fatty acid oxidation raises a handful of sensible questions. This page answers them in order, starting with the fundamentals and moving to applications.
This page was last updated on 2025-08-29 and is reviewed periodically as new material appears.
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.
Published literature on cardarine includes in vitro assays, rodent experiments, and a small number of human studies. Reports describe effects on exercise capacity and lipid metabolism in animals, while human evidence is sparse. Many online descriptions present the compound as a proven endurance aid, a claim not supported by regulatory approval or large clinical trials. Analytical studies focus on identifying the parent compound and its metabolites in biological samples. Important uncertainties include species differences, dose-response relationships, and the relevance of rodent tumor findings to humans.
Cardarine is the common name for GW501516, a synthetic compound studied as a peroxisome proliferator-activated receptor delta agonist. Researchers developed it to explore treatments for lipid disorders and metabolic conditions. It is not an approved medicine in any country. Early clinical work examined changes in HDL cholesterol and triglycerides, but development was discontinued after animal studies raised concerns about cancer. The compound remains available as a research chemical and appears in discussions of performance enhancement.
| Property | Value | Notes |
|---|---|---|
| Appearance | White to off-white powder | Visual description for typical solid reference material. |
| Solubility | Poorly soluble in water; soluble in DMSO | Solubility depends on solvent, purity, and form. |
| Storage | Cool, dry, protected from light | Long-term storage often uses low temperature and desiccant. |
| Common analytical method | LC-MS/MS | Used for detection and quantification in biological matrices. |
| Common synonyms | GW-501516; GW501516; endurobol | Naming varies among literature, vendors, and databases. |
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.
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.
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.
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.
Early clinical research explored GW501516 for lipid disorders, obesity, and diabetes. Some short-term human studies reported changes in HDL cholesterol, LDL cholesterol, and triglycerides. The development program was discontinued after rodent studies showed dose-dependent tumor formation in multiple tissues, including liver, bladder, stomach, and skin. These findings raised concerns about long-term cancer risk in humans. Because human exposure data are limited, the clinical significance of the rodent tumors remains uncertain.
Literature on cardarine often separates receptor pharmacology from toxicology. Mechanistic papers describe PPARδ activation and gene expression changes, while safety assessments focus on carcinogenicity and species differences. Questions remain about whether rodent tumors arise through PPARδ-dependent or off-target mechanisms. Another open area is how human metabolism and exposure compare with those in animal studies. Analytical methods such as liquid chromatography–mass spectrometry are used to confirm identity in biological and product samples.
GW501516 acts as an agonist at the peroxisome proliferator-activated receptor delta, a nuclear receptor that regulates gene expression. Activation shifts transcription toward genes involved in fatty acid uptake, oxidation, and energy expenditure. The compound does not bind the androgen receptor and therefore differs from anabolic steroids and SARMs. In rodent models, this metabolic shift has been linked to increased running endurance and reduced fat accumulation. The exact downstream pathways in humans remain incompletely characterized.
Diuretics act primarily by reducing the reabsorption of sodium at different sites of the renal tubular system and consequently promoting the elimination of sodium and water with increased urine output.
Boletus edulis, as the species epithet edulis (Latin: edible) indicates, is an edible mushroom. Italian chef and restaurateur Antonio Carluccio described it as representing "the wild mushroom par excellence", and hailed it as the most rewarding of all fungi in the kitchen for its taste and versatility. Considered a choice edible, particularly in France, Germany, Poland and Italy, it was widely written about by the Roman writers Pliny the Elder and Martial, although ranked below the esteemed Amanita caesarea. When he was served suilli instead of boleti, the disgruntled Martial wrote: sunt tibi boleti; fungos ego sumo suillos (Ep. iii. 60)("You eat the choice boletus, I have mushrooms that swine grub up.") The flavour of porcini has been described as nutty and slightly meaty, with a smooth, creamy texture, and a distinctive aroma reminiscent of sourdough. Young, small porcini are most appreciated, as the large ones often harbour maggots (insect larvae), and become slimy, soft and less tasty with age. The fruit bodies are collected by holding the stipe near the base and twisting gently. Cutting the stipe with a knife may risk the part left behind rotting and the mycelium being destroyed. Peeling and washing are not recommended. The fruit bodies are highly perishable, due largely to the high water content (around 90%), the high level of enzyme activity, and the presence of a flora of microorganisms.
Senna occidentalis, commonly known as coffee senna, styptic weed, or septicweed, is a species of flowering plant in the family Fabaceae and is native to the southern United States of America, Mexico and South America. It is a shrub with pinnate leaves, with three to seven pairs of broadly elliptic to egg-shaped leaflets, and yellow flowers arranged in groups of two to four, with six fertile stamens in each flower. It is an aggressive, pantropical weed.
==== Screening for ubiquitin ligase substrates ==== Deregulation of E3-substrate interactions is a key cause of many human disorders, therefore identifying E3 ligase substrates is crucial. In 2008, 'Global Protein Stability (GPS) Profiling' was developed to discover E3 ubiquitin ligase substrates. This high-throughput system made use of reporter proteins fused with thousands of potential substrates independently. By inhibition of the ligase activity (through the making of Cul1 dominant negative thus renders ubiquitination not to occur), increased reporter activity shows that the identified substrates are being accumulated. This approach added a large number of new substrates to the list of E3 ligase substrates.
In 1981, Frank D. Hickingbotham (b. 1936) opened the first TCBY in Little Rock, Arkansas. TCBY began franchising the following year, and had expanded to over 100 locations by 1984. Prior to 1984, the company's name was "This Can't Be Yogurt," but a lawsuit from a competitor, I Can't Believe It's Yogurt!, forced TCBY to create a new name from its initials, eventually using "The Country's Best Yogurt". TCBY began co-branding with Taco Bell, McDonald's, Subway, and Burger King in 1995. In 1991 TCBY moved into the tallest building in Arkansas, the forty-story Simmons Tower located in downtown Little Rock, and the building was renamed The TCBY Tower until 2000 when TCBY vacated. Mrs. Fields acquired TCBY in early 2000 and became Mrs. Fields Famous Brands. The combined company relocated headquarters to Broomfield, Colorado in 2012. TCBY was also present in Honduras, Costa Rica and Nicaragua for several years, but closed all of its branches. In 2001, there were 1,777 TCBY locations across the United States. By 2011, after several waves of closings, there were 405.
Sources: en.wikipedia.org
According to the author of the study there were 137 such events in Thailand during this period. Other ASEAN nations ranked in the study were Myanmar, ranked 3; Philippines, 5; and Vietnam, 8. Climate Change Performance Index (CCPI) 2017: Of 58 nations responsible for about 90% of global energy-related CO2 emissions, Thailand was ranked 42d in taking "action on climate protection" (1=best, 61=worst), earning an assessment of "poor". Other ASEAN nations ranked were Indonesia, 22 "good"; Malaysia, 44, "poor"; and Singapore, 54, "very poor". Global Climate Risk Index 2017: Thailand ranked number 10 of 180 nations most affected by "...weather-related loss events..." during the period 1996-2015 (1=most affected, 180=least affected) according to Germanwatch. Other ASEAN nations ranked in the top 10 were Myanmar, 2; Philippines, 5; and Vietnam, 8. Climate Central: Thailand is ranked seventh (higher number=lower risk) on the "Top 20 Most At-Risk Countries" for exposure to sea level rise and coastal flooding. It estimates the number of "People living on land that will be below sea level or chronic flood levels by the end of the century, assuming current emissions trends continue, and medium sensitivity of sea level to warming." In Thailand, eight million persons, or 12% of the population, are "at-risk" according to the study. Six of ASEAN's ten member-states are on the at-risk list. Climate Change Performance Index 2016: Thailand ranked 49 of 61 (1=best, 61=worst) countries, putting it in the "Very Poor" performance category.
Elevated ammonia can therefore be detected in patients with urea cycle disorders, as well as other conditions involving liver failure. Enzyme testing is performed for a wide range of metabolic disorders to confirm a diagnosis suspected based on screening tests.
DELs are subjected to affinity selection procedures on an immobilized target protein of choice, after which non-binders are removed by washing steps, and binders can subsequently be amplified by polymerase chain reaction (PCR) and identified by virtue of their DNA code (e.g.by DNA sequencing). In evolution-based DEL technologies hits can be further enriched by performing rounds of selection, PCR amplification and translation in analogy to biological display systems such as antibody phage display. This makes it possible to work with much larger libraries.
=== Evolution === The delicate skeletons of bats do not fossilise well; it is estimated that only 12% of bat genera that lived have been found in the fossil record. The oldest known bat fossils include Archaeonycteris praecursor and Altaynycteris aurora (55–56 million years ago), both known only from isolated teeth. The oldest complete bat skeletons are Icaronycteris gunnelli and Onychonycteris finneyi (52 million years ago), known from two skeletons discovered in Wyoming. The extinct bats Palaeochiropteryx and Hassianycteris from the Messel Pit of Germany, both of which lived 48 million years ago, are the first fossil mammals whose colouration has been discovered: both were reddish-brown. The largest known fossil bat known from a near-complete skeleton is Archaeopteropus (~33 million years ago) from Italy, which had a wingspan of about 82 to 90 centimetres (2.69 to 2.95 ft). Bats were formerly grouped in the superorder Archonta, along with the treeshrews (Scandentia), colugos (Dermoptera), and primates. Modern genetic evidence now places bats in the superorder Laurasiatheria, with its sister taxon as Ferungulata, which includes carnivorans, pangolins, odd-toed ungulates, and even-toed ungulates. One study places Chiroptera as a sister taxon to odd-toed ungulates (Perissodactyla).
Sources: en.wikipedia.org
Cardarine targets PPARδ, a nuclear receptor involved in lipid and energy metabolism. It does not bind the androgen receptor in the way SARMs do.
Most methods use liquid chromatography with tandem mass spectrometry. Urine is common in anti-doping testing, and blood or plasma may be used in research.
Typical guidance is cool, dry, dark storage, often at low temperature and with desiccant. Stability data are limited, so storage conditions should be verified for each batch or supplier.
Cardarine is a common name for the investigational compound GW501516. It acts as a PPARδ agonist and is not approved for human use. It is prohibited in sport.