If you have been reading about Laboratory compound and want a single page that covers the useful parts, this is it: definitions, context, how it is studied, and the questions that come up repeatedly.
Last reviewed on 2026-03-20. Where a claim depends on a specific study, the study is described rather than over-claimed.
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.
Stability of GW501516 depends on form, temperature, light exposure, and moisture. Solid reference material is typically stored frozen or refrigerated in a desiccator and protected from light. Solutions in organic solvents such as dimethyl sulfoxide are often kept frozen in aliquots to reduce freeze-thaw cycling. Aqueous solubility is low, so aqueous stock solutions can be difficult to prepare without cosolvents. Degradation may appear as changes in chromatographic purity or mass spectral signal. Stability studies are needed to establish shelf life for any specific preparation.
Quality assessment for cardarine samples usually combines identity, purity, and impurity testing. Nuclear magnetic resonance spectroscopy and mass spectrometry can confirm molecular structure, while high-performance liquid chromatography estimates purity. Certificates of analysis from testing laboratories may list these results, but they do not establish safety or legality. In the absence of approved manufacturing, products sold online may contain the wrong compound, variable amounts, or unlisted contaminants. Independent verification is therefore central to analytical work and to interpreting any reported biological activity.
Laboratory detection of GW501516 commonly uses liquid chromatography coupled with tandem mass spectrometry. The method can identify the parent compound or its metabolites in urine and blood after sample cleanup. Protein precipitation, solid-phase extraction, or enzymatic hydrolysis may precede analysis, depending on the matrix. Reference standards are required for accurate quantification and confirmation. Because the compound is not approved, testing often occurs in anti-doping, forensic, or research settings rather than routine clinical care. Results are reported with limits of detection and quantification.
| Property | Value | Notes |
|---|---|---|
| Common synonyms | GW501516, GW-501516, GW 501516, endurobol | Names vary in research and anti-doping documents. |
| Chemical class | Synthetic PPARδ agonist | Small-molecule nuclear receptor ligand. |
| CAS Registry Number | 317318-70-0 | Identifier commonly associated with GW501516. |
| Appearance | White to off-white powder | Typical for purified research material. |
| Solubility | Low in water; soluble in DMSO and ethanol | Organic solvents are common for laboratory stock solutions. |
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.
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.
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.
PPARδ is a nuclear receptor that influences transcription of genes involved in fatty acid oxidation, lipid transport, and energy homeostasis. GW501516 binds and activates this receptor with high selectivity relative to PPARα and PPARγ in laboratory assays. Activation alters expression of target genes in skeletal muscle, liver, and adipose tissue in animal models. The exact clinical consequences of these changes in humans remain incompletely characterized, and observed effects in animals do not establish therapeutic benefit or safety.
Published studies have examined GW501516 in animal models of obesity, insulin resistance, and exercise endurance. Early human trials reportedly ended, and development was discontinued after preclinical findings raised concerns about cancer in some rodent studies. Regulatory agencies have not approved cardarine for any medical use. Its availability through non-pharmaceutical channels raises questions about identity, purity, and legal status that are separate from its laboratory pharmacology. Those questions are often addressed through analytical testing rather than assumptions about product labels.
Cardarine is a common name for GW501516, also GW-1516, a synthetic compound developed as a peroxisome proliferator-activated receptor delta (PPARδ) agonist. It belongs to a class of agents that modulate gene transcription related to lipid and energy metabolism. The compound was studied in preclinical and early clinical research for metabolic and cardiovascular conditions, but it did not progress to approved therapeutic use. Its name appears in fitness and sports contexts despite not being approved as a drug.
The three substrates of this enzyme are (R)-mevalonate, coenzyme A (CoA), and oxidised nicotinamide adenine dinucleotide phosphate (NADP+). Its products are (S)-3-hydroxy-3-methylglutaryl-CoA, reduced NADPH, and two protons. This enzyme belongs to the family of oxidoreductases, to be specific those acting on the CH-OH group of donor with NAD+ or NADP+ as acceptor. This enzyme participates in biosynthesis of steroids including cholesterol. The statin class of anticholesterol drugs act through inhibiting this enzyme.
It is 2.7 million times more radioactive than the same molar amount of natural uranium (mostly uranium-238), due to its proportionally shorter half-life. A sample of radium metal maintains itself at a higher temperature than its surroundings because of the radiation it emits. Natural radium (which is mostly 226Ra) emits mostly alpha particles, but other steps in its decay chain (the uranium or radium series) emit alpha or beta particles, and almost all particle emissions are accompanied by gamma rays. Experimental nuclear physics studies have shown that nuclei of several radium isotopes, such as 222Ra, 224Ra and 226Ra, have reflection-asymmetric ("pear-like") shapes. In particular, this experimental information on radium-224 has been obtained at ISOLDE using a technique called Coulomb excitation.
== Definition == Stimulant is an overarching term that covers many drugs including those that increase the activity of the central nervous system and the body, drugs that are pleasurable and invigorating, or drugs that have sympathomimetic effects. Sympathomimetic effects are those effects that mimic or copy the actions of the sympathetic nervous system. The sympathetic nervous system is a part of the nervous system that prepares the body for action, such as increasing the heart rate, blood pressure, and breathing rate. Stimulants can activate the same receptors as the natural chemicals released by the sympathetic nervous system (namely epinephrine and norepinephrine) and cause similar effects. Psychostimulant refers to a subset of substances within the stimulant drug class that act at the dopamine transporter (DAT), a protein that normally clears dopamine from the synaptic cleft. Amphetamine, methylphenidate, cocaine, and modafinil are examples of psychostimulants that promote arousal and affect task performance in a dose-dependent manner. Psychostimulants act at DAT by inhibiting dopamine reuptake or by initiating transporter-mediated dopamine efflux (i.e., reverse transport), thereby producing indirect dopamine agonist effects in the central nervous system. The DAT-mediated actions of psychostimulants contrast with other central nervous system stimulants that can overlap in behavioural effects, such as caffeine, a drug that promotes wakefulness primarily through antagonism of adenosine receptors.
== Function == SLC3A2 is a member of the solute carrier family and encodes a cell surface, transmembrane protein with an alpha-amylase domain. The protein exists as the heavy chain of a heterodimer, covalently bound through di-sulfide bonds to one of several possible light chains. It associates with integrins and mediates integrin-dependent signaling related to normal cell growth and tumorigenesis. Alternate transcriptional splice variants, encoding different isoforms, have been characterized. LAT1 is a heterodimeric membrane transport protein that preferentially transports neutral branched (valine, leucine, isoleucine) and aromatic (tryptophan, tyrosine, phenylalanine) amino acids. LAT is highly expressed in brain capillaries (which form the blood brain barrier) relative to other tissues. A functional LAT1 transporter is composed of two proteins encoded by two distinct genes:
Sources: en.wikipedia.org
== External links == This page was reproduced (with modifications) with expressed consent from Dr. A. Malcolm Campbell. As of 2010, the original page can be found at Campbell AM (2003). "Protein Crystallization". Davidson, NC: Department of Biology, Davidson College.
An antiscalant is a chemical or pre-treatment chemical that prevents the formation of scale, or crystallized mineral salts, commonly used in water purification systems, pipelines, and cooling tower applications. Antiscalants are also known as scale inhibitor agents. Scale formation occurs when the concentration of dissolved salts in water exceeds their solubility limits, leading to the precipitation of these salts onto surfaces as hard deposits. Antiscalants dissolve the substances accumulated near the membrane surface and reduce the rate of fouling. They play a crucial role in preventing scale formation, thus improving the efficiency and longevity of industrial equipment and processes.
=== Balon === Balon (Spanish "ball", after homologue Pelota) is a hibernation factor protein found in the cold-adapted bacterium Psychrobacter urativorans. The protein was discovered accidentally by a researcher who unintentionally left a sample of P. urativorans in an ice bucket for too long, cold-shocking it, through subsequent cryo-EM scans of the organism's ribosomes. Unlike other factors, Balon can bind to the ribosome while protein production is in process. This is important for rapid response to stress because in some cells, protein production can take up to 20 minutes to complete. Balon does this by rather than physically blocking the A site of the ribosome, as other hibernation factors do, binding near to but not across the channel, allowing it to attach to the ribosome independent of whether protein production is taking place. Genetic relatives of Balon have been found in 20% of bacterial genomes catalogued in public databases, but are absent from Escherichia coli and Staphylococcus aureus, the most widely used models for cellular dormancy.
=== Other areas === HDMI relies on the Vendor-Specific Block structure for features such as additional color spaces. DisplayPort uses the CEA EDID extensions. Both HDMI and DisplayPort have published specification for transmitting their signal over the USB-C connector (see USB-C § Alternate Mode partner specifications).
Bacterial cells are widely used for cloning processes, genetic modification and small-scale productions. Escherichia coli (E. Coli) is widely utilised due to its highly explored genetics, widely available genetic tools for gene expression, accurate profiling and its ability to grow in inexpensive media at high cell densities. E. Coli is mostly appropriate for structurally simple proteins owing to its inability to carry out post-translational modifications, lack of protein secretary system and the potential for producing inclusion bodies that require additional solubilisation. Regarding application, E.Coli is being utilised as the expression system of the dengue vaccine.
Sources: en.wikipedia.org
From this revolution, the 1950s also saw the advent of paper chromatography, reversed-phase partition chromatography (RPC), and hydrophobic interaction chromatography (HIC). The first gels for use in LC were created using cross-linked dextrans (Sephadex) in an attempt to realize Synge's prediction that a unique single-piece stationary phase could provide an ideal chromatographic solution. In the 1960s, polyacrylamide and agarose gels were created in a further attempt to create a single-piece stationary phase, but the purity of and stability of available components did not prove useful for implementation in the HPLC. In this decade, affinity chromatography was invented, an ultra-violet (UV) detector was used for the first time in conjunction with LC, and, most importantly, the modern HPLC was born. Csaba Horvath led the development of modern HPLC by piecing together laboratory equipment to suit his purposes. In 1968, Picker Nuclear Company marketed the first commercially available HPLC as a “Nucleic Acid Analyzer.” The following year, the first international symposia on HPLC was held, and Kirkland at DuPont was able to functionalize controlled porosity pellicular particles for the first time. The 1970s and 1980s witnessed a renewed interest in separations media with reduced interparticular void volumes. Perfusion chromatography showed, for the first time, that chromatography media could support high flow rates without sacrificing resolution. Monoliths aptly fit into this new class of media, as they exhibit no void volume and can withstand flow rates up to 9mL/minute.
There is evidence in a variety of species that the hormones oxytocin and vasopressin are involved in the bonding process, and in other forms of prosocial and reproductive behavior. Both chemicals facilitate pair bonding and maternal behavior in experiments on laboratory animals. In humans, there is evidence that oxytocin and vasopressin are released during labor and breastfeeding, and that these events are associated with maternal bonding. According to one model, social isolation leads to stress, which is associated with activity in the hypothalamic-pituitary-adrenal axis and the release of cortisol. Positive social interaction is associated with increased oxytocin. This leads to bonding, which is also associated with higher levels of oxytocin and vasopressin, and reduced stress and stress-related hormones. Oxytocin is associated with higher levels of trust in laboratory studies on humans. It has been called the "cuddle chemical" for its role in facilitating trust and attachment. In the reward centers of the limbic system, the neurotransmitter dopamine may interact with oxytocin and further increase the likelihood of bonding. One team of researchers has argued that oxytocin only plays a secondary role in affiliation, and that endogenous opiates play the central role. According to this model, affiliation is a function of the brain systems underlying reward and memory formation. Because the vast majority of this research has been done on animals—and the majority of that on rodents—these findings must be taken with caution when applied to humans.
The periodic table is a graphic description of the periodic law, which states that the properties and atomic structures of the chemical elements are a periodic function of their atomic number. Elements are placed in the periodic table according to their electron configurations, the periodic recurrences of which explain the trends in properties across the periodic table. An electron can be thought of as inhabiting an atomic orbital, which characterizes the probability it can be found in any particular region around the atom. Their energies are quantised, which is to say that they can only take discrete values. Furthermore, electrons obey the Pauli exclusion principle: different electrons must always be in different states. This allows classification of the possible states an electron can take in various energy levels known as shells, divided into individual subshells, which each contain one or more orbitals. Each orbital can contain up to two electrons: they are distinguished by a quantity known as spin, conventionally labelled "up" or "down". In a cold atom (one in its ground state), electrons arrange themselves in such a way that the total energy they have is minimized by occupying the lowest-energy orbitals available. Only the outermost electrons (valence electrons) have enough energy to break free of the nucleus and participate in chemical reactions with other atoms. The others are called core electrons.
"The terms mental health promotion and prevention have often been confused. Promotion is defined as intervening to optimize positive mental health by addressing determinants of positive mental health (i.e. protective factors) before a specific mental health problem has been identified, with the ultimate goal of improving the positive mental health of the population. Mental health prevention is defined as intervening to minimize mental health problems (i.e. risk factors) by addressing determinants of mental health problems before a specific mental health problem has been identified in the individual, group, or population of focus with the ultimate goal of reducing the number of future mental health problems in the population." In order to improve mental health, the root of the issue has to be resolved. "Prevention emphasizes the avoidance of risk factors; promotion aims to enhance an individual's ability to achieve a positive sense of self-esteem, mastery, well-being, and social inclusion." Mental health promotion attempts to increase protective factors and healthy behaviors that can help prevent the onset of a diagnosable mental disorder and reduce risk factors that can lead to the development of a mental disorder. Yoga is an example of an activity that calms one's entire body and nerves.
== Legacy == A Review of General Psychology survey, published in 2002, ranked Jung as the 23rd most cited psychologist of the 20th century. The list however focused on U.S. journals and was made by the psychology department of Arkansas State University. Although psychoanalysis is still studied in the humanities, a 2008 study in The Journal of the American Psychoanalytic Association found that psychology departments and textbooks treat it as "desiccated and dead". Similarly, Alan Stone noted, "As academic psychology becomes more 'scientific' and psychiatry more biological, psychoanalysis is being brushed aside."
Sources: en.wikipedia.org
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.
No. Cardarine is not a steroid hormone; it targets the nuclear receptor PPARδ. Its classification in anti-doping rules differs from anabolic steroids, though it remains prohibited in sport.
Early rodent studies reported tumor formation at multiple sites, which raised safety concerns. Sponsors stopped clinical development, and no approved human product exists.
LC-MS/MS is common, often after sample cleanup. The assay targets GW501516 or its metabolites.