Metabolite raises a handful of sensible questions. This page answers them in order, starting with the fundamentals and moving to applications.
Reviewed 2026-08-01. Anything still debated is marked as such rather than presented as settled.
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.
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.
Products sold as cardarine have been found to contain incorrect compounds, variable amounts, or no active ingredient at all. Independent testing is required to verify identity and purity. Common analytical approaches include high-performance liquid chromatography, mass spectrometry, and nuclear magnetic resonance for structural confirmation. These methods can distinguish GW501516 from related PPAR agonists and from unrelated steroids. For regulators and researchers, such verification is central to interpreting both biological results and adverse event reports.
| 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. |
Regulatory bodies treat GW501516 as a prohibited substance in competitive sport. The World Anti-Doping Agency added it to the prohibited list, and it falls under classes covering metabolic modulators and hormone-related agents. It is not approved by drug regulators for human use, and it is not a lawful dietary supplement. Products sold under the cardarine name may contain unlisted ingredients or different compounds. Because no approved product exists, quality and identity are not guaranteed by pharmaceutical manufacturing standards.
Cardarine is a common name for the investigational chemical GW501516, also written GW-1516. It was developed as a peroxisome proliferator-activated receptor delta agonist for metabolic conditions such as dyslipidemia. Early research focused on lipid handling and energy use in skeletal muscle and other tissues. The compound was never approved as a medicine. In public discussion, it is often grouped with performance-enhancing substances, although its receptor target differs from that of anabolic steroids or selective androgen receptor modulators. Regulatory and health authorities have issued warnings about its use.
Safety discussions about cardarine frequently cite rodent carcinogenicity findings reported in the 2000s. In those studies, treated animals developed tumors at multiple sites, leading sponsors to discontinue clinical development. The relevance of these findings to humans has not been resolved, but they are a major reason the compound is not approved. Current literature emphasizes uncertainty about long-term effects and the risks of unregulated use. Regulators and health agencies have not established a safe human exposure level.
Cardarine is a synthetic compound also known as GW501516, GW-501516, and sometimes endurobol. It was developed as a selective agonist of peroxisome proliferator-activated receptor delta, a nuclear receptor involved in fatty acid oxidation and energy metabolism. The compound was studied in preclinical models for metabolic and cardiovascular conditions, but it did not become a marketed human medicine. In regulatory and anti-doping contexts, it is treated as a prohibited substance rather than a licensed medicine.
Thomas also spent part of his summer holidays with Jim's sister, Rachel Jones, at neighbouring Pentrewyman farm, where he spent his time riding Prince the cart horse, chasing pheasants and fishing for trout. All these relatives were bilingual, and many worshipped at Smyrna chapel in Llangain where the services were always in Welsh, including Sunday School which Thomas sometimes attended. There is also an account of the young Thomas being taught how to swear in Welsh. His schoolboy friends recalled that "It was all Welsh—and the children played in Welsh...he couldn't speak English when he stopped at Fernhill...in all his surroundings, everybody else spoke Welsh..." At the 1921 census, 95% of residents in the two parishes around Fernhill were Welsh speakers. Across the whole peninsula, 13%—more than 200 people—spoke only Welsh. A few fields south of Fernhill lay Blaencwm, a pair of stone cottages to which his mother's Swansea siblings had retired, and with whom the young Thomas and his sister, Nancy, would sometimes stay. A couple of miles down the road from Blaencwm is the village of Llansteffan, where Thomas used to holiday at Rose Cottage with another Welsh-speaking aunt, Anne Williams, his mother's half-sister who had married into local gentry. Anne's daughter, Doris, married a dentist, Randy Fulleylove. The young Dylan also holidayed with them in Abergavenny, where Fulleylove had his practice. Thomas's paternal grandparents, Anne and Evan Thomas, lived at The Poplars in Johnstown, just outside Carmarthen. Anne was the daughter of William Lewis, a gardener in the town.
German is auxiliary, but a lack of Polish-speaking officials means German is still used in the judiciary until 1920. 25 May 1919: The Army of Great Poland is subjugated to the headquarters of the Polish Army but keeps its separate organisation. 30 May 1919: The People's Guard is transformed to the Home Defence (Obrona Krajowa). 1 June 1919: By-elections of MPs to Sejm Ustawodawczy. 6 June 1919 Skirmishes near Bydgoszcz (Bromberg). The rising threat of a German offensive induces the Commission of the NRL to introduce a state of emergency in all lands under its jurisdiction. In a belt of 20 km from the front line, it introduces martial law. A few days later, the NRL announces capital punishment for acting against the Great Polish Army or for the German army. 18 June 1919: Skirmishes near Rynarzewo. 28 June 1919: The Treaty of Versailles gives almost all of Greater Poland to Poland. 1 July 1919 The Commission of the NRL removes customs border with ex-Kingdom of Poland. Artillery fire at front. 9 July 1919: Farther than 20 km from the front, end of state of emergency. 10 July 1919: Proceedings of the Polish government with Commission of the NRL on further policy in the former Prussian Partition (Były Zabór Pruski). Creation of the Ministry of the Former Prussian Partition (Ministerstwo Byłej Dzielnicy Pruskiej).
3. Competitive inhibition: Some drugs may share the same P-450 specificity and thus competitively block their biotransformation. This may lead to accumulation of drugs metabolized by the enzyme. This type of drug interaction may also reduce the rate of generation of toxic metabolites.
== Habitat == Bacteria are ubiquitous, living in every possible habitat on the planet including soil, underwater, deep in Earth's crust and even such extreme environments as acidic hot springs and radioactive waste. There are thought to be approximately 2×1030 bacteria on Earth, forming a biomass that is only exceeded by plants. They are abundant in lakes and oceans, in arctic ice, and geothermal springs where they provide the nutrients needed to sustain life by converting dissolved compounds, such as hydrogen sulphide and methane, to energy. They live on and in plants and animals. Most do not cause diseases, are beneficial to their environments, and are essential for life. The soil is a rich source of bacteria and a few grams contain around a thousand million of them. They are all essential to soil ecology, breaking down toxic waste and recycling nutrients. They are even found in the atmosphere and one cubic metre of air holds around one hundred million bacterial cells. The oceans and seas harbour around 3 × 1026 bacteria which provide up to 50% of the oxygen humans breathe. Only around 2% of bacterial species have been fully studied.
Sources: en.wikipedia.org
== Fabrication of porous silicon == Anodization and stain-etching are the two most common methods used for fabrication of porous silicon; however, there are almost twenty other methods to fabricate this material. Drying and surface modification might be needed afterwards. If anodization in an aqueous solution is used to form microporous silicon, the material is commonly treated in ethanol immediately after fabrication, to avoid damage to the structure that results due to the stresses of the capillary effect of the aqueous solution.
The inactivation of the enzymes that stop the reaction and activating of enzymes that provide a positive feedback will increase glycogen, lipid & protein syntheses and promote glucose intake. (Image to help explain the function of the proteins mentioned above in the positive feedback.)
== Biosynthesis == A novel aspect of PQQ is its biosynthesis in bacteria from a ribosomally translated precursor peptide, PqqA. A glutamic acid and a tyrosine in PqqA are cross-linked by the radical SAM enzyme PqqE with the help of PqqD in the first step of PqqA modification. A protease then liberates the Glu-Tyr molecule from the peptide backbone. PqqB oxidizes the 2 and 3 positions on the tyrosine ring, forming a quinone which quickly becomes AHQQ, finishing the pyridine ring. PqqC then forms the final pyrrole ring.
On 14 August 1926, Oscar Tiegs married Ethel Mary Hamilton, a telephonist, at the Presbyterian Church in the Melbourne suburb of Hawthorn. Tiegs was known to form lasting friendships, even from relatively brief associations. For example, colleagues he met only once while on a trip to Europe in 1928, had fond memories of him. He was known as Sandy Tiegs to his friends and colleagues. He was godfather to David, the son of his mentor and colleague, Professor Brailsford Robertson. Tiegs was always interested in learning and research, and was known to find administration and committee work distasteful. This would appear to be at odds with his being a Councillor, and Chair of the Library Committee, for The Royal Society of Victoria. As head of the Melbourne University's Department of Zoology, he encouraged research and empowered his staff to set their own courses of activity with a directed freedom that nurtured world class research. He tended not to be interested in the research of others unless it was closely aligned with his own, yet was proud of his staff and was keen to show visitors what his staff were doing. He lectured without notes, mainly to first year students, to whom he gave a solid background in elementary zoology and comparative morphology, in a manner which was considered a model of presentation and clarity. He gave special lectures on arthropod evolution and the vertebrate nervous system to senior students.
=== Particular studies === In a Bulgarian study, after five years, 34% had developed into a defined connective tissue disease (with the highest probability of development being within the first two years after onset of symptoms), 54% continued undifferentiated, and 12% were in remission. In a US study, after 10 years, 37% had developed into a defined connective tissue disease, 43% continued undifferentiated, and 20% were in remission. In a Spanish study, after a mean follow-up of 11±3 years, 14% had developed a definite CTD, 62% continued undifferentiated, and 24% were in remission. In an Italian study (in which 58% had ANA abnormalities), after five years, 6% had developed a defined autoimmune disease. The remaining 94% saw clinical and serological features little changed in the period and quite stable. 11% of these were and remained asymptomatic.
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.
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.