preclinical models is one of those subjects where the details matter more than the headlines. This page pulls together the background, the mechanisms, and the practical points readers ask about most.
Updated 2026-07-05. Numbers and descriptions here follow the published literature rather than marketing material.
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.
Safety discussions about cardarine frequently cite rodent carcinogenicity findings reported in the 2000s. In those studies, treated animals developed tumors at multiple sites, leading sponsors to discontinue clinical development. The relevance of these findings to humans has not been resolved, but they are a major reason the compound is not approved. Current literature emphasizes uncertainty about long-term effects and the risks of unregulated use. Regulators and health agencies have not established a safe human exposure level.
Cardarine is a synthetic compound also known as GW501516, GW-501516, and sometimes endurobol. It was developed as a selective agonist of peroxisome proliferator-activated receptor delta, a nuclear receptor involved in fatty acid oxidation and energy metabolism. The compound was studied in preclinical models for metabolic and cardiovascular conditions, but it did not become a marketed human medicine. In regulatory and anti-doping contexts, it is treated as a prohibited substance rather than a licensed medicine.
| 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 |
In the fitness and bodybuilding literature, cardarine is frequently discussed as an endurance agent or fat-loss compound, although such claims are not supported by robust clinical evidence. Online descriptions often mix animal data, user anecdotes, and marketing language. Researchers who study PPARδ agonists distinguish between receptor activation in controlled experiments and unsupervised use of unverified products. The latter introduces unknown purity, dose, and interactions, making reported experiences difficult to interpret scientifically.
GW501516 acts as an agonist at peroxisome proliferator-activated receptor delta, a nuclear receptor involved in transcription of genes related to lipid handling and energy use. Activation of PPARδ can shift skeletal muscle toward greater fatty acid oxidation in animal models, which is one reason it drew interest for metabolic disease and exercise research. The exact downstream effects depend on tissue, species, dose, and duration. Human data are sparse, so many proposed benefits remain hypotheses rather than established clinical outcomes.
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.
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.
Analytical laboratories typically identify cardarine and its metabolites using liquid chromatography-tandem mass spectrometry. Urine is a common matrix in anti-doping testing, while blood and tissue may be used in research settings. Detection windows depend on the assay, the sample matrix, and the compound's metabolism. Because cardarine is extensively metabolized, laboratories often target specific metabolites to improve sensitivity and confirmation. Reference standards are required for reliable quantification. Method validation includes checks for selectivity, linearity, and carryover.
A persistent misconception is that cardarine is a fat-burning drug or a safe alternative to anabolic steroids. No approved therapeutic product exists, and human safety data are limited. The tumor findings in rodents remain a central concern in scientific reviews. Products sold online may contain inaccurate labels, impurities, or different compounds entirely, which complicates any assessment of effects. Independent testing of such products has reported frequent mislabeling. For these reasons, discussions in the literature emphasize risks and unknowns rather than benefits.
Cardarine is not approved for human therapeutic use in any major jurisdiction. It appears on the World Anti-Doping Agency Prohibited List as a PPARδ agonist within the hormone and metabolic modulators category. Sports organizations test for it because it has been detected in athlete samples and seized products. Regulatory actions against marketed research chemical versions have occurred in several countries, though enforcement varies. Availability through unregulated channels complicates oversight.
Metabolites of MDMA that have been identified in humans include 3,4-methylenedioxyamphetamine (MDA), 4-hydroxy-3-methoxymethamphetamine (HMMA), 4-hydroxy-3-methoxyamphetamine (HMA), 3,4-dihydroxyamphetamine (DHA) (also called alpha-methyldopamine (α-Me-DA)), 3,4-dhydroxymethamphetamine (HHMA), 3,4-methylenedioxyphenylacetone (MDP2P), and 3,4-methylenedioxy-N-hydroxyamphetamine (MDOH). The contributions of these metabolites to the psychoactive and toxic effects of MDMA are an area of active research. 80% of MDMA is metabolised in the liver, and about 20% is excreted unchanged in the urine. MDMA is known to be metabolized by two main metabolic pathways: (1) O-demethylenation followed by catechol-O-methyltransferase (COMT)-catalyzed methylation or glucuronide/sulfate conjugation; and (2) N-dealkylation, deamination, and oxidation to the corresponding benzoic acid derivatives conjugated with glycine. The metabolism may be primarily by cytochrome P450 (CYP450) enzymes CYP2D6 and CYP3A4 and COMT. Complex, nonlinear pharmacokinetics arise via autoinhibition of CYP2D6 and CYP2D8, resulting in zeroth order kinetics at higher doses. It is thought that this can result in sustained and higher concentrations of MDMA if the user takes consecutive doses of the drug.
The novel is permeated by poetological, often self-deprecating reflections, which are discussed in the form of possible objections Jutta or the editor might raise against the novel—and which culminate in an emphatic endorsement of the power of literature.
Together with Central Michigan University, ASMT provided graduate programs for laboratorians to earn master's degrees in administration or education. The ASMT launched its Future Directions Plan, and Statements of Competence. ASMT initiated the formation of the National Certification Agency (NCA) to advance "certification for the profession, by the profession." In the 1980s, the organization sponsored the Clinical Laboratory Educators Conference (CLEC) and the Legislative Symposium. ASMT also moved its offices from Houston, Texas, to Washington, D.C., to become more involved in influencing legislation to advance the profession. During the 1990s, ASMT changed its name to ASCLS and joined forces with the American Association for Clinical Chemistry (AACC) to hold one of the largest annual meetings of laboratorians in the country. In 1995, the National Labor Relations Board recognized medical technologists among its "professional employees."
== Early life == He was born in Fort Worth, Texas, on 15 July 1921, the only son of George E. Merrifield and Lorene née Lucas. In 1923 the family moved to California where he attended nine grade schools and two high schools before graduating from Montebello High School in 1939. It was there that he developed an interest both in chemistry and in astronomy. After two years at Pasadena Junior College he transferred to the University of California at Los Angeles (UCLA). After graduation in chemistry he worked for a year at the Philip R. Park Research Foundation taking care of an animal colony and assisting with growth experiments on synthetic amino acid diets. One of these was the experiment by Geiger using the law of the minimum that first demonstrated that the essential amino acids must be present simultaneously for growth to occur. He returned to graduate school at the UCLA chemistry department with professor of biochemistry M.S. Dunn to develop microbiological methods for the quantitation of the pyrimidines. The day after graduating on 19 June 1949, he married Elizabeth Furlong and the next day left for New York City and the Rockefeller Institute for Medical Research.
Alamosaurus) as a biostratigraphic marker of the Hall Lake Formation fauna makes the dating problematic due to the fossil having a huge variability in assumed sedimentation rates. The study also suggested the uncertainty in the morphology of T. mcraeensis holotype being reliably outside the known variation of T. rex. Regardless of the age and validity of T. mcraeensis, the authors concluded that the genus Tyrannosaurus still most likely originated from Laramidia and that the ancestors of this genus possibly migrated from Asia. Later that year, Voris and colleagues regarded T. mcraeensis as a junior synonym of T. rex, agreeing with the problematic stratigraphic data and finding all of the proposed diagnostic characters of T. mcraeensis to be in the known T. rex specimen range of variation. In his study of the T. rex holotype skull, Carr also did not regard T. mcraeensis as a valid species, agreeing with the proposed characters of the T. mcraeensis holotype being visible throughout the hypodigm of T. rex.
Sources: en.wikipedia.org
== Laboratory identification == GBS grows readily on blood agar plates as colonies surrounded by a narrow zone of β-hemolysis. GBS is characterized by the presence in the cell wall of the antigen group B of Lancefield classification (Lancefield grouping) that can be detected directly in intact bacteria using latex agglutination tests. The CAMP test is also another important test for the identification of GBS. The CAMP factor produced by GBS acts synergistically with the staphylococcal β-hemolysin, inducing enhanced hemolysis of sheep or bovine erythrocytes. GBS is also able to hydrolyze hippurate, and this test can also be used to identify presumptively GBS. Hemolytic GBS strains produce an orange-brick-red non-isoprenoid polyene (ornithine rhamnolipid) pigment (granadaene) when cultivated on granada medium that allows its straightforward identification. GBS can also be identified using MALDI-TOF (Matrix Assisted Laser Desorption/Ionization-Time of Flight) instruments.GBS colonies can additionally be identified tentatively after their appearance in chromogenic agar media; nevertheless, GBS-like colonies that develop in chromogenic media should be confirmed as GBS using additional reliable tests (e.g., latex agglutination or the CAMP test) to avoid potential misidentification. A summary of the laboratory techniques for GBS identification is depicted in Ref 7.
Duterte and Zimmerman have been on good terms in recent years, with Zimmerman stating: "Yes, [Rodrigo] is really a very good leader. That is all he is. But when it comes to family, he is not capable of taking care of it." His daughter, Sara, characterized her family as "broken", calling her relationship with her father as "not very close" up to the time she became mayor in 2010. Prior to his arrest, Duterte had been living with his common-law wife Cielito "Honeylet" Avanceña, a businesswoman and former nurse, with whom he has one daughter named Veronica ("Kitty"), an American by birth. Duterte has eleven grandchildren, half of whom are Muslims and the other half Christian, and two great-grandchildren. Since 2022, a child named Mira ("Mimi", born 2019) is seen being raised by Duterte and Avanceña alongside Veronica, though there are conflicting reports on whether she is a child or a grandchild of Duterte. Veronica attributes her rose tattoo to Mira. On his paternal side, Duterte shares familial ties with some of the prominent families of the Visayas, particularly the Almendrases and Duranos of Danao, Cebu. His distant uncle, former Senator Alejandro Almendras, was one of his original supporters when he first ran for mayor of Davao City in 1988.
== Definition == In animal studies, maximum span is often taken to be the mean life span of the most long-lived 10% of a given cohort. By another definition, however, maximum life span corresponds to the age at which the oldest known member of a species or experimental group has died. Calculation of the maximum life span in the latter sense depends upon the initial sample size. Maximum life span contrasts with mean life span (average life span, life expectancy), and longevity. Mean life span varies with susceptibility to disease, accident, suicide and homicide, whereas maximum life span is determined by "rate of aging". Longevity refers only to the characteristics of the especially long lived members of a population, such as infirmities as they age or compression of morbidity, and not the specific life span of an individual.
Taco Bell opened its first Philippine branch in October 2004, at the Gateway Mall in Cubao, Quezon City. The Philippine franchisee is PPI Holdings, Inc. As of 2026, there are 12 outlets in the country, all in Metro Manila.
== Potential Health benefits == PRP-rich preparations from bovine colostrum have shown possible efficacy against various illnesses including neurodegenerative diseases (such as Alzheimer's), viral infections, and ailments characterized by an overactive immune system, such as allergies, asthma and autoimmune diseases. Some recent research has also indicated possible efficacy in combating obesity.
Sources: en.wikipedia.org
Hyperprolactinaemia (also spelled hyperprolactinemia) is a condition characterized by abnormally high levels of prolactin in the blood. In women, normal prolactin levels average to about 13 ng/mL, while in men, they average 5 ng/mL. The upper normal limit of serum prolactin is typically between 15 and 25 ng/mL for both men and women. Levels exceeding this range indicate hyperprolactinemia. Prolactin (PRL) is a peptide hormone produced by lactotroph cells in the anterior pituitary gland. It plays a vital role in lactation and breast development. Hyperprolactinemia, characterized by abnormally high levels of prolactin, may cause galactorrhea (production and spontaneous flow of breast milk), infertility, and menstrual disruptions in women. In men, it can lead to hypogonadism, infertility and erectile dysfunction. Prolactin is crucial for milk production during pregnancy and lactation. Together with estrogen, progesterone, insulin-like growth factor-1 (IGF-1), and hormones from the placenta, prolactin stimulates the proliferation of breast alveolar elements during pregnancy. However, lactation is inhibited during pregnancy due to elevated estrogen levels. After childbirth, the rapid decline in estrogen and progesterone levels allows lactation to begin. Unlike most tropic hormones released by the anterior pituitary gland, prolactin secretion is primarily regulated by hypothalamic inhibition rather than by negative feedback from peripheral hormones.
"National" organizations operating outside their original homelands. WOSM's conference admitted and recognised the exile Russian Scouts as the "Representatives of Russian Scouting in Foreign Countries" on 30 August 1922 and the Armenian Scouts in France were recognized as a "National Movement on Foreign Soil" on 30 April 1929. Small, non-voting associations. The International Boy Scouts of the Canal Zone, a group in Panama with Scouts that claimed British and not Panamanian nationality was originally placed under the Boy Scouts of America's Canal Zone Council but, in 1947, was transferred under WOSM's bureau. The group had over 900 members in 1957 and existed as a directly registered group until the late 60s. The Boy Scouts of the United Nations began in 1945 and for years there was an active Boy Scouts of the United Nations with several troops at Parkway Village in New York City but only 14 members in 1959. Both the International Boy Scouts of the Canal Zone and the Boy Scouts of United Nations have long since disbanded. Directly registered "mixed-nationality Troops" were registered after discussions concerning such troops took place at WOSM's 3rd conference in 1924 at which WOSM's bureau was authorized to directly register such groups. It seems that the discussion at WOSM's 1924 conference was, at least in part, prompted by a letter to Baden-Powell from the Scoutmaster of one such troop in Yokohama, Japan. Janning's troop became the first troop directly registered by WOSM's bureau.
=== Analytical reagent === Several chemical tests utilize copper sulfate. It is used in Fehling's solution and Benedict's solution to test for reducing sugars, which reduce the soluble blue copper(II) sulfate to insoluble red copper(I) oxide. Copper(II) sulfate is also used in the Biuret reagent to test for proteins. Copper sulfate is used to test blood for anemia. The blood is dropped into a solution of copper sulfate of known specific gravity—blood with sufficient hemoglobin sinks rapidly due to its density, whereas blood which sinks slowly or not at all has an insufficient amount of hemoglobin. Clinically relevant, however, modern laboratories utilize automated blood analyzers for accurate quantitative hemoglobin determinations, as opposed to older qualitative means. In a flame test, the copper ions of copper sulfate emit a deep green light, a much deeper green than the flame test for barium.
The periplasm is a concentrated gel-like matrix in the space between the inner cytoplasmic membrane and the bacterial outer membrane called the periplasmic space in Gram-negative (more accurately "diderm") bacteria. Using cryo-electron microscopy it has been found that a much smaller periplasmic space is also present in Gram-positive bacteria (more accurately "monoderm"), between cell wall and the plasma membrane. The periplasm may constitute up to 40% of the total cell volume of gram-negative bacteria, but is a much smaller percentage in gram-positive bacteria.
== Lead-like == During drug discovery, lipophilicity and molecular weight are often increased in order to improve the affinity and selectivity of the drug candidate. As a result, it is often difficult to maintain drug-likeness (i.e., RO5 compliance) during hit and lead optimization. To solve this problem, it has been proposed that members of screening libraries from which hits are discovered should be biased toward lower molecular weight and lipophilicity so that medicinal chemists will have an easier time in delivering optimized drug development candidates that are also drug-like. Hence the rule of five has been extended to the rule of three (RO3) for defining lead-like compounds. A rule of three compliant compound is defined as one that has:
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.
Cardarine is an investigational synthetic compound that acts as a PPARδ agonist. It is also known as GW501516 and has been studied mainly in preclinical research. It is not an approved medicine.