What Pau d'Arco Is and Where It Comes From

Pau d'arco is the inner bark of a South American tree called Tabebuia, harvested and dried for use as a tea, tincture, or supplement. The tree grows in rainforests across Brazil, Peru, and other parts of Central and South America, and Indigenous peoples have used the bark for centuries in traditional medicine. The active compounds in pau d'arco include naphthoquinones, which give the bark its characteristic properties.

The bark itself is tough and fibrous, which is why most people brew it as a tea rather than swallow it whole. A typical preparation involves simmering dried bark chips in water for 5 to 15 minutes, then straining. You can also buy pau d'arco in capsule form, as a liquid extract, or as a pre-made tea bag, though the strength and purity vary widely between brands.

Key Takeaways

  • Pau d'arco contains compounds that show activity against certain fungi and bacteria in laboratory studies, but human evidence is limited and mostly from small trials.
  • The most common use is for candida overgrowth and fungal infections, though results in real people are mixed and not may provide.
  • Pau d'arco can thin the blood and interact with blood thinners, diabetes medications, and some other drugs, so check with your doctor before starting.
  • Quality varies significantly between suppliers; look for products that specify the bark type and have been tested by a third party.
  • Typical doses range from one cup of tea daily to 500–1,500 mg in capsule form, but there is no official standard dose.

What the Research Shows About Pau d'Arco

Laboratory studies have found that compounds in pau d'arco bark can slow the growth of candida, aspergillus, and other fungi, as well as some bacteria. These results come from test-tube and animal studies, which show promise but do not automatically translate to the same effect in a living person. The human evidence is much thinner: most studies are small, conducted decades ago, and often poorly designed by modern standards.

A few small trials have looked at pau d'arco for candida infections and found some benefit, but the studies were not large enough or rigorous enough to be considered strong proof. One older study suggested it might help with certain skin fungal infections, and another looked at it for oral thrush, but neither was definitive. If you are considering pau d'arco for a specific infection, talk to your doctor about whether it makes sense alongside or instead of standard treatment—do not rely on it alone for serious infections.

Common Uses and What to Expect

Most people use pau d'arco for candida overgrowth, athlete's foot, ringworm, or other fungal issues. Some also take it for general immune support or as part of a broader detox routine, though the evidence for those uses is even weaker. A few people report it helps with energy or inflammation, but these claims rest mostly on anecdote rather than research.

If you do try pau d'arco, expect results to be slow. Fungal infections take time to clear, and pau d'arco is not a fast-acting drug. Most people who report benefit say they noticed changes after several weeks of regular use. Some notice nothing at all. Pau d'arco is not a replacement for medical diagnosis—if you think you have a fungal infection, see a doctor first so you know what you are actually treating.

How to Prepare and Use Pau d'Arco

The most traditional and often most effective way to use pau d'arco is as a tea. Simmer 1 to 2 teaspoons of dried bark chips in 8 ounces of water for 5 to 15 minutes (longer simmering extracts more of the active compounds), then strain and drink. You can make a larger batch and refrigerate it for a few days. Most people drink one cup daily, though some use it twice daily. The taste is bitter and woody—adding honey or lemon can help.

If you buy capsules, follow the label dose, which typically ranges from 500 to 1,500 mg daily in divided doses. Tinctures are more concentrated; a common dose is 1 to 2 teaspoons in water once or twice daily. Because there is no official standard dose, start at the lower end and increase gradually if you tolerate it well. Stop if you develop nausea, dizziness, or other side effects.

Side Effects and Drug Interactions to Know

Pau d'arco is generally well tolerated at typical doses, but it can cause nausea, dizziness, or mild stomach upset in some people. More importantly, it has blood-thinning properties, which means it may increase bleeding risk if you take warfarin, aspirin, clopidogrel, or other anticoagulants. It may also lower blood sugar, so if you take diabetes medications, monitor your levels closely and talk to your doctor before starting.

Pau d'arco may also interact with certain cancer drugs and immunosuppressants. If you are pregnant, nursing, or have a bleeding disorder, avoid it unless your doctor says it is safe. Because pau d'arco is not regulated as a drug, the FDA does not monitor it for safety the way it does prescription medications, so adverse events are often underreported.

Choosing a Quality Pau d'Arco Product

The supplement market for pau d'arco is unregulated, which means quality, potency, and purity vary widely. Some products contain little active compound, others are contaminated with mold or heavy metals, and some are mislabeled entirely. Look for products that specify the tree species (Tabebuia impetiginosa is the most studied), list the part used (inner bark is standard), and state the amount of active compound if known.

Third-party testing by organizations like NSF International, USP, or ConsumerLab adds credibility—these labs test for potency, purity, and contaminants. Check the label for a statement that the product has been tested. Reputable suppliers will also provide a certificate of analysis on request. Expect to pay more for tested products, but the extra cost is worth it if you are going to use pau d'arco regularly.

Pau d'Arco Versus Other Antifungal Approaches

If you are dealing with a fungal infection, you have several options. Prescription antifungals like fluconazole or terbinafine are proven, fast-acting, and backed by strong evidence—they are the standard choice for serious infections. Over-the-counter creams and powders work well for mild skin fungal infections. Pau d'arco sits in the middle: it has some evidence, works slowly, and is less reliable than prescription drugs but may appeal to people who want to avoid pharmaceuticals or who have mild, persistent issues that have not responded to other approaches.

Other herbal options sometimes used for fungal issues include tea tree oil (topical), oregano oil, and garlic. Like pau d'arco, these have some laboratory evidence but limited human proof. If you are trying multiple approaches at once, it becomes hard to know which one (if any) is actually helping. Start with one, give it at least a month, and track any changes before adding something else.

Frequently Asked Questions

Can I use pau d'arco if I take blood thinners?

No, not without talking to your doctor first. Pau d'arco has mild blood-thinning effects, and combining it with warfarin, aspirin, or similar drugs raises your bleeding risk. Your doctor may be able to monitor you closely if you want to try it, or may recommend you avoid it altogether. Do not start pau d'arco on your own if you are on anticoagulants.

How long does it take to see results from pau d'arco?

Most people who report benefit say they notice changes after 2 to 4 weeks of regular use, though some take longer. Fungal infections are slow to clear, and pau d'arco is not a fast-acting treatment. If you see no improvement after 6 to 8 weeks, it may not be working for you, and you should consider other options or see a doctor.

Is pau d'arco safe to take long-term?

There is limited data on long-term use. Most people use it for a few weeks or months to address a specific issue, then stop. If you want to take it regularly for months, talk to your doctor first, especially if you have any health conditions or take medications. Long-term safety has not been well studied in humans.

Can pau d'arco cure candida overgrowth?

Pau d'arco may help reduce candida in some people, but it is not a proven cure. Candida overgrowth is complex and often linked to diet, antibiotics, or immune function—pau d'arco alone is unlikely to fix it. Work with a doctor to identify the underlying cause and address it alongside any herbal support you choose.

What is the difference between pau d'arco tea and capsules?

Tea is the traditional form and may extract more of the active compounds through heat and time. Capsules are convenient and easier to dose consistently, but the amount of active compound depends on the product quality. Both can work; choose based on what fits your routine and what you tolerate best.