A practical reference on LC-MS: 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.
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.
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.
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.
| 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. |
SR9009 is a synthetic small molecule developed as a REV-ERB agonist. It binds to REV-ERBα and REV-ERBβ, nuclear receptors that help regulate circadian rhythms and metabolic gene expression. In cell and animal studies, the compound alters lipid and glucose handling and influences skeletal muscle oxidative capacity. Its exact effects in humans remain largely uncharacterized because controlled clinical trials have not been reported. The molecule is frequently described in preclinical literature as a metabolic modulator.
Research interest in SR9009 grew from studies showing improved running endurance in mice after short treatment periods. Those experiments linked the compound to increased mitochondrial content and fatty acid oxidation in muscle, but the findings come from animal models and specific dosing schedules. Independent replication has been limited, and the pathways connecting REV-ERB activation to exercise performance are still being mapped. Whether similar responses occur in humans is an open question.
SR9009 is often grouped with compounds studied for circadian and metabolic regulation rather than with classical anabolic steroids. Its interactions with nuclear receptors differ from those of androgen receptor ligands, and its proposed mechanisms involve transcriptional control rather than direct hormone signaling. Some sources classify it as a metabolic modulator because of observed effects on energy utilization. The distinction matters for regulation and for interpreting research results across different compound classes.
Analytical methods for SR9009 typically rely on liquid chromatography coupled with tandem mass spectrometry. The technique can separate the parent compound from related substances and detect low concentrations in biological matrices. Urine and blood are common samples in anti-doping testing, while in vitro studies may use cell culture media. Rapid metabolism and low expected concentrations make method validation important for reliable identification. Exact metabolite patterns can vary by species and are not fully mapped.
Regulatory treatment of SR9009 reflects its investigational status. The compound has no approved human therapeutic indication, and sports authorities prohibit its use. It appears on anti-doping lists as a non-approved substance or metabolic modulator, depending on the list version. Products sold online as research chemicals are not quality-controlled medicines, so their identity and purity can differ from the label. Such products may also contain unlisted compounds, which complicates both testing and safety assessment.
==== Dunwall ==== Antonov was the principal designer of the city of Dunwall, Dishonored's steampunk dystopian setting described as an "oily" labyrinth of brickwork buildings. The city, whose economy is centered around the whaling industry, is governed by an authoritarian monarchist regime filled with officials too "callous" to deal with its residents' problems. During the events of the game, Dunwall is experiencing a plague virus which originated from its overwhelming rat population. It has significant wealth inequality, and the plague has trapped its lower class inside the city, "condemned to die by either an infection in the body or a knife in the heart", Levi Winslow writes for Kotaku. The city features a mix of Victorian and Gothic architecture, and was inspired by British cities, mainly London and Edinburgh, as they were from the mid-1800s to 1930. Antonov stated that that Britain is "both exotic and familiar to Americans and to Europeans, so it was just about perfect".
The OBBBA expands work requirements for SNAP benefits (formerly called "food stamps") recipients and makes states responsible for some costs relating to the food assistance program. The OBBBA includes $150 billion in new defense spending and another $150 billion for border enforcement and deportations. The law increases the funding for Immigration and Customs Enforcement (ICE) from $10 billion to more than $100 billion by 2029, making it the single most funded federal law enforcement agency. The Congressional Budget Office (CBO) estimates the law will increase the budget deficit by $2.8 trillion by 2034 and cause 10.9 million Americans to lose health insurance coverage. Further CBO analysis estimated the highest 10% of earners would see incomes rise by 2.7% by 2034 mainly due to tax cuts, while the lowest 10% would see incomes fall by 3.1% mainly due to cuts to programs such as Medicaid and food aid. Several think tanks, experts, and opponents criticized the bill over its regressive tax structure, described many of its policies as gimmicks, and argued the bill would create the largest upward transfer of wealth from the poor to the rich in American history, exacerbating inequality among the American population. It has also drawn controversy for rolling back clean energy incentives and increasing funding for immigration enforcement and deportations. According to multiple polls, a majority of Americans oppose the law. Democratic opposition to the health spending cuts included in the OBBBA contributed to the 2025 United States federal government shutdown.
==== Plans to sell TikTok's US operations ==== Since at least 2020, following calls to ban TikTok in the country, the Committee on Foreign Investment in the United States (CFIUS) has been investigating the company's 2017 merger with Musical.ly but has not finalized any of its negotiations with TikTok, such as the Project Texas proposal, waiting instead for Congress to act. In January 2025, Chinese officials began preliminary talks about potentially selling TikTok's US operations to Elon Musk if the app faced an impending ban due to national security concerns. While Beijing preferred TikTok remain under ByteDance's control, the sale could happen through a competitive process or with US government involvement. One possibility involved Musk's platform, X, taking over TikTok's US business. The move came ahead of a Supreme Court case that upheld the constitutionality of a law that would force a sale or ban of TikTok in the US by 19 January 2025, due to national security concerns regarding its ties to China. Other potential buyers included Project Liberty's "The People's Bid For TikTok" consortium of Frank McCourt with Kevin O'Leary, Steven Mnuchin, and Bobby Kotick, and an investor consortium led by Employer.com founder Jesse Tinsley that included Roblox CEO David Baszucki and YouTuber MrBeast and claimed to have secured over US$20 billion in commitments. The seriousness of these potential buyers was unclear. The day before the impending ban, California-based conversational search engine company Perplexity AI submitted a bid for a merger with TikTok US.
Sources: en.wikipedia.org
Engineering is the process by which technology is developed. It often requires problem-solving under strict constraints. Technological development is "action-oriented", while scientific knowledge is fundamentally explanatory. Polish philosopher Henryk Skolimowski framed it like so: "science concerns itself with what is, technology with what is to be." The direction of causality between scientific discovery and technological innovation has been debated by scientists, philosophers and policymakers. Because innovation is often undertaken at the edge of scientific knowledge, most technologies are not derived from scientific knowledge, but instead from engineering, tinkering and chance. For example, in the 1940s and 1950s, when knowledge of turbulent combustion or fluid dynamics was still crude, jet engines were invented through "running the device to destruction, analyzing what broke [...] and repeating the process". Scientific explanations often follow technological developments rather than preceding them. Many discoveries also arose from pure chance, like the discovery of penicillin as a result of accidental lab contamination. Since the 1960s, the assumption that government funding of basic research would lead to the discovery of marketable technologies has lost credibility. Probabilist Nassim Taleb argues that national research programs that implement the notions of serendipity and convexity through frequent trial and error are more likely to lead to useful innovations than research that aims to reach specific outcomes.
== Diagnosis == Zinc concentrations are typically quantified using instrumental methods such as atomic absorption, emission, or mass spectroscopies; X-ray fluorescence; electro-analytical techniques (e.g., stripping voltammetry); or neutron activation analysis. Inductively coupled plasma atomic emission spectroscopy (ICP-AES) is used for zinc determinations in blood and tissue samples (NIOSH Method 8005) and in urine (NIOSH Method 8310). Detection limits in blood and tissue are 1 μg/100 g and 0.2 μg/g, respectively, with recoveries of 100% (NIOSH 1994). Sample preparation involves acid digestion using concentrated acids. Detection of zinc in urine samples requires extraction of the metals with a polydithiocarbamate resin prior to digestion and analysis (NIOSH 1984). Detection limits in urine are 0.1 μg/sample.
==== 2020s ==== On March 20, 2020, due to the COVID-19 pandemic, Starbucks closed all the café-only stores in the United States for two weeks. During that time, only drive-thru and delivery-only services were to function. According to the company representatives, all workers were to be paid for the next 30 days whether they went to work or stayed home. COVID-19 lockdowns caused Starbucks to suffer a general 10% sales decrease, and a 50% decrease in China where quarantine measures were especially strict. In May 2020, the company asked for reduced rent from landlords due to the decrease in sales. In June 2020, during the COVID-19 pandemic in the United States, the company announced that it would close 400 of its locations in the US/Canada region over the subsequent 18 months as it moves from the coffee house concept to "convenience-led" formats with drive-through and curbside pickup. Starbucks announced that it planned to open 300 stores that would primarily focus on carryout and pickup orders. The new stores would work with the Starbucks mobile app for prepayment by the customer before arrival to pick up the order. The layout of some stores would also be modified with a separate counter for picking up mobile orders. In December 2020, Starbucks announced that it is planning to increase its store count to about 55,000 by 2030, up from roughly 33,000. Bloomberg reported in July 2022 that the company was, through investment bank Houlihan Lokey, exploring selling its stores in the United Kingdom.
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.
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.