A practical reference on nuclear receptor: what it is, how it behaves, what the literature reports, and where the honest uncertainties sit.
Reviewed 2025-09-09. Anything still debated is marked as such rather than presented as settled.
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.
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.
| Property | Value | Notes |
|---|---|---|
| CAS Registry Number | 317318-70-0 | Unique identifier for the compound. |
| Chemical class | PPARδ agonist | Synthetic ligand for peroxisome proliferator-activated receptor delta. |
| Appearance | White to off-white solid | Typical form of research-grade material. |
| Solubility | Soluble in DMSO and ethanol | Poorly soluble in water. |
| Typical storage | -20°C | Recommended for long-term storage of stock solutions. |
Anti-doping laboratories identify GW501516 and its metabolites using liquid chromatography-tandem mass spectrometry. Urine is the usual matrix, and detection can occur after the parent compound has cleared from blood. The exact detection window depends on dose, formulation, individual metabolism, and assay sensitivity. Because the compound is prohibited at all times, athletes are subject to testing in and out of competition. Analytical methods continue to improve as new metabolites and designer analogs are characterized.
GW501516 acts as a ligand for PPAR delta, a nuclear receptor that regulates transcription of genes involved in fatty acid oxidation and energy use. Activation of this receptor in skeletal muscle shifts metabolism toward fat burning in animal models. The compound does not burn fat directly; it changes gene expression over hours to days. Researchers study it to understand metabolic flexibility and exercise adaptation. Effects observed in rodents are not automatically expected in humans.
Preclinical research reported that GW501516 increased running endurance in mice and improved lipid profiles in some animal species. Early human trials explored effects on high-density lipoprotein cholesterol, triglycerides, and glucose handling, but the program was discontinued. Published human data are sparse and do not establish efficacy for any condition. Studies also examined PPAR delta in cancer biology, with conflicting findings across models. The relationship between receptor activation, tissue context, and disease risk remains an active area of investigation.
Anti-doping laboratories identify GW501516 and related metabolites using liquid chromatography coupled with tandem mass spectrometry. Urine is the most common matrix, though blood and dried blood spots may also be analyzed. The method targets the parent compound and phase I and phase II metabolites, which extend the detection window. Because the substance is prohibited at all times, athletes can be tested outside competition. Detection limits and windows depend on the assay, sample type, and individual metabolism.
Cardarine is frequently described as a fat-burning or endurance-enhancing supplement, but these claims exceed the available evidence. The compound is not a hormone, steroid, or selective androgen receptor modulator. Research articles discuss it as a tool compound for studying PPARδ biology, while anti-doping literature focuses on its abuse and detection. Quality of unapproved products is uncertain, and independent analyses have found impurities or incorrect labeling. Open questions include whether human cancer risk resembles that seen in rodents and how often non-athletes use the substance.
Found ineffective for Sleep apnea/hypopnea Secondary symptoms of autistic spectrum conditions and other pervasive developmental disorders Antipsychotic-induced akathisia. Drug withdrawal, dependence and detoxification Negative, depressive and cognitive symptoms of schizophrenia (as an adjunct) A case report has been published in which mirtazapine reduced visual hallucinations in a patient with Parkinson's disease psychosis (PDP). This is in alignment with recent findings that inverse agonists at the 5-HT2A receptors are efficacious in attenuating the symptoms of Parkinson's disease psychosis. As is supported by the common practice of prescribing low-dose quetiapine and clozapine for PDP at doses too low to antagonize the D2 receptor, but sufficiently high doses to inversely agonize the 5-HT2A receptors. Eight case reports have been reported in five papers on the use of mirtazapine in the treatment of hives as of 2017. Mirtazapine to alleviate severe breathlessness in patients with COPD or interstitial lung diseases (BETTER-B). Found ineffective and potentially harmful.
Donkey milk has been used by humans for alimentary and cosmetic purposes since Egyptian antiquity. Doctors recommended it to treat several afflictions because of its supposed healing and cosmetic virtues. Hippocrates (460–370 BC) was the first to write of the medicinal use of donkey milk and prescribed it for numerous conditions, including poisoning, fevers, infectious diseases, edema, wounds, nose bleeds, and liver trouble. In the Roman era, donkey milk was a recognized remedy; Pliny the Elder (23–79 AD) in his encyclopedic work, Naturalis Historia, wrote extensively about its health benefits, i.e. to fight fever, fatigue, eye strain, weakened teeth, face wrinkles, poisonings, ulcerations, asthma, and certain gynecological troubles. However, it was not until the Renaissance that the first real scientific consideration was given to donkey milk. Georges-Louis Leclerc the Comte de Buffon (1707–1788) mentions the benefits of donkey milk in his Histoire naturelle and Pauline Bonaparte (1780–1825), Napoleon's sister, is reported to have used donkey milk for skin care. In France in the nineteenth century, Dr. Parrot of the Hospital des Enfants Assistés spread the practice of bringing motherless babies directly to the donkey's nipple (Bulletin de l’Académie de médicine, 1882). Donkey's milk was sold until the twentieth century to feed orphaned infants and to cure delicate children, the sick, and the elderly. For this reason, there were many donkey farms in Italy, Belgium, Germany, and Switzerland.
These lacteals drain into the thoracic duct which empties into the venous blood at the junction of the left jugular and left subclavian veins on the lower left hand side of the neck. This means that the fat-soluble products of digestion are discharged directly into the general circulation, without first passing through the liver, unlike all other digestion products. The reason for this peculiarity is unknown.
Bernoulli's principle states that within a flow of constant energy, when fluid flows through a region of lower pressure it speeds up and when it flows through a region of higher pressure it slows down. Thus, Bernoulli's principle quantifies changes in speed and changes in pressure within a flow field. Bernoulli's equation is derived by considering the forces or energy along a streamline, but it can also be applied to a flow field where all the streamlines come from a region of uniform velocity and pressure. It cannot be used to compare different flow fields, for example comparing a plume or jet of air with the surrounding stationary air. (See this example below). Fluid particles are subject only to pressure and their own weight. If a fluid is flowing horizontally, when its speed increases it can only be because the fluid on that section has moved from a region of higher pressure to a region of lower pressure; and if its speed decreases, it can only be because it has moved from a region of lower pressure to a region of higher pressure. Consequently, within a fluid flowing horizontally, the highest speed occurs where the pressure is lowest, and the lowest speed occurs where the pressure is highest. Bernoulli's principle is only applicable for isentropic flows: when the effects of irreversible processes (like turbulence) and non-adiabatic processes (e.g. thermal radiation) are small and can be neglected. The simple form of Bernoulli's equation is valid for incompressible flows (e.g. most liquid flows and gases moving at low Mach number).
Sources: en.wikipedia.org
== Medicinal properties == Mashua has putative anaphrodisiac effects. It has been recorded by the Spanish chronicler Cobo that mashua was fed to their armies by the Inca Emperors, "that they should forget their wives". Studies of male rats fed on mashua tubers have shown a 45% drop in testosterone levels due to the presence of isothiocyanates. Mashua contains docosatetraenoylethanolamide, a cannabinoid structurally similar to anandamide that also acts on the cannabinoid (CB1) receptor among other structurally related compounds such as N–oleoyldopamine. Topical mashua in a 1% gel formulation has proven to increase the healing activities of open wounds in mice populations. Further studies are necessary to determine potential wound healing success for human application.
Similar to travel agents, wire service affiliates' main functions are to act as agents and sell products and services on behalf of local florist suppliers. Unlike other retail businesses, sellers are not required to keep stock on hand. A flower arrangement or other floral gift is not purchased from a supplier unless a customer requests the item. The flowers or other floral gift are supplied to them at a discount. The profit is therefore the difference between the advertised price which the customer pays and the discounted price at which it is charged to the agent. This is known as the commission. A wire service affiliate selling agent typically earns 20% of the product and local delivery price, plus services charges. Additionally, many florist wire services pay performance rebates to affiliate resellers. Twenty-four states in the USA have now outlawed geographic misrepresentation by floral product sellers in Yellow Pages and in online advertising.National floral marketplaces such as BloomNation offer an alternative to the wire services.
Potential fields of BSG application include ultra-sensitive detectors, high-performance catalytic cells, nanochannels for DNA sequencing and manipulation, high-performance heat sinking surfaces, rechargeable batteries of enhanced performance, nanomechanical resonators, electron multiplication channels in emission Nano-electronic devices, high-capacity sorbents for safe hydrogen storage. Three dimensional bilayer graphene has also been reported.
=== Viral infections === Increased blood CRP levels were higher in people with avian flu H7N9 compared to those with H1N1 (more common) influenza, with a review reporting that severe H1N1 influenza had elevated CRP. In 2020, people infected with COVID-19 in Wuhan, China, had elevated CRP.
== Notable achievements and awards == In 1996, Kessler became a member of the Bavarian Academy of Sciences and Humanities, one of the eight state academies in Germany. In 2002, he was elected to membership of the Academy of Sciences Leopoldina, the national academy of Germany.
Sources: en.wikipedia.org
Inguinal hernias, in turn, belong to groin hernias, which also includes femoral hernias. A femoral hernia is not via the inguinal canal, but via the femoral canal, which normally allows passage of the common femoral artery and vein from the pelvis to the leg. In Amyand's hernia, the content of the hernial sac is the appendix.
government study conducted by the Substance Abuse and Mental Health Services Administration concluded that, in the US, benzodiazepines are recreationally the most frequently used pharmaceuticals due to their widespread availability, accounting for 35% of all drug-related visits to hospital emergency and urgent care facilities. Men and women are equally likely to use benzodiazepines recreationally. The report found that alprazolam is the most common benzodiazepine for recreational use, followed by clonazepam, lorazepam, and diazepam. The number of emergency department visits due to benzodiazepines increased by 36% between 2004 and 2006.
== January 25, 1982 (Monday) == In a speech in Asmara, Ethiopia's President Mengistu Haile Mariam announced his "Red Star Campaign", a military operation to destroy the Eritrean People's Liberation Front and the Tigray People's Liberation Front secessionist groups in Eritrea Province. The campaign would begin on February 15, 1982, and last for almost five months, until July 5, with at least 10,000 Ethiopian and 4,000 Eritrean soldiers killed. Propaganda Due (P2), the controversial Italian Masonic lodge, was formally dissolved after 105 years of operation. The Amol uprising, an unsuccessful rebellion by Siamak Zaim of the League of Iranian Communists, was launched against the Islamic Republic government in Iran's Mazandaran province. The R. E. Ginna Nuclear Power Plant near Ontario, New York in the U.S. sustained a nuclear accident when a tube on a steam generator ruptured and radioactive steam was released for 93 minutes before the problem was fixed. Born: Heather Hardy, enshrinee in the International Women's Boxing Hall of Fame as world female featherweight champion of the World Boxing Organization from 2018 to 2019; in Brooklyn, New York City Died: Mikhail Suslov, 79, Deputy General Secretary of the Soviet Communist Party and the Party's second only to General Secretary and President Leonid Brezhnev. William Russel Huber, 79, U.S. Navy sailor and recipient of the Medal of Honor Mildred Christman, 86, American rodeo bronco riding champion, trick rider, and actress
=== Palliative care === Palliative care is specialized medical care that focuses on providing patients with relief from the symptoms, pain, and stress of a serious illness, such as cirrhosis. The goal of palliative care is to improve quality of life for both the patient and the patient's family, and it is appropriate at any stage and for any type of cirrhosis. Especially in the later stages, people with cirrhosis experience significant symptoms such as abdominal swelling, itching, leg edema, and chronic abdominal pain, which would be amenable to treatment through palliative care. Because the disease is not curable without a transplant, palliative care can also help with discussions regarding the person's wishes concerning health care power of attorney, do not resuscitate decisions and life support, and potentially hospice. Despite proven benefit, people with cirrhosis are rarely referred to palliative care.
Sources: en.wikipedia.org
Cardarine is a common name for GW501516, a synthetic PPARδ agonist developed for research. It has not been approved as a medication in any country. It is classified as an unapproved drug and a prohibited substance in sport.
No. Cardarine is not an anabolic steroid; it belongs to a different chemical class that targets PPARδ. Steroids act primarily through androgen receptors, while cardarine acts through a nuclear receptor involved in metabolism.
Some rodent studies reported increased endurance and changes in fat metabolism after cardarine exposure. Long-term studies in animals also raised concerns about cancer in certain tissues. Human trial data are limited, so these findings cannot be directly translated to people.
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.