Everything below concerns WADA Prohibited List. We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Last reviewed on 2026-04-21. Where a claim depends on a specific study, the study is described rather than over-claimed.
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.
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.
A persistent misconception is that cardarine is a fat-burning drug or a safe alternative to anabolic steroids. No approved therapeutic product exists, and human safety data are limited. The tumor findings in rodents remain a central concern in scientific reviews. Products sold online may contain inaccurate labels, impurities, or different compounds entirely, which complicates any assessment of effects. Independent testing of such products has reported frequent mislabeling. For these reasons, discussions in the literature emphasize risks and unknowns rather than benefits.
Cardarine is not approved for human therapeutic use in any major jurisdiction. It appears on the World Anti-Doping Agency Prohibited List as a PPARδ agonist within the hormone and metabolic modulators category. Sports organizations test for it because it has been detected in athlete samples and seized products. Regulatory actions against marketed research chemical versions have occurred in several countries, though enforcement varies. Availability through unregulated channels complicates oversight.
Analytical laboratories typically identify cardarine and its metabolites using liquid chromatography-tandem mass spectrometry. Urine is a common matrix in anti-doping testing, while blood and tissue may be used in research settings. Detection windows depend on the assay, the sample matrix, and the compound's metabolism. Because cardarine is extensively metabolized, laboratories often target specific metabolites to improve sensitivity and confirmation. Reference standards are required for reliable quantification. Method validation includes checks for selectivity, linearity, and carryover.
| 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. |
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.
Anti-doping laboratories identify GW501516 and its metabolites using liquid chromatography-tandem mass spectrometry. Urine is the usual matrix, and detection can occur after the parent compound has cleared from blood. The exact detection window depends on dose, formulation, individual metabolism, and assay sensitivity. Because the compound is prohibited at all times, athletes are subject to testing in and out of competition. Analytical methods continue to improve as new metabolites and designer analogs are characterized.
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.
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.
At the molecular level, GW501516 binds and activates PPARδ, a nuclear receptor that regulates transcription. Activation shifts expression of genes involved in fatty acid oxidation, energy expenditure, and lipid transport in skeletal muscle and liver. Animal studies report increased endurance and altered lipid profiles after exposure. Human data are limited to small trials and do not establish long-term safety or efficacy. PPARδ also has roles in cell proliferation, so the relationship between activation and cancer risk remains an open question.
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.
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.
== Background == The human immune system relies on antibodies; these are specialized proteins produced by B cells in response to the presence of antigens. Antigens are typically foreign molecules that are parts of bacteria, viruses, or other pathogens that trigger an immune response. Antibodies bind to these antigens to neutralize them, block their activity, or mark them for destruction by other immune system cells. The immune system fails to distinguish between self and non-self, a process called immune tolerance. In normal conditions, the immune system is trained to recognize the body's cells or proteins and is labeled as "self" while identifying harmful substances as "non-self". This causes it to produce autoantibodies that target the body's own healthy tissues. Autoantibodies can cause inflammation, tissue damage, and contribute to the progression of various chronic diseases. Some people may inherit genes that increase their risk of developing autoimmune disease, while other triggers such as viral infections or immune system stressors may add to the loss of immune tolerance. When this happens, the immune system starts to recognize some of the body's own proteins as foreign and produces antibodies to fight against them. Anti-U1 RNP antibodies are one example. However, not everyone who inherits genetic risk will develop a disease. Many factors can work together before the immune system begins attacking the body's own tissues.
where aij is the number of atoms of element i in molecule j and b0i is the total number of atoms of element i, which is a constant, since the system is closed. If there are a total of k types of atoms in the system, then there will be k such equations. If ions are involved, an additional row is added to the aij matrix specifying the respective charge on each molecule which will sum to zero. This is a standard problem in optimisation, known as constrained minimisation. The most common method of solving it is using the method of Lagrange multipliers (although other methods may be used). Define:
"Chordate". The Encyclopedia of Life. Chordate on GlobalTwitcher.com Chordate node at Tree Of Life Archived 24 February 2007 at the Wayback Machine Chordate node at NCBI Taxonomy Archived 28 April 2021 at the Wayback Machine
=== Respired gas monitor === Mass spectrometers were used in hospitals for respiratory gas analysis beginning around 1975 through the end of the century. Some are probably still in use but none are currently being manufactured. Found mostly in the operating room, they were a part of a complex system, in which respired gas samples from patients undergoing anesthesia were drawn into the instrument through a valve mechanism designed to sequentially connect up to 32 rooms to the mass spectrometer. A computer directed all operations of the system. The data collected from the mass spectrometer was delivered to the individual rooms for the anesthesiologist to use. The uniqueness of this magnetic sector mass spectrometer may have been the fact that a plane of detectors, each purposely positioned to collect all of the ion species expected to be in the samples, allowed the instrument to simultaneously report all of the gases respired by the patient. Although the mass range was limited to slightly over 120 u, fragmentation of some of the heavier molecules negated the need for a higher detection limit.
The main objective of food refrigeration and/or freezing is to preserve the quality and safety of food materials. Refrigeration and freezing contribute to the preservation of perishable foods, and to the conservation of some food quality factors, such as visual appearance, texture, taste, flavor and nutritional content. Freezing food slows the growth of bacteria that could potentially harm consumers.
Sources: en.wikipedia.org
Nuclides (or nucleides, from nucleus; also known as nuclear species) are a class of atoms characterized by their number of protons, Z, their number of neutrons, N, and their nuclear energy state. The word nuclide was coined by the American nuclear physicist Truman P. Kohman in 1947. Kohman defined nuclide as a "species of atom characterized by the constitution of its nucleus" containing a certain number of neutrons and protons. The term thus originally focused on the nucleus.
In an interview, Taub commented that his visit was proof that "the people of Bradford [have] sent a clear message that George Galloway does not represent them." Galloway told a reporter from the BuzzFeed website: "As has just been proved, I cannot make Bradford an Israel-free zone, but I am certain that the Israeli ambassador was not welcome." Galloway accused the councillors who had invited the ambassador of fraternising with a "mouthpiece for murder". West Yorkshire Police investigated two complaints to determine if Galloway's words constituted hate speech (British law prohibits discrimination based on nationality). Galloway was questioned under caution by the police and the matter was referred to the Crown Prosecution Service. Galloway subsequently criticised the police investigation, describing it as "an absolute and despicable attempt to curb my freedom of speech". In October 2014, it emerged that Galloway would not be prosecuted for his comments on the grounds of "insufficient evidence", although West Yorkshire Police had "recorded this matter as a hate incident." On 29 August 2014, Galloway was assaulted in Notting Hill by Neil Masterson, a convert to Judaism, and suffered a bruised rib and severe bruising on his head and face and was hospitalised overnight. Masterson was charged with religiously aggravated assault and sentenced to 16 months in prison. Released from prison in September 2015, he soon returned to jail for a month after breaking a restraining order forbidding him from contacting Galloway. Masterson was also fined for harassment.
== Education == McAlpine was awarded an honours bachelor's degree at Western University where she won a gold medal in zoology. She received a master's degree from the University of Toronto in 1966. Her thesis was called An assessment of the creatine kinase test in the detection of carriers of Duchenne muscular dystrophy. She went on to complete a PhD at University College London in 1970 with a thesis entitled Studies on the genetic variation of phosphoglucomutase in man. McAlpine was mentored and supervised by women in her field throughout her education. Her undergraduate work was performed under Helen Battle, and Margaret Thompson was her advisor in Toronto. Her PhD supervisor was Harry Harris.
== Cast == Joseph Wairimu as Mwas Olwenya Maina as Oti Nancy Wanjiku Karanja as Amina Mugambi Nthiga as Cedric Paul Ogola as Mose Antony Ndung'u as Waf Johnson Gitau Chege as Kyalo Kamau Ndungu as John Waya Abubakar Mwenda as Dingo Mburu Kimani as Daddy M Mehul Savani as Khanji Maina Joseph as Kimachia Shix Kapienga Jacky Vike as Ruth
Sources: en.wikipedia.org
IGOs are established by a treaty that acts as a charter creating the group. Treaties are formed when lawful representatives (governments) of several states go through a ratification process, providing the IGO with an international legal personality. Intergovernmental organizations are an important aspect of public international law. Intergovernmental organizations in a legal sense should be distinguished from simple groupings or coalitions of states, such as the G7 or the Quartet. Such groups or associations have not been founded by a constituent document and exist only as task groups. Intergovernmental organizations must also be distinguished from treaties. Many treaties (such as the North American Free Trade Agreement, or the General Agreement on Tariffs and Trade before the establishment of the World Trade Organization) do not establish an independent secretariat and instead rely on the parties for their administration, for example by setting up a joint committee. Other treaties have established an administrative apparatus which was not deemed to have been granted binding legal authority. The broader concept wherein relations among three or more states are organized according to certain principles they hold in common is multilateralism.
=== Articles === Rosen, DR; Siddique, T; Patterson, D; Figlewicz, DA; Sapp, P; Hentati, A; Donaldson, D; Goto, J; O'Regan, JP; Deng, HX; et al. (1993). "Mutations in Cu/Zn superoxide dismutase gene are associated with familial amyotrophic lateral sclerosis". Nature. 364 (6435): 362. Bibcode:1993Natur.364..362R. doi:10.1038/364362c0. PMID 8332197. Gusella, JF; Wexler, NS; Conneally, PM; Naylor, SL; Anderson, MA; Tanzi, RE; Watkins, PC; Ottina, K; Wallace, MR; Sakaguchi, AY; Young, AB; Shoulson, I; Bonilla, E; Martin, JB (1983). "A polymorphic DNA marker genetically linked to Huntington's Disease". Nature. 306 (5940): 234–238. Bibcode:1983Natur.306..234G. doi:10.1038/306234a0. PMID 6316146. S2CID 4320711. Tanzi, RE; Gusella, JF; Watkins, PC; Bruns, GAP; St; George-Hyslop, PH; Van Keuren, ML; Patterson, D; Pagan, S; Kurnit, DM; Neve, RL. (1987). "The amyloid beta protein gene: cDNA cloning, mRNA distribution, and genetic linkage near the Alzheimer locus". Science. 235 (4791): 880–884. Bibcode:1987Sci...235..880T. doi:10.1126/science.2949367. PMID 2949367. Tanzi, RE; McClatchey, AI; Lamperti, ED; V-Komaroff, L; Gusella, JF; Neve, R (1988). "Protease inhibitor domain encoded by an amyloid protein precursor mRNA associated with Alzheimer's disease". Nature. 331 (6156): 528–530. Bibcode:1988Natur.331..528T. doi:10.1038/331528a0. PMID 2893290. S2CID 4277294.
== The TCR complex == In the plasma membrane the TCR receptor chains α and β associate with six additional adaptor proteins to form an octameric complex. The complex contains both α and β chains, forming the ligand-binding site, and the signaling modules CD3δ, CD3γ, CD3ε and CD3ζ in the stoichiometry TCR α β - CD3εγ - CD3εδ - CD3ζζ. Charged residues in the transmembrane domain of each subunit form polar interactions allowing a correct and stable assembly of the complex. The cytoplasmic tail of the TCR is very short, hence the CD3 adaptor proteins containing the signaling motifs are needed for propagating the signal from the triggered TCR into the cell. The signaling motifs involved in TCR signaling are tyrosine residues in the cytoplasmic tail of these adaptor proteins that can be phosphorylated in the event of TCR-pMHC binding. The tyrosine residues reside in a specific amino acid sequence of the signature Yxx(L/I)x6-8Yxx(L/I), where Y, L, I indicate tyrosine, leucine and isoleucine residues, x denotes any amino acids, the subscript 6-8 indicates a sequence of 6 to 8 amino acids in length. This motif is very common in activator receptors of the non-catalytic tyrosine-phosphorylated receptor (NTR) family and is referred to as immunoreceptor tyrosine-based activation motif (ITAM). CD3δ, CD3γ and CD3ε each contain a single ITAM, while CD3ζ contains three ITAMs. In total the TCR complex contains 10 ITAMs. Phosphorylated ITAMs act as binding site for SH2-domains of additionally recruited proteins.
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 has not received approval for human therapeutic use in major jurisdictions. It remains an investigational compound.