unapproved substance 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 2026-06-10. Numbers and descriptions here follow the published literature rather than marketing material.
Legal status varies by country. In some places, cardarine is controlled under medicines or psychoactive substances laws; in others, it may be sold with minimal oversight as a research chemical. Customs agencies have intercepted shipments, and several national health agencies have issued warnings about products marketed for bodybuilding or performance enhancement. The lack of a standardized pharmaceutical supply means identity, purity, and contamination levels can differ widely between samples. These factors make cardarine a regulatory and public health concern rather than a conventional prescription drug.
Cardarine is a common name for GW501516, a synthetic compound first described in the 1990s as a selective agonist of the peroxisome proliferator-activated receptor delta. It was studied in preclinical models for metabolic and cardiovascular conditions, but it has not been approved as a medicine in the United States, Europe, or other major jurisdictions. Retail products labeled as cardarine are generally research chemicals or supplements, not pharmaceutical formulations. Because human safety and efficacy data remain limited, regulatory agencies treat it as an unapproved substance rather than a therapeutic product.
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.
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.
| Property | Value | Notes |
|---|---|---|
| IUPAC name | {4-[({4-methyl-2-[4-(trifluoromethyl)phenyl]-1,3-thiazol-5-yl}methyl)sulfanyl]phenoxy}acetic acid | Systematic name for GW501516 |
| CAS Registry Number | 317318-70-0 | Unique identifier for the parent compound |
| Molecular formula | C21H18F3NO3S2 | Includes carbon, hydrogen, fluorine, nitrogen, oxygen, and sulfur |
| Molecular weight | 453.5 g/mol | Approximate value for the neutral form |
| Appearance | White to off-white powder | Typical description for purified laboratory material |
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.
A common misconception is that cardarine has been proven safe for human use. In reality, human clinical data are limited, and long-term animal studies have raised concerns about cancer. Another misconception is that it is a supplement or vitamin-like compound. It is a synthetic research chemical with no approved medical indication. Scientific discussion often focuses on its mechanism and detection rather than therapeutic use. Regulatory and anti-doping literature treats it primarily as a prohibited substance.
Cardarine is explicitly prohibited by the World Anti-Doping Agency under the class of PPARδ agonists. Its presence in urine or blood samples can be detected using mass spectrometry-based methods, often liquid chromatography-tandem mass spectrometry. Athletes who test positive may face sanctions, including bans from competition. The compound is also regulated as a prescription-only or unapproved drug in many countries. Enforcement varies by jurisdiction, and some regions treat it as a controlled substance. Online sales may occur despite these restrictions, creating quality and legal risks.
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.
==== 3000–3099 ==== Motor Vehicles (Tests) (Amendment) Regulations 1993 (S.I. 1993/3011) Public Service Vehicles (Conditions of Fitness, Equipment, Use and Certification) (Amendment) Regulations 1993 (S.I. 1993/3012) Goods Vehicles (Plating and Testing) (Amendment) (No. 2) Regulations 1993 (S.I. 1993/3013) Community Customs Code (Consequential Amendment of References) Regulations 1993 (S.I. 1993/3014) Statistics of Trade (Customs and Excise) (Amendment No. 2) Regulations 1993 (S.I. 1993/3015) Retirement Benefits Schemes (Restriction on Discretion to Approve) (Additional Voluntary Contributions) Regulations 1993 (S.I. 1993/3016) Advice and Assistance (Scotland) (Prospective Cost) Revocation Regulations 1993 (S.I. 1993/3017) Inverclyde Royal National Health Service Trust (Establishment) Order 1993 (S.I. 1993/3018) Kirkcaldy Acute Hospitals National Health Service Trust (Establishment) Order 1993 (S.I. 1993/3019) Queen Margaret Hospital National Health Service Trust (Establishment) Order 1993 (S.I. 1993/3020) Stobhill National Health Service Trust (Establishment) Order 1993 (S.I. 1993/3021) Angus National Health Service Trust (Establishment) Order 1993 (S.I. 1993/3022) Glasgow Royal Infirmary University National Health Service Trust (Establishment) Order 1993 (S.I. 1993/3023) Renfrewshire Healthcare National Health Service Trust (Establishment) Order 1993 (S.I. 1993/3024) West Glasgow Hospitals University National Health Service Trust (Establishment) Order 1993 (S.I. 1993/3025) Highland Communities National Health Service Trust (Establishment) Order 1993 (S.I.
==== Pancreatic cancer ==== First-in-human application of different αvβ6-integrin radiotracers has demonstrated that 68Ga-Trivehexin performed especially well in detecting pancreatic cancer, showing high uptake in tumor lesions and low background in the gastrointestinal tract (GI tract) (see image). Since its introduction, 68Ga-Trivehexin has been used predominantly for PET/CT imaging of pancreatic ductal adenocarcinoma (PDAC), for example, in single cases and two cohorts (12 and 44 patients, respectively) of suspected or known PDAC.
The normal function of Aβ is not yet known. Though some animal studies have shown that the absence of Aβ does not lead to any obvious loss of physiological function, several potential activities have been discovered for Aβ, including activation of kinase enzymes, protection against oxidative stress, regulation of cholesterol transport, functioning as a transcription factor, and anti-microbial activity (potentially associated with Aβ's pro-inflammatory activity). The glymphatic system clears metabolic waste from the mammalian brain, and in particular amyloid beta. A number of proteases have been implicated by both genetic and biochemical studies as being responsible for the recognition and degradation of amyloid beta; these include insulin degrading enzyme and presequence protease. The rate of removal is significantly increased during sleep. However, the significance of the glymphatic system in Aβ clearance in Alzheimer's disease is unknown.
== External links == Parathyroid+Hormone+Receptors at the U.S. National Library of Medicine Medical Subject Headings (MeSH) "Parathyroid Hormone Receptors". IUPHAR Database of Receptors and Ion Channels. International Union of Basic and Clinical Pharmacology.
=== Prenatal and newborn screening === Checking for hemoglobinopathies begins during pregnancy, with a prenatal screening questionnaire which includes, among other things, a consideration of health issues in the child's parents and close relatives. During pregnancy, genetic testing can be done on samples taken of fetal blood, of amniotic fluid, or chorionic villus sampling. A routine heel prick test, in which a small sample of blood is collected a few days after birth, can detect some forms of hemoglobinopathy.
Sources: en.wikipedia.org
== Clinical significance == MT-TD mutations have been associated with complex IV deficiency of the mitochondrial respiratory chain, also known as cytochrome c oxidase deficiency. Cytochrome c oxidase deficiency is a rare genetic condition that can affect multiple body parts, including skeletal muscles, the heart, the brain, or the liver. Common clinical manifestations include myopathy, hypotonia, and encephalomyopathy, lactic acidosis, and hypertrophic cardiomyopathy. A patient with a 7526A>G mutation in the MT-TD gene exhibited gradually worsening symptoms of exercise intolerance, increased creatine kinase levels, sustained exercise leading to muscle pains and general malaise. A patient with a 7543A>G mutation also exhibited symptoms of the disease.
Article 7 allows member states to be suspended for a "clear risk of a serious breach" of values in article 2 (for example, democracy, equality, human rights) with a four-fifths vote of the Council of the European Union, and the consent of the Parliament. Within the treaties' framework, sub-groups of member states may make further rules that only apply to those member states who want them. For example, the Schengen Agreements of 1985 and 1990 allow people to move without any passport or ID checks anywhere in the EU, but did not apply to the UK or Ireland. During the European debt crisis, the Treaty Establishing the European Stability Mechanism 2012 and the Treaty on Stability, Co-ordination and Governance 2012 (the "Fiscal Compact") were adopted only for member states who had the Euro (i.e. not Denmark, Sweden, the UK, Poland, Czech Republic, Hungary, Romania or Bulgaria). This required, among other things, a pledge to balance the government budget and limit structural deficits to 0.5 per cent of GDP, with fines for non-compliance. The jurisdiction for these rules remains with the Court of Justice.
In addition, the numerous secondary symptoms resulting from renal dysfunction, such as disorders of the water, electrolyte and acid-base balance, increased blood pressure, anemia and digestive disorders are treated with medication. If detected and treated early, the progression of the disease can be slowed, the quality of life improved and the life expectancy of the animals increased.
Leu-enkephalin is an endogenous opioid peptide neurotransmitter with the amino acid sequence Tyr-Gly-Gly-Phe-Leu that is found naturally in the brains of many animals, including humans. It is one of the two forms of enkephalin; the other is met-enkephalin. The tyrosine residue at position 1 is thought to be analogous to the 3-hydroxyl group on morphine. Leu-enkephalin has agonistic actions at both the μ- and δ-opioid receptors, with significantly greater preference for the latter. It has little to no effect on the κ-opioid receptor. A nasal spray formulation of leu-enkephalin (developmental code names NES-100, NM-0127, NM-127, PES-200; proposed brand name Envelta) is under development by Virpax Pharmaceuticals for the treatment of pain and post-traumatic stress disorder (PTSD). As of November 2023, it is up to the preclinical stage of development for these indications.
Sources: en.wikipedia.org
German-made Leopard tanks from Warsaw arrived in Ukraine as Polish Prime Minister Mateusz Morawiecki visited Kyiv to send a "clear and measurable signal of further support". The United States authorized $2 billion in aid to Ukraine, and ramped up sanctions and tariffs on Russia. The weapons package announced by the Defense Department included funding for contracts for HIMARS rockets, drones and counter-drone equipment, mine-clearing devices, 155-millimeter artillery ammunition and secure lines of communication. China proposed a peace plan which involves a ceasefire and multiple other steps that would result in direct negotiations. China holds the stance about "countries' sovereignty, independence and territorial integrity be effectively guaranteed" and that the "cold war mentality" should end. US officials such as President Biden and Secretary of State Antony Blinken expressed doubts about the plan, citing doubts over its neutrality and its failure to condemn the invasion. Zelenskyy stated that it was good that China is talking about Ukraine, but that he would cautiously await details on the plan. It was also speculated by some experts that depending on how this turns out, China could also turn around and start supplying Russia with military equipment.
== Awards and honors == 2014 – Silver Medal for "erma-Promp: Socks for xerosis treatment in diabetic feet, 42nd International Exhibition of Inventions of Geneva 2018 – Leader of Innovation prize, 11th International Invention and Innovation Show INTARG 2019 – Leadership Award (Grand Officer), British High Commission 2019 – Outstanding Professional Women Award, Federation of Business and Professional Women of Thailand 2021 – Gold Medal for "Sericin and chitosan cream for preventing and limiting the progressive of pressure sore", International Invention & Trade Expo 2024 – National Outstanding Researcher Award, NRCT
The organizers had overbooked the venue, leaving hundreds of fans locked outside. When Gillespie and Hart attempted to break the locks, the police were called. Support band Meat Whiplash had stirred up violence before the Mary Chain set foot onto the stage when singer Paul McDermott threw an empty wine bottle into the audience, prompting four members of the crowd to attack him, leading to their set being abandoned. Second act The Jasmine Minks got through their set without incident, but The Jesus and Mary Chain then kept the audience waiting for over an hour before taking the stage, and then left the stage after playing for less than twenty minutes. Members of the audience began throwing cans at where the band were hiding behind the stage curtains, before mounting the stage to smash the equipment that remained there. The violence continued for some time before police eventually took control. The venue blamed the band's late appearance and two equipment breakdowns, while McGee issued a statement saying that "the audience were not smashing up the hall, they were smashing up pop music", going on to say "This is truly art as terrorism". The violence soon started to become a hindrance to the band, with people attending concerts simply for the violence rather than the music, William commenting "I hate it, I despise it. It gets in the way in terms of getting more gigs, and it gets in the way of our image". Many performances were cancelled during the remainder of 1985, with promoters or local councils not prepared to risk a riot.
Unpressed bittern-gelled soft tofu is called sun-dubu (순두부; "mild tofu") in Korean. Soy milk is mixed with seawater, or saline water made with sea salt, so that it curdles. The curds remain loose and soft. Freshly made sun-dubu is eaten boiled with little or no seasoning. Manufactured sundubu is usually sold in tubes. It is also the main ingredient in sundubu-jjigae (순두부찌개; "soft tofu stew"). Although the word sun in sun-dubu does not have a Sino-Korean origin, sun-dubu is often translated into Chinese and Japanese using the Chinese character 純, whose Korean pronunciation is sun and the meaning is "pure". Thus in China, sun-dubu is called chún dòufu (純豆腐; "pure tofu"), and in Japan, it is called jun-tōfu (純豆腐) or sundubu (スンドゥブ).
is the number of theoretical plates (also called the "plate count"), H is the total bed height and HETP is the height equivalent to a theoretical plate. The material in packed beds can either be random dumped packing (1-3" wide) such as Raschig rings or structured sheet metal. Liquids tend to wet the surface of the packing and the vapors contact the wetted surface, where mass transfer occurs.
Sources: en.wikipedia.org
No. Major drug regulators have not approved GW501516 for treating any medical condition. Products sold as cardarine are typically unapproved research chemicals or supplements, so their contents and safety are not assured.
It is prohibited by the World Anti-Doping Agency as a hormone and metabolic modulator. Athletes who test positive for GW501516 can face sanctions, including suspensions and loss of results.
Cardarine is a common or trade-style name, while GW501516 is the research code for the same chemical entity. Some sources also use Endurobol or GSK-516. The names refer to the same compound, not distinct drugs.
LC-MS/MS is common, often after sample cleanup. The assay targets GW501516 or its metabolites.