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 2026-05-22. Where a claim depends on a specific study, the study is described rather than over-claimed.
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.
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 |
|---|---|---|
| Regulatory status | Prohibited in sport; not approved as medicine | Listed by WADA at all times. |
| Common synonyms | GW501516, GW-501516, endurobol | Cardarine is a colloquial name. |
| Typical analytical method | LC-MS/MS | Detects parent compound and metabolites. |
| Common test matrix | Urine | Blood and dried blood spots also possible. |
| Legal classification | Varies by country | Often treated as unapproved drug or research chemical. |
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.
Handling and quality assessment of cardarine reference material follow general laboratory practices for poorly characterized compounds. It typically appears as a white to off-white powder and is sparingly soluble in water but soluble in organic solvents such as dimethyl sulfoxide and ethanol. Storage recommendations usually specify a cool, dry, dark place, with long-term storage at low temperature and desiccation. Purity may be checked by high-performance liquid chromatography with ultraviolet detection, while identity is confirmed by mass spectrometry and nuclear magnetic resonance. No pharmacopeial monograph exists, so reported purity and stability depend on the supplier’s methods.
GW501516 acts as a selective agonist at PPARδ, a nuclear receptor that regulates transcription of genes involved in lipid handling and energy metabolism. Activation of PPARδ in preclinical models increases fatty acid oxidation, mitochondrial biogenesis, and exercise endurance in rodents. These effects have made the compound a subject of metabolic research and also a target for sport anti-doping rules. In humans, however, controlled studies are limited, and whether similar endurance or metabolic changes occur at tolerated exposures remains an open question. The receptor’s broad tissue distribution also means downstream effects may vary by organ and condition.
==== 4.C Acyl CoA ligase-coupled transporters ==== 4.C.1 The Proposed Fatty Acid Transporter (FAT) Family 4.C.2 The Carnitine O-Acyl Transferase (CrAT) Family 4.C.3 The Acyl-CoA Thioesterase (AcoT) Family
=== Cell cycle === TGF-β plays a crucial role in the regulation of the cell cycle by blocking progress through G1 phase. TGF-β causes synthesis of p15 and p21 proteins, which block the cyclin:CDK complex responsible for retinoblastoma protein (Rb) phosphorylation. Thus, TGF-β blocks advancement through the G1 phase of the cycle. In doing so, TGF-β suppresses expression of c-myc, a gene which is involved in G1 cell cycle progression.
In presence of a β-hydrogen, a selenide will give an elimination reaction after oxidation, to leave behind an alkene and a SeO-selenoperoxol. The SeO-selenoperoxol is highly reactive and is not isolated as such. In the elimination reaction, all five participating reaction centers are coplanar and, therefore, the reaction stereochemistry is syn. Oxidizing agents used are hydrogen peroxide, ozone or MCPBA. This reaction type is often used with ketones leading to enones. An example is acetylcyclohexanone elimination with benzeneselenylchloride and sodium hydride.
== Biosynthesis == Patellamide A originates from a ribosomal peptide, making it a member of the RiPP superfamily of natural products. This was determined after genome sequencing of P. didemi showed a lack of non ribosomal peptide synthetases. The biosynthetic gene cluster for patellamide A contains the genes patA, patB, patC, patD, patE, patF and patG. These genes, when introduced into E. coli, cause the production of patellamide A, definitively confirming their responsibility for patellamide A biosynthesis. The gene patE encodes the precursor peptide that contains the primary sequences of patellamides A and C. It has been proposed by Schmidt et al. that this prepatellamide is heterocyclized to form the oxazoline and thiazoline rings by PatD2. It is proposed that PatG1 is subsequently involved in oxidizing the thiazoline rings to the thiazole rings found in patellamide A. The peptide is then cleaved, possibly by PatA or PatG2, and cyclized, the cyclization is likely aided by adenylation by PatD1, forming the two cyclic peptides, patellamides A and C. Although all the amino acids used in the production of patellamide A are L-amino acids, some of the amino acids found in natural patellamide A are the D-epimers. It is proposed that epimerization of these amino acids occurs spontaneously. This was determined by comparison to a similar system, lissoclinamide 7.
Sources: en.wikipedia.org
Potassium-40 is especially important in potassium–argon (K–Ar) dating. Argon is a gas that does not ordinarily combine with other elements. So, when a mineral forms – whether from molten rock, or from substances dissolved in water – it will be initially argon-free, even if there is some argon in the liquid. However, if the mineral contains traces of potassium, then decay of the 40K isotope present will create fresh argon-40 that will remain locked up in the mineral. Since the rate at which this conversion occurs is known, it is possible to determine the elapsed time since the mineral formed by measuring the ratio of 40K and 40Ar atoms contained in it. The argon in Earth's atmosphere is 99.6% 40Ar, but the argon in the Sun – and presumably in the primordial material that condensed into the planets – is mostly 36Ar, with less than 15% of 38Ar. It follows that most of Earth's argon derives from potassium-40 that decayed into argon-40, which eventually escaped to the atmosphere.
Friedel-Crafts acylation of the n-butyl ether of thiophenol with benzoyl chloride gives the corresponding benzophenone. Reduction of the ketone with zinc/NaOH followed by treatment with HCl in ether affords the benzhydryl chloride. Displacement of the halogen with thiourea gives, by reaction of the last at its most nucleophilic center, the isothiouronium salt. Hydrolysis of the salt leads to the sulfur analog of a benzhydrol. Alkylation of the sodium salt of this last with N-(2-chloroethyl)dimethylamine affords captodiame.
== Reception == For his portrayal of Ari, Kipa-Williams received a nomination for Best Daytime Star at the 2020 Inside Soap Awards. A writer for TVNZ was "thrilled" with the introduction of the Parata family and their connection to New Zealand. They believed that the family would "embody a taste of home, and we can't wait to see what Summer Bay has in store for them!" Kerry Harvey of Stuff pointed out that Paratas were "being hailed as New Zealand's answer to the show's much-loved River Boys". Bethany Reitsma of The New Zealand Herald believed that the Paratas would bring "a taste of classic Kiwi humour" to Home and Away. She also reported that New Zealand viewers were excited about a "Kiwi family" joining the show. Nick Everard and Jenny Ky from The Morning Show stated the Parata's arrival "rocked" Home and Away and their addition made "Summer Bay sizzle – and the fans can't get enough." Rachel Lucas from What's on TV observed that Ari "certainly makes an impact during the hospital siege". While an Inside Soap columnist joked "If he's looking for peace and quiet, Ari has come to the wrong place! His new life in the Bay will probably turn out to be even more dramatic than the past he’s running from". Tahlia Pritchard from Punkee enjoyed Tane and Ari facing off against each other, calling it "the most compelling TV I've watched all iso." She also thought it was "hot" and found Tane and Ari to be "reminiscent of the River Boys but, well, sexier and with no shit tattoos." Stephanie McKenna of The West Australian branded Ari a "popular character".
The use of animal gut strings by musicians can be traced back to the third dynasty of Egypt. In the recent past, strings were made out of lamb gut. With the advent of the modern era, musicians have tended to use strings made of silk, or synthetic materials such as nylon or steel. Some instrumentalists, however, still use gut strings in order to evoke the older tone quality. Although such strings were commonly referred to as "catgut" strings, cats were never used as a source for gut strings. Sheep gut was the original source for natural gut string used in racquets, such as for tennis. Today, synthetic strings are much more common, but the best gut strings are now made out of cow gut. Gut cord has also been used to produce strings for the snares that provide a snare drum's characteristic buzzing timbre. While the modern snare drum almost always uses metal wire rather than gut cord, the North African bendir frame drum still uses gut for this purpose. "Natural" sausage hulls, or casings, are made of animal gut, especially hog, beef, and lamb. The wrapping of kokoretsi, gardoubakia, and torcinello is made of lamb (or goat) gut. Haggis is traditionally boiled in, and served in, a sheep stomach. Chitterlings, a kind of food, consist of thoroughly washed pig's gut. Animal gut was used to make the cord lines in longcase clocks and for fusee movements in bracket clocks, but may be replaced by metal wire. The oldest known condoms, from 1640 AD, were made from animal intestine.
=== Australia === Dialysis is provided without cost to all patients through Medicare, with 75% of all dialysis being administered as haemodialysis to patients three times per week in a dialysis facility. The Northern Territory has the highest incidence rate per population of haemodialysis, with Indigenous Australians having higher rates of Chronic Kidney Disease and lower rates of functional kidney transplants than the broader population. The remote Central Australian town of Alice Springs, despite having a population of approximately 25000, has the largest dialysis unit in the Southern Hemisphere. Many people must move to Alice Springs from remote Indigenous communities to access health services such as haemodialysis, which results in housing shortages, overcrowding, and poor living conditions.
Sources: en.wikipedia.org
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.
Laboratories use liquid chromatography-tandem mass spectrometry to detect GW501516 and its metabolites. Urine is commonly tested, and testing can occur in and out of competition.
No, cardarine is not a SARM. It is a PPARδ agonist, which acts on a different receptor. The two classes are often confused in online discussions.
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.