research chemical comes up often in conversation and rarely with the context attached. Here we lay out the basics in order, then work through the practical considerations.
Last reviewed on 2025-09-22. Where a claim depends on a specific study, the study is described rather than over-claimed.
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.
PPARδ is a nuclear receptor that regulates gene expression related to fatty acid oxidation, glucose homeostasis, and mitochondrial function. GW501516 binds to this receptor with high affinity and activates downstream signaling in skeletal muscle and other tissues. Animal studies reported increased endurance and altered fuel preference, but human data remain limited and inconsistent. The precise relationship between receptor activation and observed physiological changes is still an area of active investigation. Researchers have also examined whether the compound affects inflammation or cell proliferation. No approved therapeutic indication exists for cardarine.
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.
| Property | Value | Notes |
|---|---|---|
| Common name | Cardarine | Common internet and media name. |
| Research code | GW501516 | Also written GW-1516. |
| Drug class | PPARδ agonist | Not a selective androgen receptor modulator. |
| Development status | Discontinued | Clinical development halted after rodent cancer findings. |
| Regulatory status | Prohibited in sport | Listed by WADA; not approved as medicine. |
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.
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 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.
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.
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.
* Disputed ** Separated to Maroodi Jeex and Sahil by Somaliland *** Shared by Puntland and Galmudug Northern Somalia is now de facto divided up among the autonomous regions of Puntland (which considers itself an autonomous state), Somaliland (a self-declared, partially-recognised state) and newly established North East State of Somalia. In central Somalia, Galmudug is another regional entity that emerged just south of Puntland. Jubaland in the far south is a fourth autonomous region within the federation. In 2014, a new South West State was likewise established. In April 2015, a formation conference was also launched for a new Hirshabelle State. The Federal Parliament was tasked in 2012 with selecting the ultimate number and boundaries of the autonomous regional states (officially Federal Member States) within the Federal Republic of Somalia.
Classifying Datura as to its species is difficult, and the descriptions of new species often are accepted prematurely. Later, these "new species" are found to be simply varieties that have evolved due to conditions at a specific location. These new designations usually disappear in a few years. Contributing to the confusion is the fact that various species, such as D. wrightii and D. innoxia, are very similar in appearance, and the variation within a species can be extreme. For example, Datura species can change size of plant, leaf and flowers, all depending on location. The same species, when growing in a half-shady, damp location, can develop into a flowering bush 80 cm (30 in) in height, but when growing in a very dry location, will only grow into a thin plant not much more 13 cm (5 in), with tiny flowers and a few miniature leaves. Datura species are native to dry, temperate and subtropical regions. Most species are native to Mexico, which is considered the centre of origin of the genus. Several species are considered to have extra-American native ranges: D. ferox (native to China), D. metel (native to India and Southeast Asia) and D. leichardthii (native to Australia); however, these may be early introductions from Central America.
The management of modafinil overdose involves supportive care, monitoring of vital signs, and treatment of specific complications. In cases of recent consumption, activated charcoal, gastric lavage (stomach pumping), or hemodialysis (blood filtering) may be used. There is no specific antidote for modafinil overdose. The main way to deal with modafinil overdose is supportive care, which includes sedating the patient and stabilizing their blood pressure, and muscle activity in case of manifestations such as agitation or tremor.
=== 7 February === The SAF claimed to have retaken the Traffic Signs and License Plates Factory along with the entire industrial area of Khartoum. They also claimed to have retaken Al-Masoudiya in Khartoum state and Abu Quta in northwestern Gezira State. The SAF claimed to have shot down seven RSF drones over Debba, Northern State. Three people were killed in an RSF attack on the Zamzam IDP camp. Five others were killed in an RSF attack on Saloma, southeast of El Fasher.
Sources: en.wikipedia.org
=== Production and secretion === During pregnancy, the syncytiotrophoblast cells of the placenta produce a polypeptide hormone, human placental lactogen (hPL), also known as human chorionic somatomammotropin (hCS). in six weeks of gestation, production of hPL in maternal plasma is detected, then the concentration of hPL keeps increasing until week 30 of pregnancy. The secretion rate of hPL is one gram per day, which is the highest rate compared to other hormones.
==== Polyfloral ==== Polyfloral honey, also known as wildflower honey, is derived from the nectar of many types of flowers. The taste may vary from year to year, and the aroma and the flavor can be more or less intense, depending on which flowers are blooming.
=== Quality === Semen quality is a measure of the ability of semen to accomplish fertilization. Thus, it is a measure of fertility in a man. It is the sperm in the semen that is the fertile component, and therefore semen quality involves both sperm quantity and sperm quality.
=== Data mining approach === Computer SAR models typically calculate a relatively large number of features. Because those lack structural interpretation ability, the preprocessing steps face a feature selection problem (i.e., which structural features should be interpreted to determine the structure-activity relationship). Feature selection can be accomplished by visual inspection (qualitative selection by a human); by data mining; or by molecule mining. A typical data mining based prediction uses e.g. support vector machines, decision trees, artificial neural networks for inducing a predictive learning model. Molecule mining approaches, a special case of structured data mining approaches, apply a similarity matrix based prediction or an automatic fragmentation scheme into molecular substructures. Furthermore, there exist also approaches using maximum common subgraph searches or graph kernels.
=== 4 February === At least six people were killed by RSF shelling on the al-Nao hospital in Omdurman. The SAF claimed to have retaken al-Kamelin and laid siege to the town of Naima in White Nile State. Engineers from the Khartoum State Water Authority were fired at by RSF snipers stationed at the Kuwaiti building while they were assessing the damage to the Bahri Water Plant.
Sources: en.wikipedia.org
On September 19, 2023, the Subcommittee on Health held a hearing titled "Examining Policies to Improve Seniors’ Access to Innovative Drugs, Medical Devices, and Technology." Dora Hughes, the acting director of the Center for Clinical Standards and Quality at the U.S. Centers for Medicare and Medicaid Services (CMS), defended the proposed Transitional Coverage for Emerging Technologies (TCET) pathway, which aims to restrict coverage for breakthrough medical devices to five reviews a year. Some lawmakers and medtech trade groups called for expanding the pathway to include diagnostics. Various other legislative proposals were discussed during the hearing, including bills related to Medicare coverage, drug pricing, and transparency in healthcare.
==== Lanthipeptides ==== Lanthipeptides are characterized by the presence lanthionine (Lan) and 3-methyllanthionine (MeLan) residues. Lan residues are formed from a thioether bridge between Cys and Ser, while MeLan residues are formed from the linkage of Cys to a Thr residue. The biosynthetic enzymes responsible for Lan and MeLan installation first dehydrate Ser and Thr to dehydroalanine (Dha) and dehydrobutyrine (Dhb), respectively. Subsequent thioether crosslinking occurs through a Michael-type addition by Cys onto Dha or Dhb. Four classes of lanthipeptide biosynthetic enzymes have been designated. Class I lanthipeptides have dedicated lanthipeptide dehydratases, called LanB enzymes, though more specific designations are used for particular lanthipeptides (e.g. NisB is the nisin dehydratase). A separate cyclase, LanC, is responsible for the second step in Lan and MeLan biosynthesis. However, class II, III, and IV lanthipeptides have bifunctional lanthionine synthetases in their gene clusters, meaning a single enzyme carries out both dehydration and cyclization steps. Class II synthetases, designated LanM synthetases, have N-terminal dehydration domains with no sequence homology to other lanthipeptide biosynthetic enzymes; the cyclase domain has homology to LanC. Class III (LanKC) and IV (LanL) enzymes have similar N-terminal lyase and central kinase domains, but diverge in C-terminal cyclization domains: the LanL cyclase domain is homologous to LanC, but the class III enzymes lack Zn-ligand binding domains.
== External links == "ETOH Database Search". hazelden.org. The National Institute on Alcohol Abuse and Alcoholism maintains a database of alcohol-related health effects. ETOH Archival Database (1972–2003) Alcohol and Alcohol Problems Science Database. "Harmful Interactions". National Institute on Alcohol Abuse and Alcoholism (NIAAA). WHO fact sheet on alcohol ChEBI – biology related Kyoto Encyclopedia of Genes and Genomes signal transduction pathway: KEGG – human alcohol addiction
patients with active hepatic disease patients in whom spasticity is utilized to maintain upright posture and balance patients with a hypersensitivity to dantrolene There are no contraindications for intravenous dantrolene used for prophylaxis or management of malignant hyperthermia.
==== In venoms ==== Serotonin is a common component of invertebrate venoms, salivary glands, nervous tissues, and various other tissues, across molluscs, insects, crustaceans, scorpions, various kinds of worms, and jellyfish. Adult Rhodnius prolixus – hematophagous on vertebrates – secrete lipocalins into the wound during feeding. In 2003 these lipocalins were demonstrated to sequester serotonin to prevent vasoconstriction (and possibly coagulation) in the host.
Sources: en.wikipedia.org
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.
Preclinical rodent studies reported cancers, including liver and bladder tumors, at tested doses. The human relevance of those findings is uncertain, but development was discontinued. No approved human product resulted.
No. It remains an investigational compound without approved therapeutic labeling. Sports regulators prohibit its use, and health agencies have warned against consuming it.
Cardarine is a common name for GW501516, a synthetic PPARδ agonist developed for research. It has not been approved as a medication in any country. It is classified as an unapproved drug and a prohibited substance in sport.