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 2026-04-03. Where a claim depends on a specific study, the study is described rather than over-claimed.
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.
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.
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.
Laboratory studies have examined GW501516 in cell cultures and rodents for conditions such as dyslipidemia, insulin resistance, and obesity. Some trials in humans were initiated, but development was discontinued after preclinical findings raised concerns about cancer in certain models. Those findings do not prove that the compound causes cancer in people, but they contributed to regulatory caution. Later reviews often describe the evidence as preliminary and insufficient for assessing long-term safety.
| Property | Value | Notes |
|---|---|---|
| Common synonyms | GW501516; GW-1516; endurobol | GW501516 is the research code |
| Drug class | PPARδ agonist | Not a selective androgen receptor modulator |
| Molecular formula | C21H18F3NO3S2 | Established chemical formula |
| Molar mass | 453.5 g/mol | Calculated from the formula |
| Regulatory status | Prohibited in sport; not approved as medicine | Status varies by country |
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.
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.
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.
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.
At the molecular level, GW501516 binds and activates PPARδ, a nuclear receptor that regulates transcription. Activation shifts expression of genes involved in fatty acid oxidation, energy expenditure, and lipid transport in skeletal muscle and liver. Animal studies report increased endurance and altered lipid profiles after exposure. Human data are limited to small trials and do not establish long-term safety or efficacy. PPARδ also has roles in cell proliferation, so the relationship between activation and cancer risk remains an open question.
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.
=== Nosebleeds === Although oxymetazoline can be used for treatment of nosebleeds, it can also cause them under certain conditions, especially when nasal passages are dry. Oxymetazoline is a nasal decongestant that constricts blood vessels in the nasal mucosa, thereby reducing swelling and improving airflow. However, its use can lead to dryness and irritation of the nasal lining, which can increase the likelihood of nosebleeds.
==== Research on minimally processed vegetables ==== Watercress (Nasturtium officinale) is a rapidly growing aquatic or semi aquatic perennial plant. Because chemical agents do not provide efficient microbial reductions, watercress has been tested with gamma irradiation treatment in order to improve both safety and the shelf life of the product. It is traditionally used on horticultural products to prevent sprouting and post-packaging contamination, delay post-harvest ripening, maturation and senescence.
All three polymorphs crystallize simultaneously from aqueous solutions under ambient conditions. In additive-free aqueous solutions, calcite forms easily as the major product, while aragonite appears only as a minor product. At high saturation, vaterite is typically the first phase precipitated, which is followed by a transformation of the vaterite to calcite. This behavior seems to follow Ostwald's rule, in which the least stable polymorph crystallizes first, followed by the crystallization of different polymorphs via a sequence of increasingly stable phases. However, aragonite, whose stability lies between those of vaterite and calcite, seems to be the exception to this rule, as aragonite does not form as a precursor to calcite under ambient conditions.
The internal roof of the nose is composed by the horizontal, perforated cribriform plate (of the ethmoid bone) through which pass sensory filaments of the olfactory nerve (cranial nerve I); finally, below and behind (posteroinferior) the cribriform plate, sloping down at an angle, is the bony face of the sphenoid sinus.
== Overview == NAD⁺ is a ubiquitous enzyme cofactor that functions as a carrier of hydride ions in metabolic oxidation-reduction reactions. It also serves as a source of activated adenosine monophosphate (AMP) for adenylation reactions and as a precursor of ADP-ribose. Because of NAD⁺'s essential role in cellular metabolism, bacteria must carefully regulate genes involved in both the de novo biosynthesis and salvage (recycling) of NAD⁺ and its many derivatives. Two classes of NAD riboswitches have been identified: NAD-I and NAD⁺-II.
Sources: en.wikipedia.org
The defeat of the Russian armies forced Vladimir Lenin and the Soviet leadership to postpone their strategic objective of linking up with the German and other European revolutionary leftist collaborators to spread communist revolution. Lenin also hoped for generating support for the Red Army in Poland, which failed to materialize. Piłsudski's seizure of Vilnius in October 1920 (known as Żeligowski's Mutiny) was a nail in the coffin of the already poor Lithuania–Poland relations that had been strained by the Polish–Lithuanian War of 1919–1920; both states would remain hostile to one another for the remainder of the interwar period. Piłsudski's concept of Intermarium (an East European federation of states inspired by the tradition of the multiethnic Polish–Lithuanian Commonwealth that would include a hypothetical multinational successor state to the Grand Duchy of Lithuania) had the fatal flaw of being incompatible with his assumption of Polish domination, which would amount to an encroachment on the neighboring peoples' lands and aspirations. At the time of rising national movements, the plan thus ceased being a feature of Poland's politics.[a] A larger federated structure was also opposed by Dmowski's National Democrats. Their representative at the Peace of Riga talks, Stanisław Grabski, opted for leaving Minsk, Berdychiv, Kamianets-Podilskyi and the surrounding areas on the Soviet side of the border.
...Power Preponderance is going to replace balance-of-power neorealism and become the dominant brand of American Realism for the foreseeable future. Unipolarity is too central of a problem for neorealism to finesse, especially as confident predictions of its early demise have been proven wrong and the gap between the US and other rivals continues to grow. Expecting anti-American balancing, Waltz drew a much-cited analogy: "As nature abhors vacuum, so international politics abhors unbalanced power." Craig paraphrased:
== External links == Overview of all the structural information available in the PDB for UniProt: P06241 (Human Tyrosine-protein kinase Fyn) at the PDBe-KB. Overview of all the structural information available in the PDB for UniProt: P39688 (Mouse Tyrosine-protein kinase Fyn) at the PDBe-KB.
=== Transitioning to commercial release (2013–2014) === A new version of the Source engine had been introduced by 2013 that, in addition to new engine features, included support for OS X and Linux platforms. However, developers had to pay to gain access to the full feature set of this engine. According to Adam Engels, the project lead at the completion of Black Mesa, Valve approached their team around this time and suggested making Black Mesa a commercial release and, thus, getting a license to the Source engine. The team considered this option, and, since access to the full Source engine would help make Black Mesa the best game they could, opted to go the commercial route to be able to pay for that license, not having originally intended to profit from the game. By November 2013, the team had affirmed that they had gotten Valve's permission to sell the game. Some of the team were later invited to Valve's offices in Bellevue, Washington in 2015. At this point in 2013, the team cautioned that a final version was still some distance away, as they were still dealing with the updated Source engine, and they had not yet done much with Xen. Crowbar Collective continued to offer the free version of Black Mesa, based on the earlier Source engine, on their website. With the new Source engine, the team started to look more closely at how Valve had used Source in Half-Life 2, compared to what they had done in the original Half-Life, and developed changes for Black Mesa that reflected what they believed were Valve's design principles in Half-Life 2.
== See also == Carcinoid syndrome Don Meyer, head coach emeritus of the Northern State University men's basketball team. Meyer was found to have carcinoid cancer following an automobile accident in September 2009. Derrick Bell, professor and legal scholar, died of carcinoid cancer on October 5, 2011.
Sources: en.wikipedia.org
=== General Information about the Museum === Timings: 10 am to 7 pm (Monday to Friday) Closed: Saturday, Sunday, and All Gazetted Holidays Entry: Free Photography: Allowed Videography: After prior permission of the Competent Authority
Research suggests that graphene filters could outperform other techniques of desalination by a significant margin. In 2021, researchers found that a reusable graphene foam could efficiently filter uranium (and possibly other heavy metals such as lead, mercury and cadmium) from water at the rate of 4 grams of uranium/gram of graphene.
=== 2007 === Reconstitution of a Cambodian traditional wood kiln 40 000 Litres. This kiln has mobilized 15 people for two months + 5000h work. The original kiln has been discovered at Phnom Kulen. 1st International Khmer Ceramics festival & Conference. The conference is held at the CKS center for Khmer study.
== Function == Glutathione synthetase is important for a variety of biological functions in multiple organisms. In Arabidopsis thaliana, low levels of glutathione synthetase have resulted in increased vulnerability to stressors such as heavy metals, toxic organic chemicals, and oxidative stress. The presence of a thiol functional group allows its product GSH to serve both as an effective oxidizing and reducing agent in numerous biological scenarios. Thiols can easily accept a pair of electrons and become oxidized to disulfides, and the disulfides can be readily reduced to regenerate thiols. Additionally, the thiol side chain of cysteines serve as potent nucleophiles and react with oxidants and electrophilic species that would otherwise cause damage to the cell. Interactions with certain metals also stabilize thiolate intermediates. In humans, glutathione synthetase functions in a similar manner. Its product GSH participates in cellular pathways involved in homeostasis and cellular maintenance. For instance, glutathione peroxidases catalyze the oxidation of GSH to glutathione disulfide (GSSG) by reducing free radicals and reactive oxygen species such as hydrogen peroxide. Glutathione S-transferase uses GSH to clean up various metabolites, xenobiotics, and electrophiles to mercapturates for excretion. Because of its antioxidant role, GSS mostly produce GSH inside the cytoplasm of liver cells and imported to mitochondria where detoxification occurs. GSH is also essential for the activation of the immune system to generate robust defense mechanisms against invading pathogens.
==== Lorcaserin ==== Lorcaserin is the only agent that has completed phase III clinical trials, and achieved US Food and Drug Administration (FDA) approval. However it was later withdrawn from the market in February 2020 due to a higher risk of malignancy in a randomized trial of lorcaserin. Previously approved agents were subsequently removed from the US market. Lorcaserin is a full agonist for 5-HT2C and 5-HT2B receptors and partial agonist for 5-HT2A receptors (75% of the maximal response elicited by serotonin). Lorcaserin is a potent and selective 5-HT2C agonist with rapid oral absorption that shows dose-dependent decrease in food intake and body weight. Lorcaserin affects body weight by producing a negative energy balance through reduced food intake (energy intake) without alterations in energy expenditure and substrate oxidation. Lorcaserin has a high affinity for the 5-HT2C receptors, with 18-fold selectivity over 5-HT2A receptors and 104-fold over 5-HT2B receptors. The predicted blood concentration to stimulate 2A and 2B receptors is approximately 1400-fold for 2B and 250-fold for 2A, above the blood concentration that is required to stimulate the 2C receptors. This functional selectivity is critical to prevent potential side effects and suggests that the theoretical risk of cardiac valvulopathy is very low. Clinical trials have supported this theory since they have not revealed any side effects on heart valves or pulmonary artery pressure like the former obesity drugs.
Sources: en.wikipedia.org
No. Cardarine is GW501516, a PPARδ agonist, while SARMs act on androgen receptors. The two classes are often grouped in informal discussions despite different mechanisms.
No. It has no approved medical indication in any country. Regulatory agencies have not cleared it for treatment or prevention of any condition.
Early clinical work stopped after rodent carcinogenicity findings. Those animal results raised concerns about long-term human risk, although direct human evidence is lacking. The human relevance of the tumors remains an open scientific question.
It binds and activates PPARδ, a nuclear receptor that influences gene expression related to fatty acid metabolism and energy balance. This mechanism has been studied mainly in animals and cell models, not established as a safe human therapy.