unapproved substance comes up often in conversation and rarely with the context attached. Here we lay out the basics in order, then work through the practical considerations.
Updated 2025-12-14. Numbers and descriptions here follow the published literature rather than marketing material.
Published studies have examined GW501516 in animal models of obesity, insulin resistance, and exercise endurance. Early human trials reportedly ended, and development was discontinued after preclinical findings raised concerns about cancer in some rodent studies. Regulatory agencies have not approved cardarine for any medical use. Its availability through non-pharmaceutical channels raises questions about identity, purity, and legal status that are separate from its laboratory pharmacology. Those questions are often addressed through analytical testing rather than assumptions about product labels.
Cardarine is a common name for GW501516, also GW-1516, a synthetic compound developed as a peroxisome proliferator-activated receptor delta (PPARδ) agonist. It belongs to a class of agents that modulate gene transcription related to lipid and energy metabolism. The compound was studied in preclinical and early clinical research for metabolic and cardiovascular conditions, but it did not progress to approved therapeutic use. Its name appears in fitness and sports contexts despite not being approved as a drug.
PPARδ is a nuclear receptor that influences transcription of genes involved in fatty acid oxidation, lipid transport, and energy homeostasis. GW501516 binds and activates this receptor with high selectivity relative to PPARα and PPARγ in laboratory assays. Activation alters expression of target genes in skeletal muscle, liver, and adipose tissue in animal models. The exact clinical consequences of these changes in humans remain incompletely characterized, and observed effects in animals do not establish therapeutic benefit or safety.
Sporting authorities added GW501516 to prohibited lists after it appeared in athlete samples and online markets. The World Anti-Doping Agency classifies it as a hormone and metabolic modulator, and its use can lead to an anti-doping rule violation. Some early laboratory work suggested effects on fatty acid oxidation and endurance-related metabolism in animals, but those findings do not establish safe or effective use in people. Reports of adverse events in humans are scarce and often anecdotal, which complicates risk assessment.
Legal status varies by country. In some places, cardarine is controlled under medicines or psychoactive substances laws; in others, it may be sold with minimal oversight as a research chemical. Customs agencies have intercepted shipments, and several national health agencies have issued warnings about products marketed for bodybuilding or performance enhancement. The lack of a standardized pharmaceutical supply means identity, purity, and contamination levels can differ widely between samples. These factors make cardarine a regulatory and public health concern rather than a conventional prescription drug.
| Property | Value | Notes |
|---|---|---|
| Chemical class | PPARδ agonist | Not an anabolic steroid. |
| Common synonyms | GW501516, GW-1516 | Cardarine is an informal name. |
| Appearance | White to off-white powder | Typical for research-grade solid. |
| Solubility class | Poorly soluble in water; soluble in some organic solvents | Such as DMSO or ethanol in laboratory settings. |
| Typical storage temperature | Cool, dry, protected from light | Specific conditions vary by supplier and form. |
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.
Cardarine has no approved therapeutic indication and is not marketed as a medicine. The World Anti-Doping Agency lists GW501516 as a prohibited substance at all times, covering both in-competition and out-of-competition periods. National laws vary: some countries treat it as an unapproved drug subject to import controls, while others have specific restrictions on sale for human consumption. It is often sold as a research chemical, a label that does not imply safety or legality. Enforcement actions have targeted online vendors and shipments.
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.
The 1848 appointment of Lord Dalhousie as the Governor General of the East India Company set the stage for changes essential to a modern state: consolidating and demarcating sovereignty, monitoring the population through censuses, educating citizens and rationalising the beauraucracy. Technological advancements—among them, railways, canals, and the telegraph—were introduced within years of their introduction in Europe, with the East India Company guaranteeing fixed financial returns to attract British private investors. Simultaneously, the proponents of these public works lobbied the British government for support, presenting them as necessities for military logistics and security and Indian social and cultural reform. Thus, the Upper Doab's Ganges Canal—conceived by Proby Cautley under Lord Auckland and completed under Dalhousie—was promoted to Company's Court of Directors in London as both a vital relief response to the Agra famine of 1837–1838 and a revenue-generating irrigation and navigation project. The canal, which brought agricultural prosperity to some areas, ultimately caused soil salinisation in others. Disaffection with the company also grew during this time, culminating in the Indian Rebellion of 1857, which swept across the central Gangetic plain, and extended into Central India. Shaking the foundations of Company rule, the uprising was provoked by diverse resentments and perceptions, including invasive British-style social reforms, harsh land taxes, and summary treatment of some wealthy landowners and princes.
== Culinary uses == The bark is used to prepare a spirit from sugar and palm juice, and in times of scarcity it is ground and mixed with flour. The pods are used as a vegetable, and the seeds can be ground and mixed with flour.
==== Robust transport networks ==== According to FAO, robust transport networks can prevent or limit increases in travel time – and consequent impacts on food costs – when an adverse event limits or prevents access to critical network links. For example, flooding, whether from flash floods or from longer-term stagnant flooding, reduces the connectivity of any transport network, impacting the movement of people, goods and societal functioning in general. Damage from flooding can indirectly affect larger areas for a longer period of time, such as when there are traffic delays and congestion on alternative routes, increased journey distances/durations, increased fuel consumption and associated greenhouse gas (GHG) emissions. Due to climate change, transport networks are increasingly being exposed to extreme weather events. A study on the transport networks of 90 countries finds that where food is transported more locally and where the network is denser – such as in high-income countries and densely populated countries like China, India, Nigeria and Pakistan –, systematic disturbances have a much lower impact. Conversely, low-income countries have much lower levels of transport network resilience, although some exceptions exist. The study further simulates the effect of potential disruptions – namely floods – to food transport networks which illustrate that the loss of network connectivity that results when links become impassable potentially affects millions of people.
Sperm is introduced into the recipient by means of artificial insemination or by IVF. The most common technique is conventional artificial insemination which consists of a catheter to put the sperm into the vagina where it is deposited at the entrance to the cervix. In biological terms, this is much the same process as when semen is ejaculated from the penis during sexual intercourse. Owing to its simplicity, this method of insemination is commonly used for home and self inseminations principally by single women and lesbians. Other types of uses include intrauterine insemination (IUI) and deep intrauterine artificial insemination where 'washed' sperm must be used. These methods of insemination are most commonly used in fertility centers and clinics mainly because they produce better pregnancy rates than ICI insemination especially where the woman has no underlying fertility issues.
Sources: en.wikipedia.org
Castor oil is still used for labor induction in environments where modern drugs are not available; a review of pharmacologic, mechanical, and "complementary" methods of labor induction published in 2024 by the American Journal of Obstetrics and Gynecology stated that castor oil's physiological effect is poorly understood but "given gastrointestinal symptomatology, a prostaglandin mediation has been suggested but not confirmed." According to Drugs in Pregnancy and Lactation: A Reference Guide to Fetal and Neonatal Risk (2008), castor oil should not be ingested or used topically by pre-term pregnant women. There is no data on the potential toxicity of castor oil for nursing mothers. There is no high-quality research proving that ingestion of castor oil results in cervical ripening or induction of labor; there is, however, evidence that taking it causes nausea, vomiting, and diarrhea. A systematic review of "three trials, involving 233 women, found there has not been enough research done to show the effects of castor oil on ripening the cervix or inducing labour or compare it to other methods of induction. The review found that all women who took castor oil by mouth felt nauseous. More research is needed into the effects of castor oil to induce labour."
Sipagladenant (INNTooltip International Nonproprietary Name; developmental code name KW-6356) is a non-xanthine selective antagonist or inverse agonist of the adenosine A2A receptor that was previously under development by Kyowa Kirin as a monotherapy and adjunctive to levodopa therapy in Parkinsonism. It reached phase 2 clinical trials prior to the discontinuation of its development in 2022.
Insulinoma A tumor of the beta cells in areas of the pancreas called the islets of Langerhans. Although not usually cancerous, such tumors may cause the body to make extra insulin and may lead to a blood glucose (sugar) level that is too low. Intermittent claudication Pain in the muscles of the leg that occurs off and on, usually while walking or exercising, and results in lameness (claudication). The pain results from a narrowing of the blood vessels feeding the muscle. Drugs are available to treat this condition. Intensive management or Intensive insulinotherapy Intramuscular injection Putting a fluid into a muscle with a needle and syringe. Intravenous injection Putting a fluid into a vein with a needle and syringe. Islet cell Transplantation Moving the beta (islet) cells from a donor pancreas and putting them into a person whose pancreas has stopped producing insulin. The beta cells make the insulin that most cells in the human body require to absorb glucose from the blood. Transplanting islet cells may one day help many people with diabetes, and the procedure is currently in the experimental stage. Islets of Langerhans Groups of cells in the pancreas. Some of them make and secrete hormones that help the body break down and use food. They were noticed by Paul Langerhans, a German medical student, in 1869; these clusters throughout the pancreas serve several functions.
A laboratory study on rats produced by the Armed Forces Radiobiology Research Institute showed that, after a study period of 6 months, rats treated with depleted uranium coming from implanted pellets, comparable to the average levels in the urine of Desert Storm veterans with retained DU fragments, had developed a significant tendency to lose weight with respect to the control group. Substantial amounts of uranium were accumulating in their brains and central nervous systems, and showed a significant reduction of neuronal activity in the hippocampus in response to external stimuli. The conclusions of the study show that brain damage from chronic uranium intoxication is possible at lower doses than previously thought. Results from computer-based neurocognitive tests performed in 1997 showed an association between uranium in the urine and "problematic performance on automated tests assessing performance efficiency and accuracy." A 2021 report concluded that uranium from exploding munitions did not lead to Gulf War illness (GWI) in veterans deployed in the 1991 Persian Gulf War. The study found no differences in secretion of uranium isotopic ratios from those meeting the standard-case definitions of GWI and control veterans without GWI. The researchers say that the most likely remaining causes for GWI are widespread low-level exposure to sarin nerve gas released by the destruction of Iraqi chemical weapons storage facilities in January 1991.
== Diagnosis == In order to assess lactose intolerance, intestinal function is challenged by ingesting more dairy products than can be readily digested. Clinical symptoms typically appear within 30 minutes, but may take up to two hours, depending on other foods and activities. Substantial variability in response (symptoms of nausea, cramping, bloating, diarrhea, and flatulence) is to be expected, as the extent and severity of lactose intolerance varies among individuals. The next step is to determine whether it is due to primary lactase deficiency or an underlying disease that causes secondary lactase deficiency. Physicians should investigate the presence of undiagnosed celiac disease, Crohn's disease, or other enteropathies when secondary lactase deficiency is suspected and infectious gastroenteritis has been ruled out. Lactose intolerance is distinct from milk allergy, an immune response to cow's milk proteins. They may be distinguished in diagnosis by giving lactose-free milk, producing no symptoms in the case of lactose intolerance, but the same reaction as to normal milk in the presence of a milk allergy. A person can have both conditions. If positive confirmation is necessary, four tests are available.
Sources: en.wikipedia.org
After Cuenca, where they attended bullfights, the travelers proceeded to Loja to study the cinchona tree, the source of quinine. They spent nearly three weeks exploring the Amazon headwaters near Jaen, Peru, then crossed the Andes again near Cajamarca, where he spent five days visiting relics linked to the Inca ruler’s capture and execution by the Spanish, including the supposed execution stone and the room where Atahualpa offered gold for his freedom.. At this point, Humboldt’s measurement of Earth’s magnetic intensity provided a benchmark for future geomagnetic studies, as they crossed the magnetic equator. By October 1802, after extensive travel in the Andes, the expedition reached sea level at Trujillo and arrived in Lima on 23 October 1802. Humboldt’s impressions of Lima were largely unfavorable. In a letter dated January 18, 1803, addressed to the Governor of Jaén, he described Lima as having declined significantly compared to other South American cities such as Buenos Aires, Santiago de Chile, and Arequipa. He observed an absence of well-furnished homes and well-dressed women, attributing the city’s poverty to economic conditions and widespread gambling. Public amusements were limited to a theater and an attractive bullring. Humboldt noted that nighttime travel by carriage was hindered by stray dogs and donkey carcasses obstructing the streets. He criticized the prevalence of gambling and family separation, which he believed disrupted social cohesion, and remarked on the lack of large social gatherings.
=== Controversy === Several Hardee's ad campaigns in the 2000s have been criticized by groups including Parents Television Council for their sexually suggestive nature. A campaign titled "More Than a Piece of Meat" featured scantily clad women appearing to receive sexual gratification from consuming Hardee's products, and "Name Our Holes" – an ad campaign and website promoting Hardee's Biscuit Holes. In January 2015, Carl's Jr. released a commercial online featuring model Charlotte McKinney advertising its new All Natural Burger to air regionally during Super Bowl XLIX. The ad features McKinney walking around a farmers' market, implying that she is "all natural" and uses double entendres to suggest that she is naked with strategically placed items in the market until it reveals McKinney in a bikini eating the All Natural Burger. Critics suggested that the ad "sets feminism back four decades," while others, including McKinney's elderly grandfather, enjoyed the ad. Until the YouTube video of the ad was privatized by Carl's Jr. in March 2017, it had over 13 million views and 10 thousand likes.
In the field of cell biology, TNF-related apoptosis-inducing ligand (TRAIL), is a protein functioning as a ligand that induces the process of cell death called apoptosis. TRAIL is a cytokine that is produced and secreted by most normal tissue cells. It causes apoptosis primarily in tumor cells, by binding to certain death receptors. TRAIL and its receptors have been used as the targets of several anti-cancer therapeutics since the mid-1990s, such as Mapatumumab. However, as of 2013, these have not shown significant survival benefit. TRAIL has also been implicated as a pathogenic or protective factor in various pulmonary diseases, particularly pulmonary arterial hypertension. TRAIL has also been designated CD253 (cluster of differentiation 253) and TNFSF10 (tumor necrosis factor (ligand) superfamily, member 10).
== External links == Histology image: 42_04 at the University of Oklahoma Health Sciences Center Histology image: 14302loa – Histology Learning System at Boston University Histology at KUMC endo-/endo10 Anatomy Atlases – Microscopic Anatomy, plate 15.287
{\displaystyle {\begin{aligned}{\text{triglyceride}}+{\ce {H2O}}&\longrightarrow {\text{fatty acid}}+{\text{diacylglycerol}}\\[4pt]{\text{diacylglycerol}}+{\ce {H2O}}&\longrightarrow {\text{fatty acid}}+{\text{monacylglycerol}}\\[4pt]{\text{monacylglycerol}}+{\ce {H2O}}&\longrightarrow {\text{fatty acid}}+{\text{glycerol}}\end{aligned}}}
Sources: en.wikipedia.org
Cardarine is commonly known as GW501516 or GW-1516. These names refer to the same synthetic compound. It is not a brand-name approved medicine.
No, cardarine is not a steroid. It is classified as a PPARδ agonist. Its structure and receptor target differ from anabolic steroids.
No regulatory agency has approved cardarine as a medicine. It was investigated in early research but development was discontinued. It is not available as a prescription drug.
No. Major drug regulators have not approved GW501516 for treating any medical condition. Products sold as cardarine are typically unapproved research chemicals or supplements, so their contents and safety are not assured.