are sparse, no approved therapeutic product exists, and whether animal effects translate to humans remains an open question.
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.
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.
Cape Verde, Curaçao, Jordan, and Uzbekistan made their World Cup debuts. Qatar qualified for the tournament through qualification for the first time, as its only previous appearance was as host in 2022. DR Congo and Haiti returned to the tournament after appearing in their only previous tournament in 1974. Iraq returned to the tournament after appearing in its only previous tournament in 1986. Austria, Norway, and Scotland returned to the tournament after last appearing in 1998. Four-time champion Italy failed to qualify after losing the European playoff final to Bosnia and Herzegovina on penalties, becoming the first former champion to miss three consecutive World Cups; as in 2018 and 2022, Italy was the only former champion that did not qualify. With a FIFA Men's World Ranking of 12, Italy was also the highest-ranking team that did not qualify. The qualified teams, listed by region, with numbers in parentheses indicating final positions in the FIFA Men's World Ranking before the tournament were:
=== Relation to the Avogadro constant === The number of entities (symbol N) in a one-mole sample equals the Avogadro number (symbol N0), a dimensionless quantity. The Avogadro constant (symbol NA) is given by the Avogadro number multiplied by the unit reciprocal mole (mol−1), i.e. NA = N0/mol. The ratio n = N/NA is a measure of the amount of substance (with the unit mole). The Avogadro constant was determined by a measurement of the number of 28Si atoms in a single crystalline sample.
In 1997, cannabis was estimated to be overall the number four value crop in the US, and number one or two in many states, including California, New York, and Florida. This estimate is based on a value to growers of ~60% of retail value, or $3,000 per pound ($6,600/kg). In 2006, cannabis was estimated to have been a $36 billion market. This estimate has been challenged as exaggerated. The UN World Drug Report (2008) estimated that 2006 street prices in the US and Canada ranged from about US$8.8 to $25 per gram (approximately $250 to $700 per ounce), depending on quality. Typical U.S. retail prices were $10–15 per gram (approximately $280–420 per ounce). In 2017, the U.S. was estimated to constitute 90% of the worldwide $9.5 billion legal trade in cannabis. After some U.S. states legalized cannabis, street prices began to drop. In Colorado, the price of smokable buds (infructescences) dropped 40 percent between 2014 and 2019, from $200 per ounce to $120 per ounce ($7 per gram to $4.19 per gram). The European Monitoring Centre for Drugs and Drug Addiction reports that typical retail prices in Europe for cannabis varied from €2 to €20 per gram in 2008, with a majority of European countries reporting prices in the range €4–10.
WOMAC scale, taking into account pain, stiffness and functional limitation. Kellgren-Lawrence grading scale for osteoarthritis of the knee. It uses only projectional radiography features. Tönnis classification for osteoarthritis of the hip joint, also using only projectional radiography features.
Sources: en.wikipedia.org
==== Denervation supersensitivity ==== When the innervation to Substance P nerve terminals is lost, post-synaptic cells compensate for the loss of adequate neurotransmitter by increasing the expression of post-synaptic receptors. This, ultimately, leads to a condition known as denervation supersensitivity as the post-synaptic nerves will become hypersensitive to any release of Substance P into the synaptic cleft.
=== Cancer === The estimated new cases of digestive system cancer in the Unitied States in 2023 was 348,840 and the estimated number of deaths from digestive system cancers was 172,010. The major specific causes of digestive system cancer related death in 2023 were cancers of the colon and rectum (52,550), pancreas (50,550), liver and intrahepatic bile duct (29,380), esophagus (16,120) and stomach (11,130). Bile acids, when present in specific regions of the digestive system at abnormally high levels, have been implicated as important carcinogens.
TF 58 sailed west during the night to attack the Japanese at dawn. Search patrols were put up at first light. Ozawa had transferred to the destroyer Wakatsuki, but the radio gear on board was incapable of sending the number of messages needed, so he transferred again, to the carrier Zuikaku, at 13:00. He then learned of the disastrous results of the previous day and that he had about 150 aircraft left. Nevertheless, he decided to continue the attacks, thinking there were still hundreds of aircraft on Guam and Rota and started planning new raids for 21 June. The main problem for TF 58 was locating the enemy, who had been operating at a great distance. Early-morning American searches on 20 June found nothing. An extra mid-day search by Hellcat fighter pilots was also unsuccessful. Finally at 15:12 a garbled message from an Enterprise search plane indicated a sighting. At 15:40 the sighting was verified, along with distance, course, and speed. The Japanese fleet was 275 miles (443 km) out, moving due west at a speed of 20 knots. The Japanese were at the limit of TF 58's strike range, and daylight was slipping away. Mitscher decided to launch an all-out strike. After the first attack group had launched, a third message arrived, indicating the Japanese fleet were 60 miles (97 km) farther out than previously indicated. The first launch would be at their limits of fuel and would have to attempt landing at night. Mitscher canceled the second launch of aircraft but chose not to recall the first launch.
Sources: en.wikipedia.org
== Properties and applications == Cyclic peptides tend to be extremely resistant to the process of digestion, making them of interest to scientists working on novel oral medications. Examples include:
=== High androgen levels === CPA is used as an antiandrogen to treat high androgen levels and associated symptoms such as masculinization due to conditions like polycystic ovary syndrome (PCOS) and congenital adrenal hyperplasia (CAH) in women. It is almost always combined with an estrogen, such as ethinylestradiol, when it is used in the treatment of PCOS in women.
=== Lupus === As of 2016, studies in cells, animals, and humans have suggested that mTOR activation is a process underlying systemic lupus erythematosus and that inhibiting mTOR with rapamycin may be a disease-modifying treatment. As of 2016 rapamycin had been tested in small clinical trials in people with lupus.
Sources: en.wikipedia.org
Liquid chromatography–mass spectrometry is common for identity and purity checks. High-performance liquid chromatography with ultraviolet detection can also be used. Both methods require a suitable reference standard.
The solid is usually kept desiccated at -20 °C or lower and protected from light. Stock solutions are aliquoted to limit freeze–thaw cycles. Aqueous solutions are not generally recommended for long-term storage.
Laws differ by country and by intended use. It is not an approved medicine, and many vendors sell it as a research chemical. Purchasers are responsible for confirming local restrictions.
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.