fatty acid oxidation 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 2026-03-10. Numbers and descriptions here follow the published literature rather than marketing material.
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.
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.
Laboratory studies indicate that GW501516 activates PPARδ, a nuclear receptor involved in fatty acid oxidation and energy metabolism. In rodent experiments, treated animals often showed increased endurance and reduced fat mass. These effects were observed under controlled conditions and do not establish safe or effective use in humans. The exact dose-response relationship in humans remains poorly characterized. Species differences in metabolism can affect how results translate across animals and people.
| Property | Value | Notes |
|---|---|---|
| Chemical class | PPARδ agonist | Not an anabolic steroid. |
| Common synonyms | GW501516, GW-1516 | Cardarine is an informal name. |
| Appearance | White to off-white powder | Typical for research-grade solid. |
| Solubility class | Poorly soluble in water; soluble in some organic solvents | Such as DMSO or ethanol in laboratory settings. |
| Typical storage temperature | Cool, dry, protected from light | Specific conditions vary by supplier and form. |
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.
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.
This results in white woolly appearance and more pleasant aroma compared with tempeh made with commercial starter containing only Rhizopus oligosporus. Famously these variant tempeh are found in Malang and Purwokerto in the 1960s, because Malang is located in a cool plateau, and tempeh made with Rhizopus oligosporus resulted in less compact and more alcoholic-smelling tempeh, while Rhizopus arrhizus required lower optimum temperature which made it more ideal. However the widespread use of commercial starter resulted in most tempeh in Java only containing Rhizopus oligosporus, with few traditionally made tempeh outside Java still containing Rhizopus arrhizus and Rhizopus delemar.
The Basuto Gun War, also known as the Basutoland Rebellion, was a conflict between the Basuto and the British Cape Colony. It lasted from 13 September 1880 to 29 April 1881 and ended in a Basuto victory. Following Basutoland's transformation into a British dominion on 12 March 1868, it became the target of rapid westernization efforts by the Cape Colony administration. In 1879, the Cape Parliament extended the Peace Preservation Act to Basutoland, with the aim of disarming the Basuto people. The immense significance of guns in Basuto society, compounded with past grievances, resulted in a rebellion led by chiefs Lerotholi and Masopha, which erupted on 13 September 1880. Heavily outnumbered and stretched thin by the simultaneous outbreak of other revolts, the Cape Colonial Forces failed to achieve a decisive military victory. The ensuing military stalemate and the high cost of conducting the war in made it increasingly unpopular among Cape politicians. On 29 April 1881, High Commissioner for Southern Africa, Sir Hercules Robinson announced the peaceful settlement of the conflict. The Cape's subsequent efforts to enforce disarmament and re-establish the rule of law in Basutoland met with stiff resistance from Masopha and his supporters. Unable to control the Basuto, the Cape Parliament passed the Disannexation Act in September 1883. The Basuto Gun War represents a rare example of an African nation's military victory against a colonial power, whereby the Basuto were able to retain their guns.
=== Weather === Some evidence suggests sunnier climates do not predict happiness. In one study, both Californians and Midwesterners expected the former's happiness ratings to be higher due to a sunnier environment. In fact, the Californian and Midwestern happiness ratings did not show a significant difference. Other research has found that temperature, wind power, sunlight, precipitation and air temperature has a small impact on mood, but some people appear to be affected in a large way (but it's not 5 factor personality). A study of Dutch teenagers identified that the effect of weather on mood depends on whether they were Summer lovers, summer haters, rain haters and unaffected by weather. Other researchers say the necessary minimum daily dose of sunlight is as little as 30 minutes. That is not to say weather is never a factor for happiness. Perhaps the changing norms of sunlight cause seasonal affective disorder, which undermines level of happiness.
In April 2021, Bukele inaugurated a vaccination center at Hospital El Salvador to administer up to 10,000 doses of the COVID-19 vaccine per day; the center closed in August 2022, as dose administrations diminished. Most of El Salvador's COVID-19 vaccines were donated by the United States and China. On 13 May 2021, Bukele donated 34,000 doses of the COVID-19 vaccine to seven towns in Honduras after pleas from their mayors for vaccine doses. El Salvador had received 1.9 million doses at the time, and Honduras had only received 59,000. Gabriel Labrador, a journalist for El Faro, told El País that Bukele made the donation to Honduras to improve his public image in Central America.
Valve modified Alyx's AI to allow her to react to the player. Changes include commentating on objects the player manipulates or obstacles they have overcome. She also acts as an essential device in both plot exposition and directing the player's journey, often vocalizing what the player is required to do next to progress. Valve did not want Alyx to obstruct the player, and sometimes reduced her input and dialogue so players would not feel pressured or bothered by her presence. Valve placed what they described as "hero moments" to allow the player to single-handedly overcome obstacles such as challenging enemies, during which Alyx takes the role of an observer and gives the player praise. The game was extensively playtested so that Valve could gauge its effectiveness and difficulty. Episode One was made with an upgraded version of Source, with more advanced lighting effects and a new version of its facial animation/expression technology. Upgrades to enemy AI allow Combine soldiers to use tactics previously unavailable to them. For example, Combine soldiers were given the ability to crouch while being fired upon so they could duck underneath the player's line of fire. The soundtrack was composed by Kelly Bailey. The music is used sparingly; it plays primarily during scenes of major plot developments or particularly important action sequences, such as large battles or when encountering a new enemy.
Sources: en.wikipedia.org
where δ2HA is the delta value of pool A relative to VSMOW. As many delta values do not vary greatly from one another the α value is often very close to unity. A related measure called epsilon (ε) is often used which is given simply by:
=== NCBI identifiers === The NCBI defined a standard for the unique identifier used for the sequence (SeqID) in the header line. This allows a sequence that was obtained from a database to be labelled with a reference to its database record. The database identifier format is understood by the NCBI tools like makeblastdb and table2asn. The following list describes the NCBI FASTA defined format for sequence identifiers.
V is the volume of the gas, T is the temperature of the gas (measured in kelvins), and k is a constant for a particular pressure and amount of gas. This law describes how a gas expands as the temperature increases; conversely, a decrease in temperature will lead to a decrease in volume. For comparing the same substance under two different sets of conditions, the law can be written as:
== History == The structure of TRH was first determined, and the hormone synthesized, by Roger Guillemin and Andrew V. Schally in 1969. Both parties insisted their labs determined the sequence first: Schally first suggested the possibility in 1966, but abandoned it after Guillemin proposed TRH was not actually a peptide. Guillemin's chemist began concurring with these results in 1969, as NIH threatened to cut off funding for the project, leading both parties to return to work on synthesis. Schally and Guillemin shared the 1977 Nobel Prize in Medicine "for their discoveries concerning the peptide hormone production of the brain." News accounts of their work often focused on their "fierce competition" and use of a very large number of sheep and pig brains to locate the hormone.
Sources: en.wikipedia.org
=== Gel electrophoresis === Gel electrophoresis has been used in attempts to identify the amino acids present in the organic components of dinosaur eggshell. Contact with human skin can contaminate eggs with foreign amino acids, so only untouched eggs can be investigated using this technique. EDTA can be used to dissolve the calcite of the eggshell while leaving the shell's organic content intact. The resultant organic residue would be blended and then implanted into gel. Electricity would then be run through the sample, causing the amino acids to migrate through the gel until they stop at levels determined by their physical properties. Protein silver stain is then used to dye the amino acids and make them visible. The bands of amino acids from the dinosaur eggs can then be compared with the banding of samples with known composition for identification. Gel electrophoresis is not necessarily a perfect means of discovering the amino acid composition of dinosaur eggshell because sometimes the amount or type of amino acids present could be altered during or after preservation. One potential confounding factor would be the heating of deeply buried egg fossils, which can break down amino acids. Another potential source of error is groundwater, which can leach away amino acids. These issues cast doubt as to whether the results these sorts of studies give are reliable as the actual composition of the eggshell's organic material in life.
In Indonesia, the hardline anti-communist General Suharto wrested control from predecessor Sukarno in an attempt to establish a "New Order". From 1965 to 1966, with the aid of the US and other Western governments, the military led the mass killing of more than 500,000 members and sympathizers of the Indonesian Communist Party and other leftist organizations, and detained hundreds of thousands in prison camps under inhumane conditions. A top-secret CIA report stated that the massacres "rank as one of the worst mass murders of the 20th century, along with the Soviet purges of the 1930s, the Nazi mass murders during the Second World War, and the Maoist bloodbath of the early 1950s." These killings served US interests and constitute a major turning point in the Cold War as the balance of power shifted in Southeast Asia.
=== Tempe kering === Also known as kering tempe (lit: 'dry tempeh'), or sambal goreng tempe if mixed with plenty of hot and spicy sambal chili pepper sauce. It is a crispy, sweet and spicy, fried tempeh. The raw tempeh is cut into small sticks and thoroughly deep-fried until no longer moist, and then mixed with palm sugar, chili pepper or other spices, or with sweet soy sauce. Often it is mixed with separately fried peanuts and anchovies (ikan teri). This dry tempeh will keep for up to a month if cooked and stored properly.
Sources: en.wikipedia.org
Cardarine is commonly known as GW501516 or GW-1516. These names refer to the same synthetic compound. It is not a brand-name approved medicine.
No, cardarine is not a steroid. It is classified as a PPARδ agonist. Its structure and receptor target differ from anabolic steroids.
No regulatory agency has approved cardarine as a medicine. It was investigated in early research but development was discontinued. It is not available as a prescription drug.
Rodent studies reported increased endurance and fat oxidation after GW501516 exposure. Long-term studies also found higher rates of some tumors, which led to halted development.