Prohibited substance raises a handful of sensible questions. This page answers them in order, starting with the fundamentals and moving to applications.
Reviewed 2025-11-26. 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.
Safety discussions about cardarine frequently cite rodent carcinogenicity findings reported in the 2000s. In those studies, treated animals developed tumors at multiple sites, leading sponsors to discontinue clinical development. The relevance of these findings to humans has not been resolved, but they are a major reason the compound is not approved. Current literature emphasizes uncertainty about long-term effects and the risks of unregulated use. Regulators and health agencies have not established a safe human exposure level.
GW501516 acts on PPARδ, a nuclear receptor that helps regulate fatty acid oxidation and energy homeostasis. In animal studies, activation of this receptor was associated with increased endurance and changes in lipid metabolism. Human trials examined effects on blood lipids and other metabolic markers, but the compound did not advance to approval. Rodent studies later reported tumors in multiple tissues at doses used in those experiments. Whether those findings translate to human risk remains uncertain, and the clinical relevance of the animal data is still debated.
Regulatory bodies treat GW501516 as a prohibited substance in competitive sport. The World Anti-Doping Agency added it to the prohibited list, and it falls under classes covering metabolic modulators and hormone-related agents. It is not approved by drug regulators for human use, and it is not a lawful dietary supplement. Products sold under the cardarine name may contain unlisted ingredients or different compounds. Because no approved product exists, quality and identity are not guaranteed by pharmaceutical manufacturing standards.
Cardarine is a common name for the investigational chemical GW501516, also written GW-1516. It was developed as a peroxisome proliferator-activated receptor delta agonist for metabolic conditions such as dyslipidemia. Early research focused on lipid handling and energy use in skeletal muscle and other tissues. The compound was never approved as a medicine. In public discussion, it is often grouped with performance-enhancing substances, although its receptor target differs from that of anabolic steroids or selective androgen receptor modulators. Regulatory and health authorities have issued warnings about its use.
| 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.
Published studies have examined GW501516 in animal models of obesity, insulin resistance, and exercise endurance. Early human trials reportedly ended, and development was discontinued after preclinical findings raised concerns about cancer in some rodent studies. Regulatory agencies have not approved cardarine for any medical use. Its availability through non-pharmaceutical channels raises questions about identity, purity, and legal status that are separate from its laboratory pharmacology. Those questions are often addressed through analytical testing rather than assumptions about product labels.
Cardarine is a common name for GW501516, also GW-1516, a synthetic compound developed as a peroxisome proliferator-activated receptor delta (PPARδ) agonist. It belongs to a class of agents that modulate gene transcription related to lipid and energy metabolism. The compound was studied in preclinical and early clinical research for metabolic and cardiovascular conditions, but it did not progress to approved therapeutic use. Its name appears in fitness and sports contexts despite not being approved as a drug.
==== Phase I ==== The clinical trial Phase I began on 15-16 August at Hanoi Medical University. Phase I was conducted on 100 healthy volunteers randomly assigned in a ratio of 3:1, i.e. 75% of them received the ARCT-154 vaccine and 25% received a placebo. The primary objective of the phase one trial was to assess safety and immunogenicity of the vaccine. Volunteers will receive 2 doses of ARCT-154 vaccine or placebo, 28 days apart. Data of the volunteers from the first dose (day 1) to 7 days after the second dose (day 36), will be evaluated by the research team. Phase I report on the safety of the ARCT-154 vaccine was approved by the Ethics Committee on 20 September 2021. Preliminary results show that the ARCT-154 vaccine is safe in healthy volunteers.
==== Rongxian-Weiyuan campaign (late 1932–early 1933) ==== From his Meishan headquarters, Liu concentrated his forces in Rongxian and Weiyuan. Despite the ceasefire, he still did not trust Deng and Tian, fearing their betrayal if he were to fight Liu Xiang, trapping him in a pincer maneuver. To solve this strategic impasse, Liu proposed a strategic withdrawal: the bulk of his army was to retreat from northern Sichuan into Shaanxi and Gansu, only to attack Deng and Tian from the north. However, due to a combination of poor winter weather and his officers' unwillingness to attack their Baoding classmates, he was forced to shelve the plan. The campaign has been described as unprecedentedly fierce. Over 5,000 deaths were reported at the twin battles of Jiangjiachang and Laojuntai. Seizing on his momentum, Liu Xiang then convened a conference at Neijiang calling for the unification of Sichuan and the surrender of Liu Wenhui. Liu Wenhui's forces were ultimately defeated when Deng Xihou ordered Tian Songyao to attack them from the rear.
=== Positioning, latch and breast milk drainage === Clinically, proper positioning and latch of infants to the nipple can resolve persistent nipple pain brought by inefficient milk flow and tongue-tie, avoid nipple trauma and fissure, prevent breast mastitis and allow efficient wound healing. Mothers can place the nipple asymmetrically in the top half of the infant's mouth. On the other hand, the continuation of effective and frequent breast milk drainage, especially draining the first milk production after childbirth called colostrum, can prevent the development of mastitis and engorgement. Common practices include manual expression, pumping and pressure-relief of the areola. Tools such as effective breast pumps and lubricants can be used to achieve the goal of successful draining and prevent the blockage of milk ducts. In addition, moderating the oversupply and the rapid flow of breast milk can effectively ameliorate painful feelings. If the pain is so severe that the drainage cannot be carried out, painkillers such as ibuprofen can be taken to minimize nipple ache for successful lactation.
The above explanation is merely a simple introduction to vacuum pumping, and is not representative of the entire range of pumps in use. Many variations of the positive displacement pump have been developed, and many other pump designs rely on fundamentally different principles. Momentum transfer pumps, which bear some similarities to dynamic pumps used at higher pressures, can achieve much higher quality vacuums than positive displacement pumps. Entrapment pumps can capture gases in a solid or absorbed state, often with no moving parts, no seals and no vibration. None of these pumps are universal; each type has important performance limitations. They all share a difficulty in pumping low molecular weight gases, especially hydrogen, helium, and neon. The lowest pressure that can be attained in a system is also dependent on many things other than the nature of the pumps. Multiple pumps may be connected in series, called stages, to achieve higher vacuums. The choice of seals, chamber geometry, materials, and pump-down procedures will all have an impact. Collectively, these are called vacuum technique. And sometimes, the final pressure is not the only relevant characteristic. Pumping systems differ in oil contamination, vibration, preferential pumping of certain gases, pump-down speeds, intermittent duty cycle, reliability, or tolerance to high leakage rates. In ultra high vacuum systems, some very "odd" leakage paths and outgassing sources must be considered.
Sources: en.wikipedia.org
Semen is typically translucent with white, grey or even yellowish tint, with a viscous consistency similar to that of egg whites. Blood in the semen can cause a pink or reddish colour, known as hematospermia, and may indicate a medical problem which should be evaluated by a doctor if the symptom persists. After ejaculation, the latter part of the ejaculated semen coagulates immediately, forming globules, while the earlier part of the ejaculate typically does not. After a period typically ranging from 15 to 30 minutes, prostate-specific antigen present in the semen causes the decoagulation of the seminal coagulum. It is postulated that the initial clotting helps keep the semen in the vagina, while liquefaction frees the sperm to make their journey to the ova. A 2005 review found that the average reported viscosity of human semen in the literature was 3–7 centipoises (cP), or, equivalently, millipascal-seconds (mPa·s).
The cycle is present in microorganisms that cause disease but is absent in mammals, for example humans. There is a strong plausibility of the development of antibiotics that would attack the glyoxylate cycle, which would kill the disease-causing microorganisms that depend on the cycle for their survival, yet would not harm humans where the cycle, and thus the enzymes that the antibiotic would target, are absent.
Dimethyl trisulfide (DMTS) is an organic chemical compound and the simplest organic trisulfide, with the chemical formula CH3SSSCH3. It is a flammable liquid with a foul odor, which is detectable at levels as low as 1 part per trillion.
== Discovery == R7 was synthesized by the same researchers who were involved in the discovery of tropoflavin. A patent was filed for R7 in 2013 and was published in 2015. In 2016, it was reported to be in the preclinical stage of development. R7 was superseded by R13 because while R7 had a good drug profile in animals, it showed almost no conversion into tropoflavin in human liver microsomes. Tropoflavin, a naturally occurring flavonoid, was found to act as an agonist of the TrkB with nanomolar affinity (Kd ≈ 320 nM). Due to the presence of a vulnerable catechol group on its 2-phenyl-4H-chromene ring, tropoflavin is extensively conjugated via glucuronidation, sulfation, and methylation during first-pass metabolism in the liver and has a poor oral bioavailability of only 5% in mice upon oral administration. As such, tropoflavin itself is a poor candidate for clinical development as an oral medication. R7 is a derivative of tropoflavin with carbamate moieties on its hydroxyl groups, thereby protecting it from metabolism.
A neurotransmitter is a signaling molecule secreted by a neuron to affect another cell across a synapse. The cell receiving the signal, or target cell, may be another neuron, but could also be a gland or muscle cell. Neurotransmitters are released from synaptic vesicles into the synaptic cleft where they are able to interact with neurotransmitter receptors on the target cell. Some neurotransmitters are also stored in large dense core vesicles. The neurotransmitter's effect on the target cell is determined by the receptor it binds to. Many neurotransmitters are synthesized from simple and plentiful precursors such as amino acids, which are readily available and often require a small number of biosynthetic steps for conversion. Neurotransmitters are essential to the function of complex neural systems. The exact number of unique neurotransmitters in humans is unknown, but more than 100 have been identified. Common neurotransmitters include glutamate, GABA, acetylcholine, glycine, dopamine and norepinephrine.
Sources: en.wikipedia.org
Turin developed as a Fordist city in the early 20th century, which meant a shift from a service-based economy to an industry-based one. In the vein of many Fordist economies Turin's economy relies heavily upon its automotive and aerospace industries. Despite the general decline of the automotive industry since the oil crisis of 1973, the city still relies heavily upon its automotive industry. Since before the Second World War, the automotive industry has been the largest employer in the city, and almost all exports from Turin are manufactured goods. The city serves as the headquarters to Fiat (Fabbrica Italiana Automobili Torino; Turin Italian Automobiles Factory), which has since been absorbed by its parent company, the Fiat Chrysler Automobiles group (now Stellantis) headquartered in Amsterdam, the eighth largest automotive company in the world. Turin is still home to a sizeable Fiat factory. From the 1980s, Turin diversified its economy and is shifting back towards a service economy. Tech and innovation industries are booming in Turin, which was ranked third in number of innovative startups and firms in the information-tech sector, and has some of the most patent applications to the European Patent Office of any city. In 2008 the city generated a GDP of $68 billion, ranking as the world's 78th richest city by purchasing power, and 16th in Europe, according to PricewaterhouseCoopers. Turin accounts for 8 percent of Italy's GDP. The city has been ranked in 2010 by Globalization and World Cities Research Network as a Gamma-level city.
=== 18 January === Australian defence minister Richard Marles stated that Australian soldiers would be deployed in the UK to train Ukrainian soldiers in "infantry tactics in an urban, wooded and basic" settings.
Operation LabScam was a United States government investigation in the 1990s by a seven-member taskforce into laboratory billing fraud resulting in $800 million in fines. Fraudulent billing practices included labs billing Medicare and other government healthcare programs for medically unnecessary tests, upcoded tests, tests that were never conducted, and providing kickbacks to physicians. The following labs were implicated: Damon Clinical Laboratories, SmithKline Beecham Clinical Laboratories (SBCL), Corning Life Sciences, Liberty Testing Laboratory.
The most intense 'peak' is reached within a minute or so and lasts for 1–5 minutes, followed by a gradual tapering off. At 5–10 minutes, less intense yet still noticeable effects typically persist, giving way to a returning sense of the everyday and familiar until back to baseline after about 15 to 20 minutes.
== Research == In 2024, deupsilocin received a breakthrough therapy designation from the U.S. FDA and was in phase 3 clinical trials for major depressive disorder and is in the preclinical stage of development for alcoholism and other psychiatric disorders. Two phase 3 clinical trials for major depressive disorder are being initiated in November 2024 and February 2025. The drug is under development by Helus Pharma (formerly Cybin).
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. Cardarine is a PPARδ agonist, while selective androgen receptor modulators act on androgen receptors. The two classes differ in receptor target and downstream effects.