A practical reference on circadian clock: what it is, how it behaves, what the literature reports, and where the honest uncertainties sit.
This page was last updated on 2026-08-01 and is reviewed periodically as new material appears.
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.
The mechanism of action involves binding to REV-ERB receptors and recruiting corepressor complexes, which represses target gene transcription. This contrasts with many nuclear receptor agonists that activate transcription. Downstream effects may include changes in autophagy, mitochondrial biogenesis, and lipid handling, but the precise pathways remain an active area of study. Whether these molecular events translate into meaningful physiological effects in humans is unresolved. Most evidence comes from cultured cells and rodent models rather than human participants.
SR9009 is a synthetic small molecule developed as an agonist of the nuclear receptors REV-ERBα (NR1D1) and REV-ERBβ (NR1D2). These receptors help regulate circadian rhythms and metabolic gene expression. In cell and animal studies, SR9009 alters transcription of genes involved in lipid metabolism, inflammation, and mitochondrial function. It is not an approved medicine, and its pharmacological profile in humans remains largely uncharacterized. The compound is frequently discussed in the context of circadian biology and metabolic research rather than clinical use.
Preclinical reports have linked SR9009 to improved endurance and altered energy expenditure in rodents. Such findings have prompted interest in whether REV-ERB activation can influence skeletal muscle metabolism. However, the reported effects depend on dose, route, and experimental model, and replication across laboratories is limited. Human trials have not established comparable outcomes, so claims about exercise performance remain speculative. The absence of controlled human data is a central limitation in interpreting these observations.
| Property | Value | Notes |
|---|---|---|
| Common name | SR9009 | Also referred to as Stenabolic in non-scientific contexts. |
| Chemical class | Synthetic small molecule | Not a steroid or peptide hormone. |
| Receptor target | REV-ERBα and REV-ERBβ | Nuclear receptor agonist in preclinical studies. |
| Development status | Investigational | No approved human therapeutic indication. |
| Regulatory attention | Prohibited in sport | Listed by anti-doping authorities. |
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.
Claus von Bülow (born Claus Cecil Borberg; 11 August 1926 – 25 May 2019) was a British lawyer, consultant and socialite. In 1982, he was convicted of attempting to murder his wife Sunny von Bülow (born Martha Sharp Crawford; 1932–2008) in 1979, which had left her in a temporary coma, and in 1980, when an alleged insulin overdose left her in a persistent vegetative state for the rest of her life. On appeal, both convictions were reversed, and von Bülow was found not guilty at his second trial.
== Structure == hPL molecular mass is 22 125 Da and contains single chain consisting of 191 amino acid residues that are linked by two disulfide bonds and the structure contains 8 helices. A crystal structure of hPL was determined by X-ray diffraction to a resolution of 2.0 Å.
Surface tension theory – according to this theory, emulsification takes place by reduction of interfacial tension between two phases Repulsion theory – According to this theory, the emulsifier creates a film over one phase that forms globules, which repel each other. This repulsive force causes them to remain suspended in the dispersion medium Viscosity modification – emulgents like acacia and tragacanth, which are hydrocolloids, as well as PEG (polyethylene glycol), glycerine, and other polymers like CMC (carboxymethyl cellulose), all increase the viscosity of the medium, which helps create and maintain the suspension of globules of dispersed phase
== Pathogenesis == B. cereus is responsible for a minority of foodborne illnesses (2–5%), causing severe nausea, vomiting, and diarrhea. Bacillus foodborne illnesses occur when B. cereus spores or bacteria contaminate food and are allowed to survive cooking, and then given sufficient time to germinate, multiply, and produce toxins in the food. Normal cooking methods such as boiling, stewing, or steaming at 100 °C (212 °F) reliably kill Bacillus cereus vegetative cells, but do not reliably destroy heat-resistant spores. The risk is increased when cooked food is then slowly cooled or left within the temperature "danger zone", which is between 4 °C (39 °F) to 60 °C (140 °F), allowing spores to germinate. FDA's Food Code 2017 recommends that cooked food not meant for immediate consumption is cooled rapidly and refrigerated promptly at temperatures below 5 °C (41 °F), or is kept hot above 57 °C (135 °F). Refrigeration does not destroy bacteria but inhibits or slows their growth. Germination and growth generally occur between 10 °C and 50 °C, though some strains can grow at low temperatures, and Bacillus cytotoxicus strains have been shown to grow at temperatures up to 52 °C (126 °F). Bacterial growth results in production of enterotoxins, one of which is highly resistant to heat and acids (pH levels between 2 and 11); ingestion leads to two types of illness: diarrheal and emetic (vomiting) syndrome. The enterotoxins produced by B. cereus have beta-hemolytic activity.
In October 2022, The Gemma Collins Podcast was relaunched, then produced by Acast, who reportedly offered Collins up to "five-times more" than her BBC salary and granted her more "editorial control". The final episode of her podcast aired in February 2024. In December 2022, Collins appeared on the Channel 4 snow-sculpting competition The Greatest Snowman alongside Gareth Malone, Joe Thomas, Melvin Odoom and Yinka Bokinni, in which she created three sculptures; a unicorn, a team built castle alongside Odoom and Thomas, and a sculpture of herself. In March 2023, Collins appeared on the S4C series Mwy Na Daffs a Taffs, in which celebrities visited Wales and immersed themselves in Welsh culture, to disprove the preconceptions and prejudices they may have of the country. After meeting with presenter Miriam Isaac, she is accompanied by Ellis Lloyd Jones, known as drag queen Catrin Feelings, to Treorchy high street, where she visited a local café and sampled Welsh cakes and homemade trifle. She then visited family in Abertillery and discussed the fact that her grandfather used to work on building sites with Tom Jones. The following day she attended the 2022 Ceredigion National Eisteddfod in Tregaron where she was given a tour in a buggy, before observing Welsh folk dancing and the Chairing of the Bard ceremony, however decided to walk out of the latter due to the Gorsedd druids' attitude.
Sources: en.wikipedia.org
== History == Mirtazapine was first synthesized at Organon and published in 1989, was first approved for use in major depressive disorder in the Netherlands in 1994, and was introduced in the United States in 1996 under the brand name Remeron.
The French naturalist Georges-Louis Leclerc (1707–1788) underlined the benefits of donkey milk in his Histoire Naturelle. Some effects have been supported by systematic and scientific studies starting from the mid-1800s, especially by Russian doctors. Donkey and mare's milk are very similar, and it is assumed they have similar properties. The beneficial effects of equid milk, from the first historical sources to the present day, are aimed at:
Only four days after making this proclamation, the great announcement of the Independence of Argentina took place, with a large majority of the assembly members opting for the suggested monarchical form that, in addition, should have its headquarters in the city of Cuzco, the capital of the projected New Kingdom. Only Godoy Cruz and part of his collaborators demanded that said capital be in Buenos Aires. According to this "Plan del Inca", it would be an effective and constitutional parliamentary-style government, similar to the British one, to achieve prompt international recognition of Argentine independence. His proposal to establish a parliamentary Inca monarchy was ridiculed by his contemporaries who supported the formation of a republic, the original project was rejected mainly for reasons of anti-Peruvian racism. The Buenos Aires delegates expressed their total rejection of the delusional idea, almost without being heard. It is said that one of them came to shout there: "I'd rather be dead than serve a king with flip flops!"; and that the journalists from Buenos Aires mocked the decision, assuring that now he would have to go look for "a dirty-legged king in some grocery store or tavern in the Altiplano". The Congress of Tucumán finally decided to reject the Inca's plan because anti-Peruvian fellings, creating in its place a republican and centralist state with its capital in Buenos Aires.
Gentle cleansing and coverage of the wound with antibiotic ointment or petrolatum is recommended until sutures are removed in instances of primary closure or local flap repairs. Depending on varying factors such as tension of the wound, anatomic site, and personal patient factors, this usually occurs 5-14 days after the operation. On the other hand, immobilization and non-adherent dressings may be required for skin grafts. This is more intensive postoperative care, and better outcomes in select locations, like on the nose or foot, are associated with delayed grafting. For certain areas of the body, like the concave surface of the ear, secondary intention healing (SIH) may be the best option for healing as it is associated with good cosmetic outcomes and lower complications in the appropriate cases. SIH involves leaving the wound to heal naturally, by itself, with no intervention (including no stitches or grafts). The wound heals while the patient monitors for healthy tissue formation and keeps the area clean with dressing changes. To reduce the risk of bleeding, patients are generally advised not to carry over 10 pounds of weight and avoid excessive physical activity for 2-3 days after the procedure. Minor complications (outlined above in the Risks and Complications section) rarely occur and patients are usually able to continue their normal activity within days of the operation.
=== Choosing a support === Compatibility of support fabrics is crucial when selecting a support material. Because textiles vary so greatly careful research is necessary when making these choices. There are alternative options to fabric supports that are also important to consider. Composition, processing, structure, rigidity, and weight are all factors to consider when determining the appropriateness of a paper-based or non-textile material as a support for stabilization. The physical and chemical compatibility of textiles and long-term stability should also be evaluated for materials that will be stored in close proximity to textile artifacts.
Sources: en.wikipedia.org
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.
No. It is a small molecule that binds nuclear receptors involved in circadian regulation. Its classification differs from anabolic steroids or peptide hormones.
Published human clinical trial data are lacking. Most safety and activity information comes from preclinical models, so effects in people remain uncertain.
It is a synthetic compound that acts as an agonist at REV-ERBα and REV-ERBβ. It is used mainly as a research chemical to study circadian and metabolic pathways. It is not approved for human therapeutic use.