The short version of Prohibited substance fits in a sentence. The long version — which is the one that helps — is below.
Reviewed 2026-03-27. Anything still debated is marked as such rather than presented as settled.
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.
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 a ligand for PPAR delta, a nuclear receptor that regulates transcription of genes involved in fatty acid oxidation and energy use. Activation of this receptor in skeletal muscle shifts metabolism toward fat burning in animal models. The compound does not burn fat directly; it changes gene expression over hours to days. Researchers study it to understand metabolic flexibility and exercise adaptation. Effects observed in rodents are not automatically expected in humans.
Preclinical research reported that GW501516 increased running endurance in mice and improved lipid profiles in some animal species. Early human trials explored effects on high-density lipoprotein cholesterol, triglycerides, and glucose handling, but the program was discontinued. Published human data are sparse and do not establish efficacy for any condition. Studies also examined PPAR delta in cancer biology, with conflicting findings across models. The relationship between receptor activation, tissue context, and disease risk remains an active area of investigation.
| 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 |
Regulatory treatment of cardarine differs by context and jurisdiction. In competitive sport, the World Anti-Doping Agency lists PPARδ agonists, including GW501516, as prohibited at all times. Outside sport, it lacks approval as a prescription medicine in major drug markets, and products sold for human consumption may be treated as unapproved drugs. Some countries also restrict importation or sale through general consumer protection and medicines laws. These classifications affect availability, testing, and legal risk without establishing therapeutic value.
Because cardarine is not an approved medicine, no pharmacopeial monograph defines its identity, purity, or storage requirements. Laboratories typically rely on in-house methods and reference standards when testing materials labeled as GW501516. Certificates of analysis may report purity and identity for a specific batch, but their scope varies and they do not guarantee safety or legal status. Independent verification can include high-performance liquid chromatography, mass spectrometry, nuclear magnetic resonance, and elemental analysis. The distinction between research chemical labeling and human use is significant because quality standards and oversight differ.
Cardarine can be detected in biological samples and product materials using liquid chromatography coupled to tandem mass spectrometry (LC-MS/MS). The method separates compounds by chromatography and identifies them by mass-to-charge transitions, allowing low-level detection in urine or blood. Sample preparation often involves enzymatic hydrolysis, solid-phase extraction, or protein precipitation. Certified reference materials and isotope-labeled internal standards improve quantification. Detection windows depend on metabolism, matrix, and assay sensitivity, so no single universal window applies.
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.
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.
Published literature on cardarine includes in vitro assays, rodent experiments, and a small number of human studies. Reports describe effects on exercise capacity and lipid metabolism in animals, while human evidence is sparse. Many online descriptions present the compound as a proven endurance aid, a claim not supported by regulatory approval or large clinical trials. Analytical studies focus on identifying the parent compound and its metabolites in biological samples. Important uncertainties include species differences, dose-response relationships, and the relevance of rodent tumor findings to humans.
Cardarine is the common name for GW501516, a synthetic compound studied as a peroxisome proliferator-activated receptor delta agonist. Researchers developed it to explore treatments for lipid disorders and metabolic conditions. It is not an approved medicine in any country. Early clinical work examined changes in HDL cholesterol and triglycerides, but development was discontinued after animal studies raised concerns about cancer. The compound remains available as a research chemical and appears in discussions of performance enhancement.
=== Synthetic hydrogel dressings === Synthetic hydrogel dressings may be derived from synthetic polymers such as polyvinyl alcohol (PVA), poly(ethylene glycol) (PEG), polyurethane (PU), and poly(lactide-co-glycolide) (PLGA). Synthetic hydrogel dressings may also be formed from designer peptides. Researchers are applying 3D printing to the synthesis of hydrogel dressings.
== Fare == Their menu included at least 18 varieties of pizza, along with various other foods. When it was based in Scottsdale, the chain had 112 restaurants open or under development in Arizona, Alabama, California, Utah, Oregon, Washington, Idaho, Florida, Mississippi, North Carolina, Tennessee, Ohio and New Mexico, and Puerto Rico.
=== The telomerase complex === The full human telomerase complex (the holoenzyme) consists of: one copy each of telomerase RNA (TR or TERC, 452 nucleotides), TERT, and TCAB1, plus two copies of the H/ACA ribonucleoprotein subcomplex. The H/ACA subcomplex consists of two copies each of dyskerin (DKC1), NHP2, NOP10 and GAR1. Each copy of the H/ACA subcomplex binds to a hairpin structure on the telomerase RNA, a feature specific to vertebrates. There is also a histone H2A-H2B dimer wrapping around the telomeric DNA as it operates and its presence is essential for the functioning of the telomerase complex. The presence of TPP1 and POT1 is not detected in the cryo-EM study, but based on previous studies they should be attached to TERT's TEN domain in a way analogous to p50 and Teb1 of Tetrahymena. Previous experiments on catalytically active complex extracted from immortal cells indicated two molecules each of human TERT, telomerase RNA, and dyskerin (DKC1). For comparison, the Tetrahymena telomerase complex consists of: one copy each of TR (TER), TERT, p65 in the core; one copy of p50 (homolog of human TPP1) as the connection to the rest of the structure; one copy each of Teb1 (paralogous to human RPA70), Teb2, and Teb3 (altogether a RPA-like complex); and one copy each of p75, p45, p19 (a CST complex).
Sources: en.wikipedia.org
=== Cushing's Disease === Corticotropic cells can have detrimental effects on the body if they express too much or too little ACTH. One such example is Cushing's disease, which can result from overproduction of ACTH in the corticotropes due to pituitary tumors known as corticotroph adenomas; this is the cause for roughly two-thirds of those diagnosed with Cushing's disease. It is also possible that this disease can result from production of ACTH in a non-pituitary tumor, known as ectopic production, or the adrenal glands can overproduce cortisol due to an adrenal tumor. This overproduction of ACTH causes an increase in cortisol levels due to increased glucocorticoid synthesis in the adrenal cortex resulting in several associated symptoms. Symptoms of Cushing's disease include:
== Further reading == Breslau-Siderius, E. J.; et al. (1998). "Brack syndrome: a rare combination of bone fragility and multiple congenital joint contractures". Journal of Pediatric Orthopaedics B. 7 (1): 35–38. doi:10.1097/01202412-199801000-00006.
=== Youth levels === Townsend represented England at under-16, under-17 and under-19 level. He played three times for the under-16s between 2006 and 2007, making his debut in a 1–1 draw away with Wales on 20 October 2006 and his last appearance in a 2–0 away loss to Germany in April 2007. He scored twice on his under-17 debut, in a 6–1 win over Northern Ireland in August 2007, and went on to make six appearances, the last in a 0–0 draw with Portugal on 5 February 2008. Townsend's first two appearances at under-19 level came in the group stage of the 2009 European Championship; he was an unused substitute in the final, which England lost to Ukraine. He played four times in 2010, once as a starter in a friendly, and three times as a substitute in qualifiers for the 2010 competition. Townsend received his first call up to the England under-21 team in October 2012 for the Euro 2013 play-off matches against Serbia. He made his debut in the first leg as a 65th-minute substitute for Liverpool's Raheem Sterling. He also played in two U21 friendlies, in 2012 and 2013. In May 2013, Townsend was charged by The Football Association over alleged breaches of its rules on betting. He subsequently voluntarily withdrew from England's squad for the upcoming European Under-21 Championship finals. He later admitted to charges under the FA's rules for breaching football betting regulations. After a personal hearing, he was fined £18,000 and suspended for four months backdated to 23 May, with three months suspended until 1 July 2016.
== Uses == Because of their amphiphilic structures, the polymers have surfactant properties that make them useful in industrial applications. Among other things, they can be used to increase the water solubility of hydrophobic, oily substances or otherwise increase the miscibility of two substances with different hydrophobicities. For this reason, these polymers are commonly used in industrial applications, cosmetics, and pharmaceuticals. They have also been evaluated for various drug delivery applications and were shown to sensitize drug-resistant cancers to chemotherapy. In bioprocess applications, poloxamers are used in cell culture media for their cell cushioning effects because their addition leads to less stressful shear conditions for cells in reactors. There are grades of poloxamers commercially available specifically for cell culture, including Kolliphor P 188 Bio. In materials science, the poloxamer P123 has recently been used in the synthesis of mesoporous materials, including SBA-15. In colloidal science, certain poloxamers such as Pluronic F-108 or Pluronic F-127, are used as steric stabilizers to prevent coalescence and/or reduce aggregation. In the case of hydrophobic colloids, the poloxamer's interior hydrophobic block is absorbed into the colloid while the two hydrophilic tails remain suspended in solution, creating a steric barrier. When mixed with water, concentrated solutions of poloxamers can form hydrogels. These gels can be extruded easily, acting as a carrier for other particles, and used for robocasting.
Sources: en.wikipedia.org
On 23 January 2026, Danish prime minister Mette Frederiksen visited Greenland to express support for the people and the island's self-governing government, following comments by US president Donald Trump indicating his willingness to annex the territory. Trump had previously discussed strengthening security in the Arctic region with NATO secretary general Mark Rutte. Both the Danish and Greenlandic governments have affirmed that the island's sovereignty is indisputable, but remain open to discussions on issues such as security and economic development. The crisis eased after Trump withdrew threats of force and new tariffs.
On 31 December 2021, in a speech, al-Burhan said he was committed to "building all the institutions of transitional government and holding free, fair, and transparent elections at their scheduled time", in July 2023. Both al-Burhan and Hemedti had ties to Vladimir Putin's government in Russia. According to Business Insider, "The two generals helped Russian President Vladimir Putin exploit Sudan's gold resources to help buttress Russian finances against Western sanctions and fund his war in Ukraine." On 9 February 2023, al-Burhan met with Russian Foreign Minister Sergey Lavrov. On 2 January 2022, Abdalla Hamdok resigned from his post of prime minister and Osman Hussein was sworn in as acting prime minister. On 4 July 2022, it was reported that al-Burhan mentioned the army will withdraw from the ongoing political talks and will allow political and revolutionary groups to form a transitional civilian government. This statement followed recent pro-democracy protests where 117 people were killed. On 10 November 2023, al-Burhan condemned Israel's actions in the Gaza Strip during the Gaza war, saying that "We declare our full solidarity with the Palestinian people and their right to establish their legitimate state on the 1967 borders." On 16 January 2025, the U.S. Treasury Department imposed sanctions on al-Burhan. According to sources the reasons were: "targeting of civilians and civilian infrastructure and denial of aid access, as well as refusal to participate in peace talks".
Navy shore bombardment and submarine operations. The Japanese increased their garrison in the north Kurils from 8,000 in 1943 to 41,000 in 1944 and maintained more than 400 aircraft in the Kurils and Hokkaido area in anticipation that the Americans might invade from Alaska.
In molecular biology, the BtpA protein family is a family of proteins which includes BtpA. BtpA appears to play a role in the stabilisation of photosystem I. It is an extrinsic membrane protein located on the cytoplasmic side of the thylakoid membrane. Homologs of BtpA are found in the Thermoproteota and "Euryarchaeota", where their function remains unknown. The Ycf4 protein is firmly associated with the thylakoid membrane, presumably through a transmembrane domain. Ycf4 co-fractionates with a protein complex larger than PSI upon sucrose density gradient centrifugation of solubilised thylakoids. The Ycf3 protein is loosely associated with the thylakoid membrane and can be released from the membrane with sodium carbonate. This suggests that Ycf3 is not part of a stable complex and that it probably interacts transiently with its partners. Ycf3 contains a number of tetratricopeptide repeats (TPR); TPR is a structural motif present in a wide range of proteins, which mediates protein-protein interactions.
== External links == Table of radioactive isotopes, K-40 The Lund/LBNL Nuclear Data Search Potassium-40 Section, Radiological and Chemical Fact Sheets to Support Health Risk Analyses for Contaminated Areas
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.
It binds to and activates PPAR delta, a nuclear receptor that controls expression of genes related to fatty acid oxidation. This mechanism can alter energy metabolism in animal models. It is not a direct stimulant or fat-burning enzyme.