This is a working overview of Anti-doping, written for readers who want more than a one-paragraph summary but less than a textbook.
Reviewed 2026-02-13. Anything still debated is marked as such rather than presented as settled.
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.
Sporting authorities added GW501516 to prohibited lists after it appeared in athlete samples and online markets. The World Anti-Doping Agency classifies it as a hormone and metabolic modulator, and its use can lead to an anti-doping rule violation. Some early laboratory work suggested effects on fatty acid oxidation and endurance-related metabolism in animals, but those findings do not establish safe or effective use in people. Reports of adverse events in humans are scarce and often anecdotal, which complicates risk assessment.
Legal status varies by country. In some places, cardarine is controlled under medicines or psychoactive substances laws; in others, it may be sold with minimal oversight as a research chemical. Customs agencies have intercepted shipments, and several national health agencies have issued warnings about products marketed for bodybuilding or performance enhancement. The lack of a standardized pharmaceutical supply means identity, purity, and contamination levels can differ widely between samples. These factors make cardarine a regulatory and public health concern rather than a conventional prescription drug.
Cardarine is a common name for GW501516, a synthetic compound first described in the 1990s as a selective agonist of the peroxisome proliferator-activated receptor delta. It was studied in preclinical models for metabolic and cardiovascular conditions, but it has not been approved as a medicine in the United States, Europe, or other major jurisdictions. Retail products labeled as cardarine are generally research chemicals or supplements, not pharmaceutical formulations. Because human safety and efficacy data remain limited, regulatory agencies treat it as an unapproved substance rather than a therapeutic product.
| 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. |
Products sold as cardarine have been found to contain incorrect compounds, variable amounts, or no active ingredient at all. Independent testing is required to verify identity and purity. Common analytical approaches include high-performance liquid chromatography, mass spectrometry, and nuclear magnetic resonance for structural confirmation. These methods can distinguish GW501516 from related PPAR agonists and from unrelated steroids. For regulators and researchers, such verification is central to interpreting both biological results and adverse event reports.
Cardarine is prohibited in competitive sport under the World Anti-Doping Agency code, where it is classified as a metabolic modulator. It is not approved as a prescription medicine in the United States, European Union, or other major markets. Regulatory action has focused on its presence in sports and in products marketed as research chemicals. Because it has no accepted medical indication, supply is often unregulated. This status creates legal and safety uncertainties for anyone who encounters the substance.
Anti-doping laboratories detect GW501516 and its metabolites using liquid chromatography-tandem mass spectrometry. Urine is the most common matrix, though blood and dried blood spots may also be used in some programs. Detection depends on factors such as dose, timing, metabolism, and the sensitivity of the assay. Published methods describe limits of detection in the low nanogram per milliliter range for related compounds. Exact detection windows are not fixed for all situations and remain an area of ongoing study.
In laboratory settings, cardarine is studied as a tool compound for probing PPARδ biology. Published experiments often use cell cultures, rodent models, or isolated tissues. Some investigations focus on metabolic effects, while others assess potential risks such as carcinogenicity observed in long-term animal studies. Because human trials are sparse, most knowledge comes from preclinical work and adverse event reports. Scientific literature frequently notes the gap between animal findings and human outcomes. The compound is not a dietary supplement and is not intended for human consumption.
Cardarine is a common name for GW501516, a synthetic compound developed in the 1990s through research collaborations involving GlaxoSmithKline. It belongs to a class of molecules known as peroxisome proliferator-activated receptor delta agonists. Early studies explored its effects on lipid metabolism and energy expenditure in animal models. The compound was never approved as a human medicine, and clinical development was discontinued. In the years since, it has appeared in fitness and bodybuilding communities as a performance-enhancing substance. Regulatory agencies classify it as an unapproved drug.
Anti-doping laboratories identify GW501516 and related metabolites using liquid chromatography coupled with tandem mass spectrometry. Urine is the most common matrix, though blood and dried blood spots may also be analyzed. The method targets the parent compound and phase I and phase II metabolites, which extend the detection window. Because the substance is prohibited at all times, athletes can be tested outside competition. Detection limits and windows depend on the assay, sample type, and individual metabolism.
Cardarine is frequently described as a fat-burning or endurance-enhancing supplement, but these claims exceed the available evidence. The compound is not a hormone, steroid, or selective androgen receptor modulator. Research articles discuss it as a tool compound for studying PPARδ biology, while anti-doping literature focuses on its abuse and detection. Quality of unapproved products is uncertain, and independent analyses have found impurities or incorrect labeling. Open questions include whether human cancer risk resembles that seen in rodents and how often non-athletes use the substance.
Cardarine has no approved therapeutic indication and is not marketed as a medicine. The World Anti-Doping Agency lists GW501516 as a prohibited substance at all times, covering both in-competition and out-of-competition periods. National laws vary: some countries treat it as an unapproved drug subject to import controls, while others have specific restrictions on sale for human consumption. It is often sold as a research chemical, a label that does not imply safety or legality. Enforcement actions have targeted online vendors and shipments.
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.
=== Expansion === In March 2020, many of the Cane's locations switched from dine-in to pick-up and take-out service only due to the COVID-19 pandemic, whereas others closed temporarily. As of July 2020, certain locations had reopened their dining rooms, although Graves said the company was in no rush to do so on a full scale. In 2021, in response to a shortage of workers at the time, the company began dispatching hundreds of its corporate employees to work in its restaurants as cooks and cashiers, in addition to their existing duties regarding the hiring of new employees. The company planned to hire 10,000 new employees. The company's co-CEO said that the corporate employees are trained in the kitchen and on the register under normal circumstances. In 2022, Raising Cane's sued a shopping center in Hobart, Indiana. After the restaurant chain had signed a long-term lease, it was revealed that the shopping center had a non-compete agreement with McDonald's which prohibited other vendors from selling de-boned chicken products in the complex. On June 27, 2023, Raising Cane's opened up their first New York location in Times Square.
== Energy drinks == Zenith International, UK-based food and drink consultants, reported in 2009 that no country consumes more energy drinks than Thailand, where the average adult consumer then drank 11.4 L (3 US gallons) per year, four times more than in the US, the leading consumer of energy drinks.
Chromosome analysis using a karyotype involves special stains that generate light and dark bands, allowing identification of each chromosome under a microscope. Fluorescence in situ hybridization (FISH) involves fluorescent labeling of probes that bind to specific DNA sequences, used for identifying aneuploidy, genomic deletions or duplications, characterizing chromosomal translocations and determining the origin of ring chromosomes. Chromosome painting is a technique that uses fluorescent probes specific for each chromosome to differentially label each chromosome. This technique is more often used in cancer cytogenetics, where complex chromosome rearrangements can occur. Array comparative genomic hybridization is a newer molecular technique that involves hybridization of an individual DNA sample to a glass slide or microarray chip containing molecular probes (ranging from large ~200kb bacterial artificial chromosomes to small oligonucleotides) that represent unique regions of the genome. This method is particularly sensitive for detection of genomic gains or losses across the genome but does not detect balanced translocations or distinguish the location of duplicated genetic material (for example, a tandem duplication versus an insertional duplication).
=== Cathodoluminescence === Cathodoluminescence is the most important tool paleontologists have for revealing whether or not the calcium in fossil eggshell has been altered. Calcite in eggshell is either pure or rich in calcium carbonate. However, the calcite composing the egg can be altered after burial to include significant calcium content. Cathodoluminescence causes calcite altered in this fashion to glow orange.
Sources: en.wikipedia.org
==== July 2021 settlement ==== Four major drug manufacturers and distributors, J&J, McKesson, Cardinal Health, and AmerisourceBergen, have agreed to a settlement announced by a group of state attorneys general in July 2021. The settlement, $26 billion (US), will be used on the prevention of opioid addiction and treatment programs. J&J will pay $5 billion (US) over the next five years; the remaining $21 billion (US) will be paid by the other firms. The settlement, when approved by a "significant" group of states and local governments, will settle more than 4,000 individual legal actions. All four of the manufacturing firms disputed all allegations in the lawsuits.
=== Notable cases === Napoleon – French general and emperor Arthur Kornberg – Nobel laureate in Physiology or Medicine, 1959 Nicky Wire, Manic Street Preachers – bassist Alexandr Dolgopolov – tennis player Jonas Folger – MotoGP rider
CE capillary is coupled directly to an electrospray ionization source with a sheathless interface system. The electric contact for ESI is realized by using capillary coated with conductive metal. Because no sheath liquid is used, the system has high sensitivity, low flow rates and minimum background. However, these interface designs, all have challenges including low mechanical robustness, poor reproducibility. The latest sheathless interface design features porous ESI emitter through chemical etching. This design effectively provides robust interfacing with mass spectrometry and addresses the reproducibility challenges associated with previous designs. This porous emitter interface has been explored to couple of CITP/CZE (or transient ITP) which greatly improves sample loading capacity of CE and enabled ultrasensitive detection of trace analytes. High reproducibility, robustness and sensitivity were achieved in sheathless transient capillary isatochophoresis (CITP)/capillary zone electrophoresis (CZE) -MS interface, where conductive liquid was used. Conductive liquid contacts with the metal-coated outer surface of the emitter completing the circuit, but at the same time it does not mix with separation liquid and therefore there is no sample dilution.
In Peru, the Incas subsisted on maize in the lowlands and potatoes at higher altitudes. They also used seeds from quinoa, supplementing their diet with peppers, tomatoes, and avocados. In ancient China, rice was the staple crop in the south and wheat in the north, the latter made into dumplings, noodles, and pancakes. Vegetables used to accompany these included yams, soybeans, broad beans, turnips, spring onions, and garlic. The diet of the ancient Egyptians was based on bread, often contaminated with sand which wore away their teeth. Meat was a luxury but fish was more plentiful. These were accompanied by a range of vegetables including marrows, broad beans, lentils, onions, leeks, garlic, radishes, and lettuces. The mainstay of the ancient Greek diet was bread, and this was accompanied by goat's cheese, olives, figs, fish, and occasionally meat. The vegetables grown included onions, garlic, cabbages, melons, and lentils. In ancient Rome, a thick porridge was made of emmer wheat or beans, accompanied by green vegetables but little meat, and fish was not esteemed. The Romans grew broad beans, peas, onions and turnips and ate the leaves of beets rather than their roots.
==== Disadvantages ==== There is an increasing risk of the practice of coprophagy when providing low-protein diets to dogs; a negative correlation exists between the amount of protein fed and the occurrence of coprophagy. Maintenance needs should still be met by low-protein diets, and the muscle turnover (i.e. synthesis and breakdown) will also remain at an optimal rate, as long as the amino acid intake remains balanced and there are no limiting amino acids. There is a greater opportunity for amino acids to balance in diets containing more protein.
Sources: en.wikipedia.org
Age-related macular degeneration (AMD) represents the leading cause of irreversible blindness in elderly people. AMD is an oxidative stress, retinal disease that affects the macula, causing progressive loss of central vision. β-carotene content is confirmed in human retinal pigment epithelium. Reviews reported mixed results for observational studies, with some reporting that diets higher in β-carotene correlated with a decreased risk of AMD whereas other studies reporting no benefits. Reviews reported that for intervention trials using only β-carotene, there was no change to risk of developing AMD.
The WPB placed penicillin under a wartime allocation system on 16 July 1943. All supplies were designated for use by the armed forces and the Public Health Service. Penicillin production in the United States ramped up from 800 million Oxford units in the first half of 1943 to 20 billion units in the second half. The US government built six production plants at a cost of $7.6 million (equivalent to $139 million in 2025). These were sold after the war to the companies that operated them for $3.4 million (equivalent to $56 million in 2025). Another sixteen plants were built by the private sector for $22.6 million (equivalent to $413 million in 2025), although $14.5 million (equivalent to $265 million in 2025) was approved for accelerated depreciation under which the cost could be written off in five years instead of the usual twelve to fifteen. US penicillin production rose from 21 billion units in 1943, to 1,663 billion units in 1944 and an estimated 6,852 billion units in 1945. By June 1944, Pfizer alone was producing 70 billion units per month. Monthly production dropped off after July 1945 due to a shortage of corn-steep liquor. The price offered by the CMR for a million units fell from $200 in 1943 (equivalent to $4,000 in 2025), which was below its manufacturing cost, to $6 in 1945 (equivalent to $107 in 2025). The chairman of the NRC committee on chemotherapy, Chester Keefer, was responsible for administering the equitable distribution of penicillin for civilian use on behalf of the CMR.
BrightStarSound.com Stanislav Petrov tribute website, multiple pages with photos and reprints of various articles about Petrov Nuclear War: Minuteman Article from Weekendavisen, 2 April 2004. The Nuclear War that Almost Happened in 1983 (posted September 5, 2003). History News Network, Originally in the Baltimore Sun of 31 August 2003 Armageddon Almost Not Averted "Sept. 26, 1983: The Man Who Saved the World by Doing ... Nothing". 30 years on: The day a computer glitch nearly caused World War III. The Register. 27 September 2013
Luteinizing hormone subunit beta also known as lutropin subunit beta or LHβ is a polypeptide that in association with an alpha subunit common to all gonadotropin hormones forms the reproductive signaling molecule luteinizing hormone. In humans it is encoded by the LHB gene.
== Discovery == In the late 1960s, non-selective serotonin receptor antagonists demonstrated a relationship between serotonin receptors and food intake. Later, animal studies showed that serotonin receptor agonists might act as a mediator of satiety. Serotonin has been implicated as a critical factor in the short-term regulation of food intake and in promoting loss of weight associated with hyperphagia. Studies using pharmacological and genetic tools demonstrated that the 5-HT2C receptor subtype was one of the principal mediators through which serotonin exerts its anorectic effects in rodents. Subsequently, these receptors became a promising pharmacotherapeutic target for further investigation for the treatment of obesity. The development of 5-HT2C receptor knockout mice in the mid-1990s was a hallmark achievement in the identification and development of serotonergic drugs for weight loss. These knockout mice were hyperphagic, which led to obesity, partial Leptin resistance, increased adipose deposition, insulin resistance, and impaired glucose tolerance. As a result of these symptoms, the researchers identified a functional role for the receptors in serotonergic regulation of food intake and body weight. Later, 5-HT2C receptors were proposed as a therapeutic target for the treatment of multiple central nervous system (CNS) disorders including: psychiatric disorders, obesity, sexual dysfunction and urinary incontinence.
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.
No. Major drug regulators have not approved GW501516 for treating any medical condition. Products sold as cardarine are typically unapproved research chemicals or supplements, so their contents and safety are not assured.