carcinogenicity raises a handful of sensible questions. This page answers them in order, starting with the fundamentals and moving to applications.
This page was last updated on 2025-10-13 and is reviewed periodically as new material appears.
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.
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.
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.
The pharmacological interest in cardarine centers on PPARδ activation and its downstream effects on lipid handling and mitochondrial function. In animal studies, PPARδ agonists have been associated with changes in exercise endurance and fatty acid utilization, though results vary by model and protocol. Human data remain sparse, and the absence of large controlled trials limits conclusions about efficacy. Researchers often describe the compound as a tool for probing PPARδ biology rather than a proven therapeutic agent.
| Property | Value | Notes |
|---|---|---|
| Primary target | PPARδ (NR1C2) | Nuclear receptor involved in lipid metabolism |
| Preclinical effect | Increased fatty acid oxidation | Observed in rodent studies |
| Key safety signal | Tumors in rodents after long-term exposure | Contributed to halted clinical development |
| Human trial status | No approved product; development stopped | Limited short-term metabolic data |
| Sport regulatory status | Prohibited at all times | WADA hormone and metabolic modulators class |
Early clinical research explored GW501516 for lipid disorders, obesity, and diabetes. Some short-term human studies reported changes in HDL cholesterol, LDL cholesterol, and triglycerides. The development program was discontinued after rodent studies showed dose-dependent tumor formation in multiple tissues, including liver, bladder, stomach, and skin. These findings raised concerns about long-term cancer risk in humans. Because human exposure data are limited, the clinical significance of the rodent tumors remains uncertain.
Literature on cardarine often separates receptor pharmacology from toxicology. Mechanistic papers describe PPARδ activation and gene expression changes, while safety assessments focus on carcinogenicity and species differences. Questions remain about whether rodent tumors arise through PPARδ-dependent or off-target mechanisms. Another open area is how human metabolism and exposure compare with those in animal studies. Analytical methods such as liquid chromatography–mass spectrometry are used to confirm identity in biological and product samples.
GW501516 acts as an agonist at the peroxisome proliferator-activated receptor delta, a nuclear receptor that regulates gene expression. Activation shifts transcription toward genes involved in fatty acid uptake, oxidation, and energy expenditure. The compound does not bind the androgen receptor and therefore differs from anabolic steroids and SARMs. In rodent models, this metabolic shift has been linked to increased running endurance and reduced fat accumulation. The exact downstream pathways in humans remain incompletely characterized.
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.
Detection of GW501516 in biological samples generally relies on liquid chromatography coupled with tandem mass spectrometry. Urine is a common matrix in anti-doping analysis, while blood or plasma may be used in research settings. Sample preparation can involve enzymatic hydrolysis, protein precipitation, or solid-phase extraction before instrumental analysis. Because the compound undergoes metabolism, assays may target the parent molecule, one or more metabolites, or both. Detection windows are not fixed; they depend on factors such as dose, route, individual metabolism, and assay sensitivity. Reference standards are required for accurate identification and quantification.
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.
=== Hydrogen isotope formation === 1H, with one proton and no neutrons, is the most abundant nuclide in the Solar System, formed in the earliest rounds of stellar explosions after the Big Bang. After the universe exploded into life, the hot and dense cloud of particles began to cool, first forming subatomic particles like quarks and electrons, which then condensed to form protons and neutrons. Elements larger than hydrogen and helium were produced with successive stars, forming from the energy released during supernovae. Deuterium, 2H, with one proton and one neutron, is also known to have cosmic origin. Like protium, deuterium was produced very early in the universe's history, during Big Bang nucleosynthesis (BBN). As protons and neutrons combined, helium-4 was produced with a deuterium intermediate. Alpha reactions with 4He produce many of the larger elements that dominate today's Solar System. However, before the universe cooled, high-energy photons destroyed any deuterium, preventing larger element formation. This is called the deuterium bottleneck, a restriction on the timeline for nucleosynthesis. All of today's deuterium originated from this proton-proton fusion after enough cooling. Tritium, 3H, with one proton and two neutrons, was produced by proton and neutron collisions in the early universe as well, but it has since radioactively decayed to helium-3. Today's tritium cannot be from BBN, due to tritium's short half-life, 12.3 years. Today's 3H concentration is instead governed by nuclear reactions and cosmic rays.
While roughly 400 public buildings in Ontario contain RAAC, the Science Centre is currently the only one in the province closed due to these concerns. The Ford government expedited its plan to relocate the Science Centre to the waterfront, targeting a 2028 opening, with a temporary location slated for January 2026. This drew further criticism, including from Moriyama Teshima Architects, the firm founded by the Science Centre's original architect. The architects offered to do pro bono design consulting services for the Government of Ontario to support immediate repairs to the roof, and called for other organizations to join the effort to facilitate repairs. Private donors, including Geoffrey Hinton, offered up to $1 million to fund repairs for the existing facility, but the province did not respond to these offers. By October 31, 2024, most of the exhibits had been moved to storage facilities in northern Toronto and Guelph, while the animals and plants had been transferred to the Toronto Zoo and The Village at Black Creek. Temporary pop-up exhibits have since opened at Sherway Gardens and Toronto's Harbourfront Centre.
== History == Vacutainer technology was developed in 1947 by Joseph Kleiner, and is currently marketed by Becton Dickinson (B-D). The Vacutainer was preceded by other vacuum-based phlebotomy technology such as the Keidel vacuum. The plastic tube version, known as Vacutainer PLUS, was developed at B-D in the early 1990s by E. Vogler, D. Montgomery and G. Harper amongst others of the Surface Science Group as US patents 5344611, 5326535, 5320812, 5257633 and 5246666. Vacutainers are widely used in phlebotomy in developed countries due to safety and ease of use. Vacutainers have the advantage of being prepared with additives, allowing easy multi-tube draws, and having a lower chance of hemolysis. In developing countries, it is still common to draw blood using a syringe or syringes. Many brands have now started manufacturing Vaccutainer such as Vacu-8, Hemo Tube and Hemo Vac Plus. These tubes are now also available in pre-barcoded forms.
Sources: en.wikipedia.org
Infants can be infected during passage through the birth canal; nevertheless, newborns who acquire GBS through this route may only become colonized, and these colonized infants typically do not develop EOD. Roughly 50% of newborns to GBS colonized mothers are also GBS colonized, and (without prevention measures) 1–2% of these newborns will develop EOD. In the past, the incidence of EOD ranged from 0.7 to 3.7 per thousand live births in the US and from 0.2 to 3.25 per thousand in Europe.Multistate surveillance 2006-2015 shows a decline in EOD from 0.37 to 0.23 per 1000 live births in the US, but LOD remains steady at 0.31 per 1000 live births. In 2021 had been estimated a total of 1970 deaths (0.59/100,000 population) in the US were estimated to be caused by GBS neonatal infections. It was estimated that 226 infants (49 per 100,000) in the United States had a clinically significant GBS infection, and that approximately 11 (2.4%) of those cases resulted in death. The widespread use of intrapartum antibiotic prophylaxis (IAP) has resulted in a decline in the incidence of early neonatal GBS infection in the United States of more than 85%, from 1.8‰ of cases in live births in the 1990s to 0.23‰ in 2015, and to 0.18‰ in 2023.
During the recording of A Loner, Chanut used an old Marshall JMP head to add more upper mids, giving the sound a more defined character. To get a "really fat sound" in the studio, he used his Rivera electric guitar amplifier, the brand's first generation. For the electric guitar parts, the band wanted a "bright sound" with less gain and "to remove this flattering aspect" of the sub-bass characteristic of doom or sludge metal. To "let the music breathe more" and to highlight the guitar effects, particularly the reverbs, Thépegnier decided to "lighten" his drumming. Thépegnier further stated that they wanted to "lighten" their sound and achieve this "bright" result that would enable them to embrace "our cold ambiences even more. Getting out of our 'doomy' comfort zone". Journalist Jean-Charles Desgroux wrote that the band "dares to experiment" on A Loner and "beyond doom, sludge or at worst that muddy stoner which they will never claim". David wrote in his review of A Loner: "The French group experiments, plays with effects, textures and nuances". At this stage of their musical evolution, they demonstrated a greater presence of melodies and introspection and were sometimes more atmospheric. While Hangman's Chair blended various doom sounds to create an atmosphere on This Is Not Supposed To Be Positive, they sounded, on A Loner, like a different band from their earlier work, with gothic sounds closer to goth rock and cold wave than metal at this stage. The "stoner band" they had been in the past had nevertheless left some "artefacts" in their music.
Their diet in the wild primarily consists of dark green vegetables such as grasses and clovers, and excessive carrot consumption is unhealthy for them due to containing high levels of sugar. Tomato juice and sauce are ineffective at neutralizing the odor of a skunk. Rather, due to olfactory fatigue, a person sprayed by a skunk loses sensitivity to the smell over time. Effective treatments for skunk odor involve artificial compounds rather than household remedies. There is no such thing as an "alpha" in a wolf pack. An early study that coined the term "alpha wolf" had observed only unrelated adult wolves living in captivity. In the wild, wolf packs operate like families: parents are in charge until the young grow up and start their own families, and younger wolves do not overthrow an "alpha" to become the new leader. The phases of the Moon have no effect on the vocalizations of wolves, and wolves do not howl at the Moon. Wolves howl to assemble the pack usually before and after hunts, to pass on an alarm particularly at a den site, to locate each other during a storm, while crossing unfamiliar territory, and to communicate across great distances.
In the Buddhist Abhidharma traditions like the Theravāda, more systematized explanations of the twelve nidanas developed. As an expository device, the commentarial traditions of the Theravāda, sarvāstivāda-vaibhasika and sautrantika schools defended an interpretation which saw the 12 factors as a sequence that spanned three lives. This is sometimes referred to as the "prolonged" explanation of dependent origination. The three life interpretation can first be seen in the Paṭisambhidāmagga (I.275, circa 2nd or 3rd c. BCE). It is also defended by the Theravāda scholar Buddhaghosa (c. fifth century CE) in his influential Visuddhimagga (Vism.578–8I) and it became standard in Theravada. The three-lives model, with its "embryological" interpretation which links dependent origination with rebirth was also promoted by the Sarvāstivāda school as evidenced by the Abhidharmakosa (AKB.III.21–4) of Vasubandhu (fl. 4th to 5th century CE) and the Jñanaprasthana. Wayman notes that this model is also present in Asanga's Abhidharmasamuccaya and is commented on by Nagarjuna. The three lives interpretation can be broken down as follows:
Sources: en.wikipedia.org
13C + n → 14C In this case the atomic mass increases, but the element is unchanged. In other cases the product nucleus is unstable and decays, typically emitting protons, electrons (beta particle) or alpha particles. When a nucleus loses a proton the atomic number decreases by 1. For example,
== Simple flow models == Design equations are equations relating the space time to the fractional conversion and other properties of the reactor. Different design equations have been derived for different types of the reactor and depending on the reactor the equation more or less resemble that describing the average residence time. Often design equations are used to minimize the reactor volume or volumetric flow rate required to operate a reactor.
Michael Freedland (18 December 1934 – 1 October 2018); biographer, author, journalist and broadcaster; wrote for The Sunday Telegraph, The Spectator, The Guardian, The Observer, The Jewish Chronicle and The Economist; wrote and presented programmes for BBC Radio 2. His radio show You Don't Have To Be Jewish ran for 24 years. Ben Freeman, author of Jewish Pride: Rebuilding a People(2021); journalist for The Guardian, Billboard, The Jerusalem Post, The Times of Israel, Dazed Magazine, Jewish Journal (Los Angeles), Jewish News Reg Freeson (24 February 1926 – 9 October 2006), Labour politician of Russian Jewish and Polish Jewish ancestry; worked as journalist in the Middle East and continued print career in Fleet Street, where he worked on publications including John Bull, Everybody's Weekly, London Illustrated, News Review, Today, Education , The Daily Mirror and the News Chronicle; wrote for Tribune; edited anti-fascist magazine Searchlight; was co-chair of the socialist Zionist Poale Zion (Great Britain) and editor of Jewish Vanguard Matt Frei (born 26 November 1963) is a British-German television news journalist and writer, formerly the Washington, D.C. correspondent for Channel 4 News. He is now the channel's Europe editor and presenter of the evening news.
Sources: en.wikipedia.org
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.
Small short-term human trials examined metabolic markers such as lipids and glucose. The trials did not continue after rodent cancer findings, so long-term human safety is unknown.
Controlled human trials have not established a performance benefit. Anecdotal reports exist, but they are not reliable evidence.
Cardarine is an investigational synthetic compound that acts as a PPARδ agonist. It is also known as GW501516 and has been studied mainly in preclinical research. It is not an approved medicine.