Synopsis

Source of validity: Traditional
Rating (out of 5): 2

Lomatium, a genus of plants native to North America, has a history of traditional use by Native American tribes, particularly for respiratory and infectious ailments. During the 1918 influenza pandemic, anecdotal reports suggested that some Native American communities using Lomatium (notably Lomatium dissectum, also called “desert parsley”) experienced lower mortality rates. These reports, however, are based on oral histories and a handful of early 20th-century herbalists’ observations rather than rigorous scientific data.

Lomatium root preparations—typically tinctures or teas—were used to treat coughs, colds, influenza, and other contagious diseases, believed to possess antiviral and immune-modulating properties. The plant contains various coumarins and other phytochemicals, some of which have shown in vitro antimicrobial or antiviral effects, but these findings are preliminary and not specific to any contagious disease in humans.

Modern clinical studies evaluating Lomatium’s effectiveness against contagious diseases are lacking. Most contemporary references to its use cite traditional and historical accounts rather than controlled research. Thus, while Lomatium has a traditional reputation for supporting the body during contagious illnesses, there is insufficient scientific validation. The evidence rating reflects strong traditional use (2/5), but little to no robust scientific confirmation.

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