Introduction
Tribulus terrestris is one of the most popular herbal supplements sold today, often marketed as a natural way to boost testosterone, improve athletic performance, and enhance libido. However, despite its widespread use in bodybuilding circles and wellness routines, the scientific evidence behind many of these claims is surprisingly thin. This evidence-based guide cuts through the marketing hype to explain what Tribulus terrestris is, what research actually says about its benefits, its potential side effects, and whether it deserves a place in your supplement regimen. You will learn about realistic expectations, safe dosing, and how this herb compares to other popular supplements.
What Is Tribulus terrestris?
Tribulus terrestris is a flowering plant belonging to the Zygophyllaceae family. It is known by several common names, including puncture vine, goathead, and caltrop. The plant is native to warm temperate and tropical regions across the world, including parts of southern Europe, Asia, Africa, and Australia. It thrives in dry, sandy soils and is often considered an invasive weed due to its hardiness and aggressive growth patterns.
The plant gets its "puncture vine" nickname from its distinctive woody fruits, which have sharp, spiny burrs that can puncture bicycle tires and injure livestock. The small, yellow flowers and the entire above-ground parts of the plant, particularly the leaves and fruits, are harvested for use in dietary supplements. While it may seem like an unassuming weed, Tribulus terrestris has a long history of use in traditional medicine systems, particularly in Ayurveda and traditional Chinese medicine.
In the supplement industry, the parts of the plant are typically dried and processed into powders, capsules, or liquid extracts. The key active compounds are believed to be a group of phytochemicals known as steroidal saponins, which have been the focus of much of the scientific research on this herb. It is important to distinguish the whole-plant extract used in supplements from the synthetic or isolated saponins studied in laboratories, as the effects can differ significantly.
Traditional and Current Uses
The history of Tribulus terrestris use spans thousands of years. In traditional Ayurvedic medicine, it has been used as a general health tonic, a diuretic to promote urine flow, and a remedy for painful urination, kidney stones, and inflammation. In traditional Chinese medicine, it has been employed to treat liver and eye problems, as well as high blood pressure. These traditional applications were based on observational evidence and have not always been confirmed by modern clinical trials.
In the late 20th century, the focus shifted dramatically to its use as a performance-enhancing and sexual health supplement. Bulgarian weightlifters reportedly used it in the 1970s and 1980s, which sparked international interest in its potential to increase natural testosterone levels. Today, Tribulus terrestris supplements are widely marketed to men for boosting libido, treating erectile dysfunction, enhancing muscle strength, and improving athletic performance. It is also marketed to women, though less commonly, for alleviating symptoms of menopause and increasing sexual desire.
This shift from a traditional diuretic to a modern "natural testosterone booster" represents a significant deviation. While the traditional uses have some preliminary scientific support, the modern marketing claims often outpace the clinical evidence, making it crucial to examine each purported benefit with a critical eye.
Evidence on Potential Health Benefits
To understand whether Tribulus terrestris is effective, it is helpful to look at the evidence for its most common uses individually. The overall picture is mixed, with the strongest evidence pointing toward sexual function in certain populations and the weakest evidence for the popular claims of athletic performance enhancement.
Tribulus and Testosterone Levels
The most pervasive claim is that Tribulus terrestris can significantly increase testosterone levels. This is the foundation of its popularity in the bodybuilding community. However, clinical research has largely failed to support this claim in healthy, young to middle-aged men. Several randomized controlled trials have shown that taking typical doses of Tribulus terrestris extract (ranging from 500 mg to 1500 mg per day) for 4 to 8 weeks does not increase total or free testosterone levels compared to a placebo in men with normal baseline hormone levels.
Some research has suggested a potential benefit in men with low testosterone, but this evidence is not robust. For example, one study found a significant increase in testosterone in men with hypoactive sexual desire, but this was a small study and the clinical significance is unclear. The consensus among exercise scientists and endocrinologists is that Tribulus terrestris is not a reliable method for increasing testosterone. This is a crucial point for consumers to understand, as marketing materials often imply a powerful hormonal effect that simply hasn't been proven in rigorous scientific settings.
Effects on Sexual Function and Libido
The evidence is slightly more promising for sexual function, particularly in individuals with clinically diagnosed issues. Some studies have investigated its use for erectile dysfunction (ED) and hypoactive sexual desire.
- Men with Low Sex Drive: A 2017 study in the World Journal of Men's Health found that a standardized Tribulus terrestris extract improved sexual function and desire in men with low libido, including an increase in testosterone and DHEA levels.
- Men with Erectile Dysfunction: Research suggests that Tribulus terrestris may improve erectile function in men with mild to moderate ED, potentially by supporting the relaxation of smooth muscle in the penis, which is necessary for an erection.
- Women: A small study on premenopausal women with hypoactive sexual desire disorder found that a Tribulus terrestris supplement improved sexual desire and satisfaction after a few months of use.
It is important to note that these results are not always replicated, and many studies on sexual function and sexual desire rely on self-reported questionnaires, which can be subjective. While the evidence is more promising than for testosterone, more high-quality research is still needed before it can be universally recommended for sexual health issues.
Tribulus for Athletic Performance and Bodybuilding
For athletes and bodybuilders, the goal is often to increase muscle strength, lean body mass, and overall exercise performance. The theoretical basis is that if Tribulus could increase testosterone, it would lead to these outcomes. Since the testosterone link has been largely disproven, the evidence for performance enhancement is also weak.
Most well-controlled studies on healthy, recreationally active men and athletes have shown no significant improvements in muscle strength, body composition, or aerobic capacity when supplementing with Tribulus terrestris. A 2007 study specifically examined this and found no beneficial effect on body composition and strength in a group of resistance-trained men.
Thus, while it may have subtle effects on libido, using Tribulus terrestris as a bodybuilding supplement is unsupported by current evidence. For this purpose, it is likely an ineffective use of money.
Other Potential Benefits
Beyond hormones and performance, research has explored other areas. These are often based on the plant's antioxidant and anti-inflammatory properties, which are attributed to its flavonoids and other compounds.
- Kidney Stones: Traditional use suggests Tribulus may help prevent or treat kidney stones. Some animal studies support this, showing it can alter urine composition in a way that reduces stone formation. However, human data is very limited, and it should not be used to self-treat kidney stones without medical supervision.
- Diabetes: Some preliminary research in animals indicates that Tribulus terrestris may help lower blood sugar levels and improve lipid profiles, potentially offering benefits for people with diabetes. This is a very early area of research, and no recommendations can be made for humans yet.
- Heart Health: There is some suggestion that it may have a mild blood pressure-lowering effect or help with cholesterol levels, but again, this evidence is far from conclusive and comes mostly from animal models or very small human studies.
It is essential to file these potential benefits under "area requiring further research," as the current data is insufficient to support their use for these conditions.
Evidence Summary Table
The table below provides a quick overview of the evidence level for the most common uses.
| Purported Use | Evidence Level | Verdict for Average Consumer |
|---|---|---|
| Testosterone Boosting | Weak / Contradictory | Unlikely to be effective in healthy men. |
| Improved Libido (Men) | Moderate / Mixed | May be helpful for some, but not all. |
| Improved Libido (Women) | Moderate / Limited data | Potential benefit for some, needs more research. |
| Erectile Dysfunction | Moderate / Mixed | May help mild ED, but not a first-line treatment. |
| Athletic Performance | Very Weak | Not recommended; no evidence of benefit. |
| Muscle Strength | Very Weak | Not recommended; no evidence of benefit. |
| Kidney Stones, Diabetes, Heart Health | Insufficient (Animal-based) | No recommendation can be made. |
How Tribulus Works: Phytochemicals and Mechanisms
To understand why Tribulus might have an effect in some cases but not others, it is helpful to look at its biological mechanisms. The primary active compounds are believed to be a diverse group of steroidal saponins, with protodioscin being the most studied. However, the plant also contains alkaloids, flavonoids, and other glycosides that contribute to its overall action.
The mechanism of action is complex and not fully understood. Saponins have a unique chemical structure that allows them to interact with cell membranes. Here is a breakdown of how these compounds are thought to work:
- Nitric Oxide and Blood Flow: Some research suggests that Tribulus terrestris may increase levels of nitric oxide in the body. Nitric oxide is a vasodilator, meaning it relaxes the inner muscles of blood vessels, causing them to widen and increasing blood flow. This mechanism is directly relevant to erectile function, as it facilitates the blood flow needed to achieve an erection. It could also explain potential benefits for blood pressure.
- Direct Action on Tissues: Rather than increasing systemic testosterone, some studies suggest that saponins may have a direct effect on tissues involved in sexual response, such as the corpus cavernosum of the penis, making them more sensitive to normal hormonal signals. This could improve function without changing overall serum testosterone levels.
- Neurotransmitter Interaction: There is preliminary evidence from animal models that Tribulus terrestris may influence the release of dopamine and other neurotransmitters in the brain that are associated with arousal and mood. This could explain its potential effects on libido, which is partly a psychological phenomenon.
- Antioxidant Activity: The flavonoids and other phenolic compounds in the plant act as antioxidants. They help neutralize free radicals, which can protect cells from damage and reduce inflammation. This general wellness property may contribute to health in ways that are independent of the plant's hormonal effects.
The issue is that most of this mechanistic research has been conducted in test tubes or animals. The concentrations used in these experiments often do not reflect the concentrations achieved in the human bloodstream after taking an oral supplement. This helps explain the gap between the promising laboratory findings and the often-dismissive results of high-quality human clinical trials.
Safety, Side Effects, and Risks
While Tribulus terrestris is generally considered safe for most healthy adults when taken in typical doses for short periods (up to 8-12 weeks), it is not without side effects. Most reported side effects are mild, but there are rare, more serious concerns that consumers should be aware of.
Common Side Effects
The most commonly reported side effects are related to the digestive system. These can include stomach pain, cramping, gas, diarrhea, and nausea. These symptoms are often dose-dependent and may subside as your body adjusts to the supplement. Some users also report sleeping difficulty or insomnia, which is why it is generally recommended to take the supplement in the morning or afternoon, not right before bed.
Serious Risks and Case Reports
There are documented case reports of more serious adverse events, although these are rare and often involve high doses or concurrent use of other substances.
- Liver Damage: There have been several case reports linking Tribulus terrestris to liver damage or drug-induced liver injury. In some cases, it is difficult to isolate the cause because those affected were taking multiple supplements. The FDA has issued warnings about products containing Tribulus that were linked to liver injury. This is a significant concern, and individuals with pre-existing liver conditions should avoid it.
- Kidney Toxicity: As Tribulus has a traditional use related to the kidneys, and one of its constituents (the plant itself) contains high levels of oxalates, there is a potential risk of kidney toxicity. Some reports suggest it could potentially aggravate kidney problems or contribute to kidney stone formation in susceptible individuals.
- Priapism: There is a very rare case report of priapism (a prolonged and painful erection) associated with Tribulus terrestris use. This is a medical emergency that requires immediate treatment.
- Hormonal Effects: Even though it may not significantly alter testosterone in healthy men, there are case reports of gynecomastia (breast tissue development in men) and hypogonadism after stopping the supplement, suggesting it may have a more profound effect on the endocrine system in some individuals.
- Drug Interactions: Tribulus may interact with certain medications. It could potentially enhance the effects of blood pressure medications, leading to hypotension. It may also interact with lithium and blood sugar-lowering medications because of its potential effect on electrolytes and metabolism.
The severity of side effects often scales with the dose. Many of the adverse events occurred in people taking very high doses, sometimes exceeding 1000 mg, or 1 gram, per day of standardized extracts. This highlights the important safety principle: "more is not better." The table below summarizes these safety concerns.
| Safety Concern | Risk Category | Recommendation |
|---|---|---|
| Gastrointestinal Upset | Common | Take with food, lower the dose, discontinue if severe. |
| Sleep Disturbances | Common | Take in the morning; avoid evening doses. |
| Liver Injury | Rare but Serious | Avoid if you have liver disease; monitor for signs of jaundice. |
| Kidney Toxicity | Rare but Serious | Avoid if you have kidney issues; stay hydrated. |
| Drug Interactions | Potentially Serious | Consult a doctor if you take blood pressure or diabetes medication. |
Special Considerations: Women, Men, Athletes, and Military
Different populations have different considerations when it comes to Tribulus terrestris. It is not a one-size-fits-all supplement, and certain groups should exercise extra caution or have different expectations.
Does Tribulus Affect Testosterone in Men?
As discussed earlier, the definitive answer for healthy men is generally no. Well-designed studies consistently show no significant elevation in testosterone levels with Tribulus supplementation. While it may influence libido and sexual function through other mechanisms, individuals hoping for a dramatic hormonal boost will likely be disappointed. It does not behave like anabolic steroids or even selective androgen receptor modulators (SARMs).
Is Tribulus Safe and Effective for Women?
Women are often curious about this supplement for libido enhancement and menopausal symptom relief. Some preliminary evidence suggests it might be helpful for hypoactive sexual desire in premenopausal women. For postmenopausal women, some studies indicate it may improve parameters related to sexual health and quality of life, possibly by improving cholesterol balance. However, because the evidence is sparse, women who are pregnant or nursing should absolutely avoid it, as the high saponin content could have undesirable effects on hormone-sensitive tissues. Women with a history of hormone-sensitive cancers, like breast or ovarian cancer, should also avoid it unless discussed with an oncologist.
Athletes and Anti-Doping
For athletes, the key question is legality and testing. Tribulus terrestris is not a banned substance by most major sporting organizations, including WADA (World Anti-Doping Agency). However, the risk lies in supplement contamination. A 2015 study from the Australian Institute of Sport found that a significant percentage of supplements on the market, particularly those marketed for testosterone support, can be contaminated with undeclared or banned substances. This risk is not unique to Tribulus, but it is a valid concern for any athlete using supplements. Always look for third-party testing seals from organizations like NSF Certified for Sport or Informed Sport.
Will Tribulus Show Up on a Military Drug Test?
This is a common concern. Tribulus terrestris itself is not a controlled substance and is not tested for by standard military drug panels, which screen for things like THC, cocaine, opiates, and amphetamines. Therefore, taking a pure Tribulus supplement should not cause a failed drug test. However, as with athletes, the concern lies in the possibility of contamination with substances that are screened for, such as SARMs or prohormones. If you are in the military, it is safest to source products from highly reputable manufacturers that provide third-party purity testing certificates and to avoid any product that makes bold claims about being a "testosterone booster."
Tribulus vs. Ashwagandha: Which Is Better?
The comparison most frequently made is between Tribulus terrestris and ashwagandha, another popular botanical supplement. While both are used for vitality and sexual health, they are fundamentally different plants with different active compounds and mechanisms of action.
- Mechanism of Action: Tribulus works primarily through its saponins and is thought to have a direct effect on pathways related to blood flow and sexual response. Ashwagandha is an adaptogen; it works primarily by reducing stress and cortisol levels. This stress reduction, in turn, can help improve mental well-being and, indirectly, sexual function and stamina.
- Evidence for Testosterone: While the evidence for Tribulus boosting testosterone is weak, the evidence for ashwagandha is slightly more promising. Some randomized controlled trials have shown that ashwagandha extracts can significantly increase testosterone levels in men with low sperm count or elevated stress levels. It also has strong evidence for improving sperm quality and fertility.
- Evidence for Anxiety and Stress: Ashwagandha has robust evidence for reducing anxiety and improving sleep. Tribulus, conversely, has no evidence for these benefits and could even cause insomnia in some people.
- Athletic Performance: Ashwagandha has shown more consistent benefits for athletic performance, including improvements in muscle strength, VO2 max (aerobic capacity), and recovery after exercise. Tribulus has failed to demonstrate these effects in clinical trials.
So, which is better? It depends on your goal. If you are looking for a general adaptogen to manage stress and improve overall well-being, ashwagandha is the clear winner. If your goal is a specific, acute effect on libido, Tribulus might have a slight edge in the limited evidence, but the difference is not profound. For overall hormonal and performance support, ashwagandha is a better choice based on the current body of research. It is also essential to note that these herbs are not typically taken together and have different safety profiles, so it is best to focus on one or the other rather than combine them.
Supplement Forms, Dosage, and Buying Tips
If you decide to try Tribulus terrestris, navigating the market can be challenging. This section provides practical guidance to help you make an informed choice.
Forms of Tribulus Supplements
- Powder: The dried, ground plant material is the most basic form. It is the least processed but often contains the lowest concentrations of active saponins.
- Capsules: The most common form, containing either the raw herb powder or a standardized extract. Standardized extracts are generally preferred as they guarantee a consistent level of active compounds.
- Liquid Extracts: These are tinctures made by soaking the plant in a solvent (like alcohol) to extract the active compounds. They can be well-absorbed but might have a strong, bitter taste.
When comparing products, focus on products that are "standardized to saponins." A common standard is "20%, 40%, or 45% steroidal saponins." A product that is standardized to 45% saponins is much more concentrated and potent than a raw powder that might only contain 1-2% saponins.
What Is the Best Dose of Tribulus Terrstris?
Determining a clear dosage is complicated because the research is mixed, and there is no official consensus. Doses in clinical trials have varied widely. Based on the research that has shown some benefit for sexual function, a reasonable dose seems to be between 250 mg and 750 mg of a standardized extract (typically with 20-45% saponins) taken once or twice daily.
It is always best to follow the manufacturer's instructions on the label. However, as a general rule, most studies and experts recommend not exceeding 1000 mg (or 1 gram) of a standardized extract per day. As noted earlier, higher doses are associated with an increased risk of side effects without any increased benefit. You should start with a lower dose to see how your body reacts before increasing it.
Buying Tips and Red Flags
Because the dietary supplement industry is not strictly regulated, quality and purity vary greatly from brand to brand. Your top priority should be safety and quality. Here are some quick tips:
- Look for Third-Party Testing: Look for products that have been verified by independent organizations like NSF International, Informed Choice, or ConsumerLab. These certifications indicate the product has been tested for purity and contains what it claims on the label.
- Check the Label: It should list the specific extract concentration (e.g., "Tribulus terrestris (aerial parts) standardized to 45% saponins"). Avoid proprietary blends if you want to know the dose of Tribulus you are actually taking.
- Buy from Reputable Brands: Purchase from large, established supplement manufacturers with a history of good manufacturing practices.
- Red Flags: Be highly skeptical of products that promise overnight results, "dramatic" testosterone increases, or anabolic-like muscle gains. These claims are scientifically unsupported and may indicate a product contains undeclared synthetic ingredients.
A Balanced Decision Framework: Should You Take It?
After reading the evidence, you might still be wondering if you should try it. Here is a simple, practical framework to help you decide, focusing on medical responsibility and realistic outcomes.
- Consider Your Simptoms: If you are a healthy person looking for a daily "testosterone booster" or "performance enhancer," the evidence suggests you will be disappointed. Save your money.
- Evaluate Your Specific Needs: If you are a man or woman experiencing low libido or mild sexual dissatisfaction, Tribulus terrestris is a reasonable option to discuss with your doctor as part of a holistic approach to sexual health.
- Acknowledge the "Why": Low libido can be caused by stress, relationship issues, poor sleep, thyroid problems, or depression. A supplement cannot fix these underlying root causes. Tribulus might provide a slight boost, but it is not a cure.
- Understand the Risk of Guessing: Simply taking a supplement to address symptoms without understanding the cause is a form of self-diagnosis. Hormonal issues should be evaluated with blood tests by a medical professional, not with supplement trials.
- Who Might Benefit? The type of person most likely to benefit is an adult with a healthy lifestyle but mild, uncomplicated sexual dissatisfaction who is looking for a modest, short-term support option. People who are unlikely to benefit are those with severe hormonal issues, athletes looking for muscle gains, or those taking multiple other medications.
Always remember that supplements are accessories to a healthy lifestyle, not replacements for it. Your baseline nutritional status matters. For example, if you are deficient in vitamin D or magnesium, your energy and mood will be poor, and no herbal supplement will fully fix that. It can be helpful to address fundamental health markers first. A strong foundation of Vitamin D and a good multivitamin is often a better starting point than a targeted herbal product.
Key Takeaways
- Tribulus terrestris is a botanical plant used in traditional medicine and marketed as a supplement for libido and performance, but it is not a proven natural testosterone booster.
- High-quality clinical studies consistently show that it does not increase testosterone levels in healthy men.
- The most promising evidence is for improving sexual function (desire, satisfaction) in some men and women with mild sexual dysfunction.
- Evidence for athletic performance, muscle strength, and bodybuilding is very weak and generally fails to show any benefit.
- The active compounds, particularly steroidal saponins, may improve blood flow and nerve signaling, but the clinical relevance of these mechanisms is still uncertain.
- Side effects are usually mild (stomach upset, insomnia), but there are rare risks of liver damage and kidney toxicity, especially at high doses (>1000 mg) or in people with pre-existing conditions.
- Tribulus is generally safe for women, but it is not recommended for those who are pregnant, nursing, or have hormone-sensitive cancers.
- It is not a WADA-banned substance, nor will it cause a standard military drug test to fail, but athletes and military personnel must be wary of supplement contamination and choose third-party-certified products.
- Compared with ashwagandha, Tribulus has weaker evidence for overall hormonal balance and stress relief; ashwagandha may be a better choice for those goals.
- Always consult a healthcare provider before starting any supplement for sexual or hormonal health, especially if you are taking other medications.
Frequently Asked Questions
What does Tribulus terrestris do to your body?
In theory, the saponins in Tribulus terrestris can affect blood flow and potentially influence neurotransmitters related to arousal. In practice, its primary reported effect is a modest improvement in sexual desire or satisfaction in some people. It does not significantly change body composition or testosterone levels in a meaningful way for most healthy individuals.
Does Tribulus really increase testosterone?
According to current medical evidence, no. Across multiple randomized controlled trials, standardized Tribulus terrestris supplements have not been shown to increase testosterone levels in healthy men with normal hormone levels. Any claims that it acts as a "natural anabolic" are unsubstantiated.
Is Tribulus better than ashwagandha?
It depends on the goal. For reducing stress and improving sleep (which can indirectly improve well-being), ashwagandha has much stronger evidence. For a potential, direct effect on sexual desire, Tribulus has some specific evidence, but it is not definitively stronger than ashwagandha. For general hormonal health, ashwagandha is the more scientifically supported choice.
What are the side effects of Tribulus?
The most common side effects are mild and include stomach upset, diarrhea, gas, and insomnia. More serious, but rare, side effects include signs of liver damage (jaundice), kidney issues, and very rarely, priapism (a prolonged erection). Most side effects are associated with high, prolonged doses.
Can Tribulus terrestris cause liver damage?
There have been documented case reports of liver injury linked to supplements containing Tribulus terrestris, though this is rare. It is often difficult to isolate because other factors are involved. Because of these reports, individuals with pre-existing liver conditions should avoid this supplement, and everyone should be alert to signs of liver distress like yellowing skin or dark urine.
Is Tribulus safe for women?
In short-term studies, it appears safe for most pre- and post-menopausal women, and it may help with libido. However, it is absolutely not safe for pregnant or breastfeeding women. Women with a history of hormone-sensitive reproductive cancers should also avoid it due to its potential, albeit unclear, hormonal activity.
Will Tribulus show up on a military drug test?
No, Tribulus terrestris itself is not a controlled substance and should not trigger a standard military drug test. However, you should be meticulous about the source of your supplement. Contaminated products or those with hidden ingredients (like prohormones) could test positive. Always buy from reputable, third-party-tested brands.
What is the best dose of Tribulus terrestris?
A common dose in research is 250 mg to 750 mg of a standardized extract (usually 20% to 45% saponins), taken once or twice a day. You should never exceed 1000 mg per day unless directed by a physician. Start at a lower dose to assess tolerance.
How long does it take for Tribulus to work?
If you are going to experience any benefits, particularly related to libido, it typically takes several weeks. Some studies show effects after 4 weeks, while others have used up to 8-12 weeks. It is not an immediate-effect supplement.
Can I take Tribulus with other supplements?
It is generally not recommended to combine it with other herbal supplements that affect hormones without professional guidance. If you take a multivitamin or magnesium, it is fine to take them at the same time. However, you should be cautious about taking it with medication for blood pressure or diabetes, as interactions are possible.
Final Conclusion
Tribulus terrestris is a fascinating botanical with a long history of use, but its modern reputation as a powerful hormonal or performance enhancer is not supported by the weight of scientific evidence. The marketing has significantly outpaced the clinical reality. While there is a glimmer of hope for its role in supporting sexual desire and function, it is not a magic bullet for testosterone or muscle building.
If you choose to explore this supplement, do so with realistic expectations and a strong emphasis on safety. Prioritize high-quality, third-party-tested products, start with a low dose, and always discuss its use with a healthcare provider, especially if you have any underlying health conditions. A supplement like this should only be a small piece of a much larger puzzle that includes a healthy diet, regular exercise, and good sleep—the true foundations of vitality and well-being.
Disclaimer: This article is for informational purposes only and does not constitute medical advice. Always consult with a qualified healthcare professional before starting any new supplement, especially if you are pregnant, nursing, taking medication, or have a medical condition.
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