This is a working overview of Preclinical research, written for readers who want more than a one-paragraph summary but less than a textbook.
Reviewed 2026-02-26. Anything still debated is marked as such rather than presented as settled.
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.
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.
| 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. |
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.
Activation of PPARδ changes transcription of genes involved in fatty acid transport, mitochondrial function, and skeletal muscle fuel preference. In rodent studies, pharmacological PPARδ activation was associated with increased endurance and altered body composition. These findings generated interest in performance enhancement, but species differences and study designs limit direct extrapolation to humans. Small human trials were conducted in the 2000s and later discontinued. The extent to which cardarine produces similar metabolic or performance effects in people remains an open question.
The compound is typically described as a laboratory compound rather than a therapeutic product. Published reports have explored its role in lipid disorders, insulin sensitivity, and exercise metabolism, yet no major drug regulator has approved it for medical use. Commercial samples sold under the cardarine name may vary in purity and identity. Analytical confirmation is therefore necessary when the material is discussed in scientific or regulatory contexts. Its classification as a prohibited substance in sport further shapes how it is studied and reported.
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.
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.
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.
Butyl lithium (n-C4H9Li) Lithium diisopropylamide (LDA) [(CH3)2CH]2NLi Lithium diethylamide (LDEA) (C2H5)2NLi Sodium amide (NaNH2) Sodium hydride (NaH) Lithium bis(trimethylsilyl)amide [(CH3)3Si]2NLi The strongest superbases are synthesised in only gas phase:
Criticism arose that a person with farming links should have been chosen, for the bikini-clad girls on the cover of Town magazine, which were considered risqué at the time, and for jokes in the magazine at the expense of the Royal Family. He was selected after a stirring speech to around 540 assembled members of the local Conservative Association on Friday 26 March 1965. Crick believes that this is a rare example in politics of a single speech determining a career. Only 27 members supported an amendment to refer the matter back to the selection committee and 14 opposed Heseltine's adoption altogether. Thereafter his name stopped appearing as "publisher" on his magazines. He had to learn about farming, an important issue in the seat, about which he knew almost nothing.
Hyperphosphorylation is believed to contribute to the development and progression of FTLD-tau, but evidence is inconclusive regarding the extent of its influence. There are significant differences in phosphorylation states across FTLD tauopathies, and the reasons for these differences are currently unknown. Pick bodies, for example, are not phosphorylated. Tau aggregation in FTLD-tau occurs not only through accumulation and altered phosphorylation but also through a disrupted balance between 3R and 4R isoforms.
Mass media, lawmakers, and Donald Trump raised concerns about Biden's age, including his cognitive state, during and after the 2020 United States presidential election. According to a February 2024 poll, Biden's age and health were major or moderate concerns for 86% of voters generally, up from 76% in 2020. According to another February 2024 poll, most of those who voted for Biden in 2020 believed he was too old to be an effective president; The New York Times noted that these concerns "cut across generations, gender, race and education". Concerns about Biden's age and health increased after a poor performance by Biden during a debate against Trump in June 2024. That performance led a number of commentators and Democratic lawmakers to call for Biden to drop out of the 2024 presidential race. In July 2024, Biden ultimately withdrew from the race while stating that he would continue serving as president until the conclusion of his term.
Sources: en.wikipedia.org
Placing flat hands on the floor with straight legs Left knee bending backward Right knee bending backward Left elbow bending backward Right elbow bending backward Left thumb touching the forearm Right thumb touching the forearm Left little finger bending backward past 90 degrees Right little finger bending backward past 90 degrees
Instead, the ionic current from an action potential at one node of Ranvier provokes another action potential at the next node; this apparent "hopping" of the action potential from node to node is known as saltatory conduction. Although the mechanism of saltatory conduction was suggested in 1925 by Ralph Lillie, the first experimental evidence for saltatory conduction came from Ichiji Tasaki and Taiji Takeuchi and from Andrew Huxley and Robert Stämpfli. By contrast, in unmyelinated axons, the action potential provokes another in the membrane immediately adjacent, and moves continuously down the axon like a wave.
=== Academics and Islamic scholars === Muhammad Ibn Muhammad Al-Fulani Al-Kishwani – prominent mathematician in the early 1700s from Katsina Usman dan Fodio (1754–1817) – Islamic scholar, revolutionary from Sokoto, founder and spiritual leader of the Sokoto Caliphate. Abdullahi dan Fodio (1766–1829) – scholar, jurist, pioneer, Grand Vizier of Sokoto and first Emir of Gwandu (r. 1812–1828). Nana Asma'u – princess, poet, Islamic scholar and daughter of Usman dan Fodio. Muhammed Bello (1781–1837) – the first sultan of Sokoto. Abd al-Qadir dan Tafa (1804–1864) – described as the "most learned scholar of his time" in the Sokoto Caliphate who specialized in philosophy (Falsafa) Abu Bakr Atiku (1782–1842) – second sultan of the Sokoto Caliphate, reigning from October 1837 until November 1842. Muhammadu Junaidu – former grand vizier of Sokoto, historian, writer Hayatu ibn Sa'id - great-grandson of Usman dan Fodio, Mahdist leader who attempted to conquer Bornu and The Sokoto Caliphate. Muhammad Bukhari bin Uthman - military commander, scholar and poet. Son Of Usman dan Fodio. Modibbo Adama (1786–1847) – first Laamiɗo and founder of Fombina (Adamawa emirate) which covered parts of Nigeria, Cameroon and Chad. Modibbo Raji – influential 19th century Islamic scholar who is generally regarded as the founder of the Islamic scholarly tradition in Adamawa;Wazir(vizier) in the Gwandu Emirate of the Sokoto Caliphate Muhammad Auwal Albani Zaria - prominent Islamic scholar and reformer. Isa Ali Pantami - Islamic scholar, former Minister of Communications and Digital economy.
== Factors influencing bioavailability == The absolute bioavailability of a drug, when administered by an extravascular route, is usually less than one (i.e., F< 100%). Various physiological factors reduce the availability of drugs prior to their entry into the systemic circulation. Whether a drug is taken with or without food will also affect absorption, other drugs taken concurrently may alter absorption and first-pass metabolism, intestinal motility alters the dissolution of the drug and may affect the degree of chemical degradation of the drug by intestinal microflora. Disease states affecting liver metabolism or gastrointestinal function will also have an effect. Other factors may include, but are not limited to:
===== Findings ===== In February 2021, after conducting part of their study, the WHO stated that the likely origin of COVID-19 was a zoonotic event from a virus circulating in bats, likely through another animal carrier, and that the time of transmission to humans was likely towards the end of 2019. The Chinese and the international experts who jointly carried out the WHO-convened study consider it "extremely unlikely" that COVID-19 leaked from a lab. No evidence of a lab leak from the Wuhan Institute of Virology was found by the WHO team, with team leader Peter Ben Embarek stating that it was "very unlikely" due to the safety protocols in place. During a 60 Minutes interview with Lesley Stahl, Peter Daszak, another member of the WHO team, described the investigation process to be a series of questions and answers between the WHO team and the Wuhan lab staff. Stahl made the comment that the team was "just taking their word for it", to which Daszak replied, "Well, what else can we do? There's a limit to what you can do and we went right up to that limit. We asked them tough questions. They weren't vetted in advance. And the answers they gave, we found to be believable—correct and convincing." The investigation also stated that transfer from animals to humans was unlikely to have occurred at the Huanan Seafood Market, since infections without a known epidemiological link were confirmed before the outbreak around the market.
Sources: en.wikipedia.org
=== Norway === The Norwegian Armed Forces use a 24-hour ration pack (Norwegian: feltrasjon) designed by Drytech, consisting of 2 freeze-dried main meals, a packet of compressed breakfast cereal, packets of instant soup, and supplements. These are packed in 3 green polylaminate bags labelled "Breakfast", "Lunch", or "Dinner", overwrapped in clear plastic and issued as one day's ration. Depending on the soldiers activity, the rations are delivered in two different sizes of either 3800 kcal or 5000 kcal. Included are a substantial assortment of beverages (cocoa mix, instant coffee, energy drink powder, and herbal teas), plus thin sliced rye bread and chocolate, chewing gum, a vitamin tablet, and litter bags. There are 7 completely different menus, and ongoing development to meet different nations requirements. The main meals are for example Chili con carne, different pasta dishes, Beef Stew, Beef and Potato Casserole, Lamb Mulligatawny, Cod and Potato Casserole, Pasta Bolognese, Wolf-fish with Prawns and Dill, Sweet and Sour Chicken, Rice in Basil Sauce etc. Small tins of fish are often provided separately.
Hedonism about well-being, also called prudential hedonism, holds that pleasure and pain are the only factors of well-being. It states that how well a person's life goes depends entirely on how it feels to live it, expressed as the balance of pleasure over pain. According to this view, a person who experiences frequent joy and contentment has high well-being, whereas someone who is constantly in pain and suffering has low well-being. One view sees pleasure and pain as bodily sensations, like the pleasure of eating delicious food and the pain of injuring a leg. However, hedonists generally take a wider perspective, characterizing pleasure and pain broadly as any experience that feels good or bad. This broader understanding includes the intellectual pleasure of reading an engaging book and the sorrow of losing a loved one. According to quantitative hedonism, the value of each episode of pleasure and pain depends only on its intensity and duration. Qualitative hedonism, an alternative perspective, additionally considers non-quantitative factors, arguing that some pleasures are intrinsically superior to others because of their qualitative character, even if they have the same intensity and duration. One criticism of hedonism acknowledges that some pleasures have value but rejects that this is the case for all of them. According to this view, certain pleasures have no value and may even be bad for a person, such as sadistic pleasures from torturing animals.
Type I present in liver, kidney, thyroid, and (to a lesser extent) pituitary; it accounts for 80% of the deiodination of T4. Type II present in CNS, pituitary, brown adipose tissue, and heart vessel, which is predominantly intracellular. In the pituitary, it mediates negative feedback on thyroid-stimulating hormone. Type III present in placenta, CNS, and hemangioma. This deiodinase converts T4 into reverse T3, which, unlike T3, is inactive. T4 is synthesised in the thyroid follicular cell as follows.
Tadalafil, sold under the brand name Cialis among others, is a medication used to treat erectile dysfunction, benign prostatic hyperplasia, and pulmonary arterial hypertension. It is taken by mouth. Onset is typically within half an hour and the duration is up to 36 hours. Common side effects include headache, muscle pain, flushing, and nausea. Caution is advised in those with cardiovascular disease. Rare but serious side effects include a prolonged erection that can lead to damage to the penis, vision problems, and hearing loss. Tadalafil is not recommended in people taking nitrovasodilators such as nitroglycerin, as this may result in a serious drop in blood pressure. Tadalafil is a PDE5 inhibitor which increases blood flow to the penis. It also dilates blood vessels in the lungs, which lowers the pulmonary artery pressure. Tadalafil was approved for medical use in the United States in 2003. It is available as a generic medication. In 2022, it was the 172nd most commonly prescribed medication in the United States, with more than 3 million prescriptions.
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.
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.