A practical reference on LC-MS/MS: what it is, how it behaves, what the literature reports, and where the honest uncertainties sit.
Reviewed 2025-09-05. Anything still debated is marked as such rather than presented as settled.
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.
Regulatory treatment of cardarine differs by context and jurisdiction. In competitive sport, the World Anti-Doping Agency lists PPARδ agonists, including GW501516, as prohibited at all times. Outside sport, it lacks approval as a prescription medicine in major drug markets, and products sold for human consumption may be treated as unapproved drugs. Some countries also restrict importation or sale through general consumer protection and medicines laws. These classifications affect availability, testing, and legal risk without establishing therapeutic value.
Because cardarine is not an approved medicine, no pharmacopeial monograph defines its identity, purity, or storage requirements. Laboratories typically rely on in-house methods and reference standards when testing materials labeled as GW501516. Certificates of analysis may report purity and identity for a specific batch, but their scope varies and they do not guarantee safety or legal status. Independent verification can include high-performance liquid chromatography, mass spectrometry, nuclear magnetic resonance, and elemental analysis. The distinction between research chemical labeling and human use is significant because quality standards and oversight differ.
Cardarine can be detected in biological samples and product materials using liquid chromatography coupled to tandem mass spectrometry (LC-MS/MS). The method separates compounds by chromatography and identifies them by mass-to-charge transitions, allowing low-level detection in urine or blood. Sample preparation often involves enzymatic hydrolysis, solid-phase extraction, or protein precipitation. Certified reference materials and isotope-labeled internal standards improve quantification. Detection windows depend on metabolism, matrix, and assay sensitivity, so no single universal window applies.
| 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. |
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.
Laboratory studies have examined GW501516 in cell cultures and rodents for conditions such as dyslipidemia, insulin resistance, and obesity. Some trials in humans were initiated, but development was discontinued after preclinical findings raised concerns about cancer in certain models. Those findings do not prove that the compound causes cancer in people, but they contributed to regulatory caution. Later reviews often describe the evidence as preliminary and insufficient for assessing long-term safety.
In the fitness and bodybuilding literature, cardarine is frequently discussed as an endurance agent or fat-loss compound, although such claims are not supported by robust clinical evidence. Online descriptions often mix animal data, user anecdotes, and marketing language. Researchers who study PPARδ agonists distinguish between receptor activation in controlled experiments and unsupervised use of unverified products. The latter introduces unknown purity, dose, and interactions, making reported experiences difficult to interpret scientifically.
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.
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.
=== Pancreatitis and pancreatic cancer === An association of the DPP-IV inhibitor class with pancreatic problems has been proposed, mainly based on case reports associated with the DPP-IV inhibitor sitagliptin and several incretin mimetics including exenatide. A 2013 study of the DPP-4 inhibitor sitagliptin reported found "worrisome changes in the pancreases of the rats that could lead to pancreatic cancer". A second paper by the same authors reported an increase in precancerous lesions in the pancreases of organ donors who had taken GLP-1 inhibitors. In response to these reports, the United States FDA and the European Medicines Agency each undertook independent reviews of all clinical and preclinical data related to the possible association of DPP-IV inhibitors with pancreatic cancer. In a joint letter to the New England Journal of Medicines, the agencies stated that "Both agencies agree that assertions concerning a causal association between incretin-based drugs and pancreatitis or pancreatic cancer, as expressed recently in the scientific literature and in the media, are inconsistent with the current data. The FDA and the EMA have not reached a final conclusion at this time regarding such a causal relationship.
== Georgian Parliamentary Commission Report == A Georgian parliamentary commission published a report on the war on 18 December 2008. The report said in its beginning that "Russia's aggression against Georgia has not started in August, 2008". The report, after recounting the events in Abkhazia and South Ossetia in the 1990s, proceeded to describe pre-war timeline in detail. It also said that inability of the Georgian authorities "to de-legitimize the presence of Russian peacekeepers can be considered the major shortcoming of the Georgian authorities in a pre-August period." The Russian peacekeepers were full-fledged combatants in the war, according to the commission and they had attacked the Georgian citizens before the war. The report said that officials did not succeed "to properly analyze" the scale of the threat from Russia before August 2008. The National Security Council was also criticized because it had "failed to plan the actions in a timely manner." The commission said that there was a lack of coordination between officials during the war and the specially designated formal procedures were not observed.
The College of Allied Health Sciences (CAHS) provides education for allied health and health science professionals. CAHS became a college at the University of Cincinnati in March 1998. Its programs originated from various colleges at the University of Cincinnati.
== Dosage comparison == For constant pain, the relieving effect of extended-release morphine given once (for Kadian) or twice (for MS Contin) every 24 hours is roughly the same as multiple administrations of immediate release (or "regular") morphine. Morphine sulfate pentahydrate (trade names including Dolcontin) has a higher molecular mass than morphine base, and therefore 10 mg morphine sulfate pentahydrate contains approximatively 7.5 mg of morphine free base. Extended-release morphine can be administered together with "rescue doses" of immediate-release morphine pro re nata in case of breakthrough pain, each generally consisting of 5% to 15% of the 24-hour extended-release dosage.
Sources: en.wikipedia.org
== History == Fenfluramine as a single drug was first introduced in the 1970s, but was not popular because it only temporarily reduced weight. A 1984 study found a weight loss of 7.5 kg on average in 24 weeks, as compared to 4.4 kg under placebo. It sold modestly until the 1990s, when it was combined with phentermine and heavily marketed.
=== Archaeobotanical record and ruderal habitat === The interaction between the Moche and this wild species is supported by its ecological behavior and archaeobotanical findings in the La Libertad Region. Solanum pimpinellifolium behaves as a ruderal plant, proliferating naturally and constantly along the edges of irrigation canals, ditches, and humid depressions built by pre-Hispanic agricultural engineers. Contemporary botanical and archaeological inventories have recorded stable populations of this wild tomato growing directly over the cultural contexts of major Moche political-religious centers, such as the El Brujo Arqueological Complex (in the Chicama Valley) and near the Huaca del Rosario (in Magdalena de Cao). This resource holds high scientific and historical value because Peru is a key center of origin for the tomato, hosting 14 of the world's 17 tomato species. Research by Peru's Ministry of the Environment indicates that roughly 90% of the genes in modern commercially cultivated tomatoes worldwide originate from these wild Andean relatives, which contributed high natural sugar levels and lycopene content to ancient diets.
==== Body composition and strength improvements ==== Anabolic steroids influence muscle fiber characteristics, affecting both the size and type of muscle fibers. This alteration significantly contributes to enhanced muscle strength and endurance. Anabolic-androgenic steroids (AAS) cause these changes by directly impacting the muscle tissue's cellular components. Studies have shown that these changes are not merely superficial but represent a profound transformation in the muscle's structural and functional properties. This transformation is a key factor in the steroids' ability to enhance physical performance and endurance. Body weight in men may increase by 2 to 5 kg as a result of short-term (<10 weeks) AAS use, which may be attributed mainly to an increase of lean mass. Animal studies also found that fat mass was reduced, but most studies in humans failed to show significant fat mass decrements. The effects on lean body mass have been shown to be dose-dependent. Both muscle hypertrophy and the formation of new muscle fibers have been observed. The hydration of lean mass remains unaffected by AAS use, although small increments of blood volume cannot be ruled out. The upper region of the body (thorax, neck, shoulders, and upper arm) seems to be more susceptible for AAS than other body regions because of predominance of ARs in the upper body. The largest difference in muscle fiber size between AAS users and non-users was observed in type I muscle fibers of the vastus lateralis and the trapezius muscle as a result of long-term AAS self-administration.
== Licences == SIRIUS is developed by the group of Sebastian Böcker at the FSU Jena in close collaboration with the Bright Giant GmbH. SIRIUS is provided as a software-as-a-service solution. The client software is open-source and installed on the users' computers. Molecular formula annotation using fragmentation trees and isotope pattern analysis is performed on your local computer without subscription requirement. The SIRIUS web services for structural elucidation, including molecular fingerprint prediction, structure database search, confidence score assessment and compound class prediction, require a user account. The web services are free for academic/non-commercial use provided/hosted by the FSU Jena. Academic institutions are identified by their email domain and access will be granted automatically. In some cases, further validation might be required. Bright Giant GmbH offers subscription-based access to the SIRIUS web services for structural elucidation for commercial users.
=== South American think tanks === Research done by Enrique Mendizabal shows that South American think tanks play various roles depending on their origins, historical development and relations to other policy actors. In this study, Orazio Bellettini from Grupo FARO suggests that they:
Sources: en.wikipedia.org
Chazuke (茶漬け, ちゃづけ) or ochazuke (お茶漬け, from (o)cha 'tea' + tsuke 'submerge') is a simple Japanese dish made by pouring green tea, dashi, or hot water over cooked rice. Toppings are often added; common toppings include furikake, nori (seaweed), sesame seeds, scallions, tsukemono (pickled vegetables), umeboshi (pickled plum), shiokara (pickled seafood), tarako (salted and marinated pollock roe), salted salmon, and wasabi. Chazuke provides a way to use leftover rice as a quick snack because it is easy to make. In Kyoto, ochazuke is known as bubuzuke. Since the 1970s, packaged "instant ochazuke", consisting of freeze-dried toppings and seasonings, has become popular.
1 μg RAE = 1 μg retinol from food or supplements 1 μg RAE = 2 μg all-trans-β-carotene from supplements 1 μg RAE = 12 μg of all-trans-β-carotene from food 1 μg RAE = 24 μg α-carotene or β-cryptoxanthin from food RAE takes into account carotenoids' variable absorption and conversion to vitamin A by humans better than and replaces the older retinol equivalent (RE) (1 μg RE = 1 μg retinol, 6 μg β-carotene, or 12 μg α-carotene or β-cryptoxanthin). RE was developed 1967 by the United Nations/World Health Organization Food and Agriculture Organization (FAO/WHO).
==== Unmarked grave ==== In many cultures graves are marked with durable markers, or monuments, intended to help remind people of the buried person. An unmarked grave is a grave with no such memorial marker.
After his daughter was born, Marrow enlisted in the United States Army in October 1977. Following basic training, Marrow was assigned to the 25th Infantry Division. During his time in the army Marrow was involved with a group of soldiers charged with the theft of a rug. While awaiting trial, he received a $2,500 bonus check and went absent without leave (AWOL), returning a month later, after the rug had been returned. Marrow received a non-judicial punishment as a consequence of his dereliction of duty. During his spell in the Army, Marrow became interested in hip-hop. He heard The Sugarhill Gang's newly released single "Rapper's Delight" (1979), which inspired him to perform his own raps over the instrumentals of this and other early hip-hop records. The music, however, did not fit his lyrics or form of delivery. When he was stationed in Hawaii (where prostitution was not a heavily prosecuted crime) as a squad leader at Schofield Barracks, Marrow met a pimp named Mac. Mac admired that Marrow could quote Iceberg Slim, and he taught Marrow how to be a pimp himself. Marrow was also able to purchase stereo equipment cheaply in Hawaii, including two Technics turntables, a mixer, and large speakers. Once equipped, he then began to learn turntablism and rapping. Marrow learned from his commanding officer that he could receive an early honorable discharge because he was a single father. Taking advantage of this, Marrow was discharged as a Private First Class (PFC - E3) in December 1979 after serving for two years and two months.
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.
Anti-doping laboratories typically use LC-MS/MS to detect GW501516 and its metabolites in urine. The method is sensitive and can identify the compound at low concentrations. Detection depends on sample timing, metabolism, and the specific assay.