This is a working overview of LC-MS/MS, written for readers who want more than a one-paragraph summary but less than a textbook.
This page was last updated on 2026-05-28 and is reviewed periodically as new material appears.
Cardarine is a common name for GW501516, an investigational compound developed in the 1990s for metabolic conditions. It acts as an agonist at peroxisome proliferator-activated receptor delta, a nuclear receptor involved in lipid and energy metabolism. The compound is frequently mislabeled as a selective androgen receptor modulator, or SARM, but its molecular target is different. GW501516 reached early clinical testing before development was discontinued. It has no approved therapeutic use in any country. The name cardarine is not a formal international nonproprietary name.
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.
Anti-doping laboratories detect GW501516 and its metabolites using liquid chromatography-tandem mass spectrometry. Urine is the most common matrix, though blood and dried blood spots may also be used in some programs. Detection depends on factors such as dose, timing, metabolism, and the sensitivity of the assay. Published methods describe limits of detection in the low nanogram per milliliter range for related compounds. Exact detection windows are not fixed for all situations and remain an area of ongoing study.
Products sold as cardarine have been found to contain incorrect compounds, variable amounts, or no active ingredient at all. Independent testing is required to verify identity and purity. Common analytical approaches include high-performance liquid chromatography, mass spectrometry, and nuclear magnetic resonance for structural confirmation. These methods can distinguish GW501516 from related PPAR agonists and from unrelated steroids. For regulators and researchers, such verification is central to interpreting both biological results and adverse event reports.
| 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 |
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.
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.
Detection of GW501516 in biological samples generally relies on liquid chromatography coupled with tandem mass spectrometry. Urine is a common matrix in anti-doping analysis, while blood or plasma may be used in research settings. Sample preparation can involve enzymatic hydrolysis, protein precipitation, or solid-phase extraction before instrumental analysis. Because the compound undergoes metabolism, assays may target the parent molecule, one or more metabolites, or both. Detection windows are not fixed; they depend on factors such as dose, route, individual metabolism, and assay sensitivity. Reference standards are required for accurate identification and quantification.
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.
Cardarine can be detected in biological samples and product materials using liquid chromatography coupled to tandem mass spectrometry (LC-MS/MS). The method separates compounds by chromatography and identifies them by mass-to-charge transitions, allowing low-level detection in urine or blood. Sample preparation often involves enzymatic hydrolysis, solid-phase extraction, or protein precipitation. Certified reference materials and isotope-labeled internal standards improve quantification. Detection windows depend on metabolism, matrix, and assay sensitivity, so no single universal window applies.
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.
=== Russell indices in Japan === Russell/Nomura equity indices for Japan (calculated with Nomura Securities Co., Ltd.) offer free-float adjusted broad market or style benchmarks for investors in that country.
The most important microscopic feature for identification of mushrooms is the spores. Their color, shape, size, attachment, ornamentation, and reaction to chemical tests often can be the crux of an identification. A spore often has a protrusion at one end, called an apiculus, which is the point of attachment to the basidium, termed the apical germ pore, from which the hypha emerges when the spore germinates. The cell walls of mushrooms are composed mainly of glucans and chitin. Glucans have potential roles in reserving energy, providing structure, cell-to-cell signaling, and cellular protection.
== Transformation == Burkholderia pseudomoallei can go through transformation. The bacteria is able to uptake a free plasmid using electroporation and the plasmid material will integrate into the host DNA when they are electrocompetent.
== Gliding scandals == During the 2020 Women's World Gliding Championships at Lake Keepit, Australia, the home team captain Terry Cubley (Executive Officer of the GFA) was charged with unsporting behaviour for hacking the official tracking system to bypass the mandatory 15 minute delay and forward real time competitors' positions to his team, granting a tactical advantage. An investigation revealed that Matt Gage had been closely involved with the developers of the tracking system, and was aware of an undocumented back door that allowed the team captain (Terry Cubley) to bypass the 15 minute delay. This real-time information was relayed by the team captain over the radio to the Australian pilots. This was the first time in the sport's history that an entire team had been penalised for unsporting behaviour, with the Competition Director applying a penalty of 25 points per pilot per day. Controversially the pilots involved were spared disqualification only receiving a relatively trivial points reduction (compared to a competing pilot who was disqualified for infringing airspace earlier in the competition). Following a subsequent GFA investigation two of the Australian Team admitted to cheating and the GFA made a formal apology to the FAI and the wider gliding community. Terry Cubley was removed from his role as Vice President of the IGC, but chose to remain as Executive Officer of the GFA . The pilots involved chose to appeal against this decision, resulting in the longest and most comprehensive investigation in the FAIs history.
Sources: en.wikipedia.org
A tumour vaccine can stimulate the body's immune system, upon exposure to a tumour-specific peptide antigen, by activation or amplification of a humoral and cytotoxic immune response targeted at the specific cancer cells. The study of Schumacher et al. has been shown that this attractive target (the mutation in the isocitrate dehydrogenase 1) from an immunological perspective represents a potential tumour-specific neoantigen with high uniformity and penetrance and could be exploited by immunotherapy through vaccination. Accordingly, some patients with IDH1-mutated gliomas demonstrated spontaneous peripheral CD4+ T-cell responses against the mutated IDH1 region with generation B-cell producing antibodies. Vaccination of MHC-humanized transgenic mice with mutant IDH1 peptide induced an IFN-γ CD4+ T-helper 1 cell response, indicating an endogenous processing through MHC class II, and production of antibodies targeting mutant IDH1. Tumour vaccination, both prophylactic and therapeutic, resulted in growth suppression of transplanted IDH1-expressing sarcomas in MHC-humanized mice. This in vivo data shows a specific and potent immunologic response in both transplanted and existing tumours.
== Overview == Spectrophotometry is a tool that hinges on the quantitative analysis of molecules depending on how much light is absorbed by colored compounds. Important features of spectrophotometers are spectral bandwidth (the range of colors it can transmit through the test sample), the percentage of sample transmission, the logarithmic range of sample absorption, and sometimes a percentage of reflectance measurement. A spectrophotometer is commonly used for the measurement of transmittance or reflectance of solutions, transparent or opaque solids, such as polished glass, or gases. Although many biochemicals are colored, as in, they absorb visible light and therefore can be measured by colorimetric procedures, even colorless biochemicals can often be converted to colored compounds suitable for chromogenic color-forming reactions to yield compounds suitable for colorimetric analysis. However, they can also be designed to measure the diffusivity on any of the listed light ranges that usually cover around 200–2500 nm using different controls and calibrations. Within these ranges of light, calibrations are needed on the machine using standards that vary in type depending on the wavelength of the photometric determination. An example of an experiment in which spectrophotometry is used is the determination of the equilibrium constant of a solution. A certain chemical reaction within a solution may occur in a forward and reverse direction, where reactants form products and products break down into reactants.
In certain situations where strong electroosmotic flow toward the cathode is undesirable, the inner surface of the capillary can be coated with polymers, surfactants, or small molecules to reduce electroosmosis to very low levels, restoring the normal direction of migration (anions toward the anode, cations toward the cathode). CE instrumentation typically includes power supplies with reversible polarity, allowing the same instrument to be used in "normal" mode (with EOF and detection near the cathodic end of the capillary) and "reverse" mode (with EOF suppressed or reversed, and detection near the anodic end of the capillary). One of the most common approaches to suppressing EOF, reported by Stellan Hjertén in 1985, is to create a covalently attached layer of linear polyacrylamide. The silica surface of the capillary is first modified with a silane reagent bearing a polymerizable vinyl group (e.g. 3-methacryloxypropyltrimethoxysilane), followed by introduction of acrylamide monomer and a free radical initiator. The acrylamide is polymerized in situ, forming long linear chains, some of which are covalently attached to the wall-bound silane reagent. Numerous other strategies for covalent modification of capillary surfaces exist. Dynamic or adsorbed coatings (which can include polymers or small molecules) are also common. For example, in capillary sequencing of DNA, the sieving polymer (typically polydimethylacrylamide) suppresses electroosmotic flow to very low levels.
Sources: en.wikipedia.org
i.e., independently from the initial size of the susceptible population the disease can never cause a proper epidemic outbreak. As a consequence, it is clear that both the basic reproduction number and the initial susceptibility are extremely important.
Parliament votes to suspend Te Pāti Māori MPs Hana-Rāwhiti Maipi-Clarke for seven days, Rawiri Waititi and Debbie Ngarewa-Packer for 21 days for their performance of a haka against their opponents during a parliamentary debate over the Treaty Principles Bill. Michael Forbes, the deputy press secretary to Prime Minister Christopher Luxon, resigns after being accused of illegally photographing, filming and recording women including sex workers. 6 June: Damage to one of Chorus Limited's ethernet routers causes widespread Internet outages in Wellington and parts of the lower North Island. The SkyCity Entertainment Group sues Fletcher Building and Fletcher Construction for NZ$330 million on the grounds that the companies had breached their contract to build the New Zealand International Convention Centre at SkyCity Auckland within three years. The Fletcher Group has confirmed they would contest the lawsuit. 10 June — Lawyers for Climate Action NZ and the Environmental Law Initiative sue the New Zealand Government at the Wellington High Court over its allegedly "dangerously inadequate" plan to reduce carbon emissions to net zero by 2050. 11 June: Te Ahu a Turanga – Manawatū Tararua Highway opens to all traffic, after a formal opening ceremony on 7 June. A tornado-like squall causes power outages in the Taranaki region.
== Other == Civic Democratic Party (Czech: Občanská demokratická strana) Civic Democratic Party (Slovakia) (Slovak: Občianska demokratická strana) Odesa International Airport, an airport in Odesa, Ukraine (IATA code ODS) L'Officiel du jeu Scrabble, the reference dictionary for Scrabble in French-speaking countries One Day School, a gifted education program in New Zealand. Operating Deflection Shape, a method used for visualisation of the vibration pattern of a machine Ordbog over det danske Sprog, a dictionary of Danish Overdoses (especially drug overdoses) In Liverpool in England, Old Dock Sill Orbital Dysfunctional Syndrome from the film Pandorum Occupy Dame Street, a protest in Dublin, Ireland in 2011–12
CrmA increases infectivity by suppressing its host's inflammatory response through inhibition of IL-1 and IL-18 processing by the cysteine protease caspase-1. In eukaryotes, a plant serpin inhibits both metacaspases and a papain-like cysteine protease.
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, but cardarine is not approved as a medicine in major jurisdictions. It is often sold as a research chemical, a category that may not be lawful for human use. Buyers should check local laws and product labels carefully.