A practical reference on Preclinical research: what it is, how it behaves, what the literature reports, and where the honest uncertainties sit.
Reviewed 2025-10-30. Anything still debated is marked as such rather than presented as settled.
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.
Laboratory detection of cardarine typically involves sample preparation followed by chromatographic separation and mass spectrometric identification. Urine is the most common matrix for anti-doping tests, though blood and hair have also been explored. Methods can target the parent compound or its metabolites, depending on the expected window of detection. Reference standards are required for accurate quantification. Matrix effects and dilution can influence results, so laboratories use internal standards and validation protocols. The exact detection window varies with dose, route, and individual metabolism.
Cardarine is prohibited in competitive sport under the World Anti-Doping Agency code, where it is classified as a metabolic modulator. It is not approved as a prescription medicine in the United States, European Union, or other major markets. Regulatory action has focused on its presence in sports and in products marketed as research chemicals. Because it has no accepted medical indication, supply is often unregulated. This status creates legal and safety uncertainties for anyone who encounters the substance.
Anti-doping laboratories detect GW501516 and its metabolites using liquid chromatography-tandem mass spectrometry. Urine is the most common matrix, though blood and dried blood spots may also be used in some programs. Detection depends on factors such as dose, timing, metabolism, and the sensitivity of the assay. Published methods describe limits of detection in the low nanogram per milliliter range for related compounds. Exact detection windows are not fixed for all situations and remain an area of ongoing study.
| Property | Value | Notes |
|---|---|---|
| Regulatory status | Prohibited in sport | Listed by WADA as a PPARδ agonist. |
| Typical detection matrix | Urine | Most common sample for anti-doping analysis. |
| Common analytical method | LC-MS/MS | Liquid chromatography-tandem mass spectrometry. |
| Common synonyms | GW501516, GSK-516, endurobol | Names found in research and fitness contexts. |
| Typical detection window | Variable | Depends on dose, route, and individual metabolism. |
Safety concerns emerged from long-term animal studies. In rodents given the compound for extended periods, researchers found an increased incidence of certain cancers, including liver and bladder tumors. These findings contributed to the discontinuation of clinical development. Whether similar risks apply to short-term or low-level exposure in humans is not established, and controlled human safety data are limited. The relevance of high-dose rodent carcinogenicity findings to human use remains a subject of debate.
Human trials of GW501516 were small and short in duration. They examined lipid levels, glucose handling, and other metabolic markers, but the programs were halted after the animal cancer findings. No approved therapeutic product exists, and published human data are insufficient for establishing long-term safety. Reports of use for athletic performance come mainly from non-clinical settings and cannot be verified through controlled trials. Independent testing of products sold as cardarine has found inconsistent purity and labeling.
In laboratory settings, cardarine is studied as a tool compound for probing PPARδ biology. Published experiments often use cell cultures, rodent models, or isolated tissues. Some investigations focus on metabolic effects, while others assess potential risks such as carcinogenicity observed in long-term animal studies. Because human trials are sparse, most knowledge comes from preclinical work and adverse event reports. Scientific literature frequently notes the gap between animal findings and human outcomes. The compound is not a dietary supplement and is not intended for human consumption.
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.
28 April: Education Minister Erica Stanford announces that the New Zealand Government will invest $53 million in covering teachers' registration and practising certificate fees over the next three years. The Ministry for Primary Industries lifts biosecurity restrictions at a Mainland Poultry farm in Otago where the H7N6 avian influenza strain was detected in late 2024. 29 April: Mayor of Wellington Tory Whanau confirms she will not contest the 2025 Wellington mayoral election and endorses Andrew Little. Fonterra confirms it will close its Hamilton canning and packing facility in July 2025, affecting 120 jobs. 30 April: New Zealand–Philippines relations: Defence Minister Judith Collins signs a visiting forces agreement with her Philippine counterpart, Gilbert Teodoro, in Manila. Education Minister Erica Stanford and Finance Minister Nicola Willis confirm that the NZ Government will introduce financial literacy into the primary school curriculum from 2027. Justice Minister Paul Goldsmith announces that the NZ Government will reinstate a blanket ban on prisoners voting.
=== Marriage === He married Jane Winifred "Jennie" Stirling (1881–1966), the third daughter of his former professor, Sir Edward Stirling, at Mount Lofty, South Australia on 1 July 1910. They had three children: Judith Stirling Robertson (1917–2012), later, Mrs. Herbert Charles Vaughan Woollard, the physicist and amateur radio operator, David Stirling Robertson, B.Sc., M.Sc., Ph.D., D.Sc. (1920–1999), and the medical practitioner, Thorburn Stirling Brailsford Robertson, M.B. B.S. (1925–1966), known as "Stirling".
Robin Harper, a former leader of the Scottish Greens, joins Scottish Labour, citing his former party's failure on the environment for his decision. 12 June – MSPs vote for the early release of 500 prisoners in order to ease overcrowding in the Scottish Prison Service. Edinburgh City Council approves plans by AEG to build an 8,500 capacity stadium at Edinburgh Park. 13 June – Stagecoach Group announces plaans to cut services in north Scotland as it launches a review of its operations. 14 June – Five Scotland fans are taken to hospital after their hire car crashed as they left an airport in Germany driving on the wrong side of the road. The Independent Parliamentary Standards Authority clears Douglas Ross of misusing his travel expenses following an investigation. The 2024 Birthday Honours are published. Among Scots to be recognised are former Prime Minister Gordon Brown, who becomes a Companion of Honour, and footballers Graeme Souness (CBE) and Ally McCoist (MBE). 16 June – Aberdeen City Council cancels the 2024 Highland Games shortly before it is due to commence following "heavier than forecast" rain. 17 June – NHS Dumfries and Galloway warns residents living in the area to assume some of their data has been published online after its database was hacked. 18 June – Scottish Labour launches its general election manifesto. 19 June – The Scottish National Party launches its election manifesto, with plans to "end Westminster cuts" and increase investment in the NHS.
Sources: en.wikipedia.org
Recombinant human parathyroid hormone is an artificially manufactured form of the parathyroid hormone used to help treat hypoparathyroidism (under-active parathyroid glands) and osteoporosis. Recombinant human parathyroid hormone (Preotact) received market authorization in the European Union in April 2006 to treat osteoporosis in postmenopausal women at high risk of fractures. Preotact marketing authorisation was later voluntarily withdrawn in 2014 by the holder NPS Pharma. FDA approval (as Preos) was not granted in the US for the same indication due to hypercalcemia and injection device issues. Recombinant human parathyroid hormone (Natpara) was approved for medical use in the United States in January 2015, and received (as Natpar) conditional market authorization in the European Union in February 2017 as orphan drug. On 2019 Natpara was recalled in the US due to rubber particle issues emerging from daily use of the cartridge. Takeda announced in 2022 its decision to stop manufacturing Natpara/Natpar globally at the end of 2024.
It is a hard technique, which tends to break down large molecule ions during flight, since large molecules are particularly easy to fragment. Furthermore, large molecules are hard to volatilize without being degraded by heat.
=== Food Safety Management Systems (FSMS) === A Food Safety Management System (FSMS) is "a systematic approach to controlling food safety hazards within a business in order to ensure that the food product is safe to consume." In some countries FSMS is a legal requirement, which obliges all food production businesses to use and maintain a FSMS based on the principles of Hazard Analysis Critical Control Point (HACCP). HACCP is a management system that addresses food safety through the analysis and control of biological, chemical, and physical hazards in all stages of the food supply chain. The ISO 22000 standard specifies the requirements for FSMS.
An injector pen consists of a chamber or cartridge of medication, a tip to attach a needle, and a piston or plunger to inject the dose. Some pens, including most insulin pens, include dials to adjust the dose of the injection before each administration. Dials enable more accurate dose measuring than traditional vial and syringe administration, especially for low doses of insulin. Injector pens which have dials to adjust dosages may also include a clicking sound or other method to confirm the dose adjustment. Some pens may include a cartridge filled with medication which can be replaced when empty to enable reuse of the pen itself, whereas other pens are designed to be disposed of after their prefilled chamber is depleted. Injector pens designed for single use may also be autoinjectors, which do not require the user to press a plunger to inject the dose.
Sources: en.wikipedia.org
== Towards Seismic Cloaking == Computations showed that seismic waves traveling toward a building, could be directed around the building, leaving the building unscathed, by using seismic metamaterials. The very long wavelengths of earthquake waves would be shortened as they interact with the metamaterials; the waves would pass around the building so as to arrive in phase as the earthquake wave proceeded, as if the building was not there. The mathematical models produce the regular pattern provided by metamaterial cloaking. This method was first understood with electromagnetic cloaking metamaterials—the electromagnetic energy is in effect directed around an object, or hole, and protecting buildings from seismic waves employs this same principle. Giant polymer-made split-ring resonators combined with other metamaterials are designed to couple at the seismic wavelength. Concentric layers of this material would be stacked, each layer separated by an elastic medium. The design that worked is ten layers of six different materials, which can be easily deployed in building foundations. As of 2009, the project is still in the design stage. In 2019, scientists identified flaws in models of seismic cloaks related to extrapolations from photonics, and proved that a perfect cloak, which bends out-of-plane waves completely away from a structure, is not feasible (though they can be dampened), but a cloak which protects against surface waves and dampens others is still possible.
=== Blood reservoir === Because the liver is an expandable organ, large quantities of blood can be stored in its blood vessels. Its normal blood volume, including both that in the hepatic veins and that in the hepatic sinuses, is about 450 milliliters, or almost 10 percent of the body's total blood volume. When high pressure in the right atrium causes backpressure in the liver, the liver expands, and 0.5 to 1 liter of extra blood is occasionally stored in the hepatic veins and sinuses. This occurs especially in cardiac failure with peripheral congestion. Thus, in effect, the liver is a large, expandable, venous organ capable of acting as a valuable blood reservoir in times of excess blood volume and capable of supplying extra blood in times of diminished blood volume.
=== Salvage pathway === Constitutive degradation of sphingolipids and glycosphingolipids takes place in the acidic subcellular compartments, the late endosomes and the lysosomes, with the end goal of producing sphingosine. In the case of glycosphingolipids, exohydrolases acting at acidic pH optima cause the stepwise release of monosaccharide units from the end of the oligosaccharide chains, leaving just the sphingosine portion of the molecule, which may then contribute to the generation of ceramides. Ceramide can be further hydrolyzed by acid ceramidase to form sphingosine and a free fatty acid, both of which are able to leave the lysosome, unlike ceramide. The long-chain sphingoid bases released from the lysosome may then re-enter pathways for synthesis of ceramide and/or sphingosine-1-phosphate. The salvage pathway re-utilizes long-chain sphingoid bases to form ceramide through the action of ceramide synthase. Thus, ceramide synthase family members probably trap free sphingosine released from the lysosome at the surface of the endoplasmic reticulum or in endoplasmic reticulum-associated membranes. The salvage pathway has been estimated to contribute from 50% to 90% of sphingolipid biosynthesis.
== Pharmacology == Corticosteroids act as agonists of the glucocorticoid receptor and/or the mineralocorticoid receptor. In addition to their corticosteroid activity, some corticosteroids may have some progestogenic activity and may produce sex-related side effects.
== Toxicity == Several typical mechanisms underlying graphene (oxide) nanomaterial's toxicity have been revealed, for instance, physical destruction, oxidative stress, DNA damage, inflammatory response, apoptosis, autophagy, and necrosis. In these mechanisms, toll-like receptors (TLR), transforming growth factor-beta (TGF-β) and tumor necrosis factor-alpha (TNF-α) dependent-pathways are involved in the signalling pathway network, and oxidative stress plays a crucial role in these pathways. Many experiments have shown that graphene (oxide) nanomaterials have toxic side effects in many biological applications, but more in-depth study of toxicity mechanisms is needed. According to the USA FDA, graphene, graphene oxide, and reduced graphene oxide elicit toxic effects both in vitro and in vivo. Graphene-family nanomaterials (GFN) are not approved by the USA FDA for human consumption.
Sources: en.wikipedia.org
Yes, WADA prohibits cardarine as a PPARδ agonist. It appears on the prohibited list and can be detected in urine or blood. Athletes using it risk sanctions.
Detection usually uses liquid chromatography-tandem mass spectrometry after sample cleanup. Laboratories look for the parent compound or metabolites. The method requires validated reference standards and controls.
Legality varies by country. In many places it is an unapproved drug and cannot be legally sold for human consumption. Purchasing from online vendors carries legal and quality risks.
Legal status varies by country, but cardarine is not approved as a medicine in major jurisdictions. It is often sold as a research chemical, a category that may not be lawful for human use. Buyers should check local laws and product labels carefully.