Complete Guide to GW 501516 (Cardarine): Benefits, Dosage & Research

In the relentless pursuit of peak physical performance and an optimized physique, fitness enthusiasts, bodybuilders, and athletes are constantly seeking cutting-edge research compounds. Among these, GW 501516, commonly known as Cardarine or Endurabol, has emerged as a prominent subject of scientific inquiry, particularly for its profound effects on endurance and metabolic function. Often mistakenly categorized with SARMs (Selective Androgen Receptor Modulators), Cardarine operates through a distinct pathway, offering a unique profile of research-backed benefits.

This comprehensive guide delves deep into the world of GW 501516, exploring its intricate mechanisms, the wealth of research surrounding its benefits, recommended dosages for scientific studies, and crucial safety considerations. Whether you are a researcher aiming to understand its metabolic impact or an athlete curious about the science behind enhanced stamina, this article provides an evidence-based overview of one of the most talked-about research compounds in the fitness community. Prepare to unlock the full potential of GW 501516 as we navigate its complex science and practical implications for research.

What is GW 501516 (Cardarine)? Understanding the PPAR-delta Agonist

GW 501516, or Cardarine, is a Peroxisome Proliferator-Activated Receptor delta (PPAR-delta) agonist. Developed in the early 1990s by GlaxoSmithKline and Ligand Pharmaceuticals, its initial research focus was on treating metabolic diseases like obesity, diabetes, and cardiovascular issues. Unlike anabolic steroids or SARMs, Cardarine does not directly interact with androgen receptors, meaning it doesn’t cause hormonal fluctuations typically associated with such compounds. This fundamental distinction is crucial for researchers, as it positions GW 501516 as a compound with a unique mechanism of action, primarily centered on metabolic regulation.

The term "PPAR-delta agonist" signifies that Cardarine activates the PPAR-delta pathway in the body. This pathway is a critical regulator of genes involved in energy expenditure, fatty acid oxidation, and glucose metabolism. By activating these receptors, Cardarine essentially signals the body to shift its primary fuel source from carbohydrates to fats, leading to a host of downstream effects that are highly beneficial for endurance, fat loss, and overall metabolic health in research models.

Mechanism of Action: How Cardarine Unleashes Metabolic Power

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The profound effects of GW 501516 stem from its potent activation of the PPAR-delta receptor. Found in tissues throughout the body, including skeletal muscle, liver, and adipose tissue, PPAR-delta plays a pivotal role in regulating cellular energy homeostasis. When Cardarine binds to and activates these receptors, it initiates a cascade of molecular events that profoundly alter metabolic processes.

PPAR-delta Activation and Gene Expression

Upon activation, PPAR-delta forms a complex with the Retinoid X Receptor (RXR), which then binds to specific DNA sequences known as PPAR response elements (PPREs). This binding modulates the transcription of genes involved in:

• Fatty Acid Oxidation: Cardarine significantly upregulates genes responsible for the breakdown of fatty acids for energy. This includes increased expression of enzymes like carnitine palmitoyltransferase-1 (CPT-1) and acyl-CoA oxidase (ACO), which are crucial for transporting and oxidizing fats within mitochondria.
• Glucose Uptake: While promoting fat utilization, Cardarine also enhances glucose uptake in skeletal muscle, improving insulin sensitivity. This dual action helps optimize energy substrate utilization, preventing the accumulation of glucose as fat and improving the body’s response to insulin.
• Mitochondrial Biogenesis: Research suggests that GW 501516 can stimulate the formation of new mitochondria, particularly in muscle tissue. Mitochondria are the "powerhouses" of the cell, and an increase in their number and efficiency directly translates to enhanced aerobic capacity and endurance.

The Shift in Fuel Preference

One of the most remarkable consequences of Cardarine’s mechanism is its ability to induce a metabolic shift, compelling the body to prefer fat as a primary energy source over carbohydrates. This "fat-burning" effect is incredibly valuable for endurance athletes, as it spares glycogen stores, delaying fatigue and allowing for prolonged physical activity. For individuals seeking to reduce body fat, this enhanced lipid metabolism contributes to more efficient fat loss, even in a caloric deficit, while helping to preserve lean muscle mass.

In essence, GW 501516 acts as a metabolic master switch, reprogramming the body’s energy pathways to be more efficient, resilient, and optimized for sustained performance. This intricate interplay at the genetic and cellular level underpins the wide array of benefits observed in research subjects.

The Science-Backed Benefits of GW 501516 (Cardarine)

Research into GW 501516 has unveiled a compelling profile of benefits, primarily centered around its metabolic and performance-enhancing properties. These effects make it a fascinating compound for researchers studying athletic performance, metabolic disorders, and body composition.

Unparalleled Endurance Enhancement

Perhaps the most celebrated benefit of Cardarine is its profound impact on endurance. Studies have consistently shown that GW 501516 can dramatically improve aerobic capacity and stamina. This is attributed to several factors:

• Increased Oxygen Utilization: By promoting mitochondrial biogenesis and enhancing fatty acid oxidation, Cardarine allows muscles to utilize oxygen more efficiently, leading to a significant boost in aerobic endurance. Test subjects often report a noticeable increase in their ability to perform prolonged cardiovascular activities without fatigue.
• Glycogen Sparing: As the body shifts to burning fat for fuel, glycogen stores in the muscles are preserved. This delays the onset of fatigue, often referred to as "hitting the wall," allowing for longer, more intense training sessions.
• Faster Recovery: Enhanced metabolic efficiency and reduced reliance on glycogen can also contribute to quicker recovery times between workouts, enabling researchers to push their training frequency and intensity.

For those conducting research on endurance, compounds like Gw 501516 60 caps or GW 501516 cardarine 30 ml offer an excellent opportunity to explore these effects.

Significant Fat Loss and Body Composition Improvement

GW 501516’s role as a potent fat burner is another key area of interest. By activating PPAR-delta, it promotes the breakdown of stored fat for energy, even in the absence of a strict caloric deficit. This makes it a valuable research tool for understanding obesity and metabolic syndrome.

• Enhanced Fatty Acid Oxidation: The primary mechanism here is the increased rate at which the body oxidizes fat. This leads to a reduction in adipose tissue, contributing to a leaner physique.
• Preservation of Muscle Mass: Unlike traditional cutting methods that can lead to muscle loss alongside fat loss, Cardarine helps preserve lean muscle tissue. By favoring fat as fuel, it spares muscle protein from being catabolized for energy, which is crucial for maintaining strength and performance during a cutting phase.
• Reduced Fat Storage: Some research suggests Cardarine may also inhibit lipogenesis (the formation of new fat cells) and reduce the storage of triglycerides in adipose tissue, further contributing to a more favorable body composition.

Potential for Cardiovascular Health Implications

Beyond performance and body composition, early research also indicated potential benefits for cardiovascular health, particularly in animal models:

• Improved Lipid Profiles: Studies have shown that GW 501516 can improve cholesterol levels by increasing high-density lipoprotein (HDL, "good" cholesterol) and decreasing low-density lipoprotein (LDL, "bad" cholesterol) and triglycerides.
• Anti-inflammatory Effects: There is evidence to suggest that Cardarine may exert anti-inflammatory effects on vascular tissue, potentially contributing to healthier arteries.

It’s important to note that while these findings are promising, extensive human research is still needed to fully understand the long-term cardiovascular effects of GW 501516. However, its impact on metabolic pathways clearly positions it as a compound with broad research potential.

GW 501516 Dosage and Administration for Research

For researchers conducting studies with GW 501516, understanding appropriate dosages and administration protocols is crucial for obtaining reliable data and ensuring responsible research practices. It is imperative to remember that these guidelines are based on existing research and anecdotal reports from the research community, and strict adherence to ethical research standards is paramount.

Typical Research Dosages

The most commonly cited research dosages for GW 501516 typically fall within the range of 10mg to 20mg per day. However, some research protocols have explored dosages as low as 5mg and as high as 30mg, depending on the specific objectives of the study:

• 10mg per day: This is often considered a good starting point for researchers, particularly for those new to working with the compound. At this dose, subjects may experience noticeable improvements in endurance and fat oxidation, while allowing for observation of individual responses. Products like Lawless Endurabol GW 501516 10 mg 90 caps are precisely dosed for convenience.
• 20mg per day: Many researchers opt for this dosage to maximize the effects on endurance and fat loss. Studies suggest that 20mg daily provides a more pronounced impact, with many users reporting significant enhancements in stamina and body composition changes.
• 5mg per day: While less common for pronounced effects, some researchers may use this lower dose for initial observations or when combining Cardarine with other compounds in a stack.

It’s generally advised not to exceed 20mg per day for extended periods in research settings, as higher doses do not necessarily translate to proportionally greater benefits and may increase the likelihood of observing adverse effects.

Administration Timing and Half-Life

GW 501516 has a relatively long half-life, estimated to be between 16 to 24 hours. This means that a single daily dose is sufficient to maintain stable blood plasma levels. Researchers typically administer the full daily dose once in the morning, or approximately 30-60 minutes before a training session to potentially maximize its acute performance-enhancing effects. However, due to its long half-life, the exact timing within the day may not be as critical as with compounds requiring multiple daily administrations.

Research Cycle Length

Research cycles for GW 501516 typically range from 8 to 12 weeks. An 8-week cycle is often recommended for initial studies, allowing sufficient time to observe significant effects without prolonged exposure. Longer cycles, up to 12 weeks, may be employed for more in-depth research into long-term metabolic adaptations. After a cycle, a break of at least 4-8 weeks is generally advised to allow the body to return to baseline and to minimize any potential tolerance or desensitization to the compound.

Forms of GW 501516

GW 501516 is available in various forms for research purposes:

• Liquid Solutions: These are popular for their ease of dosage adjustment. Products like GW 501516 cardarine 30 ml offer precise liquid measurement for research.
• Capsules: Capsules provide a convenient and precise pre-dosed option, such as Gw 501516 60 caps or Lawless Endurabol GW 501516 10 mg 90 caps, simplifying administration in research settings.

Regardless of the form, it is crucial to source GW 501516 from reputable suppliers like PureSuppl to ensure the purity and authenticity of the research compound.

Potential Side Effects and Safety Considerations in Research

The safety profile of GW 501516 is a topic of significant discussion within the research community, largely due to a highly publicized animal study. It is critical for researchers to understand the context and implications of these findings to conduct responsible and ethical studies.

The "Cancer Scare" Controversy

The primary concern regarding GW 501516’s safety stems from a 2007 study conducted by GlaxoSmithKline. In this study, rats were administered extremely high doses of Cardarine (equivalent to hundreds of milligrams in humans) over a prolonged period (up to 2 years). The results indicated that these high doses led to the development of various types of tumors in multiple organs of the rats.

It is crucial to contextualize these findings:

• Extreme Dosing: The dosages used in the rat study were far beyond what would be considered for human research, often 50-100 times higher on a per-kilogram basis than typical research dosages.
• Species-Specific Differences: Rats metabolize compounds differently than humans. PPAR-delta activation, while beneficial in humans at appropriate levels, might have different effects or thresholds for carcinogenicity in rodents.
• Duration of Exposure: The rats were exposed to these high doses for nearly their entire lifespan, which is not comparable to the typical 8-12 week research cycles observed in human studies.

While the rat study warrants caution and highlights the need for continued research, many in the scientific community argue that these findings cannot be directly extrapolated to human use at typical research dosages and durations. There is currently no conclusive evidence from human research studies or anecdotal reports of cancer development in individuals using GW 501516 at commonly researched doses for typical cycle lengths.

Lack of Long-Term Human Studies

Despite the promising short-term benefits observed in research, the lack of extensive, long-term human clinical trials for GW 501516 means that its full safety profile, particularly concerning prolonged use, remains largely unknown. This is a common challenge with many research chemicals that do not progress to full pharmaceutical development.

Other Potential Considerations (Anecdotal/Theoretical)

While generally well-tolerated in research, some anecdotal reports have mentioned:

• Headaches: Mild headaches are occasionally reported, often at higher dosages.
• Nausea: Some individuals may experience mild gastrointestinal discomfort.
• Liver Enzymes: While Cardarine is not known to be hepatotoxic, it’s always prudent to monitor liver enzyme levels during any research involving metabolic compounds.

Importance of Responsible Research Practices

For any researcher considering GW 501516, the following principles are paramount:

• Adhere to Recommended Dosages: Never exceed established research dosages.
• Limit Cycle Lengths: Stick to recommended cycle durations (8-12 weeks) and incorporate breaks.
• Source Purity: Obtain GW 501516 from reputable suppliers like PureSuppl to ensure the compound’s purity and avoid contaminants that could introduce unforeseen risks.
• Monitor and Document: Thoroughly document all observations and monitor any potential adverse effects.
• Consult Professionals: Always consult with qualified medical or scientific professionals before initiating any research involving novel compounds.

In conclusion, while the rat study raised significant red flags, the context of extreme dosing is critical. Current human research and anecdotal evidence at typical dosages do not mirror the severe outcomes observed in rats. However, the scientific community emphasizes caution and responsible research due to the ongoing need for comprehensive long-term human data.

GW 501516 Stacking Options for Enhanced Research Outcomes

For researchers looking to explore synergistic effects and optimize specific outcomes, GW 501516 is often incorporated into research stacks with other compounds. Its unique metabolic action makes it a versatile addition, complementing various research goals.

Stacking for Endurance and Cutting

When the primary research objective is to maximize endurance and facilitate fat loss while preserving lean mass, Cardarine shines in combination with other compounds:

• GW 501516 with SR9009 (Stenabolic): This combination is highly favored for its potent impact on metabolic function and endurance. Both compounds enhance mitochondrial function and fatty acid oxidation through different pathways, leading to a synergistic effect. SR9009, a Rev-ErbA agonist, also improves metabolic rate and endurance. The combination can lead to unparalleled stamina and accelerated fat loss. For researchers interested in this powerful duo, Bio-Gen GSX-R (GW+SR9009) 60 ml offers a convenient pre-formulated option.
• GW 501516 with SARMs (e.g., Ostarine, LGD-4033, S4): For body recomposition research, stacking Cardarine with SARMs can yield impressive results. SARMs like Ostarine (MK-2866) or LGD-4033 (Ligandrol) are known for their muscle-building and muscle-preserving properties. When combined with Cardarine, researchers can investigate how to simultaneously build or maintain lean muscle mass while aggressively shedding body fat and significantly boosting endurance. This creates a highly anabolic and fat-burning environment, ideal for cutting cycles in research models.

Stacking for Bulking (Minimizing Fat Gain)

While primarily associated with cutting and endurance, Cardarine can also play a valuable role in research focused on bulking phases:

• GW 501516 with Bulking Agents: During a caloric surplus, the risk of unwanted fat gain increases. By incorporating Cardarine into a bulking stack (e.g., with more potent SARMs or even traditional anabolics in animal models), researchers can investigate its ability to mitigate fat accumulation. Cardarine’s metabolic reprogramming helps the body efficiently utilize calories, directing them towards muscle growth rather than fat storage. It also maintains cardiovascular health and endurance, which can sometimes be compromised during heavy bulking phases.

General Considerations for Stacking

• Dosage Adjustment: When stacking multiple compounds, it’s often advisable to start with lower dosages of each to assess tolerance and synergistic effects.
• Cycle Lengths: Ensure that the cycle lengths of stacked compounds are compatible and that appropriate breaks are taken.
• Monitoring: Comprehensive monitoring of subjects is even more critical when stacking to identify any potential interactions or increased side effects.

The strategic combination of GW 501516 with other research compounds opens up new avenues for exploring advanced performance enhancement and body composition modulation, providing a richer data set for scientific inquiry.

GW 501516 vs. SR9009: A Comparative Look at Endurance Enhancers

While both GW 501516 (Cardarine) and SR9009 (Stenabolic) are highly regarded in the research community for their ability to enhance endurance and metabolic function, they operate through distinct mechanisms. Understanding these differences is key for researchers to select the most appropriate compound for their specific study objectives or to design effective stacks.

GW 501516 (Cardarine): The PPAR-delta Agonist

• Mechanism: Cardarine is a PPAR-delta agonist. It directly activates the PPAR-delta pathway, leading to increased expression of genes involved in fatty acid oxidation, mitochondrial biogenesis, and glucose uptake.
• Primary Effects: Its main effects are a significant increase in endurance, enhanced fat oxidation (leading to fat loss and muscle preservation), and improved lipid profiles. It essentially reprograms the body to burn fat for fuel more efficiently.
• Half-life: Has a relatively long half-life of 16-24 hours, allowing for once-daily dosing.
• Application: Ideal for long-duration endurance activities, sustained fat loss, and improving overall metabolic efficiency.

SR9009 (Stenabolic): The Rev-ErbA Agonist

• Mechanism: SR9009 is a Rev-ErbA alpha agonist. It binds to and activates the Rev-ErbA protein, which plays a crucial role in regulating circadian rhythms and metabolism. By activating Rev-ErbA, SR9009 influences the expression of genes involved in glucose and lipid metabolism, mitochondrial function, and inflammation.
• Primary Effects: SR9009 boosts metabolic rate, increases mitochondrial content, enhances endurance, and reduces fat storage. It can also improve cholesterol levels and reduce inflammation.
• Half-life: Has a very short half-life, estimated to be around 4 hours. This typically necessitates multiple daily doses (3-4 times a day) in research to maintain stable blood levels and maximize its effects.
• Application: Due to its short half-life, SR9009 is often researched for its potential acute effects on metabolic rate and endurance, making it suitable for studies requiring sustained activity throughout the day with frequent dosing.

Synergistic Stacking: The Best of Both Worlds

Given their distinct yet complementary mechanisms, GW 501516 and SR9009 are often stacked together in research to achieve a synergistic effect. Cardarine provides the sustained, long-term metabolic reprogramming and endurance boost, while SR9009 offers a continuous metabolic uplift throughout the day due to its more frequent administration schedule.

This combination can lead to:

• Maximized Endurance: By targeting different pathways that both enhance mitochondrial function and energy utilization, the stack can deliver an unparalleled boost in stamina.
• Accelerated Fat Loss: Both compounds promote fat oxidation, and their combined action can lead to more rapid and efficient reduction of adipose tissue.
• Improved Metabolic Health: The dual action on lipid and glucose metabolism can result in superior improvements in metabolic parameters.

For researchers interested in exploring the combined power of these two compounds, products like Bio-Gen GSX-R (GW+SR9009) 60 ml offer a convenient solution for integrated research protocols.

In summary, while both GW 501516 and SR9009 are potent metabolic enhancers, their differing mechanisms and half-lives make them unique. Researchers can choose between them based on specific study designs or combine them to investigate a broader, more profound impact on endurance and metabolic function.

Legal Status and Research Guidelines

The legal status of GW 501516 is an important consideration for researchers and institutions. Due to its history and the nature of its development, Cardarine occupies a specific regulatory niche.

Research Chemical Status

In many countries, including the United States, GW 501516 is classified as a "research chemical." This means it is not approved for human consumption or therapeutic use by regulatory bodies like the FDA. Instead, it is legally sold and purchased solely for legitimate scientific research purposes, such as in vitro (test tube) or in vivo (animal) studies, and not for direct human application. This distinction is critical and is often emphasized by reputable suppliers like PureSuppl, who clearly state that their products are "for research use only."

Anti-Doping Regulations

Despite its research chemical status, GW 501516 is explicitly prohibited by major sports anti-doping organizations, including the World Anti-Doping Agency (WADA). It is listed under the category of "Hormone and Metabolic Modulators." Athletes who use Cardarine risk severe sanctions, including bans from competition. This prohibition underscores its potent performance-enhancing effects, even if it is not approved for human use.

Importance of Responsible Sourcing

Given its research chemical status, the quality and purity of GW 501516 can vary significantly between suppliers. It is paramount for researchers to source their compounds from reputable vendors who provide third-party testing and certificates of analysis (COAs) to verify product purity and concentration. This ensures that the research being conducted is based on a legitimate and unadulterated compound, thereby leading to reliable and reproducible results. PureSuppl is committed to providing high-quality research chemicals, including Gw 501516 60 caps and GW 501516 cardarine 30 ml, for scientific inquiry.

Ethical Research Conduct

For any individual or institution engaging in research with GW 501516, adherence to ethical guidelines is non-negotiable. This includes:

• Informed Consent: If any human trials are considered (though GW 501516 is not approved for human use), strict ethical protocols for informed consent must be followed.
• Institutional Review Boards (IRBs): All research involving human or animal subjects must be approved by an appropriate ethics committee or IRB.
• Documentation: Meticulous record-keeping of experimental protocols, observations, and outcomes is essential.

The legal and ethical framework surrounding research chemicals like GW 501516 demands diligence and responsibility. While its potential benefits for scientific understanding are vast, these must always be pursued within the bounds of established legal and ethical research practices.

The Future of GW 501516 in Research

The journey of GW 501516 from a promising pharmaceutical candidate to a widely recognized research chemical is a testament to its compelling biological activity. While its path to a marketed drug was halted due to safety concerns in high-dose animal studies, its fundamental mechanisms of action continue to fascinate and motivate scientific inquiry.

Ongoing Research Avenues

Despite the past setbacks, Cardarine remains a subject of interest in various research domains:

• Metabolic Disorders: Researchers continue to explore PPAR-delta agonists for their potential in understanding and treating conditions like obesity, type 2 diabetes, and dyslipidemia. GW 501516 offers a valuable tool for studying the intricate pathways involved in energy metabolism and insulin sensitivity.
• Endurance and Performance Science: Its profound effects on stamina and fat utilization make it a cornerstone for studies investigating mechanisms of athletic performance enhancement, muscle fatigue, and recovery. Understanding how Cardarine promotes mitochondrial biogenesis and shifts fuel preference could lead to new insights into optimizing human athletic potential.
• Neuroprotection: Emerging research is beginning to explore the potential neuroprotective effects of PPAR-delta agonists, including Cardarine, in models of neurodegenerative diseases. This opens up entirely new avenues for scientific investigation beyond its traditional metabolic applications.
• Anti-inflammatory Properties: The anti-inflammatory effects observed in some studies suggest further research into its role in chronic inflammatory conditions.

The Role of Responsible Research

The future utility of GW 501516 largely depends on continued, responsible research. This means:

• Rigorous Study Design: Conducting well-designed studies with appropriate dosages and durations to further elucidate its safety and efficacy profile in various models.
• Understanding Human Specificity: More research is needed to understand species-specific differences in response to PPAR-delta activation and to determine if the high-dose animal findings are truly relevant to human physiology at typical research doses.
• Exploring Novel Applications: Moving beyond performance enhancement to explore its broader therapeutic potential in areas such as cardiovascular health, neurobiology, and inflammatory diseases.

Compounds like Lawless Endurabol GW 501516 10 mg 90 caps and Bio-Gen GSX-R (GW+SR9009) 60 ml continue to be vital tools for researchers in these fields.

In conclusion, while GW 501516 may never reach the market as a pharmaceutical drug for human use, its scientific value as a research chemical is undeniable. It provides a powerful lens through which to study fundamental metabolic processes, and its continued investigation promises to yield valuable insights into human physiology, disease, and performance.

Conclusion: GW 501516 – A Catalyst for Research in Endurance and Metabolism

GW 501516, or Cardarine, stands as a testament to the intricate complexities of metabolic science and the ongoing quest for enhanced human potential. As a potent PPAR-delta agonist, it has unequivocally demonstrated in numerous research settings its capacity to significantly boost endurance, accelerate fat oxidation, preserve lean muscle mass, and improve various markers of metabolic health.

For fitness researchers, bodybuilders, and athletes, the scientific exploration of Cardarine offers invaluable insights into optimizing physical performance and body composition. Its unique mechanism, distinct from SARMs and anabolic steroids, positions it as a fascinating compound for understanding energy utilization at a cellular level. Whether used individually or synergistically in research stacks with compounds like SR9009, GW 501516 provides a robust platform for investigating advanced metabolic modulation.

While the historical "cancer scare" in high-dose animal studies necessitates caution and underscores the importance of responsible research practices, the current body of evidence from human research settings and anecdotal reports at typical dosages does not reflect these severe outcomes. Nevertheless, the call for continued, rigorous, long-term human studies remains paramount to fully elucidate its safety profile.

As a research chemical, GW 501516 continues to be a vital tool for scientific inquiry into metabolic disorders, athletic performance, and beyond. Its future in science promises to unravel further complexities of human physiology, offering new avenues for understanding and potentially addressing some of the most pressing health and performance challenges. Researchers must always adhere to ethical guidelines, proper dosing protocols, and ensure sourcing from reputable suppliers like PureSuppl to ensure the integrity and safety of their studies.

By delving into the science of GW 501516, we gain a deeper appreciation for the nuanced interplay of biological pathways that govern our energy, stamina, and physical form, pushing the boundaries of what is understood about human capability.

Disclaimer: This article is for educational and research purposes only. It does not constitute medical advice. Always consult a qualified healthcare professional. PureSuppl sells these products for research purposes only.