A practical reference on LC-MS/MS: what it is, how it behaves, what the literature reports, and where the honest uncertainties sit.
This page was last updated on 2026-04-08 and is reviewed periodically as new material appears.
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.
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 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.
| Property | Value | Notes |
|---|---|---|
| Common synonyms | GW501516; GW-1516; endurobol | GW501516 is the research code |
| Drug class | PPARδ agonist | Not a selective androgen receptor modulator |
| Molecular formula | C21H18F3NO3S2 | Established chemical formula |
| Molar mass | 453.5 g/mol | Calculated from the formula |
| Regulatory status | Prohibited in sport; not approved as medicine | Status varies by country |
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.
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.
Cardarine is a common name for GW501516, a synthetic compound first described in the 1990s as a selective agonist of the peroxisome proliferator-activated receptor delta. It was studied in preclinical models for metabolic and cardiovascular conditions, but it has not been approved as a medicine in the United States, Europe, or other major jurisdictions. Retail products labeled as cardarine are generally research chemicals or supplements, not pharmaceutical formulations. Because human safety and efficacy data remain limited, regulatory agencies treat it as an unapproved substance rather than a therapeutic product.
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.
== German Empire (1871–1918) == The German Empire was born out of the North German Confederation as result of the Franco-Prussian War (1870/71). The Präsidium (the Prussian king), which now had also the title Emperor, named the chancellor. Political parties: None Centre
==== Alternative theories ==== The 5,000-year-old mummified body of Ötzi the Iceman was found with 15 groups of tattoos, many of which were located at points on the body where acupuncture needles are used for abdominal or lower back problems. Evidence from the body suggests Ötzi had these conditions. This has been cited as evidence that practices similar to acupuncture may have been practised elsewhere in Eurasia during the early Bronze Age; however, The Oxford Handbook of the History of Medicine calls this theory "speculative". It is considered unlikely that acupuncture was practised before 2000 BC. Acupuncture may have been practised during the Neolithic era, near the end of the Stone Age, using sharpened stones called Bian shi. Many Chinese texts from later eras refer to sharp stones called "plen", which means "stone probe", that may have been used for acupuncture purposes. The ancient Chinese medical text, Huangdi Neijing, indicates that sharp stones were believed at-the-time to cure illnesses at or near the body's surface, perhaps because of the short depth a stone could penetrate. However, it is more likely that stones were used for other medical purposes, such as puncturing a growth to drain its pus. The Mawangdui texts, which are believed to be from the 2nd century BC, mention the use of pointed stones to open abscesses, and moxibustion, but not for acupuncture. It is also speculated that these stones may have been used for bloodletting, due to the ancient Chinese belief that illnesses were caused by demons within the body that could be killed or released.
Optimal health ranges (or "target ranges") are between 120 and 360 μmol/L or equivalently 2 to 6 mg/dL. This is optimally achieved during at least the first 10 years, to allow the brain to develop normally. The diet requires restricting or eliminating foods high in phenylalanine (Phe), particularly high-protein foods such as meat, fish, eggs, dairy products, legumes, nuts, and soy-based products. Specialized low-phenylalanine medical foods are typically used to meet nutritional requirements. Starchy foods, such as potatoes and corn are generally acceptable in controlled amounts, but the quantity of Phe consumed from these foods must be monitored. A corn-free diet may be prescribed in some cases. A food diary is usually kept to record the amount of Phe consumed with each meal, snack, or drink. An "exchange" system can be used to calculate the amount of Phe in a portion of food from the protein content identified on a nutritional information label. Lower-protein "medical food" substitutes are often used in place of regular bread, pasta, and other grain-based foods, which contain a significant amount of Phe. Many fruits and vegetables are lower in Phe and can be eaten in larger quantities. Infants may still be breastfed to receive all of the benefits of breastmilk, but the quantity must also be monitored, and supplementation with missing nutrients will be required. The sweetener aspartame, present in many diet foods and soft drinks, must also be avoided, as aspartame contains phenylalanine.
The mechanical refrigerator (first patented in the 1850s in Europe) liberated brewers and winemakers from seasonal constraints for the first time and allowed them to exit cellars and other earthen environments. For John Molson, who made his livelihood in Montreal prior to the development of the refrigerator, the brewing season lasted from September through to May. The same seasonal restrictions formerly governed the distiller's art.
== Metabolism and survival == The metabolism of endolithic microorganisms is versatile; genes involved in sulphur metabolism, iron metabolism and carbon fixation have been found in many endolithic communities. Whether they metabolize directly from the surrounding rock, or excrete an acid to dissolve it first is yet undetermined. According to Meslier & DiRuggiero there are genes found in the endolithic community involved in nitrogen fixation. The Ocean Drilling Program found microscopic trails in basalt from the Atlantic, Indian, and Pacific oceans that contain DNA. Photosynthetic endoliths have also been discovered. As water and nutrients are sparse in the endolith's surrounding environment, water limitation is a key factor in the capacity of survival of many endolithic microorganisms. Many of those microorganisms have adaptations to survive in low concentrations of water. Additionally, pigments such as beta carotenes and chlorophyll, especially in cyanobacteria and some algae, help to protect against dangerous radiation and act as a way to obtain energy. Another characteristic is the presence of a very slow reproduction cycle. Early data suggest some only engage in cell division once every hundred years. In August 2013, researchers reported evidence of endoliths in the ocean floor, perhaps millions of years old and reproducing only once every 10,000 years. Most of their energy is spent repairing cell damage caused by cosmic rays or racemization, and very little is available for reproduction or growth.
Sources: en.wikipedia.org
derivatization The artificial modification of a molecule or protein with the intent of altering its solubility or other chemical properties so as to enable analysis (e.g. by mass spectroscopy or chromatography), or of labelling it by attaching a detectable chemical moiety (e.g. a fluorescent tag) to make it easier to identify and track in vivo. Molecules modified in this way are described as derivatives of their naturally occurring counterparts and are said to have been derivatized.
=== Shortness of breath === Morphine is beneficial in reducing the symptom of shortness of breath due to both cancer and non-cancer causes. In the setting of breathlessness at rest or on minimal exertion from conditions such as advanced cancer or end-stage cardiorespiratory diseases, regular, low-dose sustained-release morphine significantly reduces breathlessness safely, with its benefits maintained over time.
Hyberbaric Oxygen Therapy Wound Debridement, a minor surgical procedure enhances the growth of healthy tissues in the wound Transcutaneous Oxygen Monitoring, a test that records the level of oxygen available to your wound Doppler Evaluation of Pulses, a technique that measures the blood flow available to bring nutrients and medications to the wound
His reply to the votes of censure passed by the Assembly, and their refusal to increase his civil list was to hint at a vast communistic plot in order to scare the bourgeoisie, and to denounce the electoral law of 31 May 1850, in order to gain the support of the mass of the people. The Assembly retaliated by throwing out the proposal for a partial reform of that article of the constitution which prohibited the re-election of the president and the re-establishment of universal suffrage (July). All hope of a peaceful issue was at an end. When the questors called upon the Chamber to have posted in all barracks the decree of 6 May 1848 concerning the right of the Assembly to demand the support of the troops if attacked, the Mountain, dreading a restoration of the monarchy, voted with the Bonapartists against the measure, thus disarming the legislative power. Louis-Napoléon saw his opportunity, and organised the French coup of 1851. On the night of 1/2 December 1851, the anniversary of his uncle Napoleon's coronation in 1804 and his victory at Austerlitz in 1805, he dissolved the Chamber, re-established universal suffrage, had all the party leaders arrested, and summoned a new assembly to prolong his term of office for ten years. The deputies who had met under Berryer at the Mairie of the 10th arrondissement to defend the constitution and proclaim the deposition of Louis Napoleon were scattered by the troops at Mazas and Mont Valérien. The resistance organized by the republicans within Paris under Victor Hugo was soon subdued by the intoxicated soldiers.
5 August – The 18th century Crooked House, once known as "Britain's wonkiest pub", is gutted by a fire. The pub is demolished two days later. Police subsequently confirm they are treating the fire as arson. 6 August Secretary of State for Justice Alex Chalk confirms that the rule deducting living costs from compensation paid to people who have been wrongfully convicted will be scrapped. Greetings card retailer Clintons are to close around 20% of their outlets to cut back on expenditure. 7 August – The first group of asylum seekers to be housed on the Bibby Stockholm while they wait for the cases to be processed arrive on the barge following delays over safety concerns. 8 August The Police Service of Northern Ireland issues an apology after a data breach led to the details of its officers being published online. The Electoral Commission warns people to look out for unauthorised use of their data after revealing it was the victim of a "complex cyber-attack" in August 2021, which was not discovered until October 2022. The Joint Committee on Vaccination and Immunisation recommends the Autumn 2023 programme of COVID-19 booster vaccines should be routinely offered to all over-65s, as well as those under 65 in clinical risk groups, care home residents and frontline health workers. This marks a change from 2022 when all adults over 50 were offered the booster. The flu vaccine will also be offered to over 65s after the age was dropped to 50 during the pandemic.
Sources: en.wikipedia.org
No. Cardarine is GW501516, a PPARδ agonist, while SARMs act on androgen receptors. The two classes are often grouped in informal discussions despite different mechanisms.
No. It has no approved medical indication in any country. Regulatory agencies have not cleared it for treatment or prevention of any condition.
Early clinical work stopped after rodent carcinogenicity findings. Those animal results raised concerns about long-term human risk, although direct human evidence is lacking. The human relevance of the tumors remains an open scientific question.
Legal status varies by country. It is not approved as a medicine, and it is prohibited in sport. Some jurisdictions restrict import, sale, or possession.