Everything below concerns Nuclear receptor. We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Updated 2026-02-12. Numbers and descriptions here follow the published literature rather than marketing material.
At the molecular level, GW501516 binds and activates PPARδ, a nuclear receptor that regulates transcription. Activation shifts expression of genes involved in fatty acid oxidation, energy expenditure, and lipid transport in skeletal muscle and liver. Animal studies report increased endurance and altered lipid profiles after exposure. Human data are limited to small trials and do not establish long-term safety or efficacy. PPARδ also has roles in cell proliferation, so the relationship between activation and cancer risk remains an open question.
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.
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.
PPARδ is a nuclear receptor that regulates gene expression related to fatty acid oxidation, glucose homeostasis, and mitochondrial function. GW501516 binds to this receptor with high affinity and activates downstream signaling in skeletal muscle and other tissues. Animal studies reported increased endurance and altered fuel preference, but human data remain limited and inconsistent. The precise relationship between receptor activation and observed physiological changes is still an area of active investigation. Researchers have also examined whether the compound affects inflammation or cell proliferation. No approved therapeutic indication exists for cardarine.
| Property | Value | Notes |
|---|---|---|
| Common name | Cardarine | Also called GW501516 and endurobol. |
| Chemical formula | C21H18F3NO3S2 | Molecular weight about 453.5 g/mol. |
| Appearance | White to off-white solid | Form depends on synthesis and purity. |
| Solubility | Soluble in DMSO and ethanol | Low solubility in water. |
| Typical storage | -20 °C, desiccated, protected from light | Common for research chemicals. |
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.
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.
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.
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.
=== Protein modification === A classic way to crystalize is by adding a small amount of protease to the droplet, as digestion may yield a more crystallizable fragment by removing unstructured regions. Chemical modification can be used to improve crystallization. The most commonly used is reductive methylation, which changes surface lysines in a way that usually reduces entropy.
Calciseptine (CaS) is a natural neurotoxin isolated from the black mamba Dendroaspis p. polylepis venom. This toxin consists of 60 amino acids with four disulfide bonds. Calciseptine specifically blocks L-type calcium channels, but not other voltage-dependent Ca2+ channels such as N-type and T-type channels.
=== Utah === On March 13, 2024, Utah Governor Spencer Cox signed the Artificial Intelligence Policy Act (S.B 149). This legislation went into effect on May 1, 2024. It established liability, notably for companies that do not disclose their use of generative AI when required by state consumer protection laws, or when users commit criminal offense using generative AI. It also created the Office of Artificial Intelligence Policy and the Artificial Intelligence Learning Laboratory Program.
Sources: en.wikipedia.org
Wadden, Thomas A.; Chao, Ariana M.; Machineni, Sriram; Kushner, Robert; Ard, Jamy; Srivastava, Gitanjali; Halpern, Bruno; Zhang, Shuyu; Chen, Jiaxun; Bunck, Mathijs C.; Ahmad, Nadia N.; Forrester, Tammy (2023). "Tirzepatide after intensive lifestyle intervention in adults with overweight or obesity: The SURMOUNT-3 phase 3 trial". Nature Medicine. 29 (11): 2909–2918. doi:10.1038/s41591-023-02597-w. PMC 10667099. PMID 37840095. Wadden, Thomas A.; Chao, Ariana M.; Moore, Molly; Tronieri, Jena S.; Gilden, Adam; Amaro, Anastassia; Leonard, Sharon; Jakicic, John M. (2023). "The Role of Lifestyle Modification with Second-Generation Anti-obesity Medications: Comparisons, Questions, and Clinical Opportunities". Current Obesity Reports. 12 (4): 453–473. doi:10.1007/s13679-023-00534-z. PMC 10748770. PMID 38041774. Wadden, Thomas A.; Brown, Gregory K.; Egebjerg, Christina; Frenkel, Ofir; Goldman, Bryan; Kushner, Robert F.; McGowan, Barbara; Overvad, Maria; Fink-Jensen, Anders (2024). "Psychiatric Safety of Semaglutide for Weight Management in People Without Known Major Psychopathology". JAMA Internal Medicine. 184 (11): 1290–1300. doi:10.1001/jamainternmed.2024.4346. PMC 11372653. PMID 39226070.
== M == Magnetic resonance imaging (MRI) A non-invasive imaging technique that uses magnetic fields and radio waves to visualize detailed structures of the brain and other tissues. Malleus One of the three auditory ossicles in the middle ear. It transmits sound vibrations from the eardrum to the incus. Mammillary bodies Small round structures located in the hypothalamus involved in memory processing. Often damaged in Korsakoff syndrome. MAPK/ERK pathway A cellular signaling cascade involved in growth, differentiation, and survival. It plays roles in synaptic plasticity and neurodegeneration. Medial geniculate nucleus A relay center in the thalamus for auditory information, sending signals from the inner ear to the auditory cortex. Medial longitudinal fasciculus A bundle of nerve fibers in the brainstem involved in coordinating eye movements and head motion, especially during the vestibulo-ocular reflex. Medulla oblongata The lower part of the brainstem, responsible for autonomic functions such as respiration, heart rate, and blood pressure. Melatonin A hormone produced by the pineal gland that regulates circadian rhythms and the sleep–wake cycle. Secretion is influenced by light exposure. Memory The mental capacity to encode, store, and retrieve information. Subtypes include working memory, short-term memory, and long-term memory. Meninges The three protective membranes—dura mater, arachnoid mater, and pia mater—that surround the brain and spinal cord. Merkel cell A mechanoreceptor found in the skin involved in the sense of touch, particularly pressure and texture.
The states of Berlin, Bremen, and Hamburg are governed slightly differently from the other states. In each of those cities, the executive branch consists of a Senate of approximately eight, selected by the state's parliament; the senators carry out duties equivalent to those of the ministers in the larger states. The equivalent of the minister-president is the Senatspräsident (president of the senate), also commonly referred to as Bürgermeister (Mayor) in Bremen, the Erster Bürgermeister (first mayor) in Hamburg, and the Regierender Bürgermeister (governing mayor) in Berlin. The parliament for Berlin is called the Abgeordnetenhaus (House of Representatives), while Bremen and Hamburg both have a Bürgerschaft. The parliaments in the remaining 13 states are referred to as Landtag (State Parliament).
=== Differential Diagnosis === While Kwashiorkor is primarily characterized by edema, growth failure, and dermatitis, it can sometimes be misdiagnosed as Acrodermatitis Enteropathica (AE), as both conditions present with similar dermatological symptoms. However, AE is caused by zinc deficiency, not protein deficiency, and is associated with a significant decrease in serum zinc levels. Unlike kwashiorkor, which is diagnosed based on clinical signs like edema and low serum albumin levels, AE requires additional diagnostic tests, such as zinc uptake tests and genetic screening, to differentiate it from other disorders with similar symptoms. Therefore, while both conditions can present with dermatitis, the underlying etiology helps distinguish the two.
Sources: en.wikipedia.org
=== Lifespan === The lifespan of a starfish varies considerably among species. For example, Leptasterias hexactis reaches sexual maturity at 20 g (0.7 oz) in two years and lives for about ten years. Pisaster ochraceus matures at 70–90 g (2.5–3.2 oz) in five years and has a maximum recorded lifespan of 34 years.
The (1,2) and (3,4) bonds can also be formed from N-substituted α-aminoketones and formamide with heat. The product will be a 1,4-disubstituted imidazole, but here since R1 = R2 = hydrogen, imidazole itself is the product. The yield of this reaction is moderate, but it seems to be the most effective method of making the 1,4 substitution.
Carbohydrates, including interactive models and animations (Requires MDL Chime) IUPAC-IUBMB Joint Commission on Biochemical Nomenclature (JCBN): Carbohydrate Nomenclature Carbohydrates detailed Carbohydrates and Glycosylation – The Virtual Library of Biochemistry, Molecular Biology and Cell Biology Functional Glycomics Gateway, a collaboration between the Consortium for Functional Glycomics and Nature Publishing Group
=== Gene-first === The gene-first hypothesis proposes that the first living systems were self-replicating informational molecules, most likely RNA, capable of both storing genetic information and catalyzing chemical reactions. Under this model, simple self-replicating molecules would evolve under selective pressures into increasingly complex organisms. A key advantage of the gene-first hypothesis is that a single molecule capable of template-directed replication can evolve readily if modifications breed true, whereas metabolic networks are fundamentally resistant to evolutionary change. An autocatalytic network is a set of chemical reactions where the products of some reactions act as catalysts to accelerate other reactions in the same network. In simpler terms, chemicals in the network help each other form more chemicals, creating a self-sustaining and self-replicating system. A common challenge in metabolism-first origin-of-life theories is that chemical networks without genes tend to resist change. Imagine a system where one chemical (A) helps make a second chemical (B), and this second chemical (B) helps make more of the first (A). This creates a self-replicating loop but is hard to evolve because even if a better version of the first chemical (A') appears, the system only makes the original kind (B), not the improved one (B'). For this system to evolve, the better first (A`) chemical would also need to help make a better second chemical (B'), which then helps make more of the better first chemical (A'), a very unlikely chain.
{\displaystyle {\begin{aligned}r:\ &\rho \left({\partial _{t}u_{r}}+u_{r}{\partial _{r}u_{r}}+{\frac {u_{\varphi }}{r\sin \theta }}{\partial _{\varphi }u_{r}}+{\frac {u_{\theta }}{r}}{\partial _{\theta }u_{r}}-{\frac {u_{\varphi }^{2}+u_{\theta }^{2}}{r}}\right)\\&\quad =-{\partial _{r}p}\\&\qquad +\mu \left({\frac {1}{r^{2}}}\partial _{r}\left(r^{2}{\partial _{r}u_{r}}\right)+{\frac {1}{r^{2}\sin ^{2}\theta }}{\partial _{\varphi }^{2}u_{r}}+{\frac {1}{r^{2}\sin \theta }}\partial _{\theta }\left(\sin \theta {\partial _{\theta }u_{r}}\right)-2{\frac {u_{r}+{\partial _{\theta }u_{\theta }}+u_{\theta }\cot \theta }{r^{2}}}-{\frac {2}{r^{2}\sin \theta }}{\partial _{\varphi }u_{\varphi }}\right)\\&\qquad +{\frac {1}{3}}\mu \partial _{r}\left({\frac {1}{r^{2}}}\partial _{r}\left(r^{2}u_{r}\right)+{\frac {1}{r\sin \theta }}\partial _{\theta }\left(u_{\theta }\sin \theta \right)+{\frac {1}{r\sin \theta }}{\partial _{\varphi }u_{\varphi }}\right)\\&\qquad +\rho g_{r}\\[8px]\end{aligned}}}
Sources: en.wikipedia.org
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.
It activates PPARδ, a nuclear receptor that influences gene expression related to lipid and energy metabolism. Animal studies show changes in endurance and lipid levels. Human effects and risks are not well established.
No, cardarine is not a steroid. It belongs to a different chemical class, the PPARδ agonists. It is also not a selective androgen receptor modulator.
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.