The short version of LC-MS/MS fits in a sentence. The long version — which is the one that helps — is below.
This page was last updated on 2026-02-05 and is reviewed periodically as new material appears.
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.
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.
Laboratory studies indicate that GW501516 activates PPARδ, a nuclear receptor involved in fatty acid oxidation and energy metabolism. In rodent experiments, treated animals often showed increased endurance and reduced fat mass. These effects were observed under controlled conditions and do not establish safe or effective use in humans. The exact dose-response relationship in humans remains poorly characterized. Species differences in metabolism can affect how results translate across animals and people.
| Property | Value | Notes |
|---|---|---|
| Common synonyms | GW501516, GW-501516, GW 501516, endurobol | Names vary in research and anti-doping documents. |
| Chemical class | Synthetic PPARδ agonist | Small-molecule nuclear receptor ligand. |
| CAS Registry Number | 317318-70-0 | Identifier commonly associated with GW501516. |
| Appearance | White to off-white powder | Typical for purified research material. |
| Solubility | Low in water; soluble in DMSO and ethanol | Organic solvents are common for laboratory stock solutions. |
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.
Literature on cardarine often separates receptor pharmacology from toxicology. Mechanistic papers describe PPARδ activation and gene expression changes, while safety assessments focus on carcinogenicity and species differences. Questions remain about whether rodent tumors arise through PPARδ-dependent or off-target mechanisms. Another open area is how human metabolism and exposure compare with those in animal studies. Analytical methods such as liquid chromatography–mass spectrometry are used to confirm identity in biological and product samples.
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.
In September 2020, an in vitro and in vivo study found that DMT present in the ayahuasca infusion promotes neurogenesis. DMT has been found to be a psychoplastogen, a compound capable of promoting rapid and sustained neuroplasticity that may have wide-ranging therapeutic benefit. The cryo-EM structures of the serotonin 5-HT2A receptor with DMT, as well as with various other psychedelics and serotonin 5-HT2A receptor agonists, have been solved and published by Bryan L. Roth and colleagues.
A scenario is a set of related concepts pertinent to the origin of life (abiogenesis), such as the iron-sulfur world. Many alternative abiogenesis scenarios have been proposed by scientists in a variety of fields from the 1950s onwards in an attempt to explain how the complex mechanisms of life could have come into existence. These include hypothesized ancient environments that might have been favourable for the origin of life, and possible biochemical mechanisms.
{\displaystyle {\begin{aligned}y:\ &\rho \left({\partial _{t}u_{y}}+u_{x}{\partial _{x}u_{y}}+u_{y}{\partial _{y}u_{y}}+u_{z}{\partial _{z}u_{y}}\right)\\&\quad =-{\partial _{y}p}+\mu \left({\partial _{x}^{2}u_{y}}+{\partial _{y}^{2}u_{y}}+{\partial _{z}^{2}u_{y}}\right)+{\frac {1}{3}}\mu \ \partial _{y}\left({\partial _{x}u_{x}}+{\partial _{y}u_{y}}+{\partial _{z}u_{z}}\right)+\rho g_{y}\\\end{aligned}}}
=== Works cited === Ito, Koji (2020-08-31). "Review of the health benefits of habitual consumption of miso soup: focus on the effects on sympathetic nerve activity, blood pressure, and heart rate". Environmental Health and Preventive Medicine. 25 (1) 45. Bibcode:2020EHPM...25...45I. doi:10.1186/s12199-020-00883-4. PMC 7461326. PMID 32867671. Ichikawa, Tomomi (2020-03-25). "若年女性における排便状況と食事からの発酵食品摂取の関係" [A Study of the Relationship between Constipation Assessment and the Intake of Fermented Foods in the Diet of Young Women]. Journal of the Faculty of Human Life Studies (in Japanese). 7: 17–21. Archived from the original on 2021-08-05. Retrieved 2020-10-03.
Sources: en.wikipedia.org
Some Prefer Nettles (蓼喰う虫, Tade kū mushi; Historical orthography: 蓼喰ふ蟲) is a 1929 novel by Jun'ichirō Tanizaki. It was first published in 1928–9 as a newspaper serial. The novel is often regarded as the most autobiographical of Tanizaki's works and one of his finest novels. The Japanese title of the novel is literally water pepper-eating bugs, and is the first half of the Japanese saying tade kuu mushi mo sukizuki (蓼食う虫も好き好き), or "Water pepper-eating bugs eat it willingly", equivalent to the English "To each his own." The translation as Some Prefer Nettles was chosen by Edward Seidensticker. He considered it one of his most noted translations, and it has been included as a translation of the original saying in the authoritative Kenkyūsha's New Japanese-English Dictionary.
In 2025, the government of Ghana had amassed roughly US$15 million in unpaid bills for delivery services. In November 2025, the Minority in Parliament Zipline temporarily suspended three of its Ghanaian distribution centers due to the owed debt.
=== Zinc(I) compounds === Zinc(I) compounds are very rare. The [Zn2]2+ ion is implicated by the formation of a yellow diamagnetic glass by dissolving metallic zinc in molten ZnCl2. The [Zn2]2+ core would be analogous to the [Hg2]2+ cation present in mercury(I) compounds. The diamagnetic nature of the ion confirms its dimeric structure. The first zinc(I) compound containing the Zn–Zn bond, (η5-C5Me5)2Zn2 has been reported in 2004.
The compressional wave solutions used in the electromagnetic cloaking are transferred to material fluidic solutions where fluid motion is parallel to the wavevector. The computations then show that coordinate transformations can be applied to acoustic media when restricted to normal incidence in two dimensions. Next, the electromagnetic cloaking shell is referenced as an exact equivalence for a simulated demonstration of the acoustic cloaking shell. Bulk modulus and mass density determine the spatial dimensions of the cloak, which can bend any incident wave around the center of the shell. In a simulation with perfect conditions, because it is easier to demonstrate the principles involved, there is zero scattering in any direction.
=== Other === The liver stores a multitude of substances, including vitamin A (1–2 years' supply), vitamin D (1–4 months' supply), vitamin B12 (3–5 years' supply), vitamin K, vitamin E, iron, copper, zinc, cobalt, molybdenum, etc. Haemopoiesis - The formation of blood cells is called haemopoiesis. In the embryonic stage, RBCs and WBCs are formed by liver. In the first trimester fetus, the liver is the main site of red blood cell production. By the 32nd week of gestation, the bone marrow has almost completely taken over that task. The liver helps in the purification of blood. The Kupffer cells of liver are phagocytic cells that help in the phagocytosis of dead blood cells and bacteria from the blood. The liver is responsible for immunological effects – the mononuclear phagocyte system of the liver contains many immunologically active cells, acting as a 'sieve' for antigens carried to it via the portal system. The liver produces albumin, the most abundant protein in blood serum. Albumin is essential in the maintenance of oncotic pressure and acts as a transport for fatty acids and steroid hormones. The liver synthesizes angiotensinogen, a hormone that is responsible for raising the blood pressure when activated by renin, an enzyme that is released when the kidney senses low blood pressure. The liver produces the enzyme catalase to break down hydrogen peroxide, a toxic oxidising agent, into water and oxygen.
Sources: en.wikipedia.org
== Research == Insulin was discovered in 1921, by Frederick Banting, Charles Best and John Macleod at the University of Toronto. At a time when most child diabetics lived no more than months or a few years, insulin offered the hope of extending lives. Somogyi worked with Philip A. Shaffer and Edward Adelbert Doisy on insulin preparation and insulin's use in the treatment of diabetes. He developed a method for extracting insulin from the pancreases of dogs. In 1922 doctors treated the first diabetic American child, a baby boy, with Somogyi's insulin. Somogyi also developed a quicker, less expensive method for screening for diabetes, using sodium carbonate, urine, and heat. This led to the development of popular tests, including several varieties of urine sugar comparator from the Aloe Company of Saint Louis, Missouri. Urine Sugar Test kits were also produced by Eli Lilly and Company.
== Prevalence == In the United States, approximately 40,000 people were lobotomized, and in England, 17,000 lobotomies were performed. According to one estimate, in the three Nordic countries of Denmark, Norway, and Sweden, a combined figure of approximately 9,300 lobotomies was performed. Scandinavian hospitals lobotomized 2.5 times as many people per capita as hospitals in the US. According to another estimate, Sweden lobotomized at least 4,500 people between 1944 and 1966, mainly women. This figure includes young children. And in Norway, there were 2,005 known lobotomies. In Denmark, there were 4,500 known lobotomies. The Soviet Union banned the practice in 1950 on moral grounds. In Germany, it was performed only a few times. By the late 1970s, the practice of lobotomy had generally ceased, although it continued as late as the 1980s in France. As of 2019, legality of the procedure in the United States varies according to state law, with some states restricting it heavily, while others effectively leave its regulation to laws of general applicability.
Marcelino Arroyo, Francisco José de Caldas and Domingo de Petrés were great representatives of neo-classical architecture. The National Capitol is a great representative of romanticism. Wood was extensively used in doors, windows, railings, and ceilings during the colonization of Antioquia. The Caribbean architecture acquires a strong Arabic influence. The Teatro Colón in Bogotá is a lavish example of architecture from the 19th century. The quintas houses with innovations in the volumetric conception are some of the best examples of the Republican architecture; the Republican action in the city focused on the design of three types of spaces: parks with forests, small urban parks and avenues and the Gothic style was most commonly used for the design of churches. Deco style, modern neoclassicism, eclecticism folklorist and art deco ornamental resources significantly influenced the architecture of Colombia, especially during the transition period. Modernism contributed with new construction technologies and new materials (steel, reinforced concrete, glass and synthetic materials) and the topology architecture and lightened slabs system also have a great influence. The most influential architects of the modern movement were Rogelio Salmona and Fernando Martínez Sanabria. The contemporary architecture of Colombia is designed to give greater importance to the materials, this architecture takes into account the specific natural and artificial geographies and is also an architecture that appeals to the senses.
== Initial proposal and development == Neutron capture therapy (NCT) was first proposed in the literature in 1936 by Gordon L. Locher, who observed that isotopes with large neutron capture cross sections, such as boron-10, could be accumulated in cancerous tissue and bombarded with thermal neutrons to induce destruction of the cancerous cells. Boron was seen as a qualified candidate for NCT because the alpha particles of 10B (4He2+), produced from boron's reaction with a neutron beam, can induce apoptosis with a relatively tight travel radius about the diameter of a cell. The proposition was that boron-10 containing delivery agents would take advantage of properties of cancer cells that are not present in normal tissue cells, such as overexpression of certain enzymes or the lack of blood brain barrier. This idea was attractive because it had the potential to be more selective than traditional chemo- and radiotherapies. However, BNCT requires a neutron beam to act as a source of thermal neutrons and a suitable boron-delivery agent; neither was available at the time of Locher's suggestion. Therefore, it was not until the 1950s, when nuclear reactors were available, that Locher's proposal was put into practice. Since neutrons have a low penetration range, only about 2–3 cm below the skin's surface, BNCT was proposed for head and neck cancers.
=== HABA assay === The HABA (2-(4-hydroxyazobenzene) benzoic acid) assay can be used to determine the extent of biotinylation. HABA dye is bound to avidin or streptavidin and yields a characteristic absorbance. When biotinylated proteins or other molecules are introduced, the biotin displaces the dye, resulting in a change in absorbance at 500 nm. This change is directly proportional to the level of biotin in the sample. The disadvantage of the HABA assay is that it uses large amounts of sample.
Sources: en.wikipedia.org
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.
No. Cardarine is not a steroid hormone; it targets the nuclear receptor PPARδ. Its classification in anti-doping rules differs from anabolic steroids, though it remains prohibited in sport.
Early rodent studies reported tumor formation at multiple sites, which raised safety concerns. Sponsors stopped clinical development, and no approved human product exists.
Rodent studies reported increased endurance and fat oxidation after GW501516 exposure. Long-term studies also found higher rates of some tumors, which led to halted development.