LC-MS/MS comes up often in conversation and rarely with the context attached. Here we lay out the basics in order, then work through the practical considerations.
Updated 2026-04-11. Numbers and descriptions here follow the published literature rather than marketing material.
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.
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.
| Property | Value | Notes |
|---|---|---|
| WADA classification | S4 Hormone and Metabolic Modulators | Prohibited at all times in sport. |
| Drug approval status | Not approved in major jurisdictions | No accepted therapeutic indication. |
| Common detection method | LC-MS/MS | Detects parent compound and metabolites. |
| Typical test matrix | Urine or blood | Urine is common in anti-doping testing. |
| Product labeling | Research chemical or supplement | Often not independently verified. |
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.
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.
Cardarine is prohibited in competitive sport under the World Anti-Doping Agency code, where it is classified as a metabolic modulator. It is not approved as a prescription medicine in the United States, European Union, or other major markets. Regulatory action has focused on its presence in sports and in products marketed as research chemicals. Because it has no accepted medical indication, supply is often unregulated. This status creates legal and safety uncertainties for anyone who encounters the substance.
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.
Published human data are sparse and mostly come from early-phase trials. Those studies examined short-term changes in lipids, glucose, and exercise capacity, but they were not large enough to establish efficacy or long-term safety. Some animal experiments reported increased running endurance, yet such findings do not prove a performance benefit in people. Anti-doping laboratories detect GW501516 and its metabolites in urine or blood using liquid chromatography-tandem mass spectrometry. Detection windows depend on dose, sample type, and individual metabolism. The method is sensitive enough to identify trace residues in tested samples.
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.
=== 2007–present: Software tools === In June 2007, Bio-Synthesis, Inc. unveiled a new online software tool called Protein Lounge which brought all of the vital and necessary databases to one place. The Protein Database contained all of the necessary information for proteins, such as datasheets, reviews, signaling pathway relation, disease relation, sequences, publications and reagent links. The database offered the most comprehensive gene/protein sequence pages which have all pertinent information needed to analyze any sequence.1 In January 2008, Bio-Synthesis, Inc. announced an exclusive scientific collaboration with Dr. Dante Marciani, a world-renowned expert in immune agonists. The collaboration was focused on proprietary novel glycosides that stimulate innate immunity while taking advantage of the synergistic effects between innate and adaptive immunity. In addition, the collaboration extended to proprietary compounds that down regulate The immunity, an area of significance in the treatment of chronic inflammatory conditions. 2 In May 2009, Bio-Synthesis, Inc. began Mitochondrial, or DNA, testing and offered it commercially. The DNA Identity Testing Laboratory at Bio-Synthesis, Inc. (BSI) is currently sequencing DNA samples for maternal lineage and criminal investigations.3 In February 2010, Bio-synthesis has been awarded a 2-year, $590,000, Small Business and Innovation Research (SBIR) Phase 1 grant from the National Institute of Allergy and Infectious Diseases (NIAID) of the National Institutes of Health (NIH).
==== Adverse effect ==== Benzodiazepines lead to central nervous system depression, resulting in common adverse effects like drowsiness, oversedation, light-headedness. Memory impairment can be a common adverse effect especially in elderly, hypersalivation, ataxia, slurred speech, psychomotor effects.
== Efficacy == Daptomycin has been shown to be non-inferior to standard therapies (nafcillin, oxacillin, flucloxacillin or vancomycin) in the treatment of bacteraemia and right-sided endocarditis caused by S. aureus. A study in Detroit, Michigan compared 53 patients treated for suspected MRSA skin or soft tissue infection with daptomycin against vancomycin, showing faster recovery (4 versus 7 days) with daptomycin. A 2022 systematic review and meta-analysis of seven studies enrolling 907 patients with MRSA bacteremia where vancomycin MIC exceeded 1 µg/mL found that daptomycin was associated with significantly lower all-cause mortality compared to vancomycin, with an odds ratio of 0.53 (95% CI 0.29–0.98), as well as higher rates of treatment success, with an odds ratio of 2.20 (95% CI 1.63–2.96). In Phase III clinical trials, limited data showed daptomycin to be associated with poor outcomes in patients with left-sided endocarditis. Daptomycin has not been studied in patients with prosthetic valve endocarditis or meningitis.
== Public consumption == The center at the Ames Research Center in California began researching how to allow visitors to taste astronaut food in 1973. They contacted American Outdoor Products and Backpacker's Pantry, the latter becoming a known source for freeze-dried meals like stews and even pasta dishes for serious campers and backpackers. NASA/AMES worked with American Outdoor Products to produce the world first freeze-dried ice cream and Astronaut Foods with the goal to allow people to see what space food tastes like.
Sources: en.wikipedia.org
Take potato slices, stew them with butter, chopped marjoram and parsley; simultaneously whisk four or five egg yolks with a little wine, pour them into the boiling potatoes, remove from heat and serve. (French: Autrement. Prennez la tartoufle par tranches, & mettez eſteuuer auec beurre, mariolaine haſchee, du persin : puis prennez quatre ou cinq iaulnes d'œuf battus auec vn peu de vin, & iettez le deſſus tout en bouillãt, & tirez arriere du feu, & seruez ainsi.)
=== Further reading === The Eighth Day of Creation: Makers of the Revolution in Biology. Touchstone Books, ISBN 0-671-22540-5. 2nd edition: Cold Spring Harbor Laboratory Press, 1996 paperback: ISBN 0-87969-478-5. Micklas, David. 2003. DNA Science: A First Course. Cold Spring Harbor Press: ISBN 978-0-87969-636-8. Rasmussen, Nicolas, Gene Jockeys: Life Science and the rise of Biotech Enterprise, Johns Hopkins University Press, (Baltimore), 2014. ISBN 978-1-42141-340-2. Rosenfeld, Israel. 2010. DNA: A Graphic Guide to the Molecule that Shook the World. Columbia University Press: ISBN 978-0-231-14271-7. Schultz, Mark and Zander Cannon. 2009. The Stuff of Life: A Graphic Guide to Genetics and DNA. Hill and Wang: ISBN 0-8090-8947-5. Watson, James. 2004. DNA: The Secret of Life. Random House: ISBN 978-0-09-945184-6.
In 1990, following cumulative $8.5 million donations by Bronx businessman Jack Resnick, Einstein's campus was designated as the Jack and Pearl Resnick Campus. Six years later, Einstein built a 10-story research complex, the Samuel H. and Rachel Golding Building. In 2002, the college opened the three-story Gruss Magnetic Resonance Research Center. Equipped with magnetic resonance equipment beyond conventional MRI, the center was one of six such facilities in the world upon opening. In 2008, Einstein opened a $225 million research complex, the Price Center. This expansion doubled the size of Einstein's campus to nearly 40 acres. Also that year, the college replaced its old logo—a "staid" portrait of Albert Einstein—with a stylized symbol that represents the helical structure of DNA, a notable spiral staircase on campus, and 'E' for Einstein. In 2024, Ruth Gottesman—a long-time professor at the medical school and head of the board of trustees—donated $1 billion to the school to make tuition free for all students in perpetuity. The contribution also stipulated that the college never change its name. The donation was one of the largest to any educational institution, and, according to The New York Times, likely the largest donation to any medical school.
Sources: en.wikipedia.org
Anti-doping laboratories typically use LC-MS/MS to detect GW501516 and its metabolites in urine. The method is sensitive and can identify the compound at low concentrations. Detection depends on sample timing, metabolism, and the specific assay.
Legality varies by country and context. It lacks marketing approval as a medicine in major countries. Sports organizations prohibit its use at all times.
A certificate of analysis may report identity, purity, and testing methods for a specific batch. It does not guarantee safety or legal status. Independent verification can confirm whether the material matches the label.
Cardarine targets PPARδ, a nuclear receptor involved in lipid and energy metabolism. It does not bind the androgen receptor in the way SARMs do.