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.
Last reviewed on 2026-02-06. Where a claim depends on a specific study, the study is described rather than over-claimed.
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.
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.
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 |
|---|---|---|
| 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. |
Handling and quality assessment of cardarine reference material follow general laboratory practices for poorly characterized compounds. It typically appears as a white to off-white powder and is sparingly soluble in water but soluble in organic solvents such as dimethyl sulfoxide and ethanol. Storage recommendations usually specify a cool, dry, dark place, with long-term storage at low temperature and desiccation. Purity may be checked by high-performance liquid chromatography with ultraviolet detection, while identity is confirmed by mass spectrometry and nuclear magnetic resonance. No pharmacopeial monograph exists, so reported purity and stability depend on the supplier’s methods.
GW501516 acts as a selective agonist at PPARδ, a nuclear receptor that regulates transcription of genes involved in lipid handling and energy metabolism. Activation of PPARδ in preclinical models increases fatty acid oxidation, mitochondrial biogenesis, and exercise endurance in rodents. These effects have made the compound a subject of metabolic research and also a target for sport anti-doping rules. In humans, however, controlled studies are limited, and whether similar endurance or metabolic changes occur at tolerated exposures remains an open question. The receptor’s broad tissue distribution also means downstream effects may vary by organ and condition.
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.
== Reference ranges == General guidelines for diagnosing prolactin excess (hyperprolactinemia) define the upper threshold of normal prolactin at 25 μg/L for women and 20 μg/L for men. Similarly, guidelines for diagnosing prolactin deficiency (hypoprolactinemia) are defined as prolactin levels below 3 μg/L in women and 5 μg/L in men. However, different assays and methods for measuring prolactin are employed by different laboratories and as such the serum reference range for prolactin is often determined by the laboratory performing the measurement. Furthermore, prolactin levels vary according to factors as age, sex, menstrual cycle stage and pregnancy. The circumstances surrounding a given prolactin measurement (assay, patient condition, etc.) must therefore be considered before the measurement can be accurately interpreted. The following chart illustrates the variations seen in normal prolactin measurements across different populations. Prolactin values were obtained from specific control groups of varying sizes using the IMMULITE assay.
The body hair of surgical patients is often removed beforehand on the skin surrounding surgical sites. Shaving was the primary form of hair removal until reports in 1983 showed that it may lead to an increased risk of infection. Clippers are now the recommended pre-surgical hair removal method. A 2021 systematic review brought together evidence on different techniques for hair removal before surgery. This involved 25 studies with a total of 8919 participants. Using a razor probably increases the chance of developing a surgical site infection compared to using clippers or hair removal cream or not removing hair before surgery. Removing hair on the day of surgery rather than the day before may also slightly reduce the number of infections. Some people with trichiasis find it medically necessary to remove ingrown eyelashes. The shaving of hair has sometimes been used in attempts to eradicate lice or to minimize body odor due to the accumulation of odor-causing micro-organisms in hair. In extreme situations, people may need to remove all body hair to prevent or combat infestation by lice, fleas and other parasites. Such a practice was used, for example, in Ancient Egypt. It has been suggested that an increasing percentage of humans removing their pubic hair has led to reduced crab louse populations in some parts of the world.
=== Hindi === Hindi has a finite list of compound words which are based on established grammatical rules of the language. The word commonly cited as the longest in Hindi is लौहपथगामिनीसूचकदर्शकहरितताम्रलौहपट्टिका (lauhapathagāminīsūcakadarśakaharitatāmralauhapaṭṭikā), which consists of 24 consonants and 10 vowel diacritics, making up a total of 34 characters. The word literally means "a green railway warning signboard made of copper-iron". Its plural would be लौहपथगामिनीसूचकदर्शकहरितताम्रलौहपट्टिकाएँ (lauhapathagāminīsūcakadarśakaharitatāmralauhapaṭṭikāẽ), which has an additional vowel and a diacritic. It is a neologism and not in common use. However this word is a direct loan word or borrowing from Sanskrit rather than a Hindi word. A much smaller word borrowed from Sanskrit which is in common use and is also often cited as the longest word is किंकर्तव्यविमूढ़ (kiṁkartavyavimūṛha). It consists of 8 consonants and 5 vowel diacritics, making up a total of 13 characters. The word literally means "confused about what to do", meaning to be bewildered or flabbergasted.
==== Protein purification ==== Knowledge of an enzyme's resistance to high temperatures is especially beneficial in protein purification. In the procedure of heat denaturation, one can subject a mixture of proteins to high temperatures, which will result in the denaturation of proteins that are not thermostable, and the isolation of the protein that is thermodynamically stable. One notable example of this is found in the purification of alkaline phosphatase from the hyperthermophile Pyrococcus abyssi. This enzyme is known for being heat stable at temperatures greater than 95 °C, and therefore can be partially purified by heating when heterologously expressed in E. coli. The increase in temperature causes the E. coli proteins to precipitate, while the P. abyssi alkaline phosphatase remains stably in solution.
Sources: en.wikipedia.org
K84 produces a bacteriocin (agrocin 84) which is an antibiotic specific against related bacteria, including A. tumefaciens. This method, which was successful at controlling the disease on a commercial scale, had the risk of K84 transferring its resistance gene to the pathogenic Agrobacteria. Thus, in the 1990s, a deletion mutant strain based on K84, known as K1026, was created. This strain is just as successful in controlling crown gall as K84 without the caveat of resistance gene transfer.
Flicker noise is electronic noise with a 1/ƒ frequency spectrum; as f increases, the noise decreases. Flicker noise arises from a variety of sources, such as impurities in a conductive channel, generation, and recombination noise in a transistor due to base current, and so on. This noise can be avoided by modulation of the signal at a higher frequency, for example, through the use of a lock-in amplifier.
777 was the owner of low-cost carrier Flair Airlines. In June 2022, the Canadian Transportation Agency ruled that Flair is a Canadian airline and can fly domestically, as 777 owns 25% of the shares and had limited its influence on the board since the beginning of the CTA investigation. On March 11, 2023, Airborne Capital Ltd. seized four of its planes operated by Flair over alleged non-payment. In a press conference, Flair CEO Stephen Jones suggested the seizures were motivated by competitors, and that the airline owed around US$1 million on the leases, and was in the process of making payment when the seizures occurred. The lessor, Airborne alleged that Flair had repeatedly missed payments amounting to several millions of dollars over a period of five months. Flair used other aircraft to continue to operate its schedule. In January 2024, it was reported that the lessors had filed claims at the UK High Court for costs and that there had been outstanding payments of $1.8 million on the four aircraft when notice of default was served. In August 2024, interim CEO Maciej Wilk said that 777's stake in Flair was down to 10% and the company's involvement was mostly as a lender, having no presence in the boardroom.
Under Maher's supervision, the 4th Armoured Division expanded captagon production and trafficking from Syria into a "business model controlled by the regime". In 2022, 90% of all Captagon pills manufactured in Syria exported by drug cartels affiliated with Assad regime arrived at its customer destinations across the world. Although hundreds of millions of pills were intercepted and seized by police forces, these accounted only for 10% of the total Captagon exports of the drug cartels linked to the Assad regime. In 2020, Italian police seized 84 million captagon pills originating from Syrian ports while intercepting a single shipment. In June 2023, US State Department's Bureau of Near Eastern Affairs published a detailed report to the US Congress, elucidating a strategy to eliminate the narcotics production, drug trafficking and drug cartel networks affiliated with the Assad regime and Hezbollah. A joint investigation conducted by Organized Crime and Corruption Reporting Project (OCCRP) and BBC News Arabic published a documentary in June 2023, revealing further details about the activities of regime officials, Ba'athist military commanders and Assad family members in their involvement in Syria's drug cartel. The investigation found that Lebanese criminal and drug kingpin Hassan Daqou collaborated with Syria's Fourth Armoured Division on trafficiking billions of dollars of drugs, under the command of General Ghassan Bilal, the right-hand man of Maher al-Assad. The report also unearthed Hezbollah's close participation in the drug production and smuggling networks.
Xing Qiyi (Chinese: 邢其毅; pinyin: Xíng Qíyì; Wade–Giles: Hsing Ch'i-i) was a Chinese organic chemist who contributed to the total synthesis of bovine insulin, Xing is still well-known nowadays in China as the main editor of a highly-influential organic chemistry textbook. He was a member of China Democratic League since 1952.
Sources: en.wikipedia.org
Azapirones are a class of drugs used as anxiolytics, antidepressants, and antipsychotics. They are commonly used as add-ons to other antidepressants, such as selective serotonin reuptake inhibitors (SSRIs).
== Medical uses == It is used to treat pulmonary arterial hypertension (PAH), pulmonary fibrosis, as well as atherosclerosis. In pediatric practice, prostacyclin is commonly used to mantain patency of the ductus arteriosus. Prostacyclins are given to people with class III or class IV PAH.
== Computational and data analytical methods == Analysing AMR data at scale requires dedicated computational approaches, as routine microbiological data from clinical laboratories can be large, heterogeneous, and subject to varying local standards. Several open-source tools have been developed to support this work. The AMR package for R provides functions for standardising and analysing phenotypical resistance data, including interpretation of MIC and disk diffusion results against EUCAST and CLSI breakpoints, and calculation of resistance rates across patient populations.
Insight – emphasis is on gaining a greater understanding of the motivations underlying one's thoughts and feelings (e.g. psychodynamic therapy) Action – focus is on making changes in how one thinks and acts (e.g. solution focused therapy, cognitive behavioral therapy) In-session – interventions center on the here-and-now interaction between client and therapist (e.g. humanistic therapy, Gestalt therapy) Out-session – a large portion of therapeutic work is intended to happen outside of session (e.g. bibliotherapy, rational emotive behavior therapy) The methods used are also different in regards to the population being served as well as the context and nature of the problem. Therapy will look very different between, say, a traumatized child, a depressed but high-functioning adult, a group of people recovering from substance dependence, and a ward of the state suffering from terrifying delusions. Other elements that play a critical role in the process of psychotherapy include the environment, culture, age, cognitive functioning, motivation, and duration (i.e. brief or long-term therapy).
== Limitations == Although well ordered nanostructures have already been successfully formed from self-assembling peptides, their potential will not be fully fulfilled until useful functionality is incorporated into the structures. Moreover, so far most of the peptide structures formed are in one or two dimensions. In contrast, in nature, most biological structures are in three dimensions. Criticism has come because there is a lack of theoretical knowledge about the self-assembling behaviours of peptides. Further knowledge could prove to be very useful in facilitating rational designs and precise control of the peptide assemblies. Lastly, although an extensive amount of work is being conducted on developing self-assembling peptide-related applications, issues such as commercial viability and processability have not been paid the same amount of attention. Yet these issues must be assessed if further useful applications are to be realized.
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.
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.