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 2026-02-10 and is reviewed periodically as new material appears.
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.
In laboratory settings, cardarine is studied as a tool compound for probing PPARδ biology. Published experiments often use cell cultures, rodent models, or isolated tissues. Some investigations focus on metabolic effects, while others assess potential risks such as carcinogenicity observed in long-term animal studies. Because human trials are sparse, most knowledge comes from preclinical work and adverse event reports. Scientific literature frequently notes the gap between animal findings and human outcomes. The compound is not a dietary supplement and is not intended for human consumption.
Cardarine is a common name for GW501516, a synthetic compound developed in the 1990s through research collaborations involving GlaxoSmithKline. It belongs to a class of molecules known as peroxisome proliferator-activated receptor delta agonists. Early studies explored its effects on lipid metabolism and energy expenditure in animal models. The compound was never approved as a human medicine, and clinical development was discontinued. In the years since, it has appeared in fitness and bodybuilding communities as a performance-enhancing substance. Regulatory agencies classify it as an unapproved drug.
| Property | Value | Notes |
|---|---|---|
| IUPAC name | {4-[({4-methyl-2-[4-(trifluoromethyl)phenyl]-1,3-thiazol-5-yl}methyl)sulfanyl]phenoxy}acetic acid | Systematic name for GW501516 |
| CAS Registry Number | 317318-70-0 | Unique identifier for the parent compound |
| Molecular formula | C21H18F3NO3S2 | Includes carbon, hydrogen, fluorine, nitrogen, oxygen, and sulfur |
| Molecular weight | 453.5 g/mol | Approximate value for the neutral form |
| Appearance | White to off-white powder | Typical description for purified laboratory material |
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.
Anti-doping laboratories identify GW501516 and its metabolites using liquid chromatography-tandem mass spectrometry. Urine is the usual matrix, and detection can occur after the parent compound has cleared from blood. The exact detection window depends on dose, formulation, individual metabolism, and assay sensitivity. Because the compound is prohibited at all times, athletes are subject to testing in and out of competition. Analytical methods continue to improve as new metabolites and designer analogs are characterized.
GW501516 acts as a ligand for PPAR delta, a nuclear receptor that regulates transcription of genes involved in fatty acid oxidation and energy use. Activation of this receptor in skeletal muscle shifts metabolism toward fat burning in animal models. The compound does not burn fat directly; it changes gene expression over hours to days. Researchers study it to understand metabolic flexibility and exercise adaptation. Effects observed in rodents are not automatically expected in humans.
Laboratory handling focuses on identity, purity, and stability. Reference standards are typically stored cold and dry, protected from light, because solutions can degrade over time. Analytical checks may use high-performance liquid chromatography with ultraviolet detection or mass spectrometry. Impurities and related substances can be separated chromatographically and compared with a known standard. Because cardarine is not an approved drug, compendial monographs are absent, and laboratories often rely on in-house methods. Reported purity varies among unregulated products and should not be assumed from a label.
GW501516 binds and activates PPARδ, a nuclear receptor that influences transcription of genes involved in fatty acid oxidation and energy use. Activation shifts some metabolic pathways in preclinical models, which is why the compound has been studied for lipid disorders and exercise-related endpoints. The exact downstream effects in humans are incompletely mapped. PPARδ is expressed in many tissues, including skeletal muscle, liver, and adipose tissue, so broad activation may have varied consequences. Researchers continue to examine how selective or partial activation might alter the balance between benefits and risks.
Ipragliflozin (INN, trade names Suglat) is a pharmaceutical drug for treatment of type 2 diabetes. Ipragliflozin, jointly developed by Astellas Pharma and Kotobuki Pharmaceutical, was approved in Japan on January 17, 2014, and in Russia on May 22, 2019. Ipragliflozin is a Sodium/glucose cotransporter 2 (SGLT2) inhibitor (gliflozin). These membrane proteins are on the cell surface and transfer glucose into the cells. SGLT2 is one subtype of SGLTs and plays a key role in the reuptake of glucose in the proximal tubule of the kidneys. Ipragliflozin reduces blood glucose levels by inhibiting the reuptake of glucose by selectively inhibiting SGLT2.
=== Population monitoring === In the United States, the National Health and Nutrition Examination Survey (NHANES) has investigated habits of using dietary supplements in context of total nutrient intakes from the diet in adults and children. Over the period of 1999 to 2012, use of multivitamins decreased, and there was wide variability in the use of individual supplements among subgroups by age, sex, race/ethnicity, and educational status. Particular attention has been given to use of folate supplements by young women to reduce the risk of fetal neural tube defects.
=== Iminodisuccinic acid (IDS) === Commercially used since 1998, iminodisuccinic acid (IDS) biodegrades by about 80% after only 7 days. IDS binds to calcium exceptionally well and forms stable compounds with other heavy metal ions. In addition to having a lower toxicity after chelation, IDS is degraded by Agrobacterium tumefaciens (BY6), which can be harvested on a large scale. The enzymes involved, IDS epimerase and C−N lyase, do not require any cofactors.
From amphibians onward, bone management is biodynamic, with bone functioning as internal calcium reservoir under the control of osteoclasts via the combined action of parathyroid hormone and 1α,25-dihydroxyvitamin D3.
Noma (also known as gangrenous stomatitis or cancrum oris) is a rapidly-progressive and often-fatal gangrenous infection of the mouth and face. Noma usually begins as an ulcer on the gums and rapidly spreads into the jawbone, cheek, and facial soft tissues. This is followed by death of the facial tissues and fatal sepsis. Survivors are left with severe facial disfigurement often with impairments in breathing, swallowing, speaking, and vision. In 2023, Noma was added to the World Health Organization's list of neglected tropical diseases. This disease is linked to poverty and malnutrition; noma has also been seen in severely immunocompromised people in the developed world. It is preventable by proper nutrition and oral hygiene. Noma is most common in impoverished environments with poor healthcare infrastructure; as a result, many cases go undiagnosed, untreated, and unreported. It is an opportunistic infection linked to several microbes that take advantage of malnutrition and compromised immunity. There is no evidence of direct transmission from person to person. In the early stages, it can be treated effectively with antibiotics and nutrition supplements. If diagnosed early enough, there can be proper wound healing. After recovering, patients with disfigurement require complex surgical rehabilitation. There are no reliable estimates of its prevalence – in 1998 WHO estimated that there were 140,000 cases per year with a fatality rate of 90%.
Sources: en.wikipedia.org
The rhodophyte, or red algae, group is a large and diverse lineage. Rhodophyte chloroplasts are also called rhodoplasts, literally "red chloroplasts". Rhodoplasts have a double membrane with an intermembrane space and phycobilin pigments organized into phycobilisomes on the thylakoid membranes, preventing their thylakoids from stacking. Some contain pyrenoids. Rhodoplasts have chlorophyll a and phycobilins for photosynthetic pigments; the phycobilin phycoerythrin is responsible for giving many red algae their distinctive red color. However, since they also contain the blue-green chlorophyll a and other pigments, many are reddish to purple from the combination. The red phycoerythrin pigment is an adaptation to help red algae catch more sunlight in deep water—as such, some red algae that live in shallow water have less phycoerythrin in their rhodoplasts, and can appear more greenish. Rhodoplasts synthesize a form of starch called floridean starch, which collects into granules outside the rhodoplast, in the cytoplasm of the red alga.
== Other antibody binding proteins == In addition to protein A, other immunoglobulin-binding bacterial proteins such as protein G, protein A/G and protein L are all commonly used to purify, immobilize or detect immunoglobulins.
== Phylogenetics of cytochrome c == Cytochrome c is a highly conserved protein across the spectrum of eukaryotic species, found in plants, animals, fungi, and many unicellular organisms. This, along with its small size (molecular weight about 12,000 daltons), makes it useful in studies of cladistics. Cytochrome c has been studied for the glimpse it gives into evolutionary biology. Cytochrome c has a primary structure consisting of a chain of about 100 amino acids. Many higher-order organisms possess a chain of 104 amino acids. The sequence of cytochrome c in humans is identical to that of chimpanzees (our closest relatives), but differs from that of horses. Cytochrome c has an amino acid sequence that is highly conserved in eukaryotes, varying by only a few residues. In more than thirty species tested in one study, 34 of the 104 amino acids were conserved (identical at their characteristic position). For example, human cytochrome oxidase reacted with wheat cytochrome c, in vitro; which held true for all pairs of species tested. In addition, the redox potential of +0.25 volts is the same in all cytochrome c molecules studied.
The Federal Assembly of Yugoslavia, representing the FR Yugoslavia (1992–2003) was composed of two chambers: the Council of Citizens and the Council of Republics. Whereas the Council of Citizens served as an ordinary assembly, representing the people, the Council of Republics was made equally by representatives from the federation's constituent republics, to ensure federal equality between Serbia and Montenegro. The first president from 1992 to 1993 was Dobrica Ćosić, a former communist Yugoslav partisan during World War II and later one of the fringe contributors of the controversial Memorandum of the Serbian Academy of Sciences and Arts. Despite being head of the country, Ćosić was forced out of office in 1993 due to his opposition to Serbian President Slobodan Milošević. Ćosić was replaced by Zoran Lilić who served from 1993 to 1997, and then followed by Milošević becoming Yugoslav President in 1997 after his last legal term as Serbian president ended in 1997. The FR Yugoslavia was dominated by Milosevic and his allies, until the presidential election in 2000. There were accusations of vote fraud and Yugoslav citizens took to the streets and engaged in riots in Belgrade demanding that Milošević be removed from power. Shortly afterwards Milošević resigned and Vojislav Koštunica took over as Yugoslav president and remained president until the state's reconstitution as the State Union of Serbia and Montenegro.
Sources: en.wikipedia.org
Although nilutamide has been found to be effective for transgender hormone therapy, the use of nilutamide in the treatment of prostate cancer, and particularly for other indications that are of a less clinically serious nature, is now discouraged due to the unique adverse effects of the medication, most importantly a high incidence of interstitial pneumonitis. This is an adverse effect that can progress to pulmonary fibrosis and can potentially be fatal. Flutamide is also no longer recommended due to excessive risk of hepatotoxicity and liver failure in men with prostate cancer. For these reasons, newer and safer NSAAs like bicalutamide have largely replaced flutamide and nilutamide, and are now used for relevant indications instead. As selective AR antagonists, flutamide, nilutamide, and bicalutamide have the same mechanism of action, and bicalutamide has similar or greater efficacy to flutamide and nilutamide as an antiandrogen. Bicalutamide is known to have a small risk of elevated liver enzymes and serious liver toxicity. As a result, it is recommended that liver function tests (LFTs) periodically be performed. One protocol that has been recommended is to check LFTs at baseline, at one month, at two months, and then every 6 months thereafter. The risk of elevated liver enzymes and liver failure with bicalutamide appears to be much smaller than with high doses of CPA, which is the most widely used antiandrogen in transgender women in Europe and elsewhere in the world. However, only low doses of CPA are now recommended for use in transgender women.
"Eat Mor Chikin" is the chain's most prominent advertising slogan, created by The Richards Group in 1995. The slogan is often seen in advertisements featuring Holstein dairy cows that are often seen wearing (or holding) signs that (usually) read "Eat Mor Chikin" in capital letters. The ad campaign was temporarily halted on January 1, 2004, during a mad cow disease scare, so as not to make the chain seem insensitive or appear to be taking advantage of the scare to increase its sales. Two months later, the cows were put up again. The cows replaced the chain's old mascot, Doodles, an anthropomorphized chicken that still appears as the C on the logo. Chick-fil-A vigorously protects its intellectual property, sending cease and desist letters to those they think have infringed on their trademarks. The corporation has successfully protested at least 30 instances of the use of an "eat more" phrase, saying that the use would cause confusion of the public, dilute the distinctiveness of their intellectual property, and diminish its value. A 2011 letter to Vermont artist Bo Muller-Moore who screen prints T-shirts reading: "Eat More Kale" demanded that he cease printing the shirts and turn over his website. The incident drew criticism from Vermont governor Peter Shumlin, and created backlash against what he termed Chick-fil-A's "corporate bullying". On December 11, 2014, Bo Muller-Moore announced that the U.S. Patent Office granted his application to trademark his "Eat More Kale" phrase.
== History == In 1972 England's Whitbread company and the British Royal Naval Sailing Association agreed to sponsor a globe-circling regatta, which would be called the 'Whitbread Round the World Yacht Race'.
Here, Mr(X) is the relative molar mass, also called molecular weight or formula weight. For normal samples from Earth with typical isotope composition, the standard atomic weight or the conventional atomic weight can be used as an approximation of the relative atomic mass of the sample. Examples are:
Cantopop is a genre of Cantonese popular music which emerged in Hong Kong during the 1970s. Evolving from Shanghai-style shidaiqu, it is also influenced by Cantonese opera and Western pop. Local media featured songs by artists and bands such as Sam Hui, Anita Mui, Leslie Cheung, Alan Tam, Hacken Lee and Beyond; during the 1980s, exported films and shows exposed Cantopop to a global audience. The genre's popularity peaked in the 1990s, when the Four Heavenly Kings dominated Asian record charts. Despite a general decline since late in the decade, Cantopop remains dominant in Hong Kong; contemporary artists such as Eason Chan, Jackson Wang, Joey Yung, G.E.M., Tyson Yoshi, Twins and Mirror are popular in the territory and around the world. Western classical music has historically had a strong presence in Hong Kong and remains a large part of local musical education. The publicly funded Hong Kong Philharmonic Orchestra, the territory's oldest professional symphony orchestra, frequently hosts musicians and conductors from all over the world. The Hong Kong Chinese Orchestra, composed of classical Chinese instruments, is the leading Chinese ensemble and plays a significant role in promoting traditional music in the city. Hong Kong has never had a separate national anthem from the country that controlled it; its current official national anthem is therefore that of the People's Republic of China, "March of the Volunteers". The song "Glory to Hong Kong" has been used by protestors as an unofficial anthem of the city.
Sources: en.wikipedia.org
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.
It is prohibited by the World Anti-Doping Agency as a hormone and metabolic modulator. Athletes who test positive for GW501516 can face sanctions, including suspensions and loss of results.
Cardarine is a common or trade-style name, while GW501516 is the research code for the same chemical entity. Some sources also use Endurobol or GSK-516. The names refer to the same compound, not distinct drugs.
Cardarine is a common name for GW501516, a synthetic PPARδ agonist developed for research. It has not been approved as a medication in any country. It is classified as an unapproved drug and a prohibited substance in sport.