A practical reference on PPAR delta: what it is, how it behaves, what the literature reports, and where the honest uncertainties sit.
This page was last updated on 2026-08-01 and is reviewed periodically as new material appears.
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.
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.
| Property | Value | Notes |
|---|---|---|
| Appearance | White to off-white powder | Visual description for typical solid reference material. |
| Solubility | Poorly soluble in water; soluble in DMSO | Solubility depends on solvent, purity, and form. |
| Storage | Cool, dry, protected from light | Long-term storage often uses low temperature and desiccant. |
| Common analytical method | LC-MS/MS | Used for detection and quantification in biological matrices. |
| Common synonyms | GW-501516; GW501516; endurobol | Naming varies among literature, vendors, and databases. |
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.
Anti-doping laboratories identify GW501516 and its metabolites using liquid chromatography-tandem mass spectrometry. Urine is the usual matrix, and detection can occur after the parent compound has cleared from blood. The exact detection window depends on dose, formulation, individual metabolism, and assay sensitivity. Because the compound is prohibited at all times, athletes are subject to testing in and out of competition. Analytical methods continue to improve as new metabolites and designer analogs are characterized.
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.
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.
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.
=== Properties === In terms of molecular structure, synephrine has a phenethylamine skeleton, with a phenolic hydroxy- group, an alcoholic hydroxy- group, and an N-methylated amino-group. Alternatively, synephrine might be described as a phenylethanolamine with an N-methyl and p-hydroxy substituent. The amino-group confers basic properties on the molecule, whereas the phenolic –OH group is weakly acidic: the apparent (see original article for discussion) pKas for protonated synephrine are 9.55 (phenolic H) and 9.79 (ammonium H). Common salts of racemic synephrine are its hydrochloride, C9H13NO2.HCl, m.p. 150–152°, the oxalate (C9H13NO2)2.C2H2O4, m.p. 221–222 °C, and the tartrate (Sympatol), (C9H13NO2)2.C4H6O6, m.p. 188–190 °C. The presence of the hydroxy-group on the benzylic C of the synephrine molecule creates a chiral center, so the compound exists in the form of two enantiomers, d- and l- synephrine, or as the racemic mixture, d,l- synephrine. The dextrorotatory d-isomer corresponds to the (S)-configuration, and the levorotatory l-isomer to the (R)-configuration. Racemic synephrine has been resolved using ammonium 3-bromo-camphor-8-sulfonate. The enantiomers were not characterized as their free bases, but converted to the hydrochloride salts, with the following properties: (S)-(+)-C9H13NO2.HCl: m.p. 178 °C; [α] = +42.0°, c 0.1 (H2O); (R)-(−)-C9H13NO2.HCl: m.p. 176 °C; [α] = −39.0°, c 0.2 (H2O) (−)-Synephrine, as the free base isolated from a Citrus source, has m.p. 162–164 °C (with decomposition). The X-ray structure for synephrine has been determined.
=== Cosmetic uses === Tranexamic acid can be used in skincare products as a cosmetic active to reduce the appearance of inflammation and hyperpigmentation. Tranexamic acid is a zwitterion amino acid, and has a low permeability coefficient in the stratum corneum. Tranexamic acid can be combined with penetration enhancers and microneedling to overcome this limitation. Cosmetic uses may also employ lipophilic derivatives of tranexamic acid (ester prodrugs like Cetyl tranexamate mesylate) that are not zwitterionic and thus have improved skin permeability.
Conformations are the same in solution and when adsorbed. Diastereomers bind to surfaces (silica gel in normal phase chromatography) mainly with hydrogen bonding. Significant resolution of diastereomers is only expected when molecules can adsorb to silica through two contact points (two hydrogen bonds). This interaction can be perturbed by substituents. Diastereomers with bulky substituents on the alpha carbon (R2) and on the nitrogen (R1) can shield the hydrogen bonding with the surface, thus the molecule will be eluted before similar molecules with smaller substituents. Helmchen's postulates have been proven to be applicable to other functional groups such as: carbamates, esters, and epoxides.
== Personal life == Paul J. Kaesberg was born in Engers district in Germany, on September 26, 1923. In 1926, his parents Gertrude and Peter Kaesberg, moved to the United States of America, and chose to settle in the city of West Bend, Wisconsin. He married Marian L. Kaesberg on June 13, 1953, and the couple had three children.
In populations with a low risk for type 2 diabetes, in lean subjects and women with auto-antibodies, there is a higher rate of women developing type 1 diabetes (LADA). Children of women with GDM have an increased risk for childhood and adult obesity and an increased risk of glucose intolerance and type 2 diabetes later in life. This risk relates to increased maternal glucose values. It is currently unclear how much genetic susceptibility and environmental factors contribute to this risk, and whether treatment of GDM can influence this outcome. The relative benefits and harms of different oral anti-diabetic medications are not yet well understood as of 2017. There are scarce statistical data on the risk of other conditions in women with GDM; in the Jerusalem Perinatal study, 410 out of 37,962 women were reported to have GDM, and there was a tendency towards more breast and pancreatic cancer, but more research is needed to confirm this finding. Research is being conducted to develop a web-based clinical decision support system for GDM prediction using machine learning techniques. Results so far demonstrated great potential in clinical practicality for automatic GDM prognosis.
Sources: en.wikipedia.org
The CCT then causes actin's sequential folding by forming bonds with its subunits rather than simply enclosing it in its cavity. This is why it possesses specific recognition areas in its apical β-domain. The first stage in the folding consists of the recognition of residues 245–249. Next, other determinants establish contact. Both actin and tubulin bind to CCT in open conformations in the absence of ATP. In actin's case, two subunits are bound during each conformational change, whereas for tubulin binding takes place with four subunits. Actin has specific binding sequences, which interact with the δ and β-CCT subunits or with δ-CCT and ε-CCT. After AMP-PNP is bound to CCT the substrates move within the chaperonin's cavity. It also seems that in the case of actin, the CAP protein is required as a possible cofactor in actin's final folding states. The exact manner by which this process is regulated is still not fully understood, but it is known that the protein PhLP3 (a protein similar to phosducin) inhibits its activity through the formation of a tertiary complex.
== Chemistry == Unlike the hormones with which it competes, flutamide is not a steroid; rather, it is a substituted anilide. Hence, it is described as nonsteroidal in order to distinguish it from older steroidal antiandrogens such as cyproterone acetate and megestrol acetate.
His strong performance forced the down-ballot races for lieutenant governor and secretary of state to be decided by the state legislature when its vote total prevented either the Republican or Democratic candidate for those offices from garnering a majority of votes. But the campaign drained the Liberty Union's finances and energy, and in October 1977, Sanders and the Liberty Union candidate for attorney general, Nancy Kaufman, announced their retirement from the party. During the 1980 presidential election, Sanders was one of three electors for the Socialist Workers Party in Vermont. After resigning from the Liberty Union Party in 1977, Sanders worked as a writer and as the director of the nonprofit American People's Historical Society (APHS). While with the APHS, he produced a 30-minute documentary about American labor leader Eugene V. Debs, who ran for president five times as the Socialist Party candidate. On October 25, 2025, the Eugene V. Debs Foundation gave Sanders its namesake award, first given to John L. Lewis in 1965.
1. "Unichem, Optimus enter into strategic tie-up”. The Hindu Business Line.com. Published on 5 November 2018. 2. “Unichem to acquire 20% stake in Optimus group for Rs 120 cr”. Business-standard.com. Published on 5 November 2018. 3. “Unichem Labs gets USFDA nod for asthma drug”. Economictimes.com. Published on 4-July-2018. 4. “Unichem Labs' Ghaziabad unit gets EIR from USFDA” Thebusinessline.com. Published on 5 June 2018. 2018. 5. “Unichem Laboratories Gets ANDA Approval from U.S. FDA for Valsartan Tablets, USP.” Reuters.com. Published on 7 May 2018. 6. “How Torrent Pharma is integrating Unichem to boost its domestic business.” Business-standard.com. Published on 13 February 2018. 7. “Torrent Pharma completes acquisition of Unichem Laboratories Ltd.” Economictimes.com. Published on 14 December 2017. 8. “This conventional businessman is set for second innings”. Economictimes.indiatimes.com. Published on 4 November 2017. 9. “Unichem Labs gets EIR from USFDA for Goa facility” Economics times.com. Published on 30 June 2017. 10. "Unichem Lab appoints Mr. Bhagwat S. Dhingra as Chief Executive-Domestic Pharma". Moneycontrol.com. 13 August 2012. 11. "Contact Pharmaceutical Company India - Unichem Laboratories". Unichemlabs.com. Retrieved 3 October 2010. 12. "Interview of Dr P A Mody, CEO, Unichem Laboratories Ltd". Indiainfoline.com. Retrieved 3 October 2010. 13. "BSE Plus". Bseindia.com. Retrieved 3 October 2010. 14. "Pharmaceutical Business, Pharma Business Development - Unichem Laboratories". Unichemlabs.com. Retrieved 3 October 2010. 15.
Sources: en.wikipedia.org
With the university requiring the VCA to introduce its Melbourne Model course structure, necessitating a reduction in the amount of hands-on arts training that students receive, critics feared that future students might be unable to find employment upon graduation. Staff of the former VCA accused the dean, Sharman Pretty, of having "little or no recognition of the need for focused arts training, or any esteem for the arts themselves", and the University of Melbourne of trying to mislead the public about the effects. Students were also fearful a reduction in the quality of education and programs on offer whilst the school remained under the University of Melbourne.
== In popular culture == In the video game Terra Invicta, the aliens attacking the Earth come to be nicknamed "hydras" due to their similarity to the real-world animal. They share a number of common traits, such as tentacles around their mouth, tissue regeneration, and lacking senescence.
In molecular biology, Proteinase K (EC 3.4.21.64, protease K, endopeptidase K, Tritirachium alkaline proteinase, Tritirachium album serine proteinase, Tritirachium album proteinase K) is a broad-spectrum serine protease. The enzyme was discovered in 1974 in extracts of the fungus Parengyodontium album (formerly Engyodontium album or Tritirachium album). Proteinase K is able to digest hair (keratin), hence, the name "Proteinase K". The predominant site of cleavage is the peptide bond adjacent to the carboxyl group of aliphatic and aromatic amino acids with blocked alpha amino groups. It is commonly used for its broad specificity. This enzyme belongs to Peptidase family S8 (subtilisin). The molecular weight of Proteinase K is 28,900 daltons (28.9 kDa).
Major subranges of the Eastern Front include the Black Mountains, Great Craggy Mountains, and Great Balsam Mountains, and its chief summits include Grandfather Mountain 5,964 ft (1,818 m) near the Tennessee-North Carolina border, Mount Mitchell 6,684 ft (2,037 m) in the Blacks, and Black Balsam Knob 6,214 ft (1,894 m) and Cold Mountain 6,030 ft (1,840 m) in the Great Balsams. The Western Blue Ridge Front is subdivided into the Unaka Range, the Bald Mountains, the Great Smoky Mountains, and the Unicoi Mountains, and its major peaks include Roan Mountain 6,285 ft (1,916 m) in the Unakas, Big Bald 5,516 ft (1,681 m) and Max Patch 4,616 ft (1,407 m) in the Bald Mountains, Kuwohi 6,643 ft (2,025 m), Mount Le Conte 6,593 feet (2,010 m), and Mount Guyot 6,621 ft (2,018 m) in the Great Smokies, and Big Frog Mountain 4,224 ft (1,287 m) near the Tennessee-Georgia-North Carolina border. Prominent summits in the cross ridges include Waterrock Knob (6,292 ft (1,918 m)) in the Plott Balsams. Across northern Georgia, numerous peaks exceed 4,000 ft (1,200 m), including Brasstown Bald, the state's highest, at 4,784-and-4,696 ft (1,458-and-1,431 m) Rabun Bald. In north-central Alabama, Mount Cheaha rises prominently to 1,445 feet (440 m) over its surroundings, as part of the southernmost spur of the Blue Ridge Mountains.
=== Amélie of Leuchtenberg === Amélie of Leuchtenberg (1812–1873) was Empress of Brazil as the wife of Emperor Pedro I (also King Pedro IV of Portugal). Between February and September 2012, researchers from the University of São Paulo exhumed her remains, along with those of Pedro I and his first wife, Maria Leopoldina. The investigation revealed that Amélie's body had been mummified, with her skin, hair, and internal organs preserved. Forensic examinations at the Hospital das Clínicas identified an incision in the jugular vein, used to inject aromatic substances such as camphor and myrrh during the original embalming. According to forensic archaeologist Valdirene Ambiel, the preservation was aided by the casket's hermetic seal, which prevented the growth of microorganisms. Before reinterment, the body was re-embalmed using methods similar to the original 19th-century process. The remains of Amélie, Pedro I, and Maria Leopoldina are interred within the crypt of the Monument to the Independence of Brazil in São Paulo.
Sources: en.wikipedia.org
Cardarine targets PPARδ, a nuclear receptor involved in lipid and energy metabolism. It does not bind the androgen receptor in the way SARMs do.
Most methods use liquid chromatography with tandem mass spectrometry. Urine is common in anti-doping testing, and blood or plasma may be used in research.
Typical guidance is cool, dry, dark storage, often at low temperature and with desiccant. Stability data are limited, so storage conditions should be verified for each batch or supplier.
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.