Is Boldo Tea Safe? 6 Side Effects and Who Should Skip It

Boldo is a short-term tea, not a daily one.

That single idea answers most of the questions people type into Google about it. In Peru, a cup of boldo after a greasy chicharrón breakfast or a heavy Sunday lunch is as normal as coffee. Grandmothers in Lima keep a box of it next to the manzanilla. But the same leaf that settles a full stomach has a few real safety issues that most tea blogs skip.

We sell boldo, and we also read the research on it. Here are six things to know before you brew, plus who should skip it entirely.

First, what boldo is

Boldo (Peumus boldus) is an evergreen shrub native to central Chile. It is not a Peruvian plant, but it crossed the border generations ago and is now sold in almost every Peruvian market and pharmacy. The leaves are used for digestion and to support bile flow. Germany's Commission E, a respected expert panel on herbal medicine, approved boldo leaf for mild stomach cramps and indigestion, with specific warnings. Those warnings are the heart of this list.

1. It contains ascaridole, which is hard on the liver in large amounts

Boldo leaves hold a small amount of essential oil. Part of that oil is ascaridole, a compound that is toxic to the liver in high doses. A normal cup of tea made from dried leaves carries only a small amount, because most of the oil does not dissolve well in hot water. Concentrated extracts and boldo essential oil are a different story, and there are a handful of published case reports of liver injury linked to boldo products.

What this means for you: stick to tea from dried leaves, never drink or swallow boldo essential oil, and do not stack boldo with other herbs or drugs that stress the liver.

2. It is meant for short stretches

Commission E and later European guidance treat boldo as a remedy for occasional symptoms, not a lifelong habit. Traditional Peruvian use lines up with that: a cup after a big meal, or for a few days when digestion feels off. A sensible pattern is one cup, up to twice a day, for no more than a few weeks, then a break. Our boldo brewing guide covers strength and steeping time.

3. It can increase the effect of blood thinners

A 2001 case report in the journal Pharmacotherapy described a woman on warfarin whose blood clotting numbers rose after she started taking boldo along with fenugreek. When she stopped, her numbers came back down. One case does not prove a rule, but warfarin has a narrow safe range. If you take warfarin or any anticoagulant, skip boldo unless your doctor approves it, and stop it at least two weeks before surgery.

4. It stimulates bile, which is a problem for some people

Boldo encourages the gallbladder to release bile. That is the traditional reason it helps after fatty food. But if you have gallstones, a blocked bile duct, or serious liver disease, pushing more bile is the wrong move. Commission E lists bile duct obstruction and severe liver disease as reasons not to use boldo at all. If you have ever had gallbladder pain, talk to a doctor before your first cup.

5. It is not for pregnancy or breastfeeding

"Is boldo tea safe during pregnancy?" is one of the most searched questions about it, so here is a clear answer: no, avoid it. Boldo has a traditional reputation in parts of South America as a herb to avoid in pregnancy, and animal research on boldine, one of its main compounds, raised concerns about effects on pregnancy in rats. There is no human safety data. The same caution applies while breastfeeding and for young children.

6. Mild side effects do happen

Even at normal amounts, some people notice:

• Nausea or stomach discomfort, especially on an empty stomach
• A strong, bitter, almost medicinal taste that some people find hard to drink
• More frequent urination, since boldo has a mild diuretic effect
• Rarely, allergic reactions

If you feel unwell after a cup, stop. A tea for digestion should not make your digestion worse.

Who should skip boldo tea

Skip boldo, or ask your doctor first, if you:

• Are pregnant, trying to get pregnant, or breastfeeding
• Take warfarin, other blood thinners, or have surgery coming up
• Have gallstones, a blocked bile duct, or liver disease
• Take medicines that are hard on the liver, such as high-dose acetaminophen
• Have kidney disease or take diuretics
• Are giving it to a child

If none of those apply, boldo as an occasional after-meal tea has a long track record. The liver and detox support collection has other options if boldo is not the right fit for you.

Frequently asked questions

Is boldo tea good for you?

For occasional indigestion or a heavy meal, many people find it helpful, and Commission E recognized it for that use. It is not a daily wellness tonic, and there is no good evidence it "detoxes" the liver.

Does boldo tea have caffeine?

No. Boldo is caffeine-free, so an evening cup after dinner will not keep you awake.

How many cups of boldo tea a day is safe?

Traditional guidance is one cup, up to two times a day, for short periods. More is not better with boldo, because of the ascaridole.

Can I drink boldo tea every day?

For a few weeks at a time, most healthy adults tolerate it. Take a break after that, and avoid year-round daily use.

The bottom line

Boldo earned its place in Peruvian kitchens as the tea you reach for after you ate too much. Treat it that way: occasional, short-term, made from dried leaves, and skipped entirely if you are pregnant, on blood thinners, or have a gallbladder or liver problem. Used like that, it is a simple, old habit worth keeping.

These statements have not been evaluated by the Food and Drug Administration (FDA). This product is not intended to diagnose, treat, cure, or prevent any disease. This article is for education and does not replace advice from a qualified health professional.