metabolite is one of those subjects where the details matter more than the headlines. This page pulls together the background, the mechanisms, and the practical points readers ask about most.
Updated 2025-11-25. Numbers and descriptions here follow the published literature rather than marketing material.
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.
PPARδ is a nuclear receptor that influences transcription of genes involved in fatty acid oxidation, lipid transport, and energy homeostasis. GW501516 binds and activates this receptor with high selectivity relative to PPARα and PPARγ in laboratory assays. Activation alters expression of target genes in skeletal muscle, liver, and adipose tissue in animal models. The exact clinical consequences of these changes in humans remain incompletely characterized, and observed effects in animals do not establish therapeutic benefit or safety.
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.
| Property | Value | Notes |
|---|---|---|
| Chemical class | PPARδ agonist | Not an anabolic steroid. |
| Common synonyms | GW501516, GW-1516 | Cardarine is an informal name. |
| Appearance | White to off-white powder | Typical for research-grade solid. |
| Solubility class | Poorly soluble in water; soluble in some organic solvents | Such as DMSO or ethanol in laboratory settings. |
| Typical storage temperature | Cool, dry, protected from light | Specific conditions vary by supplier and form. |
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.
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.
=== DSF-GTP === The DSF-GTP (GFP-Tagged Protein-of-Interest) technique was developed by a team led by Patrick Schaeffer at James Cook University and published in Moreau et al. 2012. The development of differential scanning fluorimetry and the high-throughput capability of Thermofluor have vastly facilitated the screening of crystallization conditions of proteins and large mutant libraries in structural genomics programs, as well as ligands in drug discovery and functional genomics programs. These techniques are limited by their requirement for both highly purified proteins and solvatochromic dyes, prompting the need for more robust high-throughput technologies that can be used with crude protein samples. This need was met with the development of a new high-throughput technology for the quantitative determination of protein stability and ligand binding by differential scanning fluorimetry of proteins tagged with green fluorescent protein (GFP). This technology is based on the principle that a change in the proximal environment of GFP, such as unfolding and aggregation of the protein of interest, is measurable through its effect on the fluorescence of the fluorophore. The technology is simple, fast and insensitive to variations in sample volumes, and the useful temperature and pH range is 30–80 °C and 5–11 respectively. The system does not require solvatochromic dyes, reducing the risk of interferences. The protein samples are simply mixed with the test conditions in a 96-well plate and subjected to a melt-curve protocol using a real-time thermal cycler.
A test of the model followed using results from Mount 65, Chalco in Mexico by Riciputi et al. This technique used numerical calculation to model the formation of the entire diffusion profile as a function of time and fitted the derived curve to the hydrogen profile. The FD equations are based on a number of assumptions about the behavior of water as it diffused into the glass and characteristic points of the SIMS H+ diffusion profile. In Rhodes, Greece, under the direction and invention of Ioannis Liritzis, the dating approach is based on modeling the S-like hydrogen profile by SIMS, following Fick's diffusion law, and an understanding of the surface saturation layer (see Figure). In fact, the saturation layer on the surface forms up to a certain depth depending on factors that include the kinetics of the diffusion mechanism for the water molecules, the specific chemical structure of obsidian, as well as the external conditions affecting diffusion (temperature, relative humidity, and pressure). Together these factors result in the formation of an approximately constant, boundary concentration value, in the external surface layer. Using the end product of diffusion, a phenomenological model has been developed, based on certain initial and boundary conditions and appropriate physicochemical mechanisms, that express the H2O concentration versus depth profile as a diffusion/time equation.
== Mechanism of action == Loop diuretics are 90% bonded to proteins and are secreted into the kidney's proximal convoluted tubule through organic anion transporter 1 (OAT-1), OAT-2, and ABCC4. Loop diuretics act on the Na+-K+-2Cl− symporter (NKCC2) located on the luminal membrane of cells along the thick ascending limb of loop of Henle to inhibit sodium, chloride and potassium reabsorption. This is achieved by competing for the Cl− binding site. Loop diuretics also inhibit NKCC2 at the macula densa, reducing sodium transported into macula densa cells. This stimulates the release of renin, which through renin–angiotensin system, increases fluid retention in the body, increases the perfusion of glomerulus, thus increasing glomerular filtration rate (GFR). At the same time, loop diuretics inhibit the tubuloglomerular feedback mechanism so that increase in salts at the lumen near macula densa does not trigger a response that reduces the GFR. Loop diuretics also inhibit magnesium and calcium reabsorption in the thick ascending limb. Absorption of magnesium and calcium are dependent upon the positive voltage at the luminal side and less positive voltage at the interstitial side with transepithelial voltage gradient of 10 mV. This causes the magnesium and calcium ions to be repelled from luminal side to interstitial side, promoting their absorption. The difference in voltage in both sides is set up by potassium recycling through renal outer medullary potassium channel.
=== Gastroenterology and cancer screening === A 2024 study published in The American Journal of Gastroenterology examined real-world adherence to repeat stool-based colorectal cancer screening among individuals at average risk, using fecal immunochemical tests (FIT) and multi-target stool DNA tests (mt-sDNA). The authors analyzed patterns of repeat testing and evaluated factors associated with adherence over time.
Sources: en.wikipedia.org
The first woman, Valentina Tereshkova, was launched into space on Vostok 6 on June 16, 1963, as (possibly) a medical experiment. She was the only one to fly of a small group of female parachutist factory workers (unlike the male cosmonauts who were military test pilots), chosen by the head of cosmonaut training because he read a tabloid article about the "Mercury 13" group of women wanting to become astronauts, and got the mistaken idea that NASA was actually entertaining this. Five months after her flight, Tereshkova married Vostok 3 cosmonaut Andriyan Nikolayev, and they had a daughter.
Pakistan's desire for a united Islamic bloc, called Islamistan, wasn't supported by other Muslim governments, though figures like the Grand Mufti of Palestine, Al-Haj Amin al-Husseini, and leaders of the Muslim Brotherhood were drawn to the country. Pakistan's desire for an international organisation of Muslim countries was fulfilled in the 1970s when the Organisation of Islamic Conference (OIC) was formed. In East Pakistan, Bengali Muslims increasingly prioritised Bengali ethno-nationalism over religious nationalism. The Islamist party Jamaat-e-Islami backed an Islamic state and opposed Bengali nationalism. After the 1970 general elections, the Parliament crafted the 1973 Constitution. It declared Pakistan an Islamic Republic, with Islam as the state religion, and mandated laws to comply with Islamic teachings laid down in the Quran and Sunnah and that no law repugnant to such injunctions could be enacted. Additionally, it established institutions like the Shariat Court and the Council of Islamic Ideology to interpret and apply Islam. Zulfikar Ali Bhutto faced opposition under the banner of Nizam-e-Mustafa ("Rule of the Prophet"), advocating an Islamic state. Bhutto conceded to some Islamist demands before being ousted in a coup. General Zia-ul-Haq, after seizing power, committed to establishing an Islamic state and enforcing sharia law. He instituted Shariat judicial courts, and court benches, to adjudicate using Islamic doctrine. Zia aligned with Deobandi institutions, exacerbating sectarian tensions with anti-Shia policies.
== Further reading == Bolognia JL, Lapia K, Somma S (January 2001). "Depigmentation therapy. Dermatologic Therapy". 14 (1): 29–34. doi:10.1046/j.1529-8019.2001.014001029.x. S2CID 221649640. {{cite journal}}: Cite journal requires |journal= (help)
== See also == History of radar Acoustic mirror Battle of the Beams British military history of World War II Chain Home Low Civilian Technical Corps Ground-controlled interception ROTOR RAF Air Defence Radar Museum Castles in the Sky (film)
"Took up the cooperative movement" at its annual convention in 1919. Moved into its new 4-story building in the West End at the corner of Leverett and Ashland Street and moved in on November 13, 1920. The building contained the group's offices, cooperative grocery, creamery, shoe and dry goods store, and printing plant. The "Co-operative Wholesale Society" consisting of the "Finnish, Lithuanian, and Italian Co-operative of New England" had its offices and warehouse in this building as well. Jewish Progressive Order - Headquartered in Philadelphia. Supported the Palestine Restoration Fund by a "shekel tax" of 25 cents per member. Jewish National Workers Alliance Order of Brith Abraham - Founded in New York in 1859. Originally restricted to Reform Jews. Female lodges, consisting of the female relatives of members of the order, could be formed with the sanction of the Grand Lodge and could elect one of the Past Presidents of the male lodges as their officers. In 1899 there were 11,000 regular members and 1,000 members of the female lodges. 8,000 regular members and three-fifths of the 160 lodges were located in New York City. In 1923 it had 198 lodges, 15,152 benefit members, and 195 social members. It had 8,000 members when it became defunct in 1927. Headquarters in 1923 located at 266-268 Grand Street New York City. The ceremony of the order was calculated to inculcate the values of harmony, wisdom, and justice. The order's emblem was an "interlaced triangle" with a representation of Abraham about to sacrifice Jacob.
Sources: en.wikipedia.org
Cardarine is commonly known as GW501516 or GW-1516. These names refer to the same synthetic compound. It is not a brand-name approved medicine.
No, cardarine is not a steroid. It is classified as a PPARδ agonist. Its structure and receptor target differ from anabolic steroids.
No regulatory agency has approved cardarine as a medicine. It was investigated in early research but development was discontinued. It is not available as a prescription drug.
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.