Boldo Toxic?

Updated 2026-03-06| 3 min read| 1,729 found this helpful
Boldo
1

All parts of the boldo plant are toxic, containing the isoquinoline alkaloid boldin and allergenic essential oil component ascaridol

2

Human exposure can cause hallucinations, behavioral disturbances, and liver injury marked by elevated liver enzyme levels

3

Boldo is often confused with highly toxic Kalmia latifolia, raising accidental poisoning risk

FAQ

Is Boldo toxic to Humans?

Hallucinations and behavioral impairment after boldo leaf tea consumption (reported in a 12-year-old girl); elevated total bilirubin, ALAT/GPT, and ASAT/GOT after 5 months of boldo extract use (reported in an elderly male); reduced motor coordination observed in rat studies (Low)

Is Boldo toxic to Cats?

No specific toxicity data available; monitor for vomiting, disorientation, and lethargy if ingestion is suspected (Unknown)

Is Boldo toxic to Dogs?

No specific toxicity data available; monitor for vomiting, disorientation, and lethargy if ingestion is suspected (Unknown)

Is Boldo toxic to Horses?

No specific toxicity data available; monitor for reduced feed intake, disorientation, and lethargy if ingestion is suspected (Unknown)

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Toxicity Details

Humans
Low

Hallucinations and behavioral impairment after boldo leaf tea consumption (reported in a 12-year-old girl); elevated total bilirubin, ALAT/GPT, and ASAT/GOT after 5 months of boldo extract use (reported in an elderly male); reduced motor coordination observed in rat studies

Cats
Unknown

No specific toxicity data available; monitor for vomiting, disorientation, and lethargy if ingestion is suspected

Dogs
Unknown

No specific toxicity data available; monitor for vomiting, disorientation, and lethargy if ingestion is suspected

Horses
Unknown

No specific toxicity data available; monitor for reduced feed intake, disorientation, and lethargy if ingestion is suspected

Toxicity Snapshot

Toxic PartsEntire plant
Exposure RouteOral ingestion (consumption of boldo leaves, homemade teas, commercial herbal supplements containing boldo extract, or accidental plant part consumption)
Toxic CompoundsBoldin (isoquinoline alkaloid); Ascaridol (allergenic essential oil component)

First Aid & Prevention

First 30 Minutes

  • • Rinse mouth thoroughly with clean water immediately after ingestion
  • • Do not induce vomiting unless explicitly instructed by a poison control center or medical professional
  • • Collect any remaining plant or supplement material to confirm identity for treatment guidance

Contact Vet Immediately

  • • Suspected ingestion of any amount of boldo plant or boldo-containing products
  • • Onset of unusual symptoms (lethargy, disorientation, vomiting) after potential exposure
  • • Known consumption of unlabeled herbal supplements that may contain boldo

Prevention

  • • Do not use boldo-containing herbal products without prior consultation with a licensed healthcare provider
  • • Keep boldo plants and supplements out of reach of children and pets
  • • Confirm plant identity with an expert before use to avoid confusion with toxic lookalikes

Treatment & Prognosis

  • • Administer symptomatic and supportive care as prescribed by a healthcare provider or veterinarian
  • • Monitor liver function for patients with confirmed long-term boldo exposure
  • • Treat allergic reactions to ascaridol with appropriate supportive care as clinically indicated
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Professional Toxicology

Scientific NamePeumus boldus Molina
AliasesBoldo (German)、Boldo (French)、Boldo (Italian)
Toxicity Grade
HumansLow
CatsUnknown
DogsUnknown
HorsesUnknown
Target Organs
Nervous systemLiver
Mechanism of Action

• Isoquinoline alkaloids like boldin exert neurotoxic effects and impair normal liver function

• Ascaridol in the plant's essential oil triggers allergic reactions and contributes to organ toxicity

Other Species Risk (CliniTox)

Information from CliniTox veterinary text.

Rat: Oral administration of aqueous boldo extract over 21 days led to a significant reduction in motor coordination (measured via rotarod test latency time) compared to control groups
Confusion Risk

The following plants look similar and may be confused:

Mountain laurel Kalmia latifolia
Boldo may be confused with Kalmia latifolia, which is highly toxic; Kalmia produces distinct clustered pink or white bell-shaped flowers, unlike the small pale yellow-white flowers of boldo
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Related Toxic Plants

Chilean laurel
Laurelia sempervirens
Moderate
Pigeonwood
Hedycarya arborea
Low to moderate
Southern sassafras
Atherosperma moschatum
Low

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Data Sources

This information is for reference only and does not constitute medical advice. If ingestion or poisoning is suspected, seek medical or veterinary attention immediately.

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