research chemical raises a handful of sensible questions. This page answers them in order, starting with the fundamentals and moving to applications.
Reviewed 2025-11-28. Anything still debated is marked as such rather than presented as settled.
GW501516 binds and activates PPARδ, a nuclear receptor that influences transcription of genes involved in fatty acid oxidation and energy use. Activation shifts some metabolic pathways in preclinical models, which is why the compound has been studied for lipid disorders and exercise-related endpoints. The exact downstream effects in humans are incompletely mapped. PPARδ is expressed in many tissues, including skeletal muscle, liver, and adipose tissue, so broad activation may have varied consequences. Researchers continue to examine how selective or partial activation might alter the balance between benefits and risks.
Published human data are sparse and mostly come from early-phase trials. Those studies examined short-term changes in lipids, glucose, and exercise capacity, but they were not large enough to establish efficacy or long-term safety. Some animal experiments reported increased running endurance, yet such findings do not prove a performance benefit in people. Anti-doping laboratories detect GW501516 and its metabolites in urine or blood using liquid chromatography-tandem mass spectrometry. Detection windows depend on dose, sample type, and individual metabolism. The method is sensitive enough to identify trace residues in tested samples.
Laboratory handling focuses on identity, purity, and stability. Reference standards are typically stored cold and dry, protected from light, because solutions can degrade over time. Analytical checks may use high-performance liquid chromatography with ultraviolet detection or mass spectrometry. Impurities and related substances can be separated chromatographically and compared with a known standard. Because cardarine is not an approved drug, compendial monographs are absent, and laboratories often rely on in-house methods. Reported purity varies among unregulated products and should not be assumed from a label.
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.
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.
| Property | Value | Notes |
|---|---|---|
| Appearance | White to off-white solid | Typical form of reference material |
| Solubility | Low in water; soluble in DMSO | Used to prepare stock solutions |
| Typical storage | -20 °C, desiccated, protected from light | Common laboratory practice |
| Analytical method | LC-MS/MS | Detects parent compound and metabolites |
| Common test matrix | Urine or blood | Used in anti-doping analysis |
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.
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.
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.
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.
Unprovoked venous thrombosis may be related to inherited thrombophilias (e.g., factor V Leiden, antithrombin deficiency, and various other genetic deficiencies or variants), particularly in younger patients with family history of thrombosis; however, thrombotic events are more likely when acquired risk factors are superimposed on the inherited state.
=== Injury === The clinically important layer is the aponeurosis. Scalp lacerations through this layer mean that the "anchoring" of the superficial layers is lost and gaping of the wound occurs which would require suturing. This can be achieved with simple or vertical mattress sutures using a non-absorbable material, which are subsequently removed at around days 7–10.
Ionic flow in action potentials at Blackwell Publishing Action potential propagation in myelinated and unmyelinated axons at Blackwell Publishing Generation of AP in cardiac cells and generation of AP in neuron cells Resting membrane potential from Life: The Science of Biology, by WK Purves, D Sadava, GH Orians, and HC Heller, 8th edition, New York: WH Freeman, ISBN 978-0-7167-7671-0. Ionic motion and the Goldman voltage for arbitrary ionic concentrations at The University of Arizona A cartoon illustrating the action potential Action potential propagation Open-source software to simulate neuronal and cardiac action potentials at SourceForge.net Introduction to the Action Potential, Neuroscience Online (electronic neuroscience textbook by UT Houston Medical School) Khan Academy: Electrotonic and action potential Archived 2 July 2014 at the Wayback Machine
There were larger dinosaurs, but knowledge of them is based entirely on a small number of fragmentary fossils. Most of the largest herbivorous specimens on record were discovered in the 1970s or later, and include the massive Argentinosaurus, which may have weighed 80000 to 100000 kilograms (88 to 110 short tons) and reached lengths of 30 to 40 meters (98 to 131 ft); some of the longest were the 33.5-meter (110 ft) long Diplodocus hallorum (formerly Seismosaurus), the 33-to-34-meter (108 to 112 ft) long Supersaurus, and 37-meter (121 ft) long Patagotitan; and the tallest, the 18-meter (59 ft) tall Sauroposeidon, which could have reached a sixth-floor window. There were a few dinosaurs that were considered either the heaviest or longest. The most famous include Amphicoelias fragillimus, known only from a now lost partial vertebral neural arch described in 1878. Extrapolating from the illustration of this bone, the animal may have been 58 meters (190 ft) long and weighed 122400 kg (269800 lb). However, recent research has reclassified Amphicoelias from the long, gracile diplodocid to the shorter but much stockier rebbachisaurid. Now renamed as Maraapunisaurus, this sauropod measured as much as 40 meters (130 ft) long and weighed as much as 120000 kg (260000 lb). Another contender of this title includes Bruhathkayosaurus, a controversial taxon that was recently confirmed to exist after archived photos were uncovered. Bruhathkayosaurus was a titanosaur and would have most likely weighed more than even Maraapunisaurus.
Sources: en.wikipedia.org
By 1818, the United States Navy had outlined that each sailor was to be given 14 ounces (400 g) of bread per day as part of their daily ration while serving onboard in the form of hardtack. The procurement of these stores was the responsibility of the ship's Purser, and was not strictly outlined by the Board of Navy Commissioners. During the American Civil War (1861–1865), three-by-three-inch (7.6 by 7.6 cm) hardtack was shipped from Union and Confederate storehouses. Civil War soldiers generally found their rations to be unappealing; hardtack's ability to host worms earned it the "worm castles" nickname, and soldiers joked about the poor quality of the hardtack in the satirical song "Hard Tack Come Again No More". The song was sung to the tune of the Stephen Foster song "Hard Times Come Again No More", and featured lyrics describing the hardtack rations as being 'old and very wormy' and causing many 'stomachs sore'. John Billings, a soldier in the 10th Massachusetts Battery, outlines many details on how hardtack was utilized during the war in his book Hard Tack and Coffee.
=== Pharmacokinetics === More than 99% of tazarotenic acid, the active metabolite of tazarotene, in the blood binds to plasma proteins (the most predominant being albumin). The volume of distribution (VD) for tazarotene is 26.1 L/kg and the VD for tazarotenic acid is 1.97 L/kg. Tazarotene is excreted from the body via feces and urine equally, and it has an elimination half-life of 16 to 18 hours.
=== Aisha Ali-Khan libel case === On 20 June 2016, Galloway lost a libel action brought by Aisha Ali-Khan, his assistant for six months in 2012. He had claimed that she had pursued a "dirty tricks" campaign against him and the Respect Party, and had slept at his house with her then-husband. The case was heard in the High Court. His counsel apologised on Galloway's behalf, and accepted that he had made "defamatory accusations". Ali-Khan will receive a "five-figure sum" in damages and her legal costs. As part of the settlement of their libel claim, both Galloway and Ali-Khan gave undertakings not to make any further public statement about the litigation or to defame each other. In 2018 Galloway brought an action that Ali-Khan had breached this undertaking 26 times, which Ali-Khan admitted, and in April 2018 the High Court imprisoned Ali-Khan for 12 weeks for contempt of court, describing her action as "deliberate, flagrant, persistent and inexcusable". Ali-Khan had been found guilty of contempt of court on a previous occasion. Previously, during 2017, Ali-Khan had filed a petition for Galloway's bankruptcy.
=== Buses === Wilmslow's main bus interchange is at Bank Square; it is served by D&G Bus, which provides services to Altrincham, Macclesfield, Manchester Airport and Handforth Dean. There is also a free bus service, between Knutsford and Handforth Dean retail park.
A December 2024 report by Amnesty International found the use of unguided missiles on civilian areas to likely constitute indiscriminate attacks. International humanitarian law states that parties in a conflict must not direct attacks at civilians and must distinguish civilians and civilian infrastructure from military targets.
Sources: en.wikipedia.org
Anti-doping and clinical laboratories commonly use liquid chromatography-tandem mass spectrometry. The method can identify GW501516 and its metabolites in urine or blood. Detection depends on sample timing and the amount present.
PPARδ is a nuclear receptor that regulates genes linked to fatty acid oxidation and energy metabolism. Activation can alter lipid handling and energy use in experimental models. The full range of effects in humans is still under study.
The solid compound is generally stable when kept cold, dry, and protected from light. Solutions may degrade faster, so laboratory protocols often specify fresh preparation or cold storage. Stability can depend on solvent, concentration, and container.
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.