The short version of Metabolic modulator fits in a sentence. The long version — which is the one that helps — is below.
This page was last updated on 2026-01-02 and is reviewed periodically as new material appears.
The compound is typically described as a laboratory compound rather than a therapeutic product. Published reports have explored its role in lipid disorders, insulin sensitivity, and exercise metabolism, yet no major drug regulator has approved it for medical use. Commercial samples sold under the cardarine name may vary in purity and identity. Analytical confirmation is therefore necessary when the material is discussed in scientific or regulatory contexts. Its classification as a prohibited substance in sport further shapes how it is studied and reported.
Cardarine is a common name for GW501516, a synthetic compound studied for its effects on lipid and glucose metabolism. It functions as an agonist at peroxisome proliferator-activated receptor delta, or PPARδ, a nuclear receptor that influences gene expression. The molecule is not a steroid, nor is it a selective androgen receptor modulator. It is also known in research and sports literature as GW-501516 and endurobol. Early laboratory work examined its metabolic activity in cell cultures and animal models.
Quality assessment for cardarine samples usually combines identity, purity, and impurity testing. Nuclear magnetic resonance spectroscopy and mass spectrometry can confirm molecular structure, while high-performance liquid chromatography estimates purity. Certificates of analysis from testing laboratories may list these results, but they do not establish safety or legality. In the absence of approved manufacturing, products sold online may contain the wrong compound, variable amounts, or unlisted contaminants. Independent verification is therefore central to analytical work and to interpreting any reported biological activity.
Laboratory detection of GW501516 commonly uses liquid chromatography coupled with tandem mass spectrometry. The method can identify the parent compound or its metabolites in urine and blood after sample cleanup. Protein precipitation, solid-phase extraction, or enzymatic hydrolysis may precede analysis, depending on the matrix. Reference standards are required for accurate quantification and confirmation. Because the compound is not approved, testing often occurs in anti-doping, forensic, or research settings rather than routine clinical care. Results are reported with limits of detection and quantification.
Stability of GW501516 depends on form, temperature, light exposure, and moisture. Solid reference material is typically stored frozen or refrigerated in a desiccator and protected from light. Solutions in organic solvents such as dimethyl sulfoxide are often kept frozen in aliquots to reduce freeze-thaw cycling. Aqueous solubility is low, so aqueous stock solutions can be difficult to prepare without cosolvents. Degradation may appear as changes in chromatographic purity or mass spectral signal. Stability studies are needed to establish shelf life for any specific preparation.
| Property | Value | Notes |
|---|---|---|
| Chemical class | Synthetic PPARδ agonist | Not a steroid or a selective androgen receptor modulator. |
| Common synonyms | Cardarine, GW501516, GW-501516, endurobol | Names vary by supplier and literature source. |
| Appearance | White to off-white powder | Consistent with many small-molecule research chemicals. |
| Solubility | Low in water; soluble in DMSO and ethanol | Often prepared in organic solvent for laboratory work. |
| Primary target | PPARδ (NR1C2) | Nuclear receptor involved in lipid and energy metabolism. |
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.
At the molecular level, GW501516 binds and activates PPARδ, a nuclear receptor that regulates transcription. Activation shifts expression of genes involved in fatty acid oxidation, energy expenditure, and lipid transport in skeletal muscle and liver. Animal studies report increased endurance and altered lipid profiles after exposure. Human data are limited to small trials and do not establish long-term safety or efficacy. PPARδ also has roles in cell proliferation, so the relationship between activation and cancer risk remains an open question.
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.
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.
== Side effects == Common or clinically important adverse effects of phenelzine include orthostatic hypotension, dizziness, dry mouth, constipation, urinary retention, sedation or somnolence, insomnia, weight gain, edema, sweating, sexual dysfunction, and reduced vitamin B6 levels or pyridoxine deficiency. Hypoglycemia and clinically relevant cytochrome P450 interactions may also occur, particularly with hydrazine MAOIs such as phenelzine. Rare adverse effects reported with phenelzine include hypomania or mania, psychosis, hepatotoxicity, and acute liver failure, the last of which has been reported mainly in susceptible individuals, including people with pre-existing liver damage, old age, long-term effects of alcohol consumption, or viral infection.
=== VGLUTs === Three types of vesicular glutamate transporters are known, VGLUTs 1–3 (SLC17A7, SLC17A6, and SLC17A8 respectively) and the novel glutamate/aspartate transporter sialin. These transporters pack the neurotransmitter into synaptic vesicles so that they can be released into the synapse. VGLUTs are dependent on the proton gradient that exists in the secretory system (vesicles being more acidic than the cytosol). VGLUTs have only between one hundredth and one thousandth the affinity for glutamate that EAATs have. Also unlike EAATs, they do not appear to transport aspartate.
=== Binding assays === Polyhistidine-tagging can be used to detect protein-protein interactions in the same way as a pull-down assay. Polyhistidine tagging has several advantages over other tags commonly used for pull-down assays, including its small size, high binding capacity of the resin, few naturally occurring proteins binding to the carrier matrices and the increased stability of the carrier matrix over monoclonal antibody matrices.
High concentrations of carbon dioxide can also be used to kill pests. Liquid carbon dioxide is used in supercritical drying of some food products and technological materials, in the preparation of specimens for scanning electron microscopy and in the decaffeination of coffee beans.
Type A1: abnormal oral glucose tolerance test (OGTT), but normal blood glucose levels during fasting and two hours after meals; diet modification is sufficient to control glucose levels Type A2: abnormal OGTT compounded by abnormal glucose levels during fasting or after meals; additional therapy with insulin or other medications is required Diabetes which existed before pregnancy is also split up into several subtypes under this system:
Sources: en.wikipedia.org
Apoptosis. During programmed cell death the ICE/ced-3 family of proteases (one of the interleukin-1β-converter proteases) degrade actin into two fragments in vivo; one of the fragments is 15 kDa and the other 31 kDa. This represents one of the mechanisms involved in destroying cell viability that form the basis of apoptosis. The protease calpain has also been shown to be involved in this type of cell destruction; just as the use of calpain inhibitors has been shown to decrease actin proteolysis and the degradation of DNA (another of the characteristic elements of apoptosis). On the other hand, the stress-induced triggering of apoptosis causes the reorganization of the actin cytoskeleton (which also involves its polymerization), giving rise to structures called stress fibers; this is activated by the MAP kinase pathway.
=== Economics === In February 1996, the FDA approved both the over-the-counter sale and the production of generic formulations of minoxidil. Upjohn replied to that by lowering prices to half the price of the prescription drug and by releasing a prescription 5% formula of Rogaine in 1997. In 1998, a 5% formulation of minoxidil was approved for nonprescription sale by the FDA. The 5% aerosol foam formula was approved for medical use in the US in 2006. The generic versions of the 5% aerosol foam formula were approved in 2017. In 2017, a study of pharmacy prices in four states for 41 over-the-counter minoxidil products which were "gender-specified" found that the mean price for minoxidil solutions was the same for women and men even though the women's formulations were 2% and the men's were 5%, while the mean price for minoxidil foams, which were all 5%, was 40% higher for women. The authors noted this was the first time gender-based pricing had been shown for a medication.
== International popularity == Subs or their national equivalents were already popular in many European, Asian, and Australasian countries when late 20th-century franchisee chain restaurants such as Subway and fast food outlets made them even more popular and increased the prevalence of the word sub. Many outlets offer non-traditional ingredient combinations. Major international chains include Firehouse Subs, Quiznos, Mr. Sub, Jersey Mike's, Jimmy John's, Potbelly Sandwich Shop, and the largest restaurant chain in the world, Subway.
The steepness of greatest curvature from 'mild' (< 45 D), 'advanced' (up to 52 D) or 'severe' (> 52 D); The morphology of the cone: 'nipple' (small: 5 mm and near-central), 'oval' (larger, below-center and often sagging), or 'globus' (more than 75% of cornea affected); The corneal thickness from mild (> 506 μm) to advanced (< 446 μm). Increasing use of corneal topography has led to a decline in use of these terms.
=== Clinical trials === The phase 1 clinical pharmacology trial described by Nishimura and colleagues evaluated insulin icodec in people with type 2 diabetes using a randomized, double-blind, double-dummy, active-controlled, multiple-dose, dose-escalation design. The study reported a mean half-life of 196 hours and glucose-lowering activity distributed across the weekly dosing interval, supporting further development as a once-weekly basal insulin. In ONWARDS 1, once-weekly insulin icodec was compared with once-daily insulin glargine U100 in adults with type 2 diabetes who had not previously used insulin. Insulin icodec was non-inferior, and statistically superior for reduction in glycated hemoglobin. The phase III ONWARDS clinical trial program evaluated once-weekly insulin icodec in adults with diabetes. ONWARDS 3 compared weekly icodec with daily insulin degludec in insulin-naïve adults with type 2 diabetes. Icodec produced a greater reduction in glycated hemoglobin after 26 weeks, with low absolute rates of clinically significant or severe hypoglycemia in both groups. ONWARDS 6 studied insulin icodec in adults with type 1 diabetes using a basal-bolus insulin regimen. Icodec was non-inferior to once-daily insulin degludec for reduction in glycated hemoglobin, but was associated with a higher rate of clinically significant or severe hypoglycemia.
Sources: en.wikipedia.org
=== Synaptogenesis === BDNF also enhances synaptogenesis. Synaptogenesis is dependent upon the assembly of new synapses and the disassembly of old synapses by β-adducin. Adducins are membrane-skeletal proteins that cap the growing ends of actin filaments and promote their association with spectrin, another cytoskeletal protein, to create stable and integrated cytoskeletal networks. Actins have a variety of roles in synaptic functioning. In pre-synaptic neurons, actins are involved in synaptic vesicle recruitment and vesicle recovery following neurotransmitter release. In post-synaptic neurons they can influence dendritic spine formation and retraction as well as AMPA receptor insertion and removal. At their C-terminus, adducins possess a myristoylated alanine-rich C kinase substrate (MARCKS) domain which regulates their capping activity. BDNF can reduce capping activities by upregulating PKC, which can bind to the adducing MRCKS domain, inhibit capping activity, and promote synaptogenesis through dendritic spine growth and disassembly and other activities.
=== Other Latin American and Caribbean === Prime Minister of Trinidad and Tobago Kamla Persad-Bissessar praised the US attack and encouraged more operations against drug traffickers, saying: "The pain and suffering the cartels have inflicted on our nation is immense. I have no sympathy for traffickers; the US military should kill them all violently." Raising concerns that the bodies washing ashore won't be investigated, and placing Trinidad and Tobago at odds with other CARICOM members, she supports the strikes, saying: "I much prefer seeing drug and gun traffickers blown to pieces than seeing hundreds of our citizens murdered each year because of drug-fueled gang violence." The family of one of the Trinidad missing said due process was not given and accused Trump of "killing poor people". Colombian president Gustavo Petro said that attacking the boat occupants in drug interdictions rather than capturing them amounted to murder. On 11 November, Petro announced he would suspend sharing of intelligence with the US while strikes on vessels continued; Efecto Cocuyo reported that Colombian Ministers of Defense and of the Interior stated on 13 November that Colombia would continue cooperating with the US. When asked whose side he was on, Brazilian president Luiz Inácio Lula da Silva said he was on the side of peace, favored negotiations, and that US forces in the Caribbean had become a source of tension.
=== Diagnosis === In case of foodborne illness, the diagnosis of B. cereus can be confirmed by the isolation of more than 100,000 B. cereus organisms per gram from epidemiologically implicated food, but such testing is often not done because the illness is relatively harmless and usually self-limiting.
=== Relationships === In 2012, Collins dated fellow The Only Way Is Essex cast member Charlie King. During their relationship, she had suspicions that King was gay. He later came out in 2014. Following their split, Collins began a relationship with mechanic Rami Hawash, whom she had previously dated in 2011, and the pair became engaged on 25 December 2013; however, the engagement was called off a few weeks later. In November 2014, Collins was assaulted by her then boyfriend, Alexander Moss, at her former home in Warley. Reflecting on the incident in 2017, she said her biggest regret was not pressing charges because she was "too scared to see it through". Collins briefly dated James Argent in 2012, before reuniting with ex-boyfriend, Rami. The pair reconciled in December 2017 when Argent professed his love for Collins during The Only Way Is Essexmas and they were in an on-and-off relationship until July 2020. Argent struggled with cocaine addiction which resulted in the breakdown of their relationship. Collins said Argent's addiction made her feel "suicidal" and caused her to suffer from post-traumatic stress disorder as a result. In December 2020, Collins rekindled her relationship with ex-fiancé, Rami Hawash. They reconnected again after attending a Madonna concert together. In July 2021, Collins confirmed their reunion after she was spotted wearing her engagement ring several months prior.
Sources: en.wikipedia.org
Cardarine is a common name for GW501516, a synthetic PPARδ agonist. It is not a steroid or a selective androgen receptor modulator. It was developed and studied as a research compound for metabolic pathways.
It binds to and activates PPARδ, a nuclear receptor that regulates genes related to fatty acid oxidation and energy use. This activation alters transcription in tissues such as skeletal muscle and liver. The full range of downstream effects in humans is not fully established.
No, cardarine is not known to occur naturally in plants, animals, or humans. It is a synthetic molecule produced for laboratory research. Products labeled as cardarine should therefore be treated as manufactured chemicals with variable purity.
LC-MS/MS is common, often after sample cleanup. The assay targets GW501516 or its metabolites.