What is Lomatium?

Lomatium (Lomatium dissectum) is a large-rooted perennial plant from the carrot family that grows across the arid, rocky slopes of western North America. Indigenous nations — particularly the Great Basin and Pacific Northwest peoples — relied on it heavily as a medicine plant, earning it the nickname 'Indian Consumption Plant' because of its traditional use against serious respiratory illness. The root was eaten, smoked, made into poultices, or brewed into tea depending on the tribe and the condition being treated.

How does Lomatium work?

Lomatium's antiviral activity is largely attributed to a unique resin fraction and specific compounds like suksdorfin and tetrahydrofuranoid lignans, which appear to interfere with viral replication and disrupt the ability of viruses to enter and spread within cells. It also has broad antimicrobial properties, helping the body fight bacterial co-infections that often accompany respiratory illness. Additionally, some of its compounds support immune cell activity and have mild anti-inflammatory effects, which can ease the severity of symptoms.

What forms does Lomatium come in?

Tincture is the most popular and traditionally favored form — typically made with high-proof alcohol to capture the resin fraction. Start with a lower dose and increase gradually to minimize the risk of the detox rash. Capsules of dried root are more convenient but may not capture the full resin profile. Glycerites are a good alcohol-free option, though potency may be slightly lower. Topical salves are used for skin infections and wound healing.

Where it comes from:

During the devastating influenza pandemic of 1918, anecdotal reports from physicians and herbalists in the Pacific Northwest noted that Native communities using Lomatium as food and medicine appeared to have significantly lower mortality rates. While this was observational and uncontrolled, it generated sustained interest in the plant among herbal practitioners and eventually prompted early laboratory investigations into its antiviral compounds.

What does Lomatium help with?

• Cold and flu: Lomatium is most widely used at the first sign of a cold or flu to shorten duration and reduce severity. Its resin compounds are thought to slow viral replication, giving your immune system a better chance to get ahead of the infection early.
• Respiratory infections (bronchitis, URI): The root has a long history of use for deep chest infections and bronchitis. It acts as both an antimicrobial and an expectorant, helping loosen mucus and fight the organisms causing the infection at the same time.
• Chronic viral illness (EBV, CMV): Herbalists frequently reach for Lomatium in cases of chronic, smoldering viral infections like Epstein-Barr virus (EBV) or cytomegalovirus (CMV). The antiviral compounds may help suppress viral activity over time when used as part of a longer protocol.
• Sinus infections: Lomatium's combined antimicrobial and anti-inflammatory properties make it useful for stubborn sinus infections, particularly when both viral and bacterial components are suspected. It is often combined with other antimicrobial herbs in these cases.
• Bacterial chest infections: Beyond viruses, Lomatium shows activity against certain bacteria that commonly infect the respiratory tract. Traditional use and laboratory studies both support its role as a broad-spectrum antimicrobial plant.
• Immune system support: Even outside of active illness, Lomatium can be used in shorter courses during high-risk seasons or periods of immune stress to help the body stay resilient. It is generally not used as a daily year-round supplement the way an adaptogen might be.
• Skin infections (topical use): Applied as a salve or poultice, Lomatium has traditional use for wound care and skin infections. Its antimicrobial properties may help prevent secondary infection and support healing.
• Whooping cough (pertussis): Historically used by Indigenous healers for severe, spasmodic respiratory conditions including whooping cough-like illnesses. Modern herbalists still include it in protocols for persistent, deep coughs, though it should complement — not replace — medical care for confirmed pertussis.

What can Lomatium help prevent?

• Reduced severity of seasonal respiratory illness when taken at first symptoms
• Potential reduction in secondary bacterial infection during viral illness

Which foods are rich in Lomatium?

Lomatium is a wild medicinal root and is not present in common foods. However, you can support similar antiviral and immune pathways through your diet. Focus on: elderberries and dark berries (rich in antiviral anthocyanins), garlic and onions (broad-spectrum antimicrobial allicin), citrus fruits and bell peppers (high vitamin C for immune function), mushrooms like shiitake and maitake (beta-glucans that activate immune cells), and green tea (EGCG catechins with documented antiviral activity). These foods work alongside Lomatium rather than replacing it.

What are the side effects of Lomatium?

• Whole-body detox rash (most well-known side effect: reduce dose if this occurs)
• Nausea or digestive upset, especially on an empty stomach
• Headache (less common)
• Photosensitivity: increased susceptibility to sunburn due to furanocoumarins
• Skin irritation with topical use in sensitive individuals

Good to know:

Lomatium is generally well tolerated at recommended doses, but it has one distinctive and well-documented reaction: a whole-body skin rash that can appear in some people, especially first-time users. This rash is thought to be a detoxification response rather than a true allergy and typically resolves when the dose is stopped or reduced. It is harmless but can be alarming if you are not expecting it. Starting with a low dose and building up slowly is strongly recommended.

How much Lomatium should you take?

• Recommended daily: Tincture (1:5 in 60–70% alcohol): 2–5 mL, 2–3 times daily during acute illness. For prevention or milder support: 1–2 mL, 2 times daily. Capsules of dried root: 500–1000 mg, 2–3 times daily. Always start at the low end of the range and increase gradually.
• Best time of day: Spread doses throughout the day rather than taking all at once to maintain consistent blood levels of active compounds.
• With or without food: Best taken with a small amount of food to reduce the chance of nausea. The fat-soluble resin fraction may also absorb slightly better when consumed with a meal containing healthy fats.
• Time to effect: Acute antiviral effects may be felt within 24–72 hours of starting. Broader immune and chronic viral support typically requires 2–4 weeks of consistent use.
• How long to take it: For acute illness: use for the duration of symptoms, typically 5–14 days. For chronic viral conditions: use in 4–6 week cycles with 2-week breaks. Not recommended as a daily, year-round supplement without practitioner guidance.