PPARδ agonist 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.
Last reviewed on 2025-12-07. Where a claim depends on a specific study, the study is described rather than over-claimed.
Published literature on cardarine includes in vitro assays, rodent experiments, and a small number of human studies. Reports describe effects on exercise capacity and lipid metabolism in animals, while human evidence is sparse. Many online descriptions present the compound as a proven endurance aid, a claim not supported by regulatory approval or large clinical trials. Analytical studies focus on identifying the parent compound and its metabolites in biological samples. Important uncertainties include species differences, dose-response relationships, and the relevance of rodent tumor findings to humans.
Cardarine is the common name for GW501516, a synthetic compound studied as a peroxisome proliferator-activated receptor delta agonist. Researchers developed it to explore treatments for lipid disorders and metabolic conditions. It is not an approved medicine in any country. Early clinical work examined changes in HDL cholesterol and triglycerides, but development was discontinued after animal studies raised concerns about cancer. The compound remains available as a research chemical and appears in discussions of performance enhancement.
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.
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.
| Property | Value | Notes |
|---|---|---|
| Common name | Cardarine | Also called GW501516 and endurobol. |
| Chemical formula | C21H18F3NO3S2 | Molecular weight about 453.5 g/mol. |
| Appearance | White to off-white solid | Form depends on synthesis and purity. |
| Solubility | Soluble in DMSO and ethanol | Low solubility in water. |
| Typical storage | -20 °C, desiccated, protected from light | Common for research chemicals. |
Literature on cardarine often separates receptor pharmacology from toxicology. Mechanistic papers describe PPARδ activation and gene expression changes, while safety assessments focus on carcinogenicity and species differences. Questions remain about whether rodent tumors arise through PPARδ-dependent or off-target mechanisms. Another open area is how human metabolism and exposure compare with those in animal studies. Analytical methods such as liquid chromatography–mass spectrometry are used to confirm identity in biological and product samples.
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.
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.
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.
In the fitness and bodybuilding literature, cardarine is frequently discussed as an endurance agent or fat-loss compound, although such claims are not supported by robust clinical evidence. Online descriptions often mix animal data, user anecdotes, and marketing language. Researchers who study PPARδ agonists distinguish between receptor activation in controlled experiments and unsupervised use of unverified products. The latter introduces unknown purity, dose, and interactions, making reported experiences difficult to interpret scientifically.
GW501516 acts as an agonist at peroxisome proliferator-activated receptor delta, a nuclear receptor involved in transcription of genes related to lipid handling and energy use. Activation of PPARδ can shift skeletal muscle toward greater fatty acid oxidation in animal models, which is one reason it drew interest for metabolic disease and exercise research. The exact downstream effects depend on tissue, species, dose, and duration. Human data are sparse, so many proposed benefits remain hypotheses rather than established clinical outcomes.
The term senile dementia of the Alzheimer type (SDAT) was used for a time to describe the condition in those over 65, with classical Alzheimer's disease being used to describe those who were younger. Eventually, the term Alzheimer's disease was formally adopted in medical nomenclature to describe individuals of all ages with a characteristic common symptom pattern, disease course, and neuropathology. The National Institute of Neurological and Communicative Disorders and Stroke (NINCDS) and the Alzheimer's Disease and Related Disorders Association (ADRDA, now known as the Alzheimer's Association) established the most commonly used NINCDS-ADRDA Alzheimer's Criteria for diagnosis in 1984, extensively updated in 2007. These criteria require that the presence of cognitive impairment, and a suspected dementia syndrome, be confirmed by neuropsychological testing for a clinical diagnosis of possible or probable Alzheimer's disease. A histopathologic confirmation including a microscopic examination of brain tissue is required for a definitive diagnosis. Good statistical reliability and validity have been reported between the diagnostic criteria and definitive histopathological confirmation.
The phenomenon of the tech bro, or brogrammer, sees bro culture take root in the technology industry. The term is almost always applied pejoratively, generally in reference to a workplace culture that undervalues people who do not fit into the bro lifestyle, particularly women. Brogrammer culture can be contrasted with geek culture, which is said to value ability and passion over image. In 2013, former Microsoft game designer Daniel Cook wrote that the company was responsible for developing the bro subculture within video gaming, explaining that the "Xbox put machismo, ultra-violence and chimpboys with backwards caps in the spotlight. [...] Gamers were handed a pre-packaged group identity via the propaganda machine of a mega corporation." Cook writes that Microsoft has done this in order to distance the Xbox from its console competitors, which were portrayed as "kids platform[s]".
Malaysia operates an efficient and widespread two-tier healthcare system, consisting of a universal healthcare system and a co-existing private healthcare system; provided by highly subsidised healthcare through its extensive network of public hospitals and clinics. The Ministry of Health is the main provider of healthcare services to the country's population. Malaysia's healthcare system is considered to be among the most developed in Asia, which contributes to its thriving medical tourism industry. Malaysia spent 3.83% of its GDP on healthcare in 2019. In 2020, the overall life expectancy in Malaysia at birth was 76 years (74 years for males and 78 years for females), and it had an infant mortality rate of 7 deaths per 1000 births. Malaysia had a total fertility rate of 2.0 in 2020, which is just below the replacement level of 2.1. In 2020, the country's crude birth rate was 16 per 1000 people, and the crude death rate was 5 per 1000 people. In 2021, the principal cause of death among Malaysian adults was coronary artery disease, representing 17% of the medically certified deaths in 2020 – being followed by pneumonia; which accounted for 11% of the deaths. Transport accidents are considered a major health hazard, as Malaysia, relative to its population, has one of the highest traffic fatality rates in the world. Smoking is also considered a major health issue across the country.
=== P53 and p73 === p53 and p73 are tumor suppressor proteins and their degradation is tightly regulated by ubiquitination. Recently it was shown that their degradation can also occur via an ubiquitin-independent process; NQO1 blocks p53 and p73 degradation in the presence of NADH and protects them from 20S proteasomal degradation. This protein-protein interaction between p53 and NQO1 was non-catalytic.
An ongoing conflict between the Lebanese militant group Hezbollah and Israel began on 8 October 2023, when Hezbollah launched rockets and artillery at Israeli positions following Hamas's October 7 attacks on Israel. The conflict escalated into a prolonged exchange of bombardments, leading to extensive displacement in Israel and Lebanon. The conflict is part of the broader Middle Eastern crisis that began with Hamas's attack, with the short Israeli invasion of Lebanon in 2024 marking the largest escalation of the Hezbollah–Israel conflict since the 2006 Lebanon War. In Arabic, the conflict (2023–2024) is referred to as the "Support War" or the "Gaza Support War." On 8 October 2023, Hezbollah started firing guided rockets and artillery shells at Israeli positions in the Shebaa Farms, which it said was in solidarity with Palestinians following the 7 October Hamas-led attack on Israel and beginning of Israeli bombing of the Gaza Strip. Israel retaliated by launching drone strikes and artillery shells at Hezbollah positions. Israel also carried out airstrikes throughout Lebanon and in Syria. In northern Israel, the ongoing conflict has forced approximately 96,000 individuals to leave their homes, while in Lebanon, over 1.4 million individuals had been displaced by late October. Hezbollah stated it would not stop attacks against Israel until it stops its military operations in Gaza; Israel said its attacks would continue until its citizens could return safely to the north.
Sources: en.wikipedia.org
Evolutionary biology is a subfield of biology that analyzes the mechanisms of evolution. Evolution accounts for the unity and diversity of life on Earth; Theodosius Dobzhansky famously said "nothing in biology makes sense except in the light of evolution". Population genetics for example studies how genetic variation develops, how it is inherited, and how the evolutionary mechanisms shape a population's genetic composition. Research in evolutionary biology covers many topics and incorporates ideas from diverse areas, such as molecular genetics and mathematical and theoretical biology. Some fields of evolutionary research try to explain phenomena that were poorly accounted for in the modern evolutionary synthesis. These include speciation, the evolution of sexual reproduction, the evolution of cooperation, the evolution of ageing, and evolvability. Ecology is the study of the distribution and abundance of life, the interaction between organisms and their environment.
For example, from the 1970s questions about the evolution of human behaviour were much more frequently seen in archaeology. The dating framework provided by radiocarbon led to a change in the prevailing view of how innovations spread through prehistoric Europe. Researchers had previously thought that many ideas spread by diffusion through the continent, or by invasions of peoples bringing new cultural ideas with them. As radiocarbon dates began to prove these ideas wrong in many instances, it became apparent that these innovations must sometimes have arisen locally. This has been described as a "second radiocarbon revolution". More broadly, the success of radiocarbon dating stimulated interest in analytical and statistical approaches to archaeological data. Taylor has also described the impact of AMS, and the ability to obtain accurate measurements from very small samples, as ushering in a third radiocarbon revolution. Occasionally, radiocarbon dating techniques date an object of popular interest, for example, the Shroud of Turin, a piece of linen cloth thought by some to bear an image of Jesus Christ after his crucifixion. Three separate laboratories dated samples of linen from the Shroud in 1988; the results pointed to 14th-century origins, raising doubts about the shroud's authenticity as an alleged 1st-century relic. Researchers have studied other isotopes created by cosmic rays to determine if they could also be used to assist in dating objects of archaeological interest; such isotopes include 3He, 10Be, 21Ne, 26Al, and 36Cl.
Shut-down separator (for overheating) Tear-away tab (for internal pressure relief) Vent (pressure relief in case of severe outgassing) Thermal interrupt (overcurrent/overcharging/environmental exposure) These features are required because the negative electrode produces heat during use, while the positive electrode may produce oxygen. However, these additional devices occupy space inside the cells, add points of failure, and may irreversibly disable the cell when activated. Further, these features increase costs compared to nickel metal hydride batteries, which require only a hydrogen/oxygen recombination device and a back-up pressure valve. Contaminants inside the cells can defeat these safety devices. Also, these features cannot be applied to all kinds of cells; prismatic high-current cells cannot be equipped with a vent or thermal interrupt. High-current cells must not produce excessive heat or oxygen, lest there be a failure, possibly violent. Instead, they must be equipped with internal thermal fuses which act before the anode and cathode reach their thermal limits. Replacing the lithium cobalt oxide positive electrode material with a lithium metal phosphate such as lithium iron phosphate (LFP) improves cycle counts, shelf life and safety, but lowers capacity. As of 2006, these safer lithium-ion batteries were mainly used in electric cars and other large-capacity battery applications, where safety is critical. In 2016, an LFP-based energy storage system was chosen to be installed in Paiyun Lodge on Mt.Jade (Yushan) (the highest lodge in Taiwan).
=== Multiplexing === When there are many more computers to be backed up than there are destination storage devices, the ability to use a single storage device with several simultaneous backups can be useful. However cramming the scheduled backup window via "multiplexed backup" is only used for tape destinations.
As benzene can cause cancer, National Institute for Occupational Safety and Health recommends that all workers wear special breathing equipment when they are likely to be exposed to benzene at levels exceeding the recommended (8-hour) exposure limit of 0.1 ppm. According to Occupational Safety and Health Administration’s Supporting Statement for the Information Collection Request for the Benzene standard, an estimated 12,270 establishments are subject to the requirements of the standard.
Sources: en.wikipedia.org
== Structure and properties == Because of slow rotation about the N-C(O) bond, NMF exists as two rotamers that can be distinguished by NMR spectroscopy. The two principal resonance structures for one of these rotamers is shown:
A shift in substrate utilization can be induced by conditions such as eating or fasting, and the oxidation of either glucose or fatty acids tends to suppress the use of the other substrate (a phenomenon known as the Randle cycle). The intake of macronutrients stimulates the secretion and release of insulin and other chemical messengers such as glucagon-like peptide 1 (GLP-1), which act to regulate glucose levels, insulin sensitivity, satiety, and fat balance in the body. In the postprandial period, insulin is produced by the pancreas and serves to activate carbohydrate metabolism and stimulate glucose disposal in order to meet metabolic demands and prevent glucotoxicity. When insulin is unable to efficiently stimulate glucose utilization, the body's tissues become resistant to its hypoglycemic effects, promoting the development of a state of insulin resistance over time. This can happen because of chronic exposure to hyperinsulinemia due to poor diet, sedentary lifestyle, obesity, and other potentially modifiable risk factors. The phenomenon is similar to leptin resistance and can potentially lead to many deleterious health effects stemming from chronically elevated insulin levels, such as excessive fat storage and de novo synthesis, hepatic and peripheral insulin resistance, nonalcoholic fatty liver disease (NAFLD), hypertension and dyslipidemia, and decreased resting energy expenditure (REE) caused by impaired diet-induced thermogenesis.
=== Alpha-synuclein === Research in 2020 concluded that protein misfolding cyclic amplification could be used to distinguish between two progressive neurodegenerative diseases, Parkinson's disease and multiple system atrophy, being the first process to give an objective diagnosis of multiple system atrophy instead of just a differential diagnosis.
Immunosuppressants Non-steroidal anti-inflammatory drugs (NSAIDs) and salicylates Inhibitors of thyrosine kinases Opiates Treatment for benign prostatic hyperplasia Hormonal treatments and antiadrenergic drugs Antibiotics, antifungals, antiparasites, antivirals, and antimalarials Antidepressants Anti-gastroesophageal reflux drugs Anti-epileptic drugs Antihypertensive drugs Certain medications in the following classes of drugs may affect male sexual libido or sexual function**:
Sources: en.wikipedia.org
Cardarine is a common name for the investigational compound GW501516. It acts as a PPARδ agonist and is not approved for human use. It is prohibited in sport.
It activates PPARδ, a nuclear receptor that influences gene expression related to lipid and energy metabolism. Animal studies show changes in endurance and lipid levels. Human effects and risks are not well established.
No, cardarine is not a steroid. It belongs to a different chemical class, the PPARδ agonists. It is also not a selective androgen receptor modulator.
Anti-doping laboratories typically use LC-MS/MS to detect GW501516 and its metabolites in urine. The method is sensitive and can identify the compound at low concentrations. Detection depends on sample timing, metabolism, and the specific assay.