Everything below concerns LC-MS/MS. We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Last reviewed on 2026-06-24. Where a claim depends on a specific study, the study is described rather than over-claimed.
Laboratory detection of cardarine typically involves sample preparation followed by chromatographic separation and mass spectrometric identification. Urine is the most common matrix for anti-doping tests, though blood and hair have also been explored. Methods can target the parent compound or its metabolites, depending on the expected window of detection. Reference standards are required for accurate quantification. Matrix effects and dilution can influence results, so laboratories use internal standards and validation protocols. The exact detection window varies with dose, route, and individual metabolism.
A common misconception is that cardarine has been proven safe for human use. In reality, human clinical data are limited, and long-term animal studies have raised concerns about cancer. Another misconception is that it is a supplement or vitamin-like compound. It is a synthetic research chemical with no approved medical indication. Scientific discussion often focuses on its mechanism and detection rather than therapeutic use. Regulatory and anti-doping literature treats it primarily as a prohibited substance.
Cardarine is explicitly prohibited by the World Anti-Doping Agency under the class of PPARδ agonists. Its presence in urine or blood samples can be detected using mass spectrometry-based methods, often liquid chromatography-tandem mass spectrometry. Athletes who test positive may face sanctions, including bans from competition. The compound is also regulated as a prescription-only or unapproved drug in many countries. Enforcement varies by jurisdiction, and some regions treat it as a controlled substance. Online sales may occur despite these restrictions, creating quality and legal risks.
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.
Early clinical research explored GW501516 for lipid disorders, obesity, and diabetes. Some short-term human studies reported changes in HDL cholesterol, LDL cholesterol, and triglycerides. The development program was discontinued after rodent studies showed dose-dependent tumor formation in multiple tissues, including liver, bladder, stomach, and skin. These findings raised concerns about long-term cancer risk in humans. Because human exposure data are limited, the clinical significance of the rodent tumors remains uncertain.
| Property | Value | Notes |
|---|---|---|
| Regulatory status | Prohibited in sport | Listed by WADA as a PPARδ agonist. |
| Typical detection matrix | Urine | Most common sample for anti-doping analysis. |
| Common analytical method | LC-MS/MS | Liquid chromatography-tandem mass spectrometry. |
| Common synonyms | GW501516, GSK-516, endurobol | Names found in research and fitness contexts. |
| Typical detection window | Variable | Depends on dose, route, and individual metabolism. |
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.
Cardarine is a common name for GW501516, a synthetic compound studied for its effects on lipid and glucose metabolism. It functions as an agonist at peroxisome proliferator-activated receptor delta, or PPARδ, a nuclear receptor that influences gene expression. The molecule is not a steroid, nor is it a selective androgen receptor modulator. It is also known in research and sports literature as GW-501516 and endurobol. Early laboratory work examined its metabolic activity in cell cultures and animal models.
Laboratory studies have examined GW501516 in cell cultures and rodents for conditions such as dyslipidemia, insulin resistance, and obesity. Some trials in humans were initiated, but development was discontinued after preclinical findings raised concerns about cancer in certain models. Those findings do not prove that the compound causes cancer in people, but they contributed to regulatory caution. Later reviews often describe the evidence as preliminary and insufficient for assessing long-term safety.
In the fitness and bodybuilding literature, cardarine is frequently discussed as an endurance agent or fat-loss compound, although such claims are not supported by robust clinical evidence. Online descriptions often mix animal data, user anecdotes, and marketing language. Researchers who study PPARδ agonists distinguish between receptor activation in controlled experiments and unsupervised use of unverified products. The latter introduces unknown purity, dose, and interactions, making reported experiences difficult to interpret scientifically.
GW501516 acts as an agonist at peroxisome proliferator-activated receptor delta, a nuclear receptor involved in transcription of genes related to lipid handling and energy use. Activation of PPARδ can shift skeletal muscle toward greater fatty acid oxidation in animal models, which is one reason it drew interest for metabolic disease and exercise research. The exact downstream effects depend on tissue, species, dose, and duration. Human data are sparse, so many proposed benefits remain hypotheses rather than established clinical outcomes.
Cardarine is the common name for GW501516, a synthetic compound studied as a peroxisome proliferator-activated receptor delta agonist. Researchers developed it to explore treatments for lipid disorders and metabolic conditions. It is not an approved medicine in any country. Early clinical work examined changes in HDL cholesterol and triglycerides, but development was discontinued after animal studies raised concerns about cancer. The compound remains available as a research chemical and appears in discussions of performance enhancement.
At the molecular level, GW501516 binds and activates PPARδ, a nuclear receptor that regulates transcription. Activation shifts expression of genes involved in fatty acid oxidation, energy expenditure, and lipid transport in skeletal muscle and liver. Animal studies report increased endurance and altered lipid profiles after exposure. Human data are limited to small trials and do not establish long-term safety or efficacy. PPARδ also has roles in cell proliferation, so the relationship between activation and cancer risk remains an open question.
=== Maintenance and surveillance === Ideally, wound dressings should be changed daily to promote a clean environment and allow for daily evaluation of wound progression. Highly exudative wounds and infected wounds should be monitored closely and may require more frequent dressing changes. Negative pressure wound dressings can be changed less frequently, every 2–3 days. Wound progression over time can be monitored with transparent sheet tracings or photographs, each of which produce reliable measurements of wound surface area.
Whether or not these largely theoretical relationships are causal in humans at realistic exposure levels remains to be seen. Third-hand smoke has also been tested in various cell assays. THS exposure by cells has been shown to lead to the observation of DNA strand breaks, inhibition of proliferation, and cell death. Acrolein has shown to be a particularly potent third-hand smoke gas. A study led by Ashley Merianos, a tobacco researcher at the University of Cincinnati, revealed that in homes where children live, surfaces were contaminated with nicotine and the tobacco-specific carcinogen NNK. This was observed even in homes with voluntary indoor smoking bans, highlighting the persistent nature of THS pollutants. The study revealed higher levels of NNK and nicotine in lower-income households and homes that do not ban indoor smoking. Residential field studies have found that third-hand smoke accumulates in smokers' homes and remains even after the smokers move out, including after long periods of vacancy and standard cleaning. Nonsmoking adults and children who move into such homes have been observed to have higher nicotine levels on their hands and higher urinary cotinine than residents of homes with no history of smoking, indicating continued exposure to THS from contaminated dust, air and surfaces.
However, conflict continued in the southern and central parts of the country. Within months, the TFG had gone from holding about 70% of south-central Somalia's conflict zones, to losing control of over 80% of the disputed territory to the Islamist insurgents.
In some parts of Europe and India, Datura has been a popular poison for suicide and murder. From 1950 to 1965, the State Chemical Laboratories in Agra, India, investigated 2,778 deaths caused by ingesting Datura. A group called Thugs (practicers of thuggee) were reportedly devotees of an Indian religious cult made up of robbers and assassins who strangled or poisoned their victims in rituals devoted to the Hindu goddess Kali. They were alleged to employ Datura in many such poisonings, using it also to induce drowsiness or stupefaction, making strangulation easier. Datura toxins may be ingested accidentally by consumption of honey produced by several wasp species, including Brachygastra lecheguana, during the Datura blooming season. These semi-domesticated honey wasps apparently collect Datura nectar for honey production, which can lead to poisoning. The U.S. Centers for Disease Control and Prevention reported accidental poisoning resulting in hospitalization for a family of six who inadvertently ingested Datura used as an ingredient in stew. In some places around the world, such as India due to the Drug & Cosmetic Act 1940 & Rule 1995, buying, selling, or cultivating Datura plants is prohibited. Solanaceous tribes with a similar chemistry (i.e.
Very low bodyweight; Rapid weight loss, regardless of starting bodyweight; Medical comorbidities, such as infection or malabsorption; Excessive purging behaviours, including self-induced vomiting, laxative abuse, and diuretic abuse. Two of the most common indicators that RFS is occurring are low phosphate levels and low potassium levels. In these circumstances, it is recommended to start refeeding more slowly but to build up rapidly as long as RFS does not occur. Recommendations on energy requirements in the most medically compromised patients vary, from 5–10 kcal/kg/day to 1900 kcal/day. Treatment professionals must balance the risk of RFS with the risk of underfeeding, which can result in poor health outcomes for short- and long-term recovery.
Sources: en.wikipedia.org
The Energy Performance of Buildings Directive 2010 aims to eliminate unclean materials and energy waste to have "nearly zero-energy buildings", particularly by setting standards for new buildings since 2020 and upgrading existing buildings by 2050. There is, however, no requirement yet that all buildings replace gas heating with electric or heat-pumps, have solar or wind energy generation, electric vehicle charging, and particular insulation standards, wherever possible.
== Biological functions == (Z)-9-Tricosene is a sex pheromone produced by female house flies (Musca domestica) to attract males. In bees, it is one of the communication pheromones released during the waggle dance.
The two substrates of this enzyme are 14-demethyllanosterol and oxidised nicotinamide adenine dinucleotide phosphate (NADP+). Its products are 4,4-dimethyl-5α-cholesta-8,14,24-trien-3β-ol, reduced NADPH, and a proton. This enzyme belongs to the family of oxidoreductases, specifically those acting on the CH-CH group of donor with NAD+ or NADP+ as acceptor. The systematic name of this enzyme class is 4,4-dimethyl-5alpha-cholesta-8,24-dien-3beta-ol:NADP+ Delta14-oxidoreductase. This enzyme participates in biosynthesis of steroids.
While juxtaposed against free-radical polymerization, the application of automated synthesis can be utilized for controlled radical polymerization too. These methods have been used within reversible addition-fragmentation transfer (RAFT), atom-transfer radical (ATRP), and nitroxide-mediated polymerizations, demonstrating the ability of robots to improve efficiency and reduce the hardship of performing reactions. For example, with the automatic dispensation of reagents, Symyx Technologies Inc. was able to polymerize styrene and butyl acrylate through ATRP. In addition, this functionality was supported by Zhang et al. within their research, finding that reproducibility and comparability were equivalent to classical ATRP.
Suess said he drew the line showing the wiggles by "cosmic schwung", by which he meant that the variations were caused by extraterrestrial forces. It was unclear for some time whether the wiggles were real or not, but they are now well-established. These short term fluctuations in the calibration curve are now known as de Vries effects, after Hessel de Vries. A calibration curve is used by taking the radiocarbon date reported by a laboratory and reading across from that date on the vertical axis of the graph. The point where this horizontal line intersects the curve will give the calendar age of the sample on the horizontal axis. This is the reverse of the way the curve is constructed: a point on the graph is derived from a sample of known age, such as a tree ring; when it is tested, the resulting radiocarbon age gives a data point for the graph.
Sources: en.wikipedia.org
An insulin analogue (also called an insulin analog) is a type of medical insulin that has been modified to alter its pharmacokinetic properties while maintaining the same biological function as human insulin. These modifications are achieved through genetic engineering, which allows for changes in the amino acid sequence of insulin to optimize its absorption, distribution, metabolism, and excretion (ADME) characteristics. All insulin analogues work by enhancing glucose uptake in tissues and reducing glucose production by the liver. They are prescribed for conditions such as type 1 diabetes, type 2 diabetes, gestational diabetes, and diabetes-related complications such as diabetic ketoacidosis. Additionally, insulin is sometimes administered alongside glucose to treat elevated blood potassium levels (hyperkalemia). Insulin analogues are classified based on their duration of action. Short-acting (bolus) insulin analogues, such as insulin lispro, insulin aspart, and insulin glulisine, have been designed to be absorbed quickly, mimicking the natural insulin response after meals. Long-acting (basal) insulin analogues, including insulin glargine, insulin detemir, and insulin degludec, provide a sustained release of insulin to maintain basal blood glucose levels over an extended period. These modifications enhance the predictability of insulin therapy and reduce the risk of hypoglycemia compared to regular human insulin. Lispro, the first insulin analogue, was approved in 1996. This was followed by an influx of new analogues with differing pharmacokinetic properties.
=== 13-31 August 2008 === An anonymous U.S. functionary said: "Saakashvili had always told us he could not stand by while Georgian villages were being shelled, and we always knew this was a point of pressure. We always told him that he should not give in to the kind of provocations we knew the Russians were capable of." In August 2008, Modest Kolerov, former head of the Department for international and cultural ties with foreign countries of the President's Office, admitted that the Kremlin had "a clear plan of action in the case of a conflict", and "the expediency with which the military operation was executed confirms that." Robert Gates, United States Secretary of Defense, said on August 14 that there had been clashes with the South Ossetian forces each August since 2004, but "This year it escalated very quickly and it seemed to me that Russians were prepared to take advantage of an opportunity and did so very aggressively." Zbigniew Brzezinski compared Russia's attack on Georgia to the Soviet attack on Finland and wrote that "Moscow was waiting for such an act to provide a pretext for the use of force." He suggested that Russia could attack Ukraine and other post-Soviet countries were not safe. Ralph Peters, a former military intelligence analyst, and several western diplomats (a western diplomat with contacts with the Georgians and a western mediator acquainted with Saakashvili) said that it was Russia who was provoking Georgia. It was reported that the United States had prevented Saakashvili from taking military action in Abkhazia in early May 2008.
The results of studies which have looked at healing of electrosurgical wounds compared to scalpel wounds vary widely but it has been found that electrosurgerical equipment minimises bleeding and most patients experience very little post-operative pain after the procedure. There may be more damage to adjacent tissues, slower wound healing and more inflammatory response than the scalpel technique.
The Spartanburg Pellagra Hospital in Spartanburg, South Carolina, was the first facility in the United States dedicated to discovering the cause of pellagra. It was established in 1914 with a special Congressional appropriation to the U.S. Public Health Service and set up primarily for research. In 1915, Dr. Joseph Goldberger, assigned to study pellagra by the surgeon general of the United States, showed it was linked to diet by observing the outbreaks of pellagra in orphanages and mental hospitals. Goldberger noted that children between the ages of 6 and 12 (but not older or younger children at the orphanages) and patients at the mental hospitals (but not doctors or nurses) were the ones who seemed most susceptible to pellagra. Goldberger theorized that a lack of meat, milk, eggs, and legumes made those particular populations susceptible to pellagra. By modifying the diet served in these institutions with "a marked increase in the fresh animal and the leguminous protein foods," Goldberger was able to show that pellagra could be prevented. By 1926, Goldberger established that a diet that included these foods, or a small amount of brewer's yeast, prevented pellagra. Goldberger experimented on 11 prisoners (one was dismissed because of prostatitis). Before the experiment, the prisoners were eating the prison fare fed to all inmates at Rankin Prison Farm in Mississippi. Goldberger started feeding them a restricted diet of grits, syrup, mush, biscuits, cabbage, sweet potatoes, rice, collards, and coffee with sugar (no milk).
Sources: en.wikipedia.org
Yes, WADA prohibits cardarine as a PPARδ agonist. It appears on the prohibited list and can be detected in urine or blood. Athletes using it risk sanctions.
Detection usually uses liquid chromatography-tandem mass spectrometry after sample cleanup. Laboratories look for the parent compound or metabolites. The method requires validated reference standards and controls.
Legality varies by country. In many places it is an unapproved drug and cannot be legally sold for human consumption. Purchasing from online vendors carries legal and quality risks.
It targets PPARδ, a nuclear receptor involved in lipid and energy metabolism. It does not act primarily on androgen receptors. This distinction separates it from SARMs.