Everything below concerns LC-MS/MS. We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Last reviewed on 2026-04-11. Where a claim depends on a specific study, the study is described rather than over-claimed.
Anti-doping laboratories detect GW501516 and its metabolites using liquid chromatography-tandem mass spectrometry. Urine is the most common matrix, though blood and dried blood spots may also be used in some programs. Detection depends on factors such as dose, timing, metabolism, and the sensitivity of the assay. Published methods describe limits of detection in the low nanogram per milliliter range for related compounds. Exact detection windows are not fixed for all situations and remain an area of ongoing study.
Products sold as cardarine have been found to contain incorrect compounds, variable amounts, or no active ingredient at all. Independent testing is required to verify identity and purity. Common analytical approaches include high-performance liquid chromatography, mass spectrometry, and nuclear magnetic resonance for structural confirmation. These methods can distinguish GW501516 from related PPAR agonists and from unrelated steroids. For regulators and researchers, such verification is central to interpreting both biological results and adverse event reports.
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.
A persistent misconception is that cardarine is a fat-burning drug or a safe alternative to anabolic steroids. No approved therapeutic product exists, and human safety data are limited. The tumor findings in rodents remain a central concern in scientific reviews. Products sold online may contain inaccurate labels, impurities, or different compounds entirely, which complicates any assessment of effects. Independent testing of such products has reported frequent mislabeling. For these reasons, discussions in the literature emphasize risks and unknowns rather than benefits.
| Property | Value | Notes |
|---|---|---|
| Regulatory status | Prohibited in sport | Listed by WADA as a metabolic modulator. |
| Approved medical use | None in major jurisdictions | Not a registered drug. |
| Common test matrix | Urine | Most anti-doping samples use urine. |
| Typical detection method | LC-MS/MS | Detects parent compound and metabolites. |
| Reference standard storage | -20 °C, desiccated | Typical for analytical standards. |
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.
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 common misconception is that cardarine has been proven safe for human use. In reality, human clinical data are limited, and long-term animal studies have raised concerns about cancer. Another misconception is that it is a supplement or vitamin-like compound. It is a synthetic research chemical with no approved medical indication. Scientific discussion often focuses on its mechanism and detection rather than therapeutic use. Regulatory and anti-doping literature treats it primarily as a prohibited substance.
=== Search and discussion === One of the central discussion forums was Reddit's /r/DarkNetMarkets/, which has been the subject of legal investigation, as well as the Tor-based discussion forum, The Hub. On March 21, 2018, Reddit administrators shut down the popular subreddit /r/DarkNetMarkets citing new changes to their content policy that forbids the sale of "Drugs, including alcohol and tobacco, or any controlled substances". This led to the rise of Dread, the dedicated darknet discussion forum and the news site Darknetlive (since closed). Some marketplaces maintain their own dedicated discussion forums and subreddits. The majority of the marketplaces are in English, but some have opened in Chinese, Russian, and Ukrainian. The dedicated market search engine Grams (closed December 2017) allowed the searching of multiple markets directly without login or registration. Dark web news and review sites such as the former DeepDotWeb, and All Things Vice provide exclusive interviews and commentary into the dynamic markets. Uptime and comparison services provide sources of information about active markets as well as suspected scams and law enforcement activity. Due to the decentralized nature of these markets, phishing and scam sites are often maliciously or accidentally referenced. After discovering the location of a market, a user must register on the site, sometimes with a referral link, after which they can browse listings. A further PIN may be required to perform transactions, better protecting users against login credential compromise.
=== Phytochemistry === Natural tobacco polysaccharides, including cellulose, have been shown to be the primary precursors of acetaldehyde in tobacco smoke. The main polyphenols contained in the tobacco leaf are rutin and chlorogenic acid. Amino acids contained include glutamic acids, asparagine, glutamine, and γ-Aminobutyric acid. Pyridine alkaloids are present in tobacco as free bases and salts. Nicotine accounts for 90–95% of the plant's pyridines with nornicotine and anatabine accounting for roughly 2.5% each. Pyridyl functional groups present in minute amounts include anabasine, myosmine, cotinine and 2, 3′-bipyridyl. Indole alkaloids are also present in leaves and stems which includes harmala alkaloids as well. Yohimbine, harmine, harmaline and ajmalicine occurs in descending order, yohimbine being highest. The tobacco plant readily absorbs heavy metals from the surrounding soil and accumulates them in its leaves. These are readily absorbed into the user's body following smoke inhalation. Tobacco also contains the following phytochemicals: glucosides (tabacinine, tabacine), 2,3,6-trimethyl-1,4-naphthoquinone, 2-methylquinone, 2-Naphthylamine, propionic acid, anthalin, anethole, acrolein, cembrene, choline, nicotelline, nicotianine, and pyrene.
=== Supply Chain & Freight === Supply Chain & Freight (UPS-SCS for UPS Supply Chain Solutions) includes UPS' forwarding and contract logistics operations and other related business units. UPS' forwarding and logistics business provides services in more than 175 countries and territories worldwide and includes worldwide supply chain design, execution and management, freight forwarding and distribution, customs brokerage, mail and consulting services. Other business units within this segment include The UPS Store and UPS Capital.
Sources: en.wikipedia.org
Trails has been praised for its character arcs and worldbuilding, with its scope and sense of continuity being compared to the A Song of Ice and Fire novels by George R. R. Martin, the Forgotten Realms setting for Dungeons & Dragons, and the Marvel Cinematic Universe. Despite the series' English localization being praised for their quality, their slow release pace has been criticized, with them tending to lag years behind the original Japanese games. The music written for the series by Falcom Sound Team jdk, the company's team of composers, has also been praised. Characters or other elements from Trails have been featured in crossover promotions with other games, including Monster Hunter Frontier G, Chain Chronicle V, Dead or Alive 5, Fantasy Earth Zero, Langrisser Mobile, Utawarerumono: Zan, Valkyrie Anatomia, and a few Japanese mobile games. Characters from the series were also featured in a 2019 collaboration event with VREX, a virtual reality game arcade and café in Japan. As of 2021, a list of Trails characters was the largest article on the Japanese Wikipedia at over 440,000 characters. As of 2025, the series had sold nine million copies worldwide.
=== Fatty acids === Plant-based, or vegetarian, sources of Omega 3 fatty acids include soy, walnuts, pumpkin seeds, canola oil, kiwifruit, hempseed, algae, chia seed, flaxseed, echium seed and leafy vegetables such as lettuce, spinach, cabbage and purslane. Purslane contains more Omega 3 than any other known leafy green. Olives (and olive oil) are another important plant source of unsaturated fatty acids. Plant foods can provide alpha-linolenic acid which the human body uses to synthesize the long-chain n-3 fatty acids EPA and DHA. EPA and DHA can be obtained directly in high amounts from oily fish, fish oil, or algae oil. Vegetarians, and particularly vegans, have lower levels of EPA and DHA than meat-eaters. While the health effects of low levels of EPA and DHA are unknown, it is unlikely that supplementation with alpha-linolenic acid will significantly increase levels.. Significantly, for vegetarians, certain algae such as spirulina are good sources of gamma-linolenic acid (GLA), alpha-linolenic acid (ALA), linoleic acid (LA), stearidonic acid (SDA), eicosapentaenoic acid (EPA), docosahexaenoic acid (DHA), and arachidonic acid (AA).
=== Storage and excretion === How fast B12 levels change depends on the balance between how much B12 is obtained from the diet, how much is secreted and how much is absorbed. The total amount of vitamin B12 stored in the body is about 2–5 mg in adults. Around 50% of this is stored in the liver. Approximately 0.1% of this is lost per day by secretions into the gut, as not all these secretions are reabsorbed. Bile is the main form of B12 excretion; most of the B12 secreted in the bile is recycled via enterohepatic circulation. Excess B12 beyond the blood's binding capacity is typically excreted in urine. Owing to the extremely efficient enterohepatic circulation of B12, the liver can store 3 to 5 years' worth of vitamin B12; therefore, nutritional deficiency of this vitamin is rare in adults in the absence of malabsorption disorders. In the absence of intrinsic factor or distal ileum receptors, only months to a year of vitamin B12 are stored.
Sources: en.wikipedia.org
Legal status varies by country, but cardarine is not approved as a medicine in major jurisdictions. It is often sold as a research chemical, a category that may not be lawful for human use. Buyers should check local laws and product labels carefully.
Anti-doping laboratories use LC-MS/MS to detect GW501516 and its metabolites, usually in urine. The method can identify the parent compound at low concentrations. Detection windows vary with dose and individual factors.
No, cardarine has no approved medical uses in major jurisdictions. Early research explored metabolic conditions, but those programs were discontinued. It is not a registered treatment for any disease.
No. Cardarine has not received approval for human therapeutic use in major jurisdictions. It remains an investigational compound.