NR1D2 comes up often in conversation and rarely with the context attached. Here we lay out the basics in order, then work through the practical considerations.
Updated 2025-09-12. Numbers and descriptions here follow the published literature rather than marketing material.
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.
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.
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.
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.
| Property | Value | Notes |
|---|---|---|
| Chemical class | Synthetic REV-ERB agonist | Small molecule; not a steroid or peptide. |
| Primary targets | NR1D1 and NR1D2 | Also known as REV-ERBα and REV-ERBβ. |
| Studied routes | Intraperitoneal in rodents | Oral bioavailability in humans is not established. |
| Human approval | No approved therapeutic indication | No recognized clinical use. |
| Key uncertainty | Human physiological effects | Preclinical findings may not translate. |
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.
=== Neurodegeneration === CRH has also been shown to promote neurodegeneration, suggesting that CRH1 antagonists may have neuroprotective effects. PC12 cells are derived from the rat adrenal medulla and are extensively used to study neural differentiation. PC12 cells treated with CRH (1-10 nM) showed increased numbers of apoptotic cells and upregulation of the Fas ligand via p38 activation, demonstrating the pro-apoptotic effects of CRH. Administration of antalarmin (10 nM) completely blocked the CRH-induced apoptosis response and inhibited Fas ligand expression.
Compounding the concerns over massive pre-orders by wealthy countries, manufacturing capacity is also limited by the fact that most vaccines are patented by companies in those countries. India and South Africa proposed a waiver to the TRIPS Agreement which would remove exclusivity agreements as a barrier to setting up new facilities but the measure is being blocked by the G7.
Beans – is a common name for large plant seeds used for human food or animal feed of several genera of the family Fabaceae (alternately Leguminosae). The term is sometimes used as a synonym of pulse, though the term pulses is usually reserved for leguminous crops harvested for their dry grain. Dried beans include kidney beans, black turtle beans, pinto beans, and several others. Grain – consists of wheat, corn, soybean, rice, and other grains as sorghum, sunflower seeds, rapeseed/canola, barley, oats, etc. are dried in grain dryers. In the main agricultural countries, drying comprises the reduction of moisture from about 17–30% to 8-15%, depending on the grain. The final moisture content for drying must be adequate for storage. Additional grains include lentils, wild rice, chick peas, and millet. Egusi: Dried melon seeds used in west African cooking, popular for Egusi sauce. Some varieties of maize (usually called corn in North America) are dried to produce popcorn. Popcorn kernels with a high moisture content will pop when freshly harvested, but not well, and are also susceptible to mold when stored. So, popcorn growers and distributors dry the kernels until they reach the moisture level at which they expand (pop) the most when cooked. Dried maize left on the ear is also used for decorative purposes.
Sources: en.wikipedia.org
Bupropion has a particularly odd pattern of inducing DAT inhibition, since it displays markedly enhanced binding affinity towards the DAT-(NET S1) mutant (DAT with NET primary binding site) over normal (wild-type) DAT, and noticeably diminished binding affinity towards the NET-(DAT S1) mutant (NET with DAT primary binding site) over regular (wild-type) NET. In spite of clear preference for NET binding site by itself, bupropion retains overall preference for complete DAT, implying that bupropion may make use of non-binding sites on the DAT molecule to exert its own binding, as well as the potential of augmented affinity for NET if its binding site is otherwise conformationally exposed. Bupropion has been claimed to be a sigma σ1 receptor agonist. Its antidepressant-like effects in rodents depend on σ1 receptor activation. They are enhanced and inhibited by σ1 receptor agonists and antagonists, respectively. However, no data on the binding or functional effects of bupropion at the human sigma receptors seem to be available. In any case, bupropion has been reported to bind to rodent σ1 receptors with IC50Tooltip half-maximal inhibitory concentration values of 580 to 2,100 nM. In contrast to many other phenethylamines and amphetamines, bupropion is not an agonist of the trace amine-associated receptor 1 (TAAR1). Bupropion has been found to have a mixture of anti-inflammatory and pro-inflammatory activity through modulation of the immune system. One such mechanism underlying these effects may be reduced levels of the pro-inflammatory cytokine tumor necrosis factor alpha (TNFα).
Commenting on a report released by The Asthma Foundation, Turner said it confirmed concerns that poverty and deprivation impacted greatly on respiratory disease in New Zealand children, and the underlying causes needed to be addressed to ensure that children and families had adequate income, good housing and easy access to health care. In 2015 after the Children's Commissioner released data showing that at the time, there were 305,000 children living in poverty in New Zealand – an increase of 45,000 from the previous year – Turner said that child poverty was now a national issue, not just for individual parents, and there appeared to be an unwillingness to resource a solution to the problem.
=== Osmotic drying using a humectant === Osmotic dehydration is the process of soaking food in highly concentrated solutions of humectant. Salt and sugar are commonly used humectants for this process. Water diffusion from the food to the humectant solution is caused by osmotic pressure. The water is replaced by the humectant, which results in a lowered water activity for the food product. Osmotic dehydration process results in two way mass transfer in regards to the moisture lost and the solids gained, with moisture loss being much greater than the addition of solids. Advantages of osmotic dehydration include low processing temperatures, short drying times, and 20-30% lower energy consumption than typical dehydration processes. Sugar is used as the humectant for candied intermediate moisture fruits, and salt is used for intermediate moisture vegetables and fish. Additionally, a mixture of humectants can be formulated to manipulate the sensory properties of the food product. Osmotic drying using a humectant results in a soft texture in the final product.
Upon adding phenol to deuterated water (water containing D2O in addition to the usual H2O), a hydrogen-deuterium exchange is observed to affect phenol's hydroxyl group (resulting in C6H5OD), indicating that phenol readily undergoes hydrogen-exchange reactions with water. Mainly the hydroxyl group is affected—without a catalyst, the other five hydrogen atoms are much slower to undergo exchange—reflecting the difference in chemical environments between the hydroxyl hydrogen and the aryl hydrogens.
Sources: en.wikipedia.org
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.
REV-ERB receptors generally repress transcription when bound by natural heme. SR9009 is described as an agonist that enhances this repressive activity. The result is altered expression of clock and metabolic genes.
Published controlled human trials are lacking. Some sources cite limited or unofficial reports, but these do not establish safety or efficacy. Claims about human performance effects remain unverified.
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.