If you have been reading about fatty acid oxidation and want a single page that covers the useful parts, this is it: definitions, context, how it is studied, and the questions that come up repeatedly.
Updated 2026-01-24. Numbers and descriptions here follow the published literature rather than marketing material.
Cardarine is a synthetic compound also known as GW501516, GW-501516, and sometimes endurobol. It was developed as a selective agonist of peroxisome proliferator-activated receptor delta, a nuclear receptor involved in fatty acid oxidation and energy metabolism. The compound was studied in preclinical models for metabolic and cardiovascular conditions, but it did not become a marketed human medicine. In regulatory and anti-doping contexts, it is treated as a prohibited substance rather than a licensed medicine.
The pharmacological interest in cardarine centers on PPARδ activation and its downstream effects on lipid handling and mitochondrial function. In animal studies, PPARδ agonists have been associated with changes in exercise endurance and fatty acid utilization, though results vary by model and protocol. Human data remain sparse, and the absence of large controlled trials limits conclusions about efficacy. Researchers often describe the compound as a tool for probing PPARδ biology rather than a proven therapeutic agent.
Safety discussions about cardarine frequently cite rodent carcinogenicity findings reported in the 2000s. In those studies, treated animals developed tumors at multiple sites, leading sponsors to discontinue clinical development. The relevance of these findings to humans has not been resolved, but they are a major reason the compound is not approved. Current literature emphasizes uncertainty about long-term effects and the risks of unregulated use. Regulators and health agencies have not established a safe human exposure level.
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.
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.
| Property | Value | Notes |
|---|---|---|
| Common synonyms | GW501516, GW-501516, GW 501516, endurobol | Names vary in research and anti-doping documents. |
| Chemical class | Synthetic PPARδ agonist | Small-molecule nuclear receptor ligand. |
| CAS Registry Number | 317318-70-0 | Identifier commonly associated with GW501516. |
| Appearance | White to off-white powder | Typical for purified research material. |
| Solubility | Low in water; soluble in DMSO and ethanol | Organic solvents are common for laboratory stock solutions. |
In laboratory settings, cardarine is studied as a tool compound for probing PPARδ biology. Published experiments often use cell cultures, rodent models, or isolated tissues. Some investigations focus on metabolic effects, while others assess potential risks such as carcinogenicity observed in long-term animal studies. Because human trials are sparse, most knowledge comes from preclinical work and adverse event reports. Scientific literature frequently notes the gap between animal findings and human outcomes. The compound is not a dietary supplement and is not intended for human consumption.
Cardarine is a common name for GW501516, a synthetic compound developed in the 1990s through research collaborations involving GlaxoSmithKline. It belongs to a class of molecules known as peroxisome proliferator-activated receptor delta agonists. Early studies explored its effects on lipid metabolism and energy expenditure in animal models. The compound was never approved as a human medicine, and clinical development was discontinued. In the years since, it has appeared in fitness and bodybuilding communities as a performance-enhancing substance. Regulatory agencies classify it as an unapproved drug.
PPARδ is a nuclear receptor that regulates gene expression related to fatty acid oxidation, glucose homeostasis, and mitochondrial function. GW501516 binds to this receptor with high affinity and activates downstream signaling in skeletal muscle and other tissues. Animal studies reported increased endurance and altered fuel preference, but human data remain limited and inconsistent. The precise relationship between receptor activation and observed physiological changes is still an area of active investigation. Researchers have also examined whether the compound affects inflammation or cell proliferation. No approved therapeutic indication exists for cardarine.
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.
On a specific kind of patient At varying dosages For a new indication Evaluation for improved efficacy in treating a condition as compared to the standard therapy for that condition Evaluation of the study drug or device relative to two or more already approved/common interventions for that condition While most clinical trials test one alternative to the novel intervention, some expand to three or four and may include a placebo. Except for small, single-location trials, the design and objectives are specified in a document called a clinical trial protocol. The protocol is the trial's "operating manual" and ensures all researchers perform the trial in the same way on similar subjects and that the data is comparable across all subjects. In 2025 the SPIRIT group released 'SPIRIT 2025', an updated guideline for trial protocols that provides a 34-item minimum checklist, adds a new open-science section, strengthens guidance on reporting harms and intervention/comparator descriptions, and includes a new item on patient and public involvement As a trial is designed to test hypotheses and rigorously monitor and assess outcomes, it can be seen as an application of the scientific method, specifically the experimental step. The most common clinical trials evaluate new pharmaceutical products, medical devices, biologics, diagnostic assays, psychological therapies, or other interventions. Clinical trials may be required before a national regulatory authority approves marketing of the innovation.
7-PET is an opioid analgesic drug that has 300 times the potency of morphine by weight. It was discovered by K.W. Bentley and is related to the more well known oripavine derivative etorphine, which is used as a veterinary painkiller and anesthetic medication for the sedation of large animals such as elephants, giraffes, and rhinos. 7-PET itself has a 3-O-methyl ether which reduces potency, but the 3-OH derivative is around 2200 times more potent than morphine, almost the same potency as etorphine as a μ agonist, and unexpectedly the 3-hydrogen compound is also around the same potency of 2000 times morphine. Unlike etorphine, 7-PET is not controlled under the UN drug conventions, but it might still be considered to be a controlled substance analogue of etorphine on the grounds of its related chemical structure in some jurisdictions such as the United States, Canada, Australia, and New Zealand.
Serve as a think tank to the government on the subject of cold-chain. NCCD engages with its members to translate industry needs into policy recommendation. Provide an enabling environment for cold chain sector and facilitate private investment for cold-chain infrastructure. Direction setting to narrow the gap in the supply and value chain including storage, specialised transport and operational or business processes. Address the concerns on standards and protocols related to cold-chain testing, verification, certification and accreditation. Assist in developing and promoting new and energy efficient technologies and their adaption in India. Capacity building and training activities to reduce the gap in skilled human resources required for cold-chain sector. Recommend guidelines to minimise environment impact and promote sustainability in the cold-chain. Awareness programs on best practices for perishable product handling, indigenised for specific requirements and conditions. In India, while almost 15% of fruits and vegetables have access to cold storage capacity, less than 5% of such goods are precooled or get transported in the cold-chain. This results in most of the fresh produce being subject to harsh climatic conditions, incurring gross loss of perishable food items. Similar lack of cold-chain in the pharmaceutical sector witnesses increased risk and loss of medical products. Lack of appropriate integrated infrastructure in this sector also increases risk to frozen foods shipments.
==== Copycat suicides and romanticisation ==== Another negative effect that misrepresentation of mental illnesses through the news can cause is copycat suicide. As with the deaths of celebrities Kate Spade and Robin Williams, an abundance of media and news coverage occurs. A Columbia University study revealed that "suicides rose nearly 10% higher than expected in the months following Robin Williams' death in August 2014," especially involving the method used by Robin Williams himself (a 32% increase). These results support the idea of suicide contagion, which the U.S. Department of Health & Human Services (HHS) defines as "the exposure to suicide or suicidal behaviors within one's family, one's peer group, or through media reports of suicide and can result in an increase in suicide and suicidal behaviors." A notable mid-2010s case of modern digital media contagion is the 2015 suicide of 16-year-old Russian student Renata Kambolina (known online under the pseudonym Rina Palenkova). After posting a final trackside selfie with the caption "nya. bye." ("ня.пока."), her tragic death rapidly went viral on the Russian social network VKontakte. This sparked a dangerous wave of romanticisation that falsely framed her as a virtual idol, prompting numerous vulnerable youths to replicate either her final words, her exact photo framing, or both, during their own suicides or attempted suicides—notably Gleb Korablyov in 2019. Like Kambolina, Korablyov also had his tragic death immediately seized upon and mythologised by internet trolls and morbid online communities.
Sources: en.wikipedia.org
Otamahan (おたまはん), developed by Yoshida Furusato Mura (a third-sector company) in Unnan, Shimane (launched 2002). Tamago ni kakeru oshōyu (たまごにかけるお醤油, Soy Sauce for Pouring on Egg), by Teraoka Yuki Jōzō in Fukuyama, Hiroshima. Tamago kake gohan ni kakeru shōyu (玉子かけご飯にかける醤油, Soy Sauce for Pouring on Tamago Kake Gohan), by Hamada Shōyu in Kumamoto. Higeta Tamago kake gohan ni dōzo! (ヒゲタ たまごかけご飯にどうぞ!, Higeta - Please Use for Tamago Kake Gohan!), by Higeta Shōyu in Choshi, Chiba. Tamago ni kakeru dashi shōyu (たまごにかけるだし醤油, Dashi Soy Sauce for Pouring on Egg), by Igagoe Co., Ltd. in Iga, Mie. Kaketarō (かけたろう), by Jinushi Kyōwa Shōkai / Kokekokkō Republic in Taki, Mie. Additionally, specialized furikake seasonings specifically for TKG are also available. Bull-Dog Sauce produced a seasoning mix called Ouchi de Gyūdon-fū Tamago Kake Gohan (おうちで 牛丼風 たまごかけご飯, Gyūdon-Style Tamago Kake Gohan at Home).
In 2009, the first to obtain FDA approval for topical DMSO usage was PENNSAID, which contains diclofenac in a carrier with 45.5% DMSO Each 1 mL of TDiclo contains 16.05 mg diclofenac sodium. TDiclo solution also contains 45.5% dimethyl sulfoxide (DMSO) vehicle, which can result in enhanced penetration of active drug through the skin. The most common adverse event reported was dry skin at the application site (25.3% of patients), followed by contact dermatitis (13.0%)In interventional radiology, DMSO is used as a solvent for ethylene vinyl alcohol in the Onyx liquid embolic agent, which is used in embolization, the therapeutic occlusion of blood vessels. In cryobiology DMSO has been used as a cryoprotectant and is still an important constituent of cryoprotectant vitrification mixtures used to preserve organs, tissues, and cell suspensions. Without it, up to 90% of frozen cells will become inactive. It is particularly important in the freezing and long-term storage of embryonic stem cells and hematopoietic stem cells, which are often frozen in a mixture of 10% DMSO, a freezing medium, and 30% fetal bovine serum. In the cryogenic freezing of heteroploid cell lines (MDCK, VERO, etc.) a mixture of 10% DMSO with 90% EMEM (70% EMEM + 30% fetal bovine serum + antibiotic mixture) is used. As part of an autologous bone marrow transplant the DMSO is re-infused along with the patient's own hematopoietic stem cells. DMSO is metabolized by disproportionation to dimethyl sulfide and dimethyl sulfone. It is subject to renal and pulmonary excretion.
Both enantiomers of alazocine have very low affinity for the sigma σ2 receptor (Ki = 13,694 nM and 4,581 nM for the (+)- and (−)-enantiomers, respectively, in rat brain membranes or rat PC12 cells). As such, due to its high affinity for the σ1 receptor, (+)-alazocine can be used to distinguish between the two sigma receptor subtypes in scientific research, for instance in radioligand binding assays. Taken together, (−)-alazocine is a selective partial agonist of the κ-opioid receptor, antagonist of the μ-opioid receptor, and to a far lesser extent agonist of the δ-opioid receptor with very low affinity for the sigma receptors, while (+)-alazocine is a selective agonist of the sigma σ1 receptor and to a lesser (~10-fold) extent antagonist of the NMDA receptor with low affinity for the opioid and sigma σ2 receptors.
This work led to the first successful sequence-based analysis of the genomes of single cancer cells from tumors by Wigler's then-graduate student Nick Navin, and subsequently, tumor cells in circulation by Wigler's collaborator Jim Hicks. In the early 2000s, Wigler, Jonathan Sebat and Lakshmi Muthuswamy began copy number analysis of healthy individuals, leading to the discovery of a new source of genetic variability, copy number variations or CNVs. The abundance of CNVs in the human genome is a major source of individual variation. The team at CSHL then continued this line of work to demonstrate that spontaneous germ-line mutation is likely to be a major cause for autism. Their observations and theories about autism provide a now widely accepted approach for understanding other human mental and physical abnormalities.
=== Viable analytes === Various compounds, including peptides, dinucleotides, prostaglandins, diquaternary ammonium salts, pesticides, drugs, dyes, and environmental pollutants can be analyzed using thermospray.
Sources: en.wikipedia.org
=== Death fold === Proteins with a death domain (DD), such as PIDD1, are defined by a structural framework consisting of six α-helical bundles, referred to as a 'death fold'. This structure is also present in other proteins that contain domains like the caspase recruitment domain (CARD), death effector domain (DED), pyrin domain (PYD), or combinations of these motifs (e.g., DD/CARD, DD/DED, PYRIN/CARD). These death folds facilitate homotypic protein-protein interactions (such as DD/DD or CARD/CARD), enabling the formation of large multi-protein signaling complexes. Notable examples include the apoptosome, which contains apoptotic protease-activating factor 1 (APAF1) and caspase-9, and the death-inducing signaling complex (DISC) associated with caspase-8 and members of the tumor necrosis factor receptor (TNFR) superfamily.
=== Post B.P.C. Mining === In March 1981, the Phosphate Mining Company of Christmas Island (PMCI), a company established and controlled by the Australian Government, took over mining operations This arrangement lasted until December 1987 when the company was disbanded. The mining operation was then taken over by the Union of Christmas Island Workers.
American biochemist at Rutgers University, known for work on nucleic acids, their interactions with proteins, and also the structure of collagen. Claude Bernard (1813–1878). French physiologist and physician (early biochemist) at the Collège de France, Paris. Introduced concept of homeostasis (given that name by Walter Cannon). Foreign member of the Royal Swedish Academy of Sciences. Carolyn Bertozzi (b. 1966). American chemist known for her work spanning chemistry and biology. Nobel Prize in Chemistry, 2022.
Bananas, like most organic material, naturally contain a certain amount of radioactive isotopes—even in the absence of any artificial pollution or contamination. The banana equivalent dose, defined as the additional dose a person will absorb from eating one banana, expresses the severity of exposure to radiation, such as resulting from nuclear weapons or medical procedures, in terms that would make sense to most people. This is approximately 78 nanosieverts – in informal publications one often sees this estimate rounded up to 0.1 μSv.
The library of oligonucleotides must be extremely diverse and not contain linear, incapable of providing a stable spatial arrangement, and double-stranded structures; due to these limitations, oligonucleotide libraries can cover the diversity of only ~106 sequences. This means that existing aptamers may not fully cover the diversity of target molecules or may not have optimal properties due to limitations of the underlying method. To yield the best possible aptamers one must maximize the effectiveness of the discovery process and the library itself. RNA and DNA secondary structure prediction by dynamic programming algorithms such as RNAfold (ViennaRNA) and by machine learning models such as SPOT-RNA, MXfold2 provides the opportunity to assess the ability of sequences in the primary library to fold into complex structures, allowing for the selection of only the most promising sequences from the entire pool. However, these algorithms are low-performance, making them poorly suited for this task. For this reason, algorithms like Ufold from the University of California and AliNA from Xelari Inc. have been developed, which demonstrate a significant increase in computational speed due to their faster architecture, and can be applied for preliminary in silico analysis of these libraries.
Sources: en.wikipedia.org
Cardarine is an investigational synthetic compound that acts as a PPARδ agonist. It is also known as GW501516 and has been studied mainly in preclinical research. It is not an approved medicine.
No. Cardarine is not a steroid hormone; it targets the nuclear receptor PPARδ. Its classification in anti-doping rules differs from anabolic steroids, though it remains prohibited in sport.
Early rodent studies reported tumor formation at multiple sites, which raised safety concerns. Sponsors stopped clinical development, and no approved human product exists.
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.