Everything below concerns PPARδ. We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Last reviewed on 2026-01-17. Where a claim depends on a specific study, the study is described rather than over-claimed.
GW501516 acts as an agonist at the peroxisome proliferator-activated receptor delta, a nuclear receptor that regulates gene expression. Activation shifts transcription toward genes involved in fatty acid uptake, oxidation, and energy expenditure. The compound does not bind the androgen receptor and therefore differs from anabolic steroids and SARMs. In rodent models, this metabolic shift has been linked to increased running endurance and reduced fat accumulation. The exact downstream pathways in humans remain incompletely characterized.
Early clinical research explored GW501516 for lipid disorders, obesity, and diabetes. Some short-term human studies reported changes in HDL cholesterol, LDL cholesterol, and triglycerides. The development program was discontinued after rodent studies showed dose-dependent tumor formation in multiple tissues, including liver, bladder, stomach, and skin. These findings raised concerns about long-term cancer risk in humans. Because human exposure data are limited, the clinical significance of the rodent tumors remains uncertain.
Cardarine is a synthetic compound also known as GW501516, GW-501516, and sometimes endurobol. It was developed as a selective agonist of peroxisome proliferator-activated receptor delta, a nuclear receptor involved in fatty acid oxidation and energy metabolism. The compound was studied in preclinical models for metabolic and cardiovascular conditions, but it did not become a marketed human medicine. In regulatory and anti-doping contexts, it is treated as a prohibited substance rather than a licensed medicine.
The pharmacological interest in cardarine centers on PPARδ activation and its downstream effects on lipid handling and mitochondrial function. In animal studies, PPARδ agonists have been associated with changes in exercise endurance and fatty acid utilization, though results vary by model and protocol. Human data remain sparse, and the absence of large controlled trials limits conclusions about efficacy. Researchers often describe the compound as a tool for probing PPARδ biology rather than a proven therapeutic agent.
| Property | Value | Notes |
|---|---|---|
| Primary target | PPARδ | Nuclear receptor; not androgen receptor |
| Studied indications | Dyslipidemia; obesity; diabetes | Early clinical research; development discontinued |
| Rodent toxicity | Tumor formation in multiple tissues | Dose-dependent findings in some studies |
| Human approval | None | No approved therapeutic use |
| Typical analytical method | LC-MS/MS | Used for identity and quantification |
Safety concerns emerged from long-term animal studies. In rodents given the compound for extended periods, researchers found an increased incidence of certain cancers, including liver and bladder tumors. These findings contributed to the discontinuation of clinical development. Whether similar risks apply to short-term or low-level exposure in humans is not established, and controlled human safety data are limited. The relevance of high-dose rodent carcinogenicity findings to human use remains a subject of debate.
Human trials of GW501516 were small and short in duration. They examined lipid levels, glucose handling, and other metabolic markers, but the programs were halted after the animal cancer findings. No approved therapeutic product exists, and published human data are insufficient for establishing long-term safety. Reports of use for athletic performance come mainly from non-clinical settings and cannot be verified through controlled trials. Independent testing of products sold as cardarine has found inconsistent purity and labeling.
Handling and quality assessment of cardarine reference material follow general laboratory practices for poorly characterized compounds. It typically appears as a white to off-white powder and is sparingly soluble in water but soluble in organic solvents such as dimethyl sulfoxide and ethanol. Storage recommendations usually specify a cool, dry, dark place, with long-term storage at low temperature and desiccation. Purity may be checked by high-performance liquid chromatography with ultraviolet detection, while identity is confirmed by mass spectrometry and nuclear magnetic resonance. No pharmacopeial monograph exists, so reported purity and stability depend on the supplier’s methods.
GW501516 acts as a selective agonist at PPARδ, a nuclear receptor that regulates transcription of genes involved in lipid handling and energy metabolism. Activation of PPARδ in preclinical models increases fatty acid oxidation, mitochondrial biogenesis, and exercise endurance in rodents. These effects have made the compound a subject of metabolic research and also a target for sport anti-doping rules. In humans, however, controlled studies are limited, and whether similar endurance or metabolic changes occur at tolerated exposures remains an open question. The receptor’s broad tissue distribution also means downstream effects may vary by organ and condition.
Detection of GW501516 in biological samples generally relies on liquid chromatography coupled with tandem mass spectrometry. Urine is a common matrix in anti-doping analysis, while blood or plasma may be used in research settings. Sample preparation can involve enzymatic hydrolysis, protein precipitation, or solid-phase extraction before instrumental analysis. Because the compound undergoes metabolism, assays may target the parent molecule, one or more metabolites, or both. Detection windows are not fixed; they depend on factors such as dose, route, individual metabolism, and assay sensitivity. Reference standards are required for accurate identification and quantification.
The reaction involves adsorption of protons onto S8 clusters, followed by disproportionation into the reaction products. The second, fourth and sixth ionization energies of sulfur are 2252 kJ/mol, 4556 kJ/mol and 8495.8 kJ/mol, respectively. The composition of reaction products of sulfur with oxidants (and its oxidation state) depends on whether releasing of reaction energy overcomes these thresholds. Applying catalysts and/or supply of external energy may vary sulfur's oxidation state and the composition of reaction products. While reaction between sulfur and oxygen under normal conditions gives sulfur dioxide (oxidation state +4), formation of sulfur trioxide (oxidation state +6) requires a temperature of 400–600 °C (750–1,100 °F) and presence of a catalyst. In reactions with elements of lesser electronegativity, it reacts as an oxidant and forms sulfides, where it has oxidation state −2. Sulfur reacts with nearly all other elements except noble gases, even with the notoriously unreactive metal iridium (yielding iridium disulfide). Some of those reactions require elevated temperatures.
{\displaystyle \varphi =\operatorname {atan2} (\mathbf {u} _{2}\cdot ((\mathbf {u} _{1}\times \mathbf {u} _{2})\times (\mathbf {u} _{2}\times \mathbf {u} _{3})),|\mathbf {u} _{2}|\,(\mathbf {u} _{1}\times \mathbf {u} _{2})\cdot (\mathbf {u} _{2}\times \mathbf {u} _{3})).}
The planters of the Dutch colony of Suriname relied heavily on African slaves to cultivate, harvest and process the commodity crops of coffee, cocoa, sugar cane and cotton plantations. The Netherlands abolished slavery in Suriname in 1863. Many slaves escaped the plantations. With the help of the native South Americans living in the adjoining rain forests, these runaway slaves established a new and unique culture in the interior that was highly successful in its own right. They were known collectively in English as Maroons, in French as Nèg'Marrons (literally meaning "brown negroes", that is "pale-skinned negroes"), and in Dutch as Marrons. The Maroons gradually developed several independent tribes through a process of ethnogenesis, as they were made up of slaves from different African ethnicities. These tribes include the Saramaka, Paramaka, Ndyuka or Aukan, Kwinti, Aluku or Boni, and Matawai. The Maroons often raided plantations to recruit new members from the slaves and capture women, as well as to acquire weapons, food and supplies. They sometimes killed planters and their families in the raids. The colonists also mounted armed campaigns against the Maroons, who generally escaped through the rain forest, which they knew much better than did the colonists. To end hostilities, in the 18th century the European colonial authorities signed several peace treaties with different tribes. They granted the Maroons sovereign status and trade rights in their inland territories, giving them autonomy.
Sources: en.wikipedia.org
=== Electrospray ionization interface === In the first CE–MS interface a stainless steel capillary sheath around the separation capillary terminus was used instead of terminus electrode in typical CE setup. An electrical contact of stainless steel capillary with background electrolyte flowing out from the separation capillary was made at that point completing the circuit and initiating the electrospray. This interface system had few drawbacks like mismatch in the flow rates of two systems. Since then, interface system has been improved to have continuous flow rate and good electrical contact. Another key factor for successful CE–MS interface is the choice of buffer solution which must be suitable for both CE separation and ESI operation. At present, three types of interface system exist for CE/ESI-MS which are discussed briefly.
== Research directions == Outside of H. pylori eradication and ulcer management, the broader antimicrobial potential and gastric‑protective roles of bismuth subcitrate are not well studied in clinical trials; this is a potential research direction. Bismuth is also studied on potential antiviral and antileishmanial applications.
As a consequence of the exchange rate policy, the bank must always adjust its interest rates to ensure a stable exchange rate and consequently cannot at the same time conduct monetary policy to stabilize e.g. domestic inflation or unemployment rates. This makes the conduct of stabilization policy fundamentally different from the situation in Denmark's neighbouring countries like Norway, Sweden, Poland and the United Kingdom, in which the central banks have a central stabilizing role. Denmark is presently the only OECD member country maintaining an independent currency with a fixed exchange rate. Consequently, the Danish krone is the only currency in the European Exchange Rate Mechanism II (ERM II), before Bulgaria and Croatia joined in 2020 (the latter uses the euro since 2023) In the first months of 2015, Denmark experienced the largest pressure against the fixed exchange rate for many years because of very large capital inflows, causing a tendency for the Danish krone to appreciate. Danmarks Nationalbank reacted in various ways, chiefly by lowering its interest rates to record low levels. On 6 February 2015 the certificates of deposit rate, one of the four official Danish central bank rates, was lowered to −0.75%. In January 2016 the rate was raised to −0.65%, at which level it has been maintained since then. Inflation in Denmark as measured by the official consumer price index of Statistics Denmark was 1.1% in 2017. Inflation has generally been low and stable for the last decades.
Aqueous normal-phase chromatography (ANP) is a chromatographic technique that uses a polar stationary phase with a nonpolar mobile phase that contains water. It is "normal-phase" in the sense that polar analytes are retained by a polar stationary phase, but it differs from classical normal-phase chromatography in that the mobile phase contains water.
Sources: en.wikipedia.org
Fluvoxamine (Luvox, Faverin, Fevarin and Dumyrox) Imatinib (Gleevec): Although no formal studies with imatinib and grapefruit juice have been conducted, the fact that grapefruit juice is a known inhibitor of the CYP 3A4 suggests that co-administration may lead to increased imatinib plasma concentrations. Likewise, although no formal studies were conducted, co-administration of imatinib with another specific type of citrus juice called Seville orange juice (SOJ) may lead to increased imatinib plasma concentrations via inhibition of the CYP3A isoenzymes. Seville orange juice is not usually consumed as a juice because of its sour taste, but it is found in marmalade and other jams. Seville orange juice has been reported to be a possible inhibitor of CYP3A enzymes without affecting MDR1 when taken concomitantly with ciclosporin. Ketamine: After drinking 200 mL of grapefruit juice daily for five days, the overall absorption of orally ingested ketamine was increased three-fold compared to the control group in a clinical trial. The peak blood ketamine concentration was increased over two-fold. Levothyroxine (Eltroxin, Levoxyl, Synthroid): "Grapefruit juice may slightly delay the absorption of levothyroxine, but it seems to have only a minor effect on its bioavailability." Losartan (Cozaar) Methadone: Inhibits the metabolism of methadone and raises serum levels. Omeprazole (Losec, Prilosec) Oxycodone: Grapefruit juice enhances the exposure to oral oxycodone.
== History == Lethal injection gained popularity in the late 20th century as a form of execution intended to supplant electrocution, gas inhalation, hanging and firing squad, which were considered less humane. It has become the most common form of legal execution in the United States. Lethal injection was proposed on January 17, 1888, by Julius Mount Bleyer, a New York doctor who praised it as being cheaper than hanging. Bleyer's idea would not be revived until the mid-1970s, when Texas and Oklahoma adopted the modern version of the method; a series of botched executions led to an eventual rise of public disapproval of electrocutions in the 1980s. Lethal injections were first used by Nazi Germany to execute prisoners during World War II. Nazi Germany developed the Aktion T4 euthanasia program led by Karl Brandt as one method to terminate Lebensunwertes Leben ("life unworthy of life"). During the war, lethal injections were also administered to children detained at the Sisak concentration camp by the camp's commander, the physician Antun Najžer. The Royal Commission on Capital Punishment 1949–1953 considered lethal injection but eventually ruled it out after pressure from the British Medical Association (BMA).
==== France ==== France was one of the countries that inherited a knowledge of apple cultivation from both the Celtic Gauls and the later Romans, who ruled the country for approximately 500 years: both had knowledge of grafting and keeping apples. The earliest mentions of cider in this country go back to the Greek geographer Strabo: he speaks of the profusion of apple trees in Gaul and describes a cider-like drink. In the 9th century, Charlemagne, in the Capitulars, ordered skilled brewers (the Sicetores) to always be present on his estates to make him ale, "pommé" (pomacium), perry and all the liquors liable to be used as drinks, and also ordered an expansion of planting apple trees in what is now Northern France. French cidre (French pronunciation: [sidʁ]) is an alcoholic drink produced predominantly in Normandy and Brittany. It varies in strength from below 4% alcohol to considerably more. Cidre Doux is a sweet cider, usually up to 3% in strength. 'Demi-Sec' is 3–5% and Cidre Brut is a strong dry cider of 4.5% alcohol and above. Most French ciders are sparkling. Higher quality cider is sold in champagne-style bottles (cidre bouché). Many ciders are sold in corked bottles, but some screw-top bottles exist. In crêperies (crêpe restaurants) in Brittany, cider is generally served in traditional ceramic bowls (or wide cups) rather than glasses. A kir Breton (or kir normand) is a cocktail apéritif made with cider and cassis, rather than white wine and cassis for the traditional kir. The Domfrontais, in the Orne (Basse-Normandie), is famous for its pear cider (poiré).
Anorexia nervosa is an eating disorder characterized by attempts to lose weight by way of starvation. A person with anorexia nervosa may exhibit a number of signs and symptoms, the type and severity of which may vary and be present but not readily apparent. Although anorexia is often recognized by the physical signs, it is a mental disorder that can occur at any body weight: in the case where BMI remains at a healthy amount in adults, atypical anorexia nervosa is diagnosed. Anorexia nervosa, and the associated malnutrition that results from the self-imposed starvation, causes complications in every major organ system in the body. It can cause permanent changes in the brain due to a lack of essential nutrients in the body. Hypokalemia, a drop in the level of potassium in the blood, is a sign of anorexia nervosa. A significant drop in potassium can cause abnormal heart rhythms, constipation, fatigue, muscle damage, and paralysis. Signs and symptoms may be classified in various categories including: physical, cognitive, affective, behavioral and perceptual:
Many startups were unable to retrieve money, resulting in companies taking out loans to make payroll. Because California state law requires employees to be paid within a certain number of days, continued inability to access deposits could have caused a large number of startups to furlough workers, reduce their workforce through layoffs, or shut down entirely. The bank's collapse also reduces available funding for startups on the venture debt market, which has grown in importance as venture capital firms have dramatically scaled back their investments. E-commerce company Etsy was forced to delay seller payouts; the company used SVB to send out deposits to some sellers. The bank's collapse coincided with the beginning of the annual, startup-oriented South by Southwest Interactive conference in Austin, Texas. Aside from some disruption caused by SVB credit cards, attendees maintained an air of calm during the event. In the days after the collapse, startup founders and other customers lined up outside bank branches in Silicon Valley and San Francisco, seeking to withdraw their deposits or learn the status of their wire transfers. Many technology entrepreneurs regained access to their deposits on March 13. In a Securities and Exchange Commission (SEC) filing, streaming media company Roku, Inc. revealed that around a quarter of the company's cash reserves—$487 million—were held by SVB. Other companies affected by the collapse include video game developer Roblox Corporation, video hosting service Vimeo, and payroll processor, Rippling.
Sources: en.wikipedia.org
It targets PPARδ, a nuclear receptor involved in lipid and energy metabolism. It does not act primarily on androgen receptors. This distinction separates it from SARMs.
Rodent studies found dose-dependent tumors in several organs. The sponsor discontinued the program over cancer concerns. Human risk from long-term use remains unknown.
Controlled human endurance trials are lacking. Animal studies show increased exercise capacity under some conditions. Anecdotal reports are not equivalent to clinical evidence.
Cardarine is an investigational synthetic compound that acts as a PPARδ agonist. It is also known as GW501516 and has been studied mainly in preclinical research. It is not an approved medicine.