Everything below concerns Anti-doping testing. We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Updated 2025-08-19. Numbers and descriptions here follow the published literature rather than marketing material.
GW501516 acts as an agonist at the peroxisome proliferator-activated receptor delta, a nuclear receptor that regulates gene expression. Activation shifts transcription toward genes involved in fatty acid uptake, oxidation, and energy expenditure. The compound does not bind the androgen receptor and therefore differs from anabolic steroids and SARMs. In rodent models, this metabolic shift has been linked to increased running endurance and reduced fat accumulation. The exact downstream pathways in humans remain incompletely characterized.
Early clinical research explored GW501516 for lipid disorders, obesity, and diabetes. Some short-term human studies reported changes in HDL cholesterol, LDL cholesterol, and triglycerides. The development program was discontinued after rodent studies showed dose-dependent tumor formation in multiple tissues, including liver, bladder, stomach, and skin. These findings raised concerns about long-term cancer risk in humans. Because human exposure data are limited, the clinical significance of the rodent tumors remains uncertain.
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.
Published studies have examined GW501516 in animal models of obesity, insulin resistance, and exercise endurance. Early human trials reportedly ended, and development was discontinued after preclinical findings raised concerns about cancer in some rodent studies. Regulatory agencies have not approved cardarine for any medical use. Its availability through non-pharmaceutical channels raises questions about identity, purity, and legal status that are separate from its laboratory pharmacology. Those questions are often addressed through analytical testing rather than assumptions about product labels.
| Property | Value | Notes |
|---|---|---|
| Primary target | PPARδ | Nuclear receptor; not androgen receptor |
| Studied indications | Dyslipidemia; obesity; diabetes | Early clinical research; development discontinued |
| Rodent toxicity | Tumor formation in multiple tissues | Dose-dependent findings in some studies |
| Human approval | None | No approved therapeutic use |
| Typical analytical method | LC-MS/MS | Used for identity and quantification |
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.
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.
=== Vascular disease === The infusion of a FFAR2-activating SCFA, i.e. acetic, propionic, or butyric acid, into mice causes short-term falls in their blood pressure. Similarly, patients undergoing hemodialysis that uses a hemodialysis solution containing acetic acid have an increased risk of becoming hypotensive compared to patients dialyzed with an acetic acid-free solution. Long-term oral intake of FFAR2-activating SCFAs also lower blood pressure in mice and humans. Furthermore, FFAR2 gene knockout mice developed perivascular fibrosis (which is an indicator of blood vessel disease), higher end-diastolic blood pressures, and higher pulse pressures. Mice lacking both FFAR2 and FFAR3 had exaggerated responses to hypertension; this seems to happen via changes to the gut epithelial barrier and activation of the immune system. Finally, in the angiotensin II–infusion model of hypertension, mice had reduced levels of FFAR2 in their kidney tissues compared to control mice and a study in humans reported that the levels of FFAR2 in the circulating white blood cells of hypertensive individuals was significantly lower than that in individuals with normal blood pressures. These findings suggest that FFAR2 functions to reduce blood pressure as well as hypertension induced vascular disease in mice and humans and support further studies to examine these relationships.
== Other animals == The rectus abdominis is similar in most vertebrates. The most obvious difference between animal and human abdominal musculature is that in animals, there are a different number of tendinous intersections.
=== Particle detection === One potential application area involves particle detection in fluids. Particle detection of small fluid-borne particles down to about 1 μm in diameter is typically achieved using a Coulter counter, in which electrical signals are generated when a weakly-conducting fluid such as in saline water is passed through a small (~100 μm diameter) pore, so that an electrical signal is generated that is directly proportional to the ratio of the particle volume to the pore volume. The physics behind this is relatively simple, described in a classic paper by DeBlois and Bean, and the implementation first described in Coulter's original patent. This is the method used to e.g. size and count erythrocytes (red blood cells) as well as leukocytes (white blood cells) for standard blood analysis. The generic term for this method is resistive pulse sensing (RPS); Coulter counting is a trademark term. However, the RPS method does not work well for particles below 1 μm diameter, as the signal-to-noise ratio falls below the reliably detectable limit, set mostly by the size of the pore in which the analyte passes and the input noise of the first-stage amplifier. The limit on the pore size in traditional RPS Coulter counters is set by the method used to make the pores, which while a trade secret, most likely uses traditional mechanical methods.
In September 2013, the Supreme People's Court authorized a three-year prison term for bloggers who shared more than 500 times any content considered "defamatory". In 2014, the Chinese government launched the Cleaning the Web campaign, aiming to crack down on pornographic, vulgar, and politically questionable content. It also launched Operation Qinglang campaigns since 2016 to "clean up" the Chinese internet. China under Xi has taken a strong stand to control internet usage inside China, including Google, Facebook and Wikipedia, advocating Internet censorship under the concept of internet sovereignty. Likewise, the situation for users of Weibo has been described as a change from fearing one's account would be deleted, to fear of arrest. The Provisions on the Governance of the Online Information Content Ecosystem, which came into effect in 2020, defined the scope of legal expression for service platforms and content creators. Under Xi's administration, China started enforcing an Internet real-name system for online platforms, requiring them to collect users' real names, ID numbers, and other information when providing services.
Sources: en.wikipedia.org
Cartier Women's Initiative is an annual international entrepreneurship program created in 2006 by the French luxury goods maker Cartier (jeweler). The initiative aims to drive change by empowering women impact entrepreneurs. It is open to women led and owned business from any nation and sector that demonstrate a strong, sustainable social or environmental impact.
For the next three years, DiCaprio narrated documentaries and served as a producer for films. In 2016, he was an executive producer for The Ivory Game and Catching the Sun; he also produced, hosted and narrated the documentary Before the Flood about climate change. He produced the crime drama Live by Night (2016), which received unenthusiastic reviews and failed to recoup its $65 million production budget. His next production ventures were in 2018—the psychological horror Delirium and the commercially failed action–adventure Robin Hood. After producing and narrating the 2019 global warming documentary Ice on Fire, DiCaprio returned to acting following a four-year break in Quentin Tarantino's comedy-drama Once Upon a Time in Hollywood, which traces the relationship between Rick Dalton (DiCaprio), an aging television actor and his stuntman, Cliff Booth (Brad Pitt). To help the film's financing, DiCaprio and Pitt agreed to take a pay cut, and they each received $10 million. DiCaprio liked working with Pitt, and Tarantino described the pair as the most exciting since Robert Redford and Paul Newman. DiCaprio was fascinated with the film's homage to Hollywood and focus on the friendship between his and Pitt's characters. He drew from real-life experience of witnessing the struggles and rejections of his actor friends in the industry. The film premiered at the 2019 Cannes Film Festival, where critics praised his and Pitt's performances.
A good practice is a procedure or set of procedures that are prescribed or accepted as being suitable or effective within a given professional or commercial setting. They are used in quality guidelines and regulations, including the pharmaceutical and food industries, for example good agricultural practice (GAP) (see more examples below). In general, GxP is a placeholder abbreviation for the good practice within a particular field or fields, where the "x" can be substituted for the field(s) in question. GxP can also be used to refer to collections of quality guidelines. To denote the current good practice, a "c" or "C" is sometimes added to the front of the initialism (cGxP), which may hint that any good practice may be subject to future change. For example, "current good manufacturing practice" may be abbreviated "cGMP".
Sources: en.wikipedia.org
First line treatment for metastatic breast cancer: the MARIANNE study compares taxane (docetaxel or paclitaxel) plus trastuzumab vs T-DM1 vs T-DM1 plus pertuzumab as first-line treatment for people with HER2 positive unresectable locally advanced or metastatic breast cancer; On 19 December 2014, Roche reported the results of the MARIANNE study. Neither Kadcyla-containing treatment significantly improved progression-free survival compared to Herceptin and chemotherapy. a phase III trial for HER2+ gastric cancer compares T-DM1 to physician's choice of taxane (docetaxel or paclitaxel). On 22 October 2015, Roche and co-developer ImmunoGen disclosed that trastuzumab emtansine had failed to meet its primary endpoint in the Phase II/III GATSBY trial investigating the second line treatment of HER2-positive advanced gastric cancer. the TH3RESA study is comparing T-DM1 vs treatment of physician's choice for people with HER2 positive metastatic breast cancer previously treated with trastuzumab and lapatinib. Interim results for TH3RESA suggest a doubling of progression-free survival from three months to six months.
== History == Catalase was first noticed in 1818 by Louis Jacques Thénard, who discovered hydrogen peroxide (H2O2). Thénard suggested its breakdown was caused by an unknown substance. In 1900, Oscar Loew was the first to give it the name catalase, and found it in many plants and animals. In 1937 catalase from beef liver was crystallized by James B. Sumner and Alexander Dounce and the molecular weight was measured in 1938. The amino acid sequence of bovine catalase was determined in 1969, and the three-dimensional structure in 1981.
Systematic botany is part of systematic biology, which is concerned with the range and diversity of organisms and their relationships, particularly as determined by their evolutionary history. It involves, or is related to, biological classification, scientific taxonomy and phylogenetics. Biological classification is the method by which botanists group organisms into categories such as genera or species. Biological classification is a form of scientific taxonomy. Modern taxonomy is rooted in the work of Carl Linnaeus, who grouped species according to shared physical characteristics. These groupings have since been revised to align better with the Darwinian principle of common descent – grouping organisms by ancestry rather than superficial characteristics. While scientists do not always agree on how to classify organisms, molecular phylogenetics, which uses DNA sequences as data, has driven many recent revisions along evolutionary lines and is likely to continue to do so. The dominant classification system is called Linnaean taxonomy. It includes ranks and binomial nomenclature. The nomenclature of botanical organisms is codified in the International Code of Nomenclature for algae, fungi, and plants (ICN) and administered by the International Botanical Congress. Kingdom Plantae belongs to Domain Eukaryota and is broken down recursively until each species is separately classified. The order is: Kingdom; Phylum (or Division); Class; Order; Family; Genus (plural genera); Species.
Sources: en.wikipedia.org
It targets PPARδ, a nuclear receptor involved in lipid and energy metabolism. It does not act primarily on androgen receptors. This distinction separates it from SARMs.
Rodent studies found dose-dependent tumors in several organs. The sponsor discontinued the program over cancer concerns. Human risk from long-term use remains unknown.
Controlled human endurance trials are lacking. Animal studies show increased exercise capacity under some conditions. Anecdotal reports are not equivalent to clinical evidence.
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.