Lomatium Dissectum
A root used by Indigenous peoples of the American West and marketed as a natural antiviral. There are no human trials at all, and the best-documented human effect in the literature is a whole-body rash.
Evidence last reviewed: August 2026
What the science says
- Antiviral activity Limited evidence
An ethnopharmacological screening study of British Columbian medicinal plants found antiviral activity in cell culture for several species including Lomatium. Nothing has been tested in people.
- Characteristic rash Limited evidence
The most consistent human observation is a diffuse measles-like rash after ingestion, described in a published case report and in older ethnobotanical accounts of the plant's water-soluble constituents.
Dosage & safety
Studied doseNo studied dose exists. Tinctures are typically labelled at 10–30 drops up to three times daily, which reflects tradition rather than evidence.
SafetyA widespread itchy rash is a well-documented reaction and can appear days into use. Avoid in pregnancy and breastfeeding and in anyone taking immune-modulating drugs; there are no formal toxicity studies.
Scientific references
Where to buy
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