If you have been reading about Prohibited substance and want a single page that covers the useful parts, this is it: definitions, context, how it is studied, and the questions that come up repeatedly.
Last reviewed on 2026-05-11. Where a claim depends on a specific study, the study is described rather than over-claimed.
A persistent misconception is that cardarine is a fat-burning drug or a safe alternative to anabolic steroids. No approved therapeutic product exists, and human safety data are limited. The tumor findings in rodents remain a central concern in scientific reviews. Products sold online may contain inaccurate labels, impurities, or different compounds entirely, which complicates any assessment of effects. Independent testing of such products has reported frequent mislabeling. For these reasons, discussions in the literature emphasize risks and unknowns rather than benefits.
Cardarine is not approved for human therapeutic use in any major jurisdiction. It appears on the World Anti-Doping Agency Prohibited List as a PPARδ agonist within the hormone and metabolic modulators category. Sports organizations test for it because it has been detected in athlete samples and seized products. Regulatory actions against marketed research chemical versions have occurred in several countries, though enforcement varies. Availability through unregulated channels complicates oversight.
Analytical laboratories typically identify cardarine and its metabolites using liquid chromatography-tandem mass spectrometry. Urine is a common matrix in anti-doping testing, while blood and tissue may be used in research settings. Detection windows depend on the assay, the sample matrix, and the compound's metabolism. Because cardarine is extensively metabolized, laboratories often target specific metabolites to improve sensitivity and confirmation. Reference standards are required for reliable quantification. Method validation includes checks for selectivity, linearity, and carryover.
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.
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.
| Property | Value | Notes |
|---|---|---|
| Regulatory status | Not approved for human therapeutic use | No marketing authorization identified in major jurisdictions. |
| Anti-doping class | PPARδ agonist; hormone and metabolic modulators | Listed on the WADA Prohibited List. |
| Common test matrix | Urine | Also blood and tissue in research settings. |
| Typical analytical method | LC-MS/MS | Targets parent compound and metabolites. |
| Major safety signal | Tumor findings in rodents | Human relevance not established; limited human data. |
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.
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.
GW501516 acts on PPARδ, a nuclear receptor that helps regulate fatty acid oxidation and energy homeostasis. In animal studies, activation of this receptor was associated with increased endurance and changes in lipid metabolism. Human trials examined effects on blood lipids and other metabolic markers, but the compound did not advance to approval. Rodent studies later reported tumors in multiple tissues at doses used in those experiments. Whether those findings translate to human risk remains uncertain, and the clinical relevance of the animal data is still debated.
Regulatory bodies treat GW501516 as a prohibited substance in competitive sport. The World Anti-Doping Agency added it to the prohibited list, and it falls under classes covering metabolic modulators and hormone-related agents. It is not approved by drug regulators for human use, and it is not a lawful dietary supplement. Products sold under the cardarine name may contain unlisted ingredients or different compounds. Because no approved product exists, quality and identity are not guaranteed by pharmaceutical manufacturing standards.
Cardarine is a common name for the investigational chemical GW501516, also written GW-1516. It was developed as a peroxisome proliferator-activated receptor delta agonist for metabolic conditions such as dyslipidemia. Early research focused on lipid handling and energy use in skeletal muscle and other tissues. The compound was never approved as a medicine. In public discussion, it is often grouped with performance-enhancing substances, although its receptor target differs from that of anabolic steroids or selective androgen receptor modulators. Regulatory and health authorities have issued warnings about its use.
27 December – The Met Office issues a yellow weather warning for rain over Hogmanay, starting on 30 December and lasting over the New Year. Public Health Scotland says health services in Scotland are under "acute pressure" following a surge in flu cases. Caledonian MacBrayne is forced to reduce the number of passengers allowed on the MV Isle of Mull to 45 per journey after failing a safety check. 29 December – Emergency services searching for keen wild swimmer Ian Napier, missing from the Scousburgh Bay area since 27 December, find a body in the sea near Shetland. 30 December – Edinburgh's Hogmanay celebrations are cancelled amid weather warnings for heavy rain, high winds and snow over the New Year. 2025 New Year Honours: Among those to be recognised in the New Year Honours are broadcaster Jackie Bird (MBE), footballer and broadcaster Alan Hansen (MBE) and Olympic swimmer Duncan Scott (OBE).
== Biosynthesis == The biosynthesis of colistin requires the use of three amino acids: threonine, leucine, and 2,4-diaminobutyric acid. The linear form of colistin is synthesized before cyclization. Non-ribosomal peptide biosynthesis begins with a loading module and then the addition of each subsequent amino acid. The subsequent amino acids are added with the help of an adenylation domain (A), a peptidyl carrier protein domain (PCP), an epimerization domain (E), and a condensation domain (C). Cyclization is accomplished by a thioesterase. The first step is to have a loading domain, 6-methylheptanoic acid, associate with the A and PCP domains. Now with a C, A, and PCP domain that is associated with 2,4-diaminobutyric acid. This continues with each amino acid until the linear peptide chain is completed. The last module will have a thioesterase to complete the cyclization and form the product colistin.
== Products == Its primary products are based on Morpholino oligomers (PMOs), synthetic nucleic acid analogs that were conceived of by James Summerton and invented by Summerton with Dwight Weller, originally developed under the name NeuGene Antisense. Since morpholino oligomers can form sequence-specific double-stranded complexes with RNA they are suitable use in antisense therapy. In one application, translation blocking, a morpholino oligomer binds to messenger RNA produced by a known disease-causing gene to prevent it from being translated into protein. Morpholinos can also work as splice-switching oligos, targeting pre-mRNA to alter splicing and so causing changes in the structure of the mature mRNA (the mechanism of the approved drug eteplirsen). Morpholinos have been tested for a wide range of applications including prevention of cardiac restenosis after angioplasty, treatment of coronary artery bypass grafts, treatment of polycystic kidney disease, redirection of drug metabolism, treatment of some mutations causing Duchenne muscular dystrophy (DMD), and inhibition of infectious diseases. Their greatest clinical and commercial success thus far has been in the treatment of DMD. A new class of Morpholino oligos, the peptide-linked Morpholinos or PPMO, are linked to an arginine-rich cell-penetrating peptide to enhance their delivery into cells and have entered clinical trials.
He added the Lusatias to the Lands of the Bohemian Crown, which then comprised large territories with a significant German population. In the hilly border regions German settlers established major manufactures of forest glass. The situation of the German population was aggravated by the Hussite Wars (1419–1434), though there were also some Germans among the Hussite insurgents. Despite the hardships of the Hussite Wars, the German population remained dominant in the border regions. By then Germans largely settled the hilly Bohemian border regions as well as the cities of the lowlands; mainly people of Bavarian descent in the South Bohemian and South Moravian Region, in Brno, Jihlava, České Budějovice and the West Bohemian Plzeň Region; Franconian people in Žatec; Upper Saxons in adjacent North Bohemia, where the border with the Saxon Electorate was fixed by the 1459 Peace of Eger; Germanic Silesians in the adjacent Sudetes region with the County of Kladsko, in the Moravian–Silesian Region, in Svitavy and Olomouc. The city of Prague had a German-speaking majority from the last third of the 17th century until 1860, but after 1910 the proportion of German speakers had decreased to 6.7% of the population. From the Luxembourgs, rule over Bohemia passed through George of Podiebrad to the Jagiellon dynasty and finally to the House of Habsburg in 1526. Both Czech and German Bohemians suffered heavily in the Thirty Years' War. Bohemia lost 70% of its population.
Sources: en.wikipedia.org
An agent harness, or agent scaffold, is the software layer surrounding a large language model that enables it to function as an AI agent. It commonly manages prompts, context, tool use, memory, execution state, operational constraints, sandboxes, permissions, and the processing of results. The harness connects the model to internal and external computer hardware, software, data files, databases, web browsers, command-line interfaces, and application programming interfaces, while controlling how the agent accesses and uses these resources to complete multi-step tasks.
These non-peptide inhibitors can be more stable than inhibitors containing peptide bonds, because they will not be substrates for peptidases and are less likely to be degraded. In drug design it is important to consider the concentrations of substrates to which the target enzymes are exposed. For example, some protein kinase inhibitors have chemical structures that are similar to ATP, one of the substrates of these enzymes. However, drugs that are simple competitive inhibitors will have to compete with the high concentrations of ATP in the cell. Protein kinases can also be inhibited by competition at the binding sites where the kinases interact with their substrate proteins, and most proteins are present inside cells at concentrations much lower than the concentration of ATP. As a consequence, if two protein kinase inhibitors both bind in the active site with similar affinity, but only one has to compete with ATP, then the competitive inhibitor at the protein-binding site will inhibit the enzyme more effectively.
Inhalation of tobacco smoke causes several immediate responses within the heart and blood vessels. Within one minute, the heart rate begins to rise, increasing by as much as 30 percent during the first 10 minutes of smoking. Carbon monoxide in tobacco smoke exerts negative effects by reducing the blood's oxygen-carrying ability. Smoking also increases the chance of heart disease, stroke, atherosclerosis, and peripheral artery disease. Several ingredients of tobacco lead to the narrowing of blood vessels, increasing the likelihood of a blockage, and thus a heart attack or stroke. According to a study by an international team of researchers, people under 40 are five times more likely to have a heart attack if they are smokers. Exposure to tobacco smoke is known to increase oxidative stress in the body by various mechanisms, including depletion of plasma antioxidants such as vitamin C. Research by American biologists has shown that cigarette smoke also influences the process of cell division in the cardiac muscle and changes the heart's shape. Smoking tobacco has also been linked to Buerger's disease (thromboangiitis obliterans), the acute inflammation and thrombosis (clotting) of arteries and veins of the hands and feet. Although cigarette smoking causes a greater increase in the risk of cancer than cigar smoking, people who smoke cigars still have an increased risk for many health problems, including cancer, when compared to people who do not smoke.
Sources: en.wikipedia.org
== Hazards == Bottles of di-tert-butyl dicarbonate buildup of internal pressure in sealed containers caused by its slow decomposition to di-tert-butyl carbonate and ultimately tert-butanol and CO2 in the presence of moisture. For this reason, it is usually sold and stored in plastic bottles rather than glass ones. The main hazard of the reagent is its inhalational toxicity. Its median lethal concentration of 100 mg/m3 over 4 hours in rats is comparable to that of phosgene (49 mg/m3 over 50 min in rats).
=== Cartilage transplants === In 2021, researchers from Swansea University partnered with the Scar Free Foundation to bioprint 3D transplantable cartilage made of human stem cells and plant-based materials to give a 10-year-old girl an ear transplant. This method eliminated the need to retrieve cartilage from elsewhere on the patient's body.
== Chemistry == Propranolol is a racemic mixture of 2 enantiomers where the S(-)-enantiomer has approximately 100 times the binding affinity for beta adrenergic receptors. It is a propanolamine, a secondary amine and functionally related to 1-naphthol. Propranolol is highly lipophilic. The experimental log P of propranolol is 3.0 to 3.48 and its predicted log P ranges from 2.20 to 3.10.
On February 6, 2017, Duterte, citing continued attacks by the NPA on the military, formally terminated peace negotiations with the CPP-NPA-NDF, designated them as a terrorist organization and ordered the arrest of all NDF negotiators. Through an executive order he issued in December 2018, Duterte established the National Task Force to End Local Communist Armed Conflict (NTF-ELCAC), an inter-agency body that involved a whole-of-nation approach—from the national to local level— in addressing the root causes of communism. The NTF-ELCAC worked in close coordination with the military and focused on developing far-flung localities infiltrated by the NPA. Duterte also granted amnesty to former communist rebels and launched reintegration programs to support them and their families. Ultimately, in March 2019, he permanently terminated peace negotiations with the CPP-NPA-NDF, facilitating localized peace talks with the rebels. Duterte left office with the number of NPA guerrilla fronts in the country reduced from 89 to 23, and about 20,579 communist rebels reportedly surrendered from 2016 to 2021. Despite its success in reducing communist insurgency in the country, Duterte's administration was marred by numerous allegations of red-tagging, notably the left-leaning Makabayan Bloc; Duterte and the military dismissed the red-tagging accusations and argued the government was merely "identifying" them as communist fronts.
Sources: en.wikipedia.org
No. Cardarine has not received approval for human therapeutic use in major jurisdictions. It remains an investigational compound.
It is classified as a PPARδ agonist on the WADA Prohibited List. Anti-doping laboratories can detect it and its metabolites in urine. Its use is banned in competition and usually out of competition.
Rodent studies reported increased tumor incidence at multiple sites. The human relevance remains uncertain, but the findings contributed to discontinuation of development. No long-term human cancer data are available.
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.