Bades: risks and benefits

Section 1: Defining Dietary Supplements – A Regulatory Landscape

Dietary supplements, or БАДы (Biologicheski Aktivnye Dobavki – Biologically Active Additives) in Russian, represent a diverse category of products intended to supplement the diet. Understanding their precise definition and the regulatory framework governing their manufacture, marketing, and sale is crucial before delving into the potential risks and benefits. The ambiguity surrounding their classification often contributes to consumer confusion and necessitates a thorough examination of the legal landscape.

  1. What Constitutes a Dietary Supplement? In essence, a dietary supplement is a product taken orally that contains one or more dietary ingredients intended to supplement the diet. These “dietary ingredients” can include vitamins, minerals, herbs or other botanicals, amino acids, and other substances such as enzymes, organ tissues, glandulars, and metabolites. Supplements can be found in various forms, including tablets, capsules, powders, softgels, gelcaps, and liquids. They are often marketed as a convenient way to address nutritional deficiencies, enhance athletic performance, promote weight loss, or support overall health. However, it is vital to remember that dietary supplements are not intended to diagnose, treat, cure, or prevent any disease. This distinction is critical and frequently blurred in marketing materials.

  2. The Regulatory Framework in Russia (and Globally): In Russia, the regulation of dietary supplements falls under the jurisdiction of Rospotrebnadzor (Federal Service for Surveillance on Consumer Rights Protection and Human Wellbeing). This agency is responsible for ensuring that supplements meet safety and quality standards before they can be sold to consumers. Manufacturers are required to notify Rospotrebnadzor of their intent to market a new supplement and provide documentation supporting its safety and composition. While this provides a level of oversight, the regulations are often less stringent than those applied to pharmaceuticals.

    Globally, the regulatory landscape varies significantly. In the United States, for example, dietary supplements are regulated under the Dietary Supplement Health and Education Act (DSHEA) of 1994. This act places the primary responsibility for ensuring the safety of dietary supplements on the manufacturer. The FDA (Food and Drug Administration) does not approve supplements before they are marketed; however, it can take action against products that are found to be unsafe or misbranded. In Europe, regulations are harmonized to some extent through the European Food Safety Authority (EFSA), but individual member states still have some authority over supplement regulation. Understanding these jurisdictional differences is crucial when considering the safety and quality of supplements sourced from various countries.

  3. Distinguishing Supplements from Pharmaceuticals: The key difference lies in the level of scrutiny and testing required before market entry. Pharmaceuticals undergo rigorous clinical trials to demonstrate their safety and efficacy for specific medical conditions. These trials are typically double-blind, placebo-controlled, and involve large numbers of participants. Dietary supplements, on the other hand, are not subject to the same level of testing. Manufacturers are not required to prove that their supplements are effective for their intended use before they are sold. This lack of pre-market approval means that consumers must rely on the manufacturer’s claims and independent research to determine the potential benefits and risks of a particular supplement.

  4. The Importance of Third-Party Certification: Given the limitations of regulatory oversight, third-party certification programs play a crucial role in ensuring the quality and safety of dietary supplements. Organizations like NSF International, USP (United States Pharmacopeia), and ConsumerLab.com independently test supplements to verify that they contain the ingredients listed on the label, at the declared potency, and that they are free from harmful contaminants such as heavy metals, pesticides, and bacteria. Choosing supplements that have been certified by a reputable third-party organization can provide consumers with greater confidence in the product’s quality and safety.

  5. Common Misconceptions and Marketing Tactics: The supplement industry is rife with misleading marketing claims and unsubstantiated promises. Consumers are often bombarded with advertisements that tout the benefits of supplements for weight loss, muscle gain, energy enhancement, and disease prevention. It is essential to approach these claims with skepticism and to critically evaluate the evidence supporting them. Phrases like “clinically proven” or “scientifically formulated” can be misleading if the studies cited are poorly designed, have a small sample size, or are funded by the manufacturer. Furthermore, many supplements are marketed using testimonials and anecdotal evidence, which are not reliable indicators of efficacy. Consumers should always consult with a healthcare professional before taking any dietary supplement, especially if they have underlying medical conditions or are taking other medications.

Section 2: Potential Benefits of Dietary Supplements – Evidence-Based Applications

While skepticism is warranted, certain dietary supplements, when used appropriately and under the guidance of a healthcare professional, can offer genuine health benefits. This section explores the evidence-based applications of specific supplements, focusing on those with robust scientific backing and clearly defined uses.

  1. Vitamin D for Bone Health and Beyond: Vitamin D plays a crucial role in calcium absorption and bone health. Deficiency is widespread, particularly in northern latitudes and among individuals with limited sun exposure. Supplementation can help prevent rickets in children and osteomalacia and osteoporosis in adults. Emerging research also suggests potential benefits for immune function, cardiovascular health, and mood regulation, although more studies are needed to confirm these findings. The recommended daily intake varies depending on age and individual needs, but many experts recommend a daily dose of 600-800 IU (International Units) for adults.

  2. Folic Acid for Pregnancy and Neural Tube Defects: Folic acid, a B vitamin, is essential for cell growth and development. Supplementation during pregnancy is critical for preventing neural tube defects in the developing fetus, such as spina bifida. The recommended daily intake for women of childbearing age is 400 mcg (micrograms), and pregnant women should increase their intake to 600 mcg. Fortification of foods with folic acid has significantly reduced the incidence of neural tube defects in many countries.

  3. Omega-3 Fatty Acids for Cardiovascular Health: Omega-3 fatty acids, particularly EPA (eicosapentaenoic acid) and DHA (docosahexaenoic acid), are found in fatty fish and fish oil supplements. Numerous studies have shown that omega-3s can reduce triglyceride levels, lower blood pressure, and decrease the risk of heart disease. They also have anti-inflammatory properties and may benefit brain health and cognitive function. The American Heart Association recommends consuming at least two servings of fatty fish per week, or supplementing with 1-2 grams of EPA and DHA per day.

  4. Calcium for Bone Health and Muscle Function: Calcium is essential for building and maintaining strong bones and teeth. It also plays a role in muscle function, nerve transmission, and blood clotting. Supplementation may be necessary for individuals who do not consume enough calcium through their diet, such as those with lactose intolerance or who follow vegan diets. The recommended daily intake varies depending on age and gender, but adults typically need around 1000-1200 mg per day. It’s crucial to consume calcium with vitamin D for optimal absorption.

  5. Iron for Anemia and Energy Levels: Iron is a component of hemoglobin, the protein in red blood cells that carries oxygen throughout the body. Iron deficiency can lead to anemia, characterized by fatigue, weakness, and shortness of breath. Iron supplementation is often recommended for individuals with iron deficiency anemia, pregnant women, and those with heavy menstrual bleeding. However, iron supplements can cause gastrointestinal side effects, such as constipation, so it’s important to take them with food and to follow a healthcare professional’s guidance.

  6. Probiotics for Gut Health and Immunity: Probiotics are live microorganisms that can benefit the digestive system. They are found in fermented foods like yogurt and sauerkraut, as well as in supplement form. Probiotics can help restore the balance of gut bacteria, improve digestion, and boost the immune system. They may be particularly helpful for individuals with irritable bowel syndrome (IBS), antibiotic-associated diarrhea, or other digestive disorders. However, not all probiotics are created equal, and it’s important to choose a product that contains strains that have been shown to be effective for your specific needs.

  7. Creatine for Muscle Strength and Performance: Creatine is a naturally occurring compound that helps supply energy to muscles. It is commonly used by athletes to improve muscle strength, power, and performance. Creatine supplementation has been shown to increase muscle mass, enhance exercise capacity, and reduce muscle fatigue. It is generally considered safe for healthy individuals when taken at recommended doses.

  8. Melatonin for Sleep Disorders: Melatonin is a hormone that regulates the sleep-wake cycle. Supplementation can help improve sleep quality and reduce the time it takes to fall asleep, particularly for individuals with jet lag, shift work sleep disorder, or insomnia. Melatonin is generally considered safe for short-term use, but long-term effects are not well-known.

  9. Magnesium for Muscle Function and Nerve Health: Magnesium is involved in over 300 biochemical reactions in the body. It plays a role in muscle function, nerve transmission, blood sugar control, and blood pressure regulation. Magnesium deficiency can lead to muscle cramps, fatigue, and irregular heartbeat. Supplementation may be beneficial for individuals with magnesium deficiency, as well as those with migraines, premenstrual syndrome (PMS), and type 2 diabetes.

  10. Zinc for Immune Function and Wound Healing: Zinc is an essential mineral that supports immune function, wound healing, and cell growth. Zinc deficiency can impair immune function and increase the risk of infections. Supplementation may be beneficial for individuals with zinc deficiency, as well as those with colds, wounds, or age-related macular degeneration.

Section 3: Potential Risks and Side Effects of Dietary Supplements – A Critical Evaluation

Despite the potential benefits, dietary supplements are not without risks. This section examines the potential adverse effects, interactions with medications, and other safety concerns associated with supplement use. Understanding these risks is crucial for making informed decisions about whether or not to take a particular supplement.

  1. Adverse Reactions and Side Effects: Many dietary supplements can cause side effects, ranging from mild gastrointestinal discomfort to more serious health problems. Common side effects include nausea, vomiting, diarrhea, constipation, abdominal pain, and heartburn. Some supplements can also cause headaches, dizziness, insomnia, and anxiety. In rare cases, supplements can cause liver damage, kidney damage, or other organ dysfunction. The risk of side effects is higher with high doses, long-term use, and in individuals with underlying medical conditions.

  2. Interactions with Medications: Dietary supplements can interact with prescription and over-the-counter medications, potentially altering their effectiveness or increasing the risk of side effects. For example, St. John’s wort, a popular herbal supplement used for depression, can interact with many medications, including antidepressants, birth control pills, and blood thinners. Vitamin K can interfere with the action of warfarin, a blood thinner. Grapefruit juice can interact with a variety of medications, including statins, calcium channel blockers, and antihistamines. It is crucial to inform your healthcare provider about all the supplements you are taking, as well as any medications you are taking, to avoid potentially dangerous interactions.

  3. Contamination and Adulteration: Dietary supplements are not always manufactured to the same standards as pharmaceuticals, and they can be subject to contamination and adulteration. Contamination can occur during the manufacturing process, leading to the presence of heavy metals, pesticides, bacteria, or other harmful substances in the supplement. Adulteration involves the intentional addition of undeclared ingredients, such as prescription drugs or synthetic compounds, to the supplement. This can pose serious health risks to consumers. For example, some weight loss supplements have been found to contain sibutramine, a prescription drug that was banned due to its cardiovascular side effects.

  4. Lack of Quality Control: The lack of stringent quality control in the supplement industry is a major concern. Many supplements are not tested for purity, potency, or identity, which means that consumers may not be getting what they think they are getting. The amount of the active ingredient in a supplement may vary from batch to batch, and some supplements may not contain any of the active ingredient at all. This lack of quality control makes it difficult for consumers to make informed choices about which supplements to take.

  5. Overdose and Toxicity: Taking too much of certain dietary supplements can lead to overdose and toxicity. For example, taking too much vitamin A can cause liver damage, hair loss, and birth defects. Taking too much iron can cause gastrointestinal problems, liver damage, and even death. It is important to follow the recommended dosage guidelines on the supplement label and to consult with a healthcare professional before taking high doses of any supplement.

  6. False Advertising and Misleading Claims: The supplement industry is notorious for making unsubstantiated claims about the benefits of their products. Many supplements are marketed as cures for diseases or as ways to improve athletic performance, without any scientific evidence to support these claims. Consumers should be wary of any supplement that promises miracle cures or guarantees results. It is important to critically evaluate the evidence supporting the claims made by supplement manufacturers and to consult with a healthcare professional before taking any supplement.

  7. Risk of Allergic Reactions: Some individuals may be allergic to certain ingredients in dietary supplements, such as herbs, plants, or other substances. Allergic reactions can range from mild skin rashes to severe anaphylaxis, a life-threatening condition that can cause difficulty breathing, swelling of the throat, and loss of consciousness. It is important to read the ingredient list carefully before taking any supplement and to be aware of any potential allergens. If you experience any symptoms of an allergic reaction, such as hives, itching, swelling, or difficulty breathing, seek medical attention immediately.

  8. Impact on Surgical Procedures: Certain dietary supplements can increase the risk of bleeding during or after surgical procedures. For example, garlic, ginger, ginkgo biloba, and vitamin E can all thin the blood and increase the risk of bleeding. It is important to inform your surgeon about all the supplements you are taking before undergoing any surgical procedure. Your surgeon may advise you to stop taking certain supplements for a period of time before the surgery.

  9. Potential for Dependency: While not physically addictive in the same way as drugs or alcohol, some individuals may develop a psychological dependency on dietary supplements. This can occur when people believe that they need supplements to function properly or to achieve their health goals. This dependency can lead to excessive supplement use and may interfere with other healthy behaviors, such as eating a balanced diet and exercising regularly.

  10. Increased Risk for Vulnerable Populations: Certain populations are at increased risk of experiencing adverse effects from dietary supplements. These include pregnant women, breastfeeding women, children, older adults, and individuals with chronic health conditions. Pregnant women should be particularly cautious about taking supplements, as some supplements can harm the developing fetus. Children are more susceptible to the toxic effects of supplements due to their smaller body size. Older adults may be more likely to experience side effects from supplements due to age-related changes in metabolism and organ function. Individuals with chronic health conditions may have a higher risk of supplement interactions with their medications.

Section 4: Making Informed Choices – A Guide to Responsible Supplement Use

Navigating the world of dietary supplements requires a discerning approach. This section provides practical guidance on how to make informed choices, minimize risks, and maximize potential benefits. Emphasis is placed on evidence-based decision-making, consulting with healthcare professionals, and understanding the importance of a holistic approach to health.

  1. Consult with a Healthcare Professional: The most crucial step in making informed choices about dietary supplements is to consult with a healthcare professional, such as a doctor, registered dietitian, or pharmacist. These professionals can assess your individual needs, evaluate your current health status, and determine whether or not a particular supplement is appropriate for you. They can also help you choose a safe and effective supplement, recommend the appropriate dosage, and monitor for any potential side effects or interactions.

  2. Research the Supplement: Before taking any dietary supplement, it is important to do your research. Look for information from reputable sources, such as government agencies, medical organizations, and scientific journals. Be wary of claims that seem too good to be true, and be skeptical of testimonials and anecdotal evidence. Look for studies that have been published in peer-reviewed journals and that have been conducted on a large number of participants.

  3. Read the Label Carefully: Always read the label carefully before taking any dietary supplement. Pay attention to the list of ingredients, the dosage instructions, and any warnings or precautions. Be aware of any potential allergens or ingredients that you may be sensitive to. Look for supplements that have been certified by a third-party organization, such as NSF International, USP, or ConsumerLab.com. This certification indicates that the supplement has been tested for purity, potency, and identity.

  4. Start with a Low Dose: When starting a new dietary supplement, it is always best to start with a low dose and gradually increase it as tolerated. This will help you to minimize the risk of side effects. Pay attention to how your body responds to the supplement, and stop taking it if you experience any adverse reactions.

  5. Be Aware of Potential Interactions: Dietary supplements can interact with prescription and over-the-counter medications, as well as with other supplements. Be sure to inform your healthcare provider about all the supplements you are taking, as well as any medications you are taking, to avoid potentially dangerous interactions.

  6. Consider Your Overall Diet: Dietary supplements should not be used as a substitute for a healthy diet. A balanced diet that is rich in fruits, vegetables, whole grains, and lean protein should provide you with most of the nutrients you need. Supplements can be helpful for filling in gaps in your diet, but they should not be relied upon as your primary source of nutrition.

  7. Be Realistic About Expectations: Dietary supplements are not miracle cures, and they are not guaranteed to produce the results that you are hoping for. Be realistic about your expectations, and do not expect supplements to solve all of your health problems. Supplements can be a helpful tool for supporting your health, but they should be used in conjunction with other healthy behaviors, such as eating a balanced diet, exercising regularly, and getting enough sleep.

  8. Choose Reputable Brands: The supplement industry is not well-regulated, and there are many unscrupulous companies that sell products that are ineffective or even dangerous. Choose supplements from reputable brands that have a long history of producing high-quality products. Look for brands that have been certified by a third-party organization.

  9. Report Adverse Events: If you experience any adverse events after taking a dietary supplement, report them to your healthcare provider and to the relevant regulatory agency. In Russia, this would be Rospotrebnadzor. Reporting adverse events can help to identify potential safety problems with supplements and can help to protect other consumers from harm.

  10. Prioritize a Holistic Approach: Dietary supplements are just one piece of the puzzle when it comes to maintaining good health. A holistic approach to health involves addressing all aspects of your well-being, including your physical, mental, and emotional health. This includes eating a healthy diet, exercising regularly, getting enough sleep, managing stress, and maintaining strong social connections. By prioritizing a holistic approach to health, you can improve your overall well-being and reduce your reliance on dietary supplements.

Section 5: Specific Supplement Profiles – In-Depth Analysis of Common БАДы

This section provides detailed profiles of several commonly used dietary supplements, examining their purported benefits, potential risks, and available scientific evidence. The goal is to offer a comprehensive overview of each supplement to aid in informed decision-making.

  1. Vitamin C (Ascorbic Acid): Vitamin C is an essential nutrient that acts as an antioxidant, supports immune function, and is involved in collagen synthesis. While it is widely believed to prevent colds, evidence suggests it may only slightly reduce the duration and severity of cold symptoms. High doses can cause gastrointestinal upset. Food sources are preferred.

  2. Echinacea: Echinacea is an herbal supplement often used to prevent or treat colds and other upper respiratory infections. However, the evidence supporting its effectiveness is mixed. Some studies have shown that it may shorten the duration of colds, while others have found no benefit. Echinacea can cause allergic reactions in some people.

  3. Garlic: Garlic is a culinary herb with a long history of medicinal use. It is believed to have antioxidant, anti-inflammatory, and antimicrobial properties. Some studies have shown that garlic may help lower blood pressure and cholesterol levels. However, more research is needed to confirm these benefits. Garlic can also interact with blood-thinning medications.

  4. Ginkgo Biloba: Ginkgo biloba is an herbal supplement often used to improve memory and cognitive function. However, the evidence supporting its effectiveness is inconsistent. Some studies have shown that ginkgo biloba may improve memory in people with age-related cognitive decline, while others have found no benefit. Ginkgo biloba can also interact with blood-thinning medications.

  5. St. John’s Wort: St. John’s wort is an herbal supplement used to treat depression. While some studies have shown that it can be effective for mild to moderate depression, it can also interact with many medications, including antidepressants, birth control pills, and blood thinners. St. John’s wort should only be used under the supervision of a healthcare professional.

  6. Milk Thistle: Milk thistle is an herbal supplement used to protect the liver from damage. Some studies have shown that milk thistle may improve liver function in people with liver diseases, such as cirrhosis and hepatitis. However, more research is needed to confirm these benefits. Milk thistle is generally considered safe, but it can cause mild gastrointestinal side effects.

  7. Saw Palmetto: Saw palmetto is an herbal supplement used to treat benign prostatic hyperplasia (BPH), or enlarged prostate. Some studies have shown that saw palmetto may improve urinary symptoms associated with BPH, such as frequent urination and difficulty urinating. However, the evidence supporting its effectiveness is mixed. Saw palmetto is generally considered safe, but it can cause mild gastrointestinal side effects.

  8. Glucosamine and Chondroitin: Glucosamine and chondroitin are supplements often used to treat osteoarthritis. Some studies have shown that they may reduce pain and improve joint function in people with osteoarthritis. However, the evidence supporting their effectiveness is mixed. Glucosamine and chondroitin are generally considered safe, but they can cause mild gastrointestinal side effects.

  9. Coenzyme Q10 (CoQ10): CoQ10 is an antioxidant that is involved in energy production. It is often used to treat heart failure, high blood pressure, and migraines. Some studies have shown that CoQ10 may improve symptoms of these conditions. However, more research is needed to confirm these benefits. CoQ10 is generally considered safe, but it can interact with blood-thinning medications.

  10. Turmeric/Curcumin: Turmeric is a spice that contains curcumin, a compound with antioxidant and anti-inflammatory properties. Curcumin supplements are often used to treat arthritis, inflammatory bowel disease, and other inflammatory conditions. Some studies have shown that curcumin may improve symptoms of these conditions. However, more research is needed to confirm these benefits. Curcumin is poorly absorbed by the body, so it is often combined with piperine (black pepper extract) to improve absorption.

Section 6: The Future of БАДы – Trends and Considerations

The dietary supplement industry is constantly evolving, with new products and ingredients emerging regularly. This section explores current trends and future considerations related to БАДы, focusing on areas like personalized nutrition, technological advancements, and the ongoing need for enhanced regulation.

  1. Personalized Nutrition and Supplements: The concept of personalized nutrition is gaining traction, driven by advancements in genetics, microbiome analysis, and wearable technology. This approach aims to tailor dietary recommendations, including supplement use, to an individual’s unique needs and characteristics. For example, genetic testing can identify individuals with a predisposition to certain nutrient deficiencies, allowing for targeted supplementation. Similarly, microbiome analysis can reveal imbalances in gut bacteria that may be addressed with specific probiotic strains. While personalized nutrition holds great promise, it is still in its early stages, and more research is needed to validate its effectiveness.

  2. Technological Advancements in Supplement Manufacturing: Technological advancements are transforming the way dietary supplements are manufactured. Novel extraction techniques, encapsulation methods, and delivery systems are being developed to improve the bioavailability and efficacy of supplements. For example, liposomal encapsulation can protect supplements from degradation in the digestive tract, allowing for better absorption. Nanotechnology is being used to create supplements with improved solubility and targeted delivery to specific tissues. These advancements have the potential to enhance the benefits of supplements, but they also raise new safety concerns that need to be carefully evaluated.

  3. The Role of Artificial Intelligence (AI): AI is playing an increasingly important role in the dietary supplement industry. AI algorithms can be used to analyze large datasets of scientific literature and clinical trial data to identify potential supplement benefits and risks. AI can also be used to personalize supplement recommendations based on an individual’s health profile and goals. Furthermore, AI-powered chatbots can provide consumers with personalized information and support regarding supplement use. However, it is important to ensure that AI algorithms are transparent, unbiased, and based on sound scientific evidence.

  4. Transparency and Traceability: Consumers are increasingly demanding greater transparency and traceability in the dietary supplement industry. They want to know where the ingredients in their supplements come from, how they are manufactured, and whether they have been tested for purity and potency. Blockchain technology can be used to create a transparent and secure supply chain for dietary supplements, allowing consumers to track the journey of their supplements from the farm to the store shelf.

  5. The Need for Enhanced Regulation: The dietary supplement industry is still relatively unregulated compared to the pharmaceutical industry. This lack of regulation allows unscrupulous companies to sell products that are ineffective or even dangerous. There is a growing consensus that enhanced regulation is needed to protect consumers from harm. This includes stricter manufacturing standards, more rigorous testing requirements, and stronger enforcement of existing regulations. International collaboration is also needed to harmonize supplement regulations across different countries.

  6. The Importance of Consumer Education: Consumer education is essential for empowering individuals to make informed choices about dietary supplements. Consumers need to be aware of the potential benefits and risks of supplements, how to read labels carefully, and where to find reliable information. Healthcare professionals also need to be educated about dietary supplements so that they can provide accurate and evidence-based advice to their patients.

  7. Sustainability and Ethical Sourcing: As consumers become more aware of the environmental and social impact of their purchasing decisions, there is growing demand for sustainably and ethically sourced dietary supplements. This includes ensuring that ingredients are harvested in an environmentally responsible manner, that workers are treated fairly, and that communities benefit from the production of supplements. Companies that prioritize sustainability and ethical sourcing are likely to gain a competitive advantage in the long run.

  8. The Future of Herbal Supplements: Herbal supplements have a long history of use in traditional medicine, and they continue to be popular among consumers. However, the quality and safety of herbal supplements can vary widely. In the future, we are likely to see more standardized herbal extracts with well-defined chemical profiles and improved bioavailability. There will also be a greater emphasis on rigorous scientific research to validate the efficacy and safety of herbal supplements.

  9. The Convergence of Supplements and Functional Foods: The line between dietary supplements and functional foods is becoming increasingly blurred. Functional foods are foods that have been enhanced with added nutrients or bioactive compounds to provide health benefits beyond basic nutrition. Examples of functional foods include fortified cereals, probiotic yogurts, and omega-3-enriched eggs. In the future, we are likely to see more products that combine the benefits of supplements and functional foods, offering consumers a convenient and effective way to improve their health.

  10. The Ongoing Debate About Efficacy: The debate about the efficacy of dietary supplements is likely to continue for the foreseeable future. Many supplements lack strong scientific evidence to support their purported benefits, and some supplements may even be harmful. It is important to approach supplement use with skepticism and to rely on evidence-based information when making decisions about which supplements to take. Ongoing research is needed to better understand the potential benefits and risks of dietary supplements.

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