A practical reference on Cardarine: what it is, how it behaves, what the literature reports, and where the honest uncertainties sit.
Reviewed 2026-01-25. Anything still debated is marked as such rather than presented as settled.
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.
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.
Safety concerns emerged from long-term animal studies. In rodents given the compound for extended periods, researchers found an increased incidence of certain cancers, including liver and bladder tumors. These findings contributed to the discontinuation of clinical development. Whether similar risks apply to short-term or low-level exposure in humans is not established, and controlled human safety data are limited. The relevance of high-dose rodent carcinogenicity findings to human use remains a subject of debate.
Human trials of GW501516 were small and short in duration. They examined lipid levels, glucose handling, and other metabolic markers, but the programs were halted after the animal cancer findings. No approved therapeutic product exists, and published human data are insufficient for establishing long-term safety. Reports of use for athletic performance come mainly from non-clinical settings and cannot be verified through controlled trials. Independent testing of products sold as cardarine has found inconsistent purity and labeling.
Laboratory studies indicate that GW501516 activates PPARδ, a nuclear receptor involved in fatty acid oxidation and energy metabolism. In rodent experiments, treated animals often showed increased endurance and reduced fat mass. These effects were observed under controlled conditions and do not establish safe or effective use in humans. The exact dose-response relationship in humans remains poorly characterized. Species differences in metabolism can affect how results translate across animals and people.
| Property | Value | Notes |
|---|---|---|
| Regulatory status | Not approved for human therapeutic use | No marketing authorization identified in major jurisdictions. |
| Anti-doping class | PPARδ agonist; hormone and metabolic modulators | Listed on the WADA Prohibited List. |
| Common test matrix | Urine | Also blood and tissue in research settings. |
| Typical analytical method | LC-MS/MS | Targets parent compound and metabolites. |
| Major safety signal | Tumor findings in rodents | Human relevance not established; limited human data. |
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 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.
Regulatory treatment varies, but cardarine is not approved as a medicine. Sports authorities list GW501516 as a prohibited substance, and it is banned at all times under the World Anti-Doping Agency code. Many countries restrict sales for human consumption, while online vendors market it as a research chemical. Such products may lack purity data, and their actual contents can differ from the label. Purchasing or possessing cardarine may carry legal consequences depending on jurisdiction. The compound is not a dietary supplement ingredient in regulated markets.
Clinical development stopped after rodent studies showed tumors at multiple sites. Whether those findings predict human cancer risk remains an open question, but they led sponsors to discontinue programs. Human safety data are limited to small, short-term studies that were not designed to assess cancer risk. Reported effects in those studies included changes in blood lipids, but the evidence is insufficient for medical use. Long-term consequences of nonmedical use are not well characterized. Questions about dose, duration, and individual susceptibility remain unresolved.
Cardarine is a common name for GW501516, an investigational compound developed in the 1990s for metabolic conditions. It acts as an agonist at peroxisome proliferator-activated receptor delta, a nuclear receptor involved in lipid and energy metabolism. The compound is frequently mislabeled as a selective androgen receptor modulator, or SARM, but its molecular target is different. GW501516 reached early clinical testing before development was discontinued. It has no approved therapeutic use in any country. The name cardarine is not a formal international nonproprietary name.
The antibody selectively binds to protein A/G, so a high level of purity (generally >80%) is obtained. The generally harsh conditions of this method may damage easily damaged antibodies. A low pH can break the bonds to remove the antibody from the column. In addition to possibly affecting the product, low pH can cause protein A/G itself to leak off the column and appear in the eluted sample. Gentle elution buffer systems that employ high salt concentrations are available to avoid exposing sensitive antibodies to low pH. Cost is also an important consideration with this method because immobilized protein A/G is a more expensive resin. To achieve maximum purity in a single step, affinity purification can be performed, using the antigen to provide specificity for the antibody. In this method, the antigen used to generate the antibody is covalently attached to an agarose support. If the antigen is a peptide, it is commonly synthesized with a terminal cysteine, which allows selective attachment to a carrier protein, such as KLH during development and to support purification. The antibody-containing medium is then incubated with the immobilized antigen, either in batch or as the antibody is passed through a column, where it selectively binds and can be retained while impurities are washed away. An elution with a low pH buffer or a more gentle, high salt elution buffer is then used to recover purified antibody from the support.
== Background == Marley was born in Covina, California and raised in Salem, Oregon. Growing up, Marley was a reptile enthusiast. From his earliest memories, Marley was always drawing, and most often his subject was monsters. His father was an aviarist and breeder of rare color mutations of Australian parrots and great blue turacos. Marley served as a missionary in the Atacama Desert in Chile for two years at 19 years old. After this, he studied design at Brigham Young University. During university, he took sabbaticals to work with fashion brands such as Donna Karan, Gucci, Nike, and Giorgio Armani.
The HAIR-AN syndrome is a rare subtype of polyendocrine metabolic ovarian syndrome (PMOS) characterized by hyperandrogenism (HA), insulin resistance (IR) and acanthosis nigricans (AN). The symptoms of the HAIR-AN syndrome are largely due to severe insulin resistance, which can be secondary to blocking antibodies against the insulin receptor or genetically absent/reduced insulin receptor number/function. Insulin resistance leads to hyperinsulinemia which, in turn, leads to an excess production of androgen hormones by the ovaries. High levels of androgen hormones (hyperandrogenism) in females causes excessive hair growth, acne and irregular menstruation. Patients with both underlying mechanisms of insulin resistance may have more severe hyperandrogenism. Insulin resistance is also associated with diabetes, heart disease and excessive darkening of the skin (acanthosis nigricans)
=== Exhibits === The museum debuted a new exhibit on November 22, 2013. It consists of the engine of the Missouri Packet, the first steamboat to sink in the Missouri River in 1820. The Hawleys excavated its engine in 1987, just outside the small town of Arrow Rock, Missouri. It did not yield many other artifacts, yet still inspired the Hawleys to continue their quest for sunken steamboats. David Hawley told The Kansas City Star, "An engine like this has never been on display." He believes it to be the oldest extant maritime steam engine in the United States. In January 2013, the museum was closed for the first time in its 20-year history, to repair the ceiling and have the displays cleaned, reorganized, and expanded.
Sources: en.wikipedia.org
Binary compounds of zinc are known for most of the metalloids and all the nonmetals except the noble gases. The oxide ZnO is a white powder that is nearly insoluble in neutral aqueous solutions, but is amphoteric, dissolving in both strong basic and acidic solutions. The other chalcogenides (ZnS, ZnSe, and ZnTe) have varied applications in electronics and optics. Pnictogenides (Zn3N2, Zn3P2, Zn3As2 and Zn3Sb2), the peroxide (ZnO2), the hydride (ZnH2), and the carbide (ZnC2) are also known. Of the four halides, ZnF2 has the most ionic character, while the others (ZnCl2, ZnBr2, and ZnI2) have relatively low melting points and are considered to have more covalent character. In weak basic solutions containing Zn2+ ions, the hydroxide Zn(OH)2 forms as a white precipitate. In stronger alkaline solutions, this hydroxide is dissolved to form zincates ([Zn(OH)4]2−). The nitrate Zn(NO3)2, chlorate Zn(ClO3)2, sulfate ZnSO4, phosphate Zn3(PO4)2, molybdate ZnMoO4, cyanide Zn(CN)2, arsenite Zn(AsO2)2, arsenate Zn(AsO4)2·8H2O and the chromate ZnCrO4 (one of the few colored zinc compounds) are a few examples of other common inorganic compounds of zinc. Organozinc compounds are those that contain zinc–carbon covalent bonds. Diethylzinc ((C2H5)2Zn) is a reagent in synthetic chemistry. It was first reported in 1848 from the reaction of zinc and ethyl iodide, and was the first compound known to contain a metal–carbon sigma bond.
A new front of Marxist–Leninist revolution erupted in Africa between 1961 and 1987. Angola, Benin, Congo, Ethiopia, Mozambique and Somalia became communist states governed by their respective native peoples during the 1968–1980 period. Marxist–Leninist guerrillas fought the Portuguese Colonial War (1961–1974) in three countries, namely Angola, Guinea-Bissau and Mozambique. In Ethiopia, a Marxist–Leninist revolution deposed the monarchy of Emperor Haile Selassie (1930–1974) and established the Derg government (1974–1987) of the Provisional Military Government of Socialist Ethiopia. In Rhodesia (1965–1979), Robert Mugabe led the Zimbabwe War of Liberation (1964–1979) that deposed white-minority rule and then established the Republic of Zimbabwe. In the Seychelles, France-Albert René ruled over a Marxist–Leninist one party system from 1977 to 1991. In the Gambia, Kukoi Samba Sanyang initiated a Marxist–Leninist coup in 1981 (the initiative failed and he turned to mercenary activity abroad). In 1983, in Upper Volta, Thomas Sankara established a military and peasant based version of auto-centered Marxism–Leninism. Sankara refused aid and also refused to pay the country's foreign debts. He renamed Upper Volta 'Burkina Faso' (the land of upright people). His former friend and second in command, Blaise Compaoré, ordered Sankara's murder in 1987, ending the Burkinabe social experiment. In 1986, Yoweri Museveni's NRM force established "the Movement system," a political system where elections are held but no political parties are allowed to exist.
== Catalytic mechanism == The accepted catalytic mechanism, called the “ping-pong mechanism,” consists of four major stages. The first stage is the oxidation of the substrate by the double-redox center. After the hydroxyl group of substrate alcohol occupies the solvent coordination site, the hydroxyl group is deprotonated by Tyr495, followed by the release of Tyr495. This step makes the alcohol more prone to oxidation. The proton on the carbon to which the hydroxyl group used to be attached is then transferred to Tyr272 (serving as the hydrogen acceptor), coupled with the oxidation of the substrate. One electron goes to the radical ligand, the other electron goes to the copper(II) center, which is then reduced to copper(I) as a result. Meanwhile, Tyr272 radical is also reduced. The proton subtraction step is rate determining and stereospecific since only the pro-S hydrogen on the alcohol carbon is removed (supported by studies of its kinetic isotope effect). The overall result of stage 1 is the removal of two hydrogen atoms and the removal two electrons from the substrate, of which the order is unclear, however. The second stage is the release of oxidized substrate (aldehyde in this case) and the coordination of dioxygen at the substrate coordination site. In the third stage, dioxygen is rapidly reduced by copper(I) to form superoxide. The superoxide is a reactive species that subtracts the proton and an electron from the Tyr272 and re-forms the tyrosine radical. In the fourth stage, the hydroperoxide deprotonates Tyr496 and is released as H2O2.
Sources: en.wikipedia.org
β-catenin recruits other transcriptional coactivators, such as BCL9, Pygopus and Parafibromin/Hyrax. The complexity of the transcriptional complex assembled by β-catenin is beginning to emerge thanks to new high-throughput proteomics studies. However, a unified theory of how β‐catenin drives target gene expression is still missing, and tissue-specific players might assist β‐catenin to define its target genes. The extensivity of the β-catenin interacting proteins complicates our understanding: β-catenin may be directly phosphorylated at Ser552 by Akt, which causes its disassociation from cell-cell contacts and accumulation in cytosol, thereafter 14-3-3ζ interacts with β-catenin (pSer552) and enhances its nuclear translocation. BCL9 and Pygopus have been reported, in fact, to possess several β-catenin-independent functions (therefore, likely, Wnt signaling-independent).
==== Torture and abuse at Camp Mercury ==== In September 2005, a Human Rights Watch report alleged that residents of Fallujah called the 1st Battalion, 504th Infantry Regiment "the Murderous Maniacs," based on their treatment of Iraqis in detention. According to accounts of 82nd Airborne officers and NCOs, members of the battalion in 2003–2004 routinely used physical and mental torture as a means of intelligence gathering and for stress relief. According to the report, these battalion members estimated "...that about half of the detainees at Camp Mercury were released because they were not involved in the insurgency, but they left with the physical and mental scars of torture." After reporting these abuses yet being ignored by his superiors for 17 months, a then-anonymous captain took his allegations to three senior Republican senators—Bill Frist, John McCain, and John Warner—before the Army was finally compelled to launch an investigation. It was only after his report to the senators that action was taken. A staffer for one of them later told TIME magazine that the captain's claims were "extremely credible." The 1st Battalion, 504th Infantry Regiment's torture and abuse of prisoners later inspired the passage of the Detainee Treatment Act, and the anonymous captain was later revealed to be Ian Fishback. When Ian Fishback died in 2021, Senator Dick Durbin called Ian Fishback a military hero, saying:
Fish vs. Cephalopods TONMO.COM – The Octopus News Magazine Online – cephalopod articles and discussion Scientific American: Can a Squid Fly Out of the Water? Roger Hanlon's Seminar: "Rapid Adaptive Camouflage and Signaling in Cephalopods"
== Applications == One of the potent applications of siRNAs is the ability to distinguish the target versus non-target sequence with a single-nucleotide difference. This approach has been considered therapeutically crucial for silencing dominant gain-of-function (GOF) disorders, where the mutant allele causing disease differs from the wild-type allele by a single nucleotide (nt). These types of siRNAs, which are capable of distinguishing a single-nucleotide difference, are termed allele-specific siRNAs. ASP-RNAi is an innovative category of RNAi with the objective of suppressing the dominant mutant allele while sparing expression of the corresponding normal allele with the specificity of single-nucleotide differences between the two. ASP-siRNAs are potentially a novel and better remedial alternative for the treatment of autosomal dominant genetic disorders, especially in cases where wild-type allele expression is crucial for organism survival, such as Huntington disease (HD), DYT1 dystonia (Gonzalez-Alegre et al. 2003, 2005), Alzheimer's disease (AD) (Sierant et al. 2011), Parkinson's disease (PD) (Takahashi et al. 2015), amyotrophic lateral sclerosis (ALS) (Schwarz et al. 2006), and Machado-Joseph disease (MJD) (Alves et al. 2008). Their therapeutic potential has also been assessed for various skin disorders like epidermolysis bullosa simplex (Atkinson et al. 2011), epidermolytic palmoplantar keratoderma (EPPK) (Lyu et al. 2016), and lattice corneal dystrophy type I (LCDI) (Courtney et al. 2014).
Sources: en.wikipedia.org
No. Cardarine has not received approval for human therapeutic use in major jurisdictions. It remains an investigational compound.
It is classified as a PPARδ agonist on the WADA Prohibited List. Anti-doping laboratories can detect it and its metabolites in urine. Its use is banned in competition and usually out of competition.
Rodent studies reported increased tumor incidence at multiple sites. The human relevance remains uncertain, but the findings contributed to discontinuation of development. No long-term human cancer data are available.
Rodent studies reported increased endurance and fat oxidation after GW501516 exposure. Long-term studies also found higher rates of some tumors, which led to halted development.