Pau d'Arco: A Tree Bark Used in Traditional Medicine
Pau d'arco is the inner bark of a South American tree called Tabebuia, sometimes sold as tea, powder, or supplement. People have used it for centuries in traditional medicine, particularly in Brazil and Peru, for a wide range of health concerns. Today it shows up in wellness shops and online retailers, often marketed for immune support, inflammation, and fungal issues.
The bark contains compounds called naphthoquinones, which laboratory studies suggest may have antimicrobial and anti-inflammatory properties. However, the amount of research on pau d'arco in humans is small compared to the claims made about it, and much of what we know comes from test-tube and animal studies rather than clinical trials in people.
Key Takeaways
- Pau d'arco is tree bark traditionally used in South America and now sold as tea, powder, or capsules in the United States.
- Laboratory studies show some compounds in pau d'arco may fight bacteria and fungi, but human studies are limited and results are mixed.
- Common reasons people use it include supporting immune function, reducing inflammation, and addressing fungal infections, though evidence for these uses varies.
- Pau d'arco can interact with blood thinners and may cause side effects like nausea or dizziness, so talking with a doctor before use is important.
What Research Shows About Pau d'Arco
Most studies on pau d'arco have been done in laboratories or in animals, not in people taking it by mouth. Test-tube research has found that compounds in the bark can slow the growth of certain bacteria, fungi, and even some cancer cells. These findings are interesting to scientists, but they do not automatically mean the same thing happens when someone drinks pau d'arco tea.
A small number of human studies exist, mostly from Brazil and published in Portuguese or Spanish. These studies suggest pau d'arco may help with certain fungal infections and reduce inflammation markers in the blood. However, the studies are often small, use different doses, and do not always compare pau d'arco to a placebo or standard treatment. This makes it hard to know how much of any benefit comes from the bark itself versus other factors.
The U.S. National Institutes of Health and major medical organizations have not declared pau d'arco a proven treatment for any condition. This does not mean it does nothing—it means the evidence is not yet strong enough to make a confident claim.
Common Reasons People Use Pau d'Arco
People turn to pau d'arco most often for three reasons: immune support, inflammation reduction, and fungal infections. The immune support claim rests partly on the bark's traditional use and partly on laboratory findings that some of its compounds can kill microbes. However, having antimicrobial compounds in a test tube is different from strengthening immunity in a living person.
For inflammation, some users report feeling less joint pain or swelling after taking pau d'arco regularly. A few small studies have measured drops in inflammatory markers in the blood, though these changes were modest and not always consistent across studies. For fungal infections like candida overgrowth, the evidence is slightly stronger—some research suggests pau d'arco may slow fungal growth—but most doctors still recommend proven antifungal medications as a first step.
People also use pau d'arco for energy, digestion, and general wellness, though these uses have even less research behind them. Marketing materials sometimes claim pau d'arco can do many things at once, which is a sign to be cautious: a single substance rarely fixes multiple unrelated problems.
How Pau d'Arco Is Sold and How People Use It
Pau d'arco comes in several forms. The most common is tea made from dried bark chips, which you steep in hot water for 5 to 15 minutes. It has a bitter, woody taste. You can also buy it as a powder to mix into drinks, as capsules or tablets, or as a liquid extract. Prices vary widely depending on the form and brand.
Typical doses in studies and on product labels range from 500 milligrams to 3 grams per day, often split into two or three doses. Some people take it daily for weeks or months; others use it short-term when they feel sick. There is no official recommended dose because pau d'arco is not an approved medication, and different products contain different amounts of the active compounds.
Quality varies between brands. Some products contain little of the active compounds, while others contain more. The U.S. Food and Drug Administration does not test supplements before they are sold, so you cannot be certain what you are getting without independent testing.
Side Effects and Safety Concerns
Pau d'arco is generally well-tolerated at low doses, but it can cause side effects. The most common are nausea, dizziness, and stomach upset, especially when taken on an empty stomach or in large amounts. Some people report headaches or a bitter aftertaste that lingers.
More serious concerns arise with certain medications. Pau d'arco may thin the blood slightly, so it should not be mixed with blood thinners like warfarin or aspirin without a doctor's approval. It may also interact with diabetes medications or medications processed by the liver. If you take any regular medications, checking with a doctor or pharmacist before starting pau d'arco is important.
Pregnant and nursing people should avoid pau d'arco because safety in pregnancy has not been studied. People with bleeding disorders or scheduled surgery should also talk to a doctor first. If you experience unusual bruising, bleeding, or severe nausea after starting pau d'arco, stop using it and contact a healthcare provider.
How Pau d'Arco Fits Into a Wellness Routine
If you are interested in pau d'arco, think of it as one option among many, not a replacement for proven treatments. If you have a fungal infection, a doctor can prescribe medications with stronger evidence. If you are managing inflammation from arthritis or another condition, anti-inflammatory medications, physical therapy, and dietary changes have more research behind them.
Pau d'arco may be worth exploring if you have tried other approaches and want to add something with a long traditional history, but go in with realistic expectations. It is not a cure-all, and it is not a substitute for medical care when you need it. Starting with a small amount—such as one cup of tea—and observing how you feel over a week or two is a reasonable way to test whether it works for you personally.
Keep a straightforward record of what you notice: energy levels, digestion, pain, mood, or whatever brought you to pau d'arco in the first place. This helps you decide whether to continue, adjust the dose, or try something else. Wellness is personal, and what works for someone else may not work for you.
Frequently Asked Questions
Is pau d'arco the same as lapacho?
Lapacho is another name for the same tree and bark, used interchangeably in most products. Both refer to Tabebuia species from South America. The terms are not standardized, so a product labeled "pau d'arco" and one labeled "lapacho" may contain the same thing.
Can pau d'arco treat a yeast infection?
Some laboratory and small human studies suggest pau d'arco may slow yeast growth, but evidence is not strong enough to recommend it as a first-line treatment. Proven antifungal medications prescribed by a doctor work faster and more reliably. Pau d'arco might be considered as an additional step, but only with a doctor's knowledge.
How long does it take to feel effects from pau d'arco?
There is no standard timeline. Some people report feeling changes within days; others notice nothing after weeks. This variation is normal with herbal products and reflects differences in individual bodies, the dose, and the form used. Patience and consistent use over at least two to four weeks is usually needed to assess whether it works for you.
Is pau d'arco safe to take every day?
Short-term daily use appears safe for most people at standard doses, but long-term safety has not been thoroughly studied in humans. If you plan to take pau d'arco regularly for more than a few weeks, mention it to a doctor, especially if you take other medications or have any health conditions.
Where can I find high-quality pau d'arco?
Look for brands that test their products for purity and potency through third-party labs. Organizations like USP, NSF, or ConsumerLab verify some supplements. Reputable health food stores and online retailers often carry tested brands. Avoid products with vague sourcing or unusually low prices, as these may contain less of the active compounds.