Everything below concerns GW501516. We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Last reviewed on 2025-10-26. Where a claim depends on a specific study, the study is described rather than over-claimed.
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.
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.
| 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. |
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.
Legal status varies by country. In some places, cardarine is controlled under medicines or psychoactive substances laws; in others, it may be sold with minimal oversight as a research chemical. Customs agencies have intercepted shipments, and several national health agencies have issued warnings about products marketed for bodybuilding or performance enhancement. The lack of a standardized pharmaceutical supply means identity, purity, and contamination levels can differ widely between samples. These factors make cardarine a regulatory and public health concern rather than a conventional prescription drug.
Cardarine has no approved therapeutic indication and is not marketed as a medicine. The World Anti-Doping Agency lists GW501516 as a prohibited substance at all times, covering both in-competition and out-of-competition periods. National laws vary: some countries treat it as an unapproved drug subject to import controls, while others have specific restrictions on sale for human consumption. It is often sold as a research chemical, a label that does not imply safety or legality. Enforcement actions have targeted online vendors and shipments.
Anti-doping laboratories identify GW501516 and related metabolites using liquid chromatography coupled with tandem mass spectrometry. Urine is the most common matrix, though blood and dried blood spots may also be analyzed. The method targets the parent compound and phase I and phase II metabolites, which extend the detection window. Because the substance is prohibited at all times, athletes can be tested outside competition. Detection limits and windows depend on the assay, sample type, and individual metabolism.
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.
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.
The dose range of 1P-LSD is 100 to 200 μg, with a typical dose estimate of 150 μg. Its duration is about 8 to 12 hours for most people. The subjective effects of 1P-LSD are not well-defined in the literature, although they are generally thought to be comparable to those of LSD. In a 2020 study, the qualitative effects of 1P-LSD and LSD were similar when measured using visual analog scales. The properties of 1P-LSD have also been assessed in other studies.
Softening consists in preventing the possible precipitation of poorly soluble minerals from natural water due to changes occurring in the physico-chemical conditions (such as pCO2, pH, and Eh). It is applied when poorly soluble ions present in water might precipitate as insoluble salts (e.g., CaCO3, CaSO4...), or interact with a chemical process. The water is "softened" by exchanging poorly soluble divalent cations (mainly Ca2+, Mg2+ and Fe2+) with the soluble Na+ cation. Softened water has therefore a higher electrical conductivity than deionized water. Softened water cannot be considered as truly demineralized water, but does no longer contain cations responsible for the hardness of water and causing the formation of limescale, a hard chalky deposit essentially consisting of CaCO3, building up inside kettles, hot water boilers, and pipework.
The terminus of separation capillary was protruded from the tapered sheath-flow capillary. Because of thin wall of the separation capillary dead volume is low. As a result, the sensitivity and efficiency of separation increase. Using nanoflow electrospray regime (with small emitters and ESI flow rates below 1000 nl/min) also helps in increase sensitivity, reproducibility and robustness. For making this interface, borosilicate emitter with tapered tip and the separation capillary with etched end may be utilized. To enhance the stability and lifetime of the interface, gold coated emitter was applied.
Sources: en.wikipedia.org
Upon the UK's withdrawal from the European Union, the border in Ireland became the only land border between the UK and the EU. EU single market and UK internal market provisions require certain customs checks and trade controls at their external borders. The Northern Ireland Protocol is intended to protect the EU single market, while avoiding imposition of a 'hard border' that might incite a recurrence of conflict and destabilize the relative peace that has held since the end of the Troubles. Under the Protocol, Northern Ireland is formally outside the EU single market, but EU free movement of goods rules and EU Customs Union rules still apply; this ensures there are no customs checks or controls between Northern Ireland and the rest of the island. In place of an Ireland/Northern Ireland land border, the protocol has created a de facto customs border down the Irish Sea for customs purposes, separating Northern Ireland from the island of Great Britain, to the disquiet of prominent Unionists. To operate the terms of the protocol, the United Kingdom must provide border control posts at Northern Ireland's ports: actual provision of these facilities is the responsibility of Northern Ireland's Department of Agriculture, Environment and Rural Affairs (DAERA). Temporary buildings were put in place for 1 January 2021, but in February 2021, the responsible Northern Ireland minister, Gordon Lyons (DUP), ordered officials to stop work on new permanent facilities and to stop recruiting staff for them.
=== Introduction and History of DNA Legos === DNA origami has been used to assemble a range of two-dimensional and three-dimensional nanostructures; however, each different structure requires a new design and a new set of scaffold strand and staple strands. This limits scalability and structure yield efficiency. Researchers have developed “DNA brick” or “DNA Lego” technologies by making single stranded tiles (SSTs). SSTs allow for the production of larger structures without a scaffold strand and with the ease of arranging the predesigned blocks into bigger structures. Much like how actual Lego bricks allow specific assembly configurations, DNA Lego bricks bind at specific sites to form a range of shapes. Appropriate selection of blocks to include in an assembly mixture allows production of a variety of complex 3D shapes without a scaffold strand and without having to design an entirely different structure. With the DNA Lego brick approach, the DNA strand binds to neighboring strands to form a “brick”. By selecting subsets of strands to form a larger shape, researchers demonstrated that many 3D structures could be assembled from the same general set of components or bricks. The authors called this a “voxel-based” design strategy meaning that each 8-base pair interaction between bricks defines a voxel with dimensions 2.5 by 2.5 nm. Since each DNA interaction can be analogized to Lego construction, we can also claim one voxel corresponds to one stud Lego brick . This scaffold-free strategy has also been extended to larger multicomponent structures.
=== Qualitative analysis === For qualitative analysis, FD-MS can be applied to areas in biochemistry, medicine, salts, polymers and environmental analysis. For example, in biochemistry, it can be used to characterize peptides, nucleosides and nucleotides, pesticides, and vitamins. In medicine, it can be applied to cancer drugs and their metabolites, and antibiotics.
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.
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.