This is a working overview of Metabolite, written for readers who want more than a one-paragraph summary but less than a textbook.
This page was last updated on 2025-07-30 and is reviewed periodically as new material appears.
Published literature on cardarine includes in vitro assays, rodent experiments, and a small number of human studies. Reports describe effects on exercise capacity and lipid metabolism in animals, while human evidence is sparse. Many online descriptions present the compound as a proven endurance aid, a claim not supported by regulatory approval or large clinical trials. Analytical studies focus on identifying the parent compound and its metabolites in biological samples. Important uncertainties include species differences, dose-response relationships, and the relevance of rodent tumor findings to humans.
Cardarine is the common name for GW501516, a synthetic compound studied as a peroxisome proliferator-activated receptor delta agonist. Researchers developed it to explore treatments for lipid disorders and metabolic conditions. It is not an approved medicine in any country. Early clinical work examined changes in HDL cholesterol and triglycerides, but development was discontinued after animal studies raised concerns about cancer. The compound remains available as a research chemical and appears in discussions of performance enhancement.
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.
| Property | Value | Notes |
|---|---|---|
| Common name | Cardarine | Also called GW501516 and endurobol. |
| Chemical formula | C21H18F3NO3S2 | Molecular weight about 453.5 g/mol. |
| Appearance | White to off-white solid | Form depends on synthesis and purity. |
| Solubility | Soluble in DMSO and ethanol | Low solubility in water. |
| Typical storage | -20 °C, desiccated, protected from light | Common for research chemicals. |
Cardarine is not approved for human therapeutic use in any major jurisdiction. It appears on the World Anti-Doping Agency Prohibited List as a PPARδ agonist within the hormone and metabolic modulators category. Sports organizations test for it because it has been detected in athlete samples and seized products. Regulatory actions against marketed research chemical versions have occurred in several countries, though enforcement varies. Availability through unregulated channels complicates oversight.
Analytical laboratories typically identify cardarine and its metabolites using liquid chromatography-tandem mass spectrometry. Urine is a common matrix in anti-doping testing, while blood and tissue may be used in research settings. Detection windows depend on the assay, the sample matrix, and the compound's metabolism. Because cardarine is extensively metabolized, laboratories often target specific metabolites to improve sensitivity and confirmation. Reference standards are required for reliable quantification. Method validation includes checks for selectivity, linearity, and carryover.
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.
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 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.
A peptidomimetic is a small protein-like chain designed to mimic a peptide. They typically arise either from modification of an existing peptide, or by designing similar systems that mimic peptides, such as peptoids and β-peptides. Irrespective of the approach, the altered chemical structure is designed to advantageously adjust the molecular properties such as stability or biological activity. This can have a role in the development of drug-like compounds from existing peptides. Peptidomimetics can be prepared by cyclization of linear peptides or coupling of stable unnatural amino acids. These modifications involve changes to the peptide that will not occur naturally (such as altered backbones and the incorporation of nonnatural amino acids). Unnatural amino acids can be generated from their native analogs via modifications such as amine alkylation, side chain substitution, structural bond extension cyclization, and isosteric replacements within the amino acid backbone. Based on their similarity with the precursor peptide, peptidomimetics can be grouped into four classes (A – D) where A features the most and D the least similarities. Classes A and B involve peptide-like scaffolds, while classes C and D include small molecules (Figure 1).
== External links == "Opioid Receptors: κ". The International Union of Basic and Clinical Pharmacology, The British Pharmacological Society, The University of Edinburgh. International Union of Basic and Clinical Pharmacology. Archived from the original on 2014-02-23. Retrieved 2007-07-23. kappa+Opioid+Receptor at the U.S. National Library of Medicine Medical Subject Headings (MeSH)
=== Anti-terrorism preparation === Among more than 270,000 US military service members vaccinated with smallpox vaccine between December 2002, and March 2003, eighteen cases of probable myopericarditis were reported (all in first-time vaccinees who received the NYCBOH strain of vaccinia virus), an incidence of 7.8 per 100,000 during the 30 days they were observed. All cases were in young, otherwise healthy adult white men and all survived. In 2002, the United States government started a program to vaccinate 500,000 volunteer health care professionals throughout the country. Recipients were healthcare workers who would be first-line responders in the event of a bioterrorist attack. Many healthcare workers refused or did not pursue vaccination, worried about vaccine side effects, compensation and liability. Most did not see an immediate need for the vaccine. Some healthcare systems refused to participate, worried about becoming a destination for smallpox patients in the event of an epidemic. Fewer than 40,000 actually received the vaccine. On 21 April 2022, Public Services and Procurement Canada published a notice of tender seeking to stockpile 500,000 doses of smallpox vaccine in order to protect against a potential accidental or intentional release of the eradicated virus. On 6 May, the contract was awarded to Bavarian Nordic for their Imvamune vaccine. These were deployed by the Public Health Agency of Canada for targeted vaccination in response to the 2022 mpox outbreak.
== Function == FLAP is necessary for the activation of 5-lipoxygenase and therefore for the production of leukotrienes, 5-hydroxyeicosatetraenoic acid, 5-oxo-eicosatetraenoic acid, and specialized pro-resolving mediators of the lipoxin and resolvin classes. It is an integral protein within the nuclear membrane. FLAP is necessary in synthesis of leukotriene, which are lipid mediators of inflammation that is involved in respiratory and cardiovascular diseases. FLAP functions as a membrane anchor for 5-lipooxygenase and as an amine acid-bind protein. How FLAP activates 5-lipooxygenase is not completely understood, but there is a physical interaction between the two. FLAP structure consists of 4 transmembrane alpha helices, but they are found in trimer forming a barrel. The barrel is about 60 Å high and 36 Å wide.
Sources: en.wikipedia.org
== Purification == Purification is achieved by differential centrifugation – the sequential increase in gravitational force results in the sequential separation of organelles according to their density.
high in certain proteinase inhibitors that suppress appetite - e.g. potatoes solid (which takes longer to digest than liquid foods, though liquids have high satiety for a short period) The protein leverage hypothesis posits that human beings will prioritize the consumption of protein in food over other dietary components, and will eat until protein needs have been met, regardless of energy content, thus leading of over-consumption of foodstuffs when their protein content is low. Sugar-sweetened beverages showed lower satiety compared to isocaloric semi-skimmed milk. Alcoholic beverages tend to have a lower satiety per calorie. Fruit juice with and without pulp was shown to result in lower satiety than comparable amounts of fruits.
A public university, state university, or public college is a university or college that is owned by the state or that receives significant funding from a government. Whether a national university is considered "public" varies from one country (or region) to another, largely depending on the specific education landscape. In contrast a private university is usually owned and operated by a private corporation (not-for-profit or for profit). Both types are often regulated, but to varying degrees, by the government.
Sources: en.wikipedia.org
In a study with 17 volunteers, blood and saliva samples were collected before and at 15, 30, 60 and 240 min after ingesting 1 g of paracetamol. Detection from stimulated saliva and plasma with PA-MS provided a reliable result that can aid in making timely treatment decisions. Moreover, participants' views of blood and saliva sampling procedures were assessed qualitatively, showing a preference for non-invasive sampling.
== Application == One of the primary applications of hybrid containers is in pharmaceutical cold-chain logistics to keep pharmaceutical products, such as vaccines or active ingredients, within strict temperature ranges. Currently, this technology is only being used in a limited number of shipping containers. Examples of hybrid shipping container systems include SkyCell 1500X, SkyCell 6500X, va-Q-tec va-Q-one, and Tower Cold Chain KTEvolution. Other temperature-controlled container providers, including Peli BioThermal and World Courier, offer solutions incorporating thermal energy storage and advanced insulation technologies.
AlbuRx, Alburex, Albumeon, Human Albumin Behring, Albuminar 25, human albumin solution (5%, 20% or 25% human albumin solutions) Berinert P, freeze-dried human C1-esterase inhibitor (C1-INH) concentrate Beriplex P/N, freeze-dried human prothrombin complex concentrate Haemocomplettan P, RiaSTAP, freeze-dried human fibrinogen (factor I) concentrate Kybernin P, freeze-dried human antithrombin III concentrate Streptase, freeze-dried streptokinase Wound Healing:
Sources: en.wikipedia.org
Cardarine is a common name for the investigational compound GW501516. It acts as a PPARδ agonist and is not approved for human use. It is prohibited in sport.
It activates PPARδ, a nuclear receptor that influences gene expression related to lipid and energy metabolism. Animal studies show changes in endurance and lipid levels. Human effects and risks are not well established.
No, cardarine is not a steroid. It belongs to a different chemical class, the PPARδ agonists. It is also not a selective androgen receptor modulator.
It binds to and activates PPAR delta, a nuclear receptor that controls expression of genes related to fatty acid oxidation. This mechanism can alter energy metabolism in animal models. It is not a direct stimulant or fat-burning enzyme.