Lapacho (Pau d'Arco)

Tabebuia impetiginosa · Bignoniaceae (trumpet vine family)

Impressive chemistry, problematic extraction. The inner bark contains lapachol and beta-lapachone — naphthoquinones with documented antitumor and antifungal activity. But here's the problem: HPLC analysis failed to detect lapachol in aqueous extracts entirely, and beta-lapachone's water solubility is only 0.038 mg/mL. NCI Phase I trials in the 1960s couldn't achieve therapeutic doses without toxicity. What the tea actually delivers: flavonoids (quercetin), tannins (12–18%), and novel water-soluble anti-inflammatory compounds. The compounds most studied are not the compounds you're drinking.

What it’s like, and how to use it

The partBark

KindHerb

CaffeineCaffeine-free

Where it is fromBrazil

TasteEarthy, woody, slightly bitter, astringent — distinctive bark tea flavor

How to brew it

212°F / 100°C
SIMMER 15–20 minutes (a decoction is essential; steeping alone will not do it)
Use 2 tsp per 8oz
Earthy and bitter
Add honey

How to use it

Lapacho/pau d'arco tea (decoction — simmer bark for 15–20 minutes, do not simply steep). Not used in cooking. The decoction method is essential — standard steeping extracts far less than simmering. Can be sweetened with honey to offset the bitterness.

With food

Honey (essential for palatability). Ginger (counteracts potential nausea). Lemon (cuts the bitterness). Best as a standalone medicinal preparation.

With spices

Ginger (the #1 recommended pairing — counteracts nausea side effect + anti-inflammatory stacking). Cloves (eugenol antifungal complements naphthoquinone activity — multi-target antifungal strategy). Cinnamon (cinnamaldehyde antifungal — but CAUTION: both are anticoagulant — additive bleeding risk). Turmeric + black pepper (anti-inflammatory pathway complementarity).

With tea

Ginger Root (essential digestive comfort companion). Echinacea (Western immune + traditional South American immune combination). Peppermint (digestive soothing). Licorice Root (demulcent for the astringent bark taste).

Its story

Where it comes from

Native to Central and South American rainforests. The tree produces spectacular pink-purple flowers. Indigenous peoples of the Amazon — particularly the Guaraní, Tupi and Callawaya — have used the inner bark for centuries. Sustainable harvesting strips inner bark from living trees, which then regenerate, and that matters: badly harvested lapacho kills the tree.

What happened

Used by the Guaraní and Tupi peoples of Brazil for centuries as a primary medicine. The Callawaya of Bolivia used concentrated inner-bark preparations for the skin. The US National Cancer Institute investigated its isolated compound lapachol in the 1960s and closed the investigation in 1974, when the isolate could not reach useful doses without toxicity — a result worth stating plainly, since it is often quoted the other way round. Modern interest is in the whole bark rather than the isolate.

Good for

What the research looked at

Traditionally used in South American Indigenous medicine, where the inner bark was a primary preparation.
Rich in tannins and water-soluble flavonoids.
Must be simmered as a decoction, not steeped — a standard infusion will not extract it, which is the single most common mistake with this bark.
Naturally caffeine-free, earthy and bitter. Traditionally avoided in pregnancy and by anyone on an anticoagulant; ask a pharmacist.

What’s in the leaf

Lapachol (2–3.7% bark — naphthoquinone; antitumor, antifungal in vitro; sparingly water-soluble — UNDETECTABLE in aqueous extract by HPLC). Beta-lapachone (activated by NQO1 enzyme — the anticancer mechanism; water solubility only 0.038 mg/mL). Flavonoids (quercetin — these DO extract into water). Tannins (12.2–17.8%). 163+ identified compounds in the bark.

These teas are foods, sold as such. Nothing on this page is intended to diagnose, treat, cure or prevent any disease.