Everything below concerns PPARδ. We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Updated 2026-08-01. Numbers and descriptions here follow the published literature rather than marketing material.
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.
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.
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.
| Property | Value | Notes |
|---|---|---|
| CAS Registry Number | 317318-70-0 | Unique identifier for the compound. |
| Chemical class | PPARδ agonist | Synthetic ligand for peroxisome proliferator-activated receptor delta. |
| Appearance | White to off-white solid | Typical form of research-grade material. |
| Solubility | Soluble in DMSO and ethanol | Poorly soluble in water. |
| Typical storage | -20°C | Recommended for long-term storage of stock solutions. |
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.
GW501516 acts as a selective agonist at PPARδ, a nuclear receptor that regulates transcription of genes involved in lipid handling and energy metabolism. Activation of PPARδ in preclinical models increases fatty acid oxidation, mitochondrial biogenesis, and exercise endurance in rodents. These effects have made the compound a subject of metabolic research and also a target for sport anti-doping rules. In humans, however, controlled studies are limited, and whether similar endurance or metabolic changes occur at tolerated exposures remains an open question. The receptor’s broad tissue distribution also means downstream effects may vary by organ and condition.
Sporting authorities added GW501516 to prohibited lists after it appeared in athlete samples and online markets. The World Anti-Doping Agency classifies it as a hormone and metabolic modulator, and its use can lead to an anti-doping rule violation. Some early laboratory work suggested effects on fatty acid oxidation and endurance-related metabolism in animals, but those findings do not establish safe or effective use in people. Reports of adverse events in humans are scarce and often anecdotal, which complicates risk assessment.
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.
GW501516 acts as a ligand for PPAR delta, a nuclear receptor that regulates transcription of genes involved in fatty acid oxidation and energy use. Activation of this receptor in skeletal muscle shifts metabolism toward fat burning in animal models. The compound does not burn fat directly; it changes gene expression over hours to days. Researchers study it to understand metabolic flexibility and exercise adaptation. Effects observed in rodents are not automatically expected in humans.
Preclinical research reported that GW501516 increased running endurance in mice and improved lipid profiles in some animal species. Early human trials explored effects on high-density lipoprotein cholesterol, triglycerides, and glucose handling, but the program was discontinued. Published human data are sparse and do not establish efficacy for any condition. Studies also examined PPAR delta in cancer biology, with conflicting findings across models. The relationship between receptor activation, tissue context, and disease risk remains an active area of investigation.
=== February === 1 February Mike Behrens, lawyer and judge, King's Counsel (since 1999), District Court judge (2004–2011) (born 1941). Dame Iritana Tāwhiwhirangi, Māori language advocate (born 1929). 2 February – Peter Babich, Hall of Fame viticulturist and businessman (born 1932). 5 February – Brian Turner, field hockey player (national team), poet and environmental campaigner, Commonwealth Poetry Prize (1999), Poet Laureate (2003–2005) (born 1944). 6 February – Jim Cole, volcanologist (University of Canterbury), Fellow of the Royal Society of New Zealand (since 2004) (born 1941). 7 February – Ian Barton, forester, heritage advocate (Queen's Redoubt Trust), and local-body politician, Franklin District Councillor (1998–2004) (born 1937). 10 February Lynne Giddings, nursing and women's studies academic (Auckland University of Technology, University of Auckland) (born 1945). Toni Huata, Māori musician (born 1969). Rod McElrea, racing driver, national beach racing champion (1971), OSCA champion (1983) (born 1941). 12 February – Theo Janssen, sculptor, stained-glass artist and painter (born 1934). 13 February – Joe Pope, business executive (Petrocorp, ENZA) and rugby administrator, chair of Hurricanes franchise (1999–2003) and Wellington Rugby Football Union (2003–2009) (born 1941). 15 February David Ellison, Māori leader (Kāti Huirapa), veterans' welfare and children's health advocate (born 1936). David Parsons, musician, composer and ethnomusicologist (born 1944). 17 February – David Saunders, lawyer and judge, District Court judge (1993–2020) (born c. 1951).
=== Graphene === Layering graphene on top of gold has been shown to improve SPR sensor performance. Its high electrical conductivity increases the sensitivity of detection. The large surface area of graphene also facilitates the immobilization of biomolecules while its low refractive index minimizes its interference. Enhancing SPR sensitivity by incorporating graphene with other materials expands the potential of SPR sensors, making them practical in a broader range of applications. For instance, the enhanced sensitivity of graphene can be used in conjunction with a silver SPR sensor, providing a cost-effective alternative for measuring glucose levels in urine. Graphene has also been shown to improve the resistance of SPR sensors to high-temperature annealing up to 500 °C.
Critic Robert Christgau called it "an ominous, obsessive, tongue-in-cheek country-rock synthesis, absorbing rural and urban, traditional and contemporary, at point of impact." Parsons suffered from fear of flying and the band toured via train. The band members lost most of their money in a perpetual poker game and their concerts were met with bewilderment. Parsons was taking psilocybin and cocaine, so his performances were erratic. The most successful appearance was in Philadelphia, where the group opened for the reconstituted Byrds. Midway through their set, Parsons joined the headline act and fronted his former group on renditions of "Hickory Wind" and "You Don't Miss Your Water". After returning to Los Angeles, the group recorded "The Train Song", written during an increasingly infrequent songwriting session on the train and produced by 1950s R&B legends Larry Williams and Johnny "Guitar" Watson. Despite a request from the Burritos that the remnants of their publicity budget be diverted to the promotion of the single, it also flopped. During this period, Ethridge departed, saying that he did not share Parsons' and Hillman's affinity for country music. He was replaced by lead guitarist Bernie Leadon, while Hillman reverted to bass. By this time, Parsons's drug use had increased to the point where new songs were rare, and much of his time was spent partying with the Rolling Stones, who were in America finishing Let It Bleed. As the Stones prepared to play the nation's largest venues, the Burritos played to dwindling nightclub audiences.
It is now generally acknowledged that by itself, the low protein theory does not adequately account for the pathogenesis of kwashiorkor. More complex deficiencies are at work. These have still not been established. Social factors are also relevant and ignorance of nutrition can be a cause. A case was described where parents who fed their child cassava failed to recognize malnutrition because of the edema caused by the syndrome and thought the child was well-nourished despite the development of kwashiorkor.
Sources: en.wikipedia.org
Antithrombin is a serpin (serine protease inhibitor) and is thus similar in structure to most other plasma protease inhibitors, such as alpha 1-antichymotrypsin, alpha 2-antiplasmin and Heparin cofactor II. The physiological target proteases of antithrombin are those of the contact activation pathway (formerly known as the intrinsic pathway), namely the activated forms of Factor X (Xa), Factor IX (IXa), Factor XI (XIa), Factor XII (XIIa) and, to a greater extent, Factor II (thrombin) (IIa), and also the activated form of Factor VII (VIIa) from the tissue factor pathway (formerly known as the extrinsic pathway). The inhibitor also inactivates kallikrein and plasmin , also involved in blood coagulation. However it inactivates certain other serine proteases that are not involved in coagulation such as trypsin and the C1s subunit of the enzyme C1 involved in the classical complement pathway. Protease inactivation results as a consequence of trapping the protease in an equimolar complex with antithrombin in which the active site of the protease enzyme is inaccessible to its usual substrate. The formation of an antithrombin-protease complex involves an interaction between the protease and a specific reactive peptide bond within antithrombin. In human antithrombin this bond is between arginine (arg) 393 and serine (ser) 394 (see Figure 2 and Figure 3). It is thought that protease enzymes become trapped in inactive antithrombin-protease complexes as a consequence of their attack on the reactive bond.
The Western blot is extensively used in biochemistry for the qualitative detection of single proteins and protein-modifications (such as post-translational modifications). At least 8–9% of all protein-related publications are estimated to apply Western blots. It is used as a general method to identify the presence of a specific single protein within a complex mixture of proteins. A semi-quantitative estimation of a protein can be derived from the size and colour intensity of a protein band on the blot membrane. In addition, applying a dilution series of a purified protein of known concentrations can be used to allow a more precise estimate of protein concentration. The Western blot is routinely used for verification of protein production after molecular cloning. Western blots are also used in medical diagnostics, e.g., in the HIV test and BSE-test. The confirmatory HIV test formerly employed a Western blot to detect anti-HIV antibody in a human serum sample. Proteins from known HIV-infected cells are separated and blotted on a membrane as above. Then, the serum to be tested is applied in the primary antibody incubation step; free antibody is washed away, and a secondary anti-human antibody linked to an enzyme signal is added. The stained bands then indicate the proteins to which the patient's serum contains antibody. A Western blot is also used as the definitive test for variant Creutzfeldt–Jakob disease, a type of prion disease linked to the consumption of contaminated beef from cattle with bovine spongiform encephalopathy (BSE, commonly referred to as 'mad cow disease').
It is used to determine insulin dose adjustments, determine lowest and highest blood glucose levels, discover insulin duration and, in the case of continued hyperglycemia, whether the cause is insufficient insulin dose or Somogyi rebound, where blood glucose levels initially reach hypoglycemic levels and are brought to hyperglycemic ones by the body's counterregulatory hormones. Curves also provide evidence of insulin resistance which may be caused by medications other than insulin or by disorders other than diabetes which further testing can help identify. Other diagnostic tests to determine the level of diabetic control are fructosamine and glycated hemoglobin (GHb) blood tests which can be useful especially if stress may be a factor. While anxiety or stress may influence the results of blood or urine glucose tests, both of these tests measure glycated proteins, which are not affected by them. Fructosamine testing provides information about blood glucose control for an approximate 2- to 4-week period, while GHb tests measure a 2- to 4-month period. Each of these tests has its own limitations and drawbacks and neither are intended to be replacements for blood glucose testing and curves, but are to be used to supplement the information gained from them. While HbA1c tests are a common diagnostic for diabetes in humans, only recently has an A1C test become available for cats and dogs. The product is called A1CARE and is available from Baycom Diagnostics.
== Radiation-induced hair loss == Radiation induces hair loss through damage to hair follicle stem cell progenitors and alteration of keratin expression. Radiation therapy has been associated with increased mucin production in hair follicles. Studies have suggested electromagnetic radiation as a therapeutic growth stimulant in alopecia.
== Sunderland's classification == In 1951, Sunderland expanded Seddon's classification to five degrees. The first two are the same as Seddon's. With each degree, the severity of the injury increases and has larger structural disruption and poorer prognosis. Sunderland's third-degree and fourth-degree are included within Seddon's axonotmensis. Sunderland's third-degree is nerve fiber interruption. This includes an endoneurium lesion with disruption of the axon and endoneurium, but an intact epineurium and perineurium. Recovery from a third-degree injury may require surgical intervention due to misdirected regeneration that is caused by endoneurial damage. In fourth-degree injury, only the epineurium remain intact, and a complete block to axonal regeneration could occur, requiring surgical repair. Sunderland's fifth-degree is included within Seddon's neurotmesis. Fifth-degree lesion is a complete transection of the nerve, including the epineurium. Recovery requires appropriate surgical treatment since there is no spontaneous recovery expected.
Sources: en.wikipedia.org
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.
No. Cardarine is not an anabolic steroid; it belongs to a different chemical class that targets PPARδ. Steroids act primarily through androgen receptors, while cardarine acts through a nuclear receptor involved in metabolism.
Some rodent studies reported increased endurance and changes in fat metabolism after cardarine exposure. Long-term studies in animals also raised concerns about cancer in certain tissues. Human trial data are limited, so these findings cannot be directly translated to people.
Anti-doping and clinical laboratories commonly use liquid chromatography-tandem mass spectrometry. The method can identify GW501516 and its metabolites in urine or blood. Detection depends on sample timing and the amount present.