Pau D'arco Bark,
An Immune Enhancing Herbal Antibiotic


Pau d'arco bark comes from the inner layer of bark on the pink flowering lapacho tree native to the South American Amazonian rainforest regions where it has been used as a therapeutic herbal tea by indigenous cultures for centuries. 

The tree is made up of a very hard wood and tough exterior that is resistant to many diseases. Likewise, the bark inside this surface layer is a strong immune system modulator, optimizing immune response with certain compounds like the active ingredient called lapachol.

The bark tea or extract is used as a potent medicinal herb for its natural antibiotic properties, eliminating potentially harmful bacteria and yeast from the body, while supporting the growth of beneficial microbial strains.

It is not technically an adaptogen, but works on the secretory immune system or the body's first line of defense against pathogenic organisms. Adaptogens specifically function on deeper immune reserves and are more beneficial when taken for extended periods of time. Pau d'arco on the other hand, as a purifying herb, is best used for short periods of time to heal certain immune associated disorders. 

It can be used with many of the major tonics or Ayurvedic herbs, but is best used by itself or with other cleansing herbs when dealing with conditions like candida overgrowth, parasites or autoimmune related diseases.

Pau d'arco is beneficial as a natural anti-inflammatory and pain reliever for a wide range of conditions such as arthritis, prostatitis, ulcers and also may be effective as an antitumor agent. In research investigations studying other specific components, like cyclopentene dialdehydes and beta-lapachone, results showed reduced inflammation as well as the ability to inhibit angiogenesis and slow tumor cell growth.

Some of the primary constituents in the bark, composed of quinones, flavonoids, like quercetin, and a number of glycoside compounds, are very potent antifungal and antiviral complexes. These specific attributes make it a top cleansing herb for candida and yeast overgrowth, fungal and viral infections in addition to skin conditions like psoriasis or eczema.

Pau d'arco works also as a blood purifier which is one of the reasons is it effective for many skin conditions. Blood cleansing herbs assist liver functions and help to clear out toxic immune inhibiting yeast and fungal strains that can lead to epidermal breakouts and issues.

Many herbalists around the world use pau d'arco bark extracts or tea formulas for a number of fungal conditions including athlete's foot, ringworm, thrush, rashes or nail fungus. It can also be used topically directly on the skin in herbal salves or ointments.

Pau d'arco tea is slightly bitter and astringent but has a very pleasant taste and fragrant aroma. Dried pau d'arco bark can be infused in hot water, but is more beneficial when simmered for 20 minutes. It can be used alone or in herbal tea formulations. As we mentioned, it can be added for its cleansing elements when decocting other tonic herbs or mushrooms such as fo-ti root, chaga and astragalus. The main naphthoquinones, lapachol and beta-lapachone, are considered slightly more effective as an alcohol extract.


What is Pau D'arco?

The lapacho or pau d'arco tree (Tabebuia impetiginosa or Tabebuia avellanedae) is a hard wood native to the Brazilian Amazonian rainforest but has been introduced to other parts of the world where appropriate subtropical climates persist and is somewhat tolerant outside its natural growing zone. It grows all over Central and South America as well as Mexico, Florida, the Caribbean and even the North American coastline.

The tree is a canopy species and can reach heights of 125 ft (38 m) with about 100 different species of the tree coming from the genus Tabebuia. Often used as a common ornamental because of its bright pink to violet trumpet-shaped flowers, it is also very resistant to diseases which make it a beneficial horticulture tree species. Part of the reason for this is that pau d'arco is made of an extremely hard wood and additionally contains disease inhibiting attributes within its woody protective shield.

Also referred to as the taheebo tree, the wood is used today in South American countries as a timber product popular for lumber building purposes. Because of this, it is being over harvested in some areas, like Brazil, where it is an endangered tree species. Tabebuia impetiginosa is also known as ipê and gets its name "pau d'arco" from the Portuguese language. It's Portuguese name, which means "bow stick", comes from the traditional native use of the limbs to make bows for hunting purposes.


Where Does the Bark Come From?

The reddish-brown pau d'arco bark is not taken from the outer bark but from the thin layer between the outer bark and the inner heartwood. When the bark is peeled back, this lining resembles thin moist layers of shredding material. Its primary function is to create new tissues and protective compounds. This is where the most medicinally potent properties are concentrated. 

Pau d'arco bark is typically harvested in a similar way to traditional cork harvesting which removes the outer layer but leaves the living tree intact, which will eventually grow another layer of bark. Pau d'arco is a long living tree species, usually maintaining its life cycle for up to 700 years or more.

Historical Use

The lapacho tree was called "tajy" which means "the divine tree" and was originally used by indigenous peoples of Paraguay, Brazil and Bolivia such as the Guarani, Tupinambá as well as the Incan civilization and their descendants the Kallawaya, a group of traditional healers living in the present day Bolivian Andes. The Kallawaya were once the naturopathic healers of Incan kings and today are familiar with up to 600 pharmaceutical herbs.

The use of pau d'arco bark was first introduced into Western medicine in the 1960's with early research investigating specific compounds like lapachol, which is known to posses antitumor and pain relieving qualities.


Pau D'arco Bark Benefits

Immune System Modulator

When using tree species for medicinal purposes, most "herbs" are extracted from the bark or cambium layer of the tree, where the most potent nutrients and immune modulating substances can be found. This is essentially the immune system of the tree itself. 

The immune enhancing and cleansing substances in pau d'arco bark when consumed as a tea or extract not only help to clear the lymph system and purify the blood, but also function as a natural herbal antibiotic. Unlike antibiotic drugs, pau d'arco doesn't kill all the bacteria in the body, just the potentially harmful or pathogenic bacteria and yeast strains.

Good for Candida Overgrowth

Candida albicans  is a type of fungal yeast that is beneficial to a healthy intestinal ecology in small amounts. The use of prescription antibiotics, an unbalanced diet or other factors can cause an overgrowth or over dominance of this particular strain, causing yeast infections and the elimination of "good bacteria" needed for optimal immune health.

Because of its specific influence as an antifungal and antiparasitic complex, pau d'arco bark is one of the top recommended natural remedies for treating intestinal parasites and candida overgrowth. This provides for a more balanced ratio of intestinal microflora which is needed for proper immune function and the synthesis of certain B vitamins.

It can be used for a period of time, sipped as a refreshing tea throughout the day or conveniently consumed as a liquid extract that can be dropped into drinks and beverages. In cases of severe candida overgrowth it is, of course, also advised to follow a no-sugar diet and adhere to a strict cleansing protocol with additional probiotic supplementation.


In a study entitled, "Selective growth-inhibiting effects of compounds identified in Tabebuia impetiginosa inner bark on human intestinal bacteria", evidence demonstrated that pau d'arco bark hinders the growth of harmful bacteria strains, while selectively ignoring the beneficial microflora like Bifidobacterium and Lactobacillus

The active phytochemical, lapachol, was also shown to be helpful as an antifungal and antibacterial for inhibiting many non-beneficial bacteria including Helicobacter pylori, Staphylococcus aureus and Streptococcus. The bark can therefore be an effective treatment for conditions such as stomach ulcers, skin eruptions, food poisoning and pneumonia.

Anti-Inflammatory Aid Helpful for Autoimmune Diseases

Along with a health promoting whole foods diet and a regular exercise program, supplementing with pau d'arco bark tea or extract is recommended for inflammatory-related diseases and autoimmune disorders, like MS, chronic fatigue syndrome, arthritis and fibromyalgia. 

A 2013 study published in the Journal of Neuroimmunology, the ß-lapachone isolated from pau d'arco bark was shown to have successful outcomes towards treating inflammatory conditions and autoimmune diseases, like multiple sclerosis, by suppressing inflammation of the brain and spinal cord or EAE (encephalomyelitis). The results concluded that "Collectively, these studies suggest mechanisms by which ß-lapachone suppresses EAE and suggest that ß-lapachone may be effective in the treatment of inflammatory diseases such as MS." 

In a study published in the Journal of Ethnopharmacolgy it states that "the ethnopharmacological action of taheebo (pau d'arco) may be due to its negative modulation of macrophage-mediated inflammatory responses by suppressing prostaglandin production. Thus, this water extract may be developed as a new therapeutic remedy for various inflammatory diseases such as arthritis and atherosclerosis." 


May Help Prevent Tumor Growth

The two most studied active ingredients that exhibit immune normalizing impacts are the naphthoquinone constituents called lapachol and beta-lapachone. Both lapachol and beta-lapachone have been researched for their subsequent anticancer or cytotoxic properties. Several studies conducted in 2014 show promising results for prostate, breast, bladder and gastric cancers.

Lapachol has been investigated for its ability "to shrink tumors and reduce the feeling of pain caused by tumor growth", while ß-lapachone is also known to selectively induce apoptotic cell death in a number of human cancer cells. (Source)

Clinical trails in a 2014 study analyzing the mechanisms by which beta-lapachone eliminates cancer cells, it states that "These findings will contribute to our understanding of how cancer cells are selectively killed by beta-lapachone and increase our ability to devise strategies to enhance the anticancer efficacy of this potentially novel drug." 

In another 2014 study it was verified that using probiotic supplementation along with pau d'arco can be beneficial for lapachol synthesis in the body and was shown to be a more effective approach specifically used "against a breast cancer cell line." 

Possible Angiogenesis Inhibitor

Some research has been conducted on the use of pau d’arco bark and the beta-lapachone compound as an antiangiogenic agent, helpful in the reduction of cancerous tumor growths. Angiogenesis, which is the formation of new blood vessels, plays a critical role in stimulating the spread of cancerous cells by providing the blood supply needed to do so. Angiogenese inhibitors (or anti-angiogenic agents) may prevent or slow the growth of cancer as a result. 

The process of angiogenesis is controlled by chemical signals in the body and, typically, their stimulating and inhibiting effects are balanced so that blood vessels form only when and where they are required.

In a study published in the Journal of Cellular Physiology it was concluded that "Neovascularization is an essential process in tumor development, it is conceivable that anti-angiogenic treatment may block tumor growth... beta-lapachone a natural product extracted from the lapacho tree (Tabebuia avellanedae), has been proven to possess anti-cancer and anti-viral effects. We demonstrated that nitric oxide can attenuate the apoptotic effect of beta-lapachone on human endothelial cells and suggest that beta-lapachone may have potential as an antiangiogenic drug."

Benefits the Skin

There are certain cleansing herbs that work together with liver herbs to help detoxify the body. Pau d'arco is one of them, acting as a natural antiseptic that sanitizes the tissues, cells and blood, additionally functioning as a mild laxative to help eliminate undigested waste material. These effects directly help to improve the condition of the skin, by helping the liver do its job more effectively. The liver is the top organ responsible for keeping our skin healthy and free of various skin rashes, eruptions and chronic conditions.

Pau d'arco bark is an antipsoriatic agent helpful in the treatment of psoriasis, a common, chronic, immune-mediated systemic disease characterized by dry, itchy, red skin patches. Research findings have discovered that "Because of their potent activity against the growth of human keratinocytes, some lapacho-derived compounds appear to be promising as effective antipsoriatic agents."  (Source)

The herbal tea or extract can also be used topically as well as internally.


Types of Pau D'arco Bark

  1. Dried Bark or Powder - Used to make tea decoctions or tinctures.
  2. Tinctured Extract - Alcohol extracts of the dried bark.
  3. Capsules or Tablets - Powdered capsules or powder compressed into tablet form.
  4. Herbal Salve - Homemade or purchased salves made from bark extracts or bark infused oil and beeswax.

Pau D'arco Bark Quality

We always recommend purchasing bulk herbs or tea products from a reputable, sustainable fair-trade source. Most pau d'arco bark is available as a wildcrafted herb rather than a cultivated variety.

According to Walter Lübeck,"The best lapacho quality originates from the wild harvest since the complete combination of active ingredients can only be found at an age of 40 years", from the book "Healing Power of Pau D'arco."


How to Use

Pau d'arco bark is a powerful cleansing herb and should be used in appropriate quantities for short periods of time rather than on a regular basis. Be aware that higher amounts of pau d'arco may be toxic to the body and may cause gastrointestinal upset if used in excess. It is best consumed in moderate dosages spread throughout the day rather than all at one time.

Pau d'arco bark can be infused in hot water but is most beneficial when  decocted (simmered) in water for about 20 minutes to release the active ingredients and medicinal components. It is a delicious tasting tea that can be made in quart size quantities to be consumed throughout the day. To make a mild to strong pau d'arco tea use 2T-6T bark per quart of water.

Recommended Dosage:

Tea Decoction - 1 cup 1-4x/day
Tincture - 25-50 drops 1-4x/day
Capsules - 2-3 capsules 1-4x/day

Consume once a day for mild dose and up to 4 times a day for a stronger dose.

Pau d'arco bark is great to use in tonic herb teas to add beneficial cleansing components to the herbal tea formula. For a traditional Shipibo Peruvian tea use pau d'arco with cat's claw, another herb with similar properties. Some recommend that the bark should be used with a squeeze of lemon so tannins can be effectively digested.

Pau d'arco is a medicinal and astringent herb that can also be used topically in salves or ointments for healing skin issues such as eczema, athlete's foot or psoriasis. For vaginal infections a strong tea can also be used as a douche or in a mineral sitz bath.


Pau d'arco should be avoided if pregnant or trying to conceive. Consuming excessive amounts of the bark tea or extract may cause nausea or gastrointestinal upset. Consult your health care provider if taking blood thinning medications as the herb is a blood thinner and should be avoided by people with bleeding disorders or hemophilia.

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