What is Lungwort?
Lungwort (Pulmonaria officinalis L.) is a perennial flowering herb in the borage family (Boraginaceae), native to the woodlands of Europe and western Asia. It is instantly recognizable by its dark green, oval leaves dotted with distinctive white or pale-green spots, and by its bell-shaped flowers that shift from pink to blue-violet as they mature. The plant typically grows 10-30 cm tall in shady, damp forest habitats. Its name comes directly from its traditional use: the Latin "pulmo" means lung, and the spotted leaves were once believed to resemble diseased lung tissue, a connection that earned it a central place in respiratory folk medicine.
Lungwort has been used since at least the 12th century, appearing in the monastic herbals of Hildegard of Bingen, where it was prescribed for "windy breathing conditions." For centuries, European folk healers brewed lungwort leaf infusions for coughs, bronchitis, and weakened lungs. The aerial parts (leaves and flowers) are the parts used medicinally, sold today as "Pulmonariae Herba" and found in herbal teas, tinctures, and respiratory blends.
Important Distinction: Lungwort (Pulmonaria officinalis) is a flowering plant. It is frequently confused with lungmoss or tree lungwort (Lobaria pulmonaria), which is a lichen, a completely different and biologically unrelated organism. Both share the common name "lungwort" and both have traditional respiratory associations, but they contain different compounds. This breakdown focuses on the herb Pulmonaria officinalis. Always check the botanical name on any product you purchase.
Common Names: Lungwort, Spotted Lungwort, Lungenkraut (German), Pulmonaire (French), Our Lady's Milk Drops, Mary's Tears, Jerusalem Sage, Pulmonariae Herba
Primary Active Compounds:
Mucilage: A gel-like polysaccharide that gives lungwort its soothing, demulcent quality; coats and calms irritated mucous membranes in the throat and respiratory tract
Rosmarinic acid: A key polyphenol with antioxidant and anti-inflammatory properties; often used as a quality marker (3-5% in good material)
Phenolic acids: Including lithospermic, salvianolic, monardic, and yunnaneic acids, which drive much of the antioxidant and COX-2 inhibitory activity
Allantoin: Promotes cell regeneration and tissue repair in mucosal linings
Tannins: Provide astringent effects that help tighten and tone tissues
Flavonoids: Including quercetin and kaempferol derivatives, contributing antioxidant support
Silicic acid (silica): Present in small amounts; traditionally associated with connective and respiratory tissue support
Saponins: Mild expectorant compounds that help loosen mucus
Primary Functions & Benefits
Respiratory Support (Primary Use):
Soothes irritated throat and bronchial passages through high mucilage content
Acts as a natural expectorant, helping loosen and expel mucus
Traditionally used for coughs, bronchitis, catarrh, and chest congestion
May ease the discomfort of dry, persistent, or irritating coughs
Supports overall respiratory tract comfort during colds and seasonal illness
Demulcent action creates a soothing coating over inflamed mucous membranes
Anti-Inflammatory Activity:
Phenolic acids inhibit COX-2, an enzyme central to the inflammatory process
May reduce inflammation in the airways and lungs
Rosmarinic acid contributes notable anti-inflammatory effects
Traditionally applied externally to soothe inflamed skin, wounds, and eczema
Antioxidant Protection:
Rich in polyphenols that scavenge free radicals
Demonstrated antioxidant capacity in multiple laboratory assays (DPPH, FRAP, total antioxidant capacity)
At lower concentrations, lungwort extract protected DNA from oxidative damage in laboratory studies (a hormetic, dose-dependent effect)
May help defend respiratory tissue against oxidative stress
Additional Traditional Uses:
Mild diuretic action, traditionally used to support urinary tract and kidney health
Astringent properties used for soothing digestive complaints
Traditionally used as a depurative (to support the body's natural detox processes)
Applied topically for burns, cuts, wounds, and eczema
Mild immune support during respiratory infections
Recommended Dosages
Important: There is not enough rigorous scientific data to establish standardized clinical dosing for lungwort. The amounts below reflect traditional herbal use, not clinically validated doses. Always follow product label directions and consult a healthcare provider.
Dried Leaf Tea (Infusion):
Standard preparation: 1-2 teaspoons of dried lungwort leaf per cup
Method: Steep in freshly boiled water for 10-15 minutes, then strain
Frequency: 1-3 cups daily during periods of respiratory discomfort
Flavor: Mild and slightly astringent, with a smooth texture from the mucilage; honey or lemon can be added
Tincture:
Typical traditional dose: Follow manufacturer directions; commonly 2-4 mL, 2-3 times daily
Alcohol-based extracts: Note that extraction method affects which compounds are concentrated
Capsules/Powder:
Follow product label: Dosing varies widely by manufacturer and concentration
Look for products that specify Pulmonaria officinalis and ideally standardize to rosmarinic acid content
Duration:
Most herbalists recommend using lungwort for defined, short-to-medium-term periods (during illness or seasonal respiratory challenges) rather than continuous indefinite use
This conservative approach addresses the theoretical pyrrolizidine alkaloid concern (see safety sections)
Timing & Administration
Best Time to Take:
For acute respiratory comfort: Throughout the day as needed, especially when coughing or congestion is bothersome
For nighttime cough relief: A warm cup of lungwort tea in the evening may soothe the throat before bed
For general respiratory support: Spread doses across the day for sustained demulcent action
During illness: Most beneficial when used consistently through the duration of a cold, cough, or bronchial irritation
With or Without Food:
Tea: Can be taken any time; some prefer it between meals to maximize the soothing coating effect on the throat
Tincture: Can be taken in a little water; with or without food is generally fine
Capsules: Taking with food may reduce the chance of mild stomach upset
Administration Notes:
The demulcent (soothing) benefit comes from direct contact of the mucilage with the throat and upper respiratory tissues, so sipping tea slowly maximizes this local effect
Warm preparations are traditionally preferred for respiratory complaints, as the warmth itself helps soothe and the steam can provide additional comfort
For expectorant action, staying well hydrated alongside lungwort helps thin and mobilize mucus
External applications (poultices, washes) are applied directly to the affected skin area
Onset of Effects:
Soothing throat relief: Often felt during or shortly after drinking the tea
Expectorant and congestion relief: May develop over hours to a few days of regular use
Anti-inflammatory and antioxidant effects: Build with consistent use over the course of an illness
How Lungwort Works
Mechanisms of Action:
Demulcent action: The mucilage forms a soothing, protective gel-like layer over irritated mucous membranes in the throat and respiratory tract, reducing the irritation that triggers coughing
Expectorant effect: Saponins and other compounds help loosen and thin mucus, making it easier to clear from the airways
COX-2 inhibition: Phenolic acids (including rosmarinic, salvianolic, and lithospermic acids) inhibit cyclooxygenase-2, reducing the production of inflammatory mediators (a target shared with conventional anti-inflammatory drugs, though far milder)
Antioxidant scavenging: Polyphenols neutralize free radicals and reactive species, protecting tissues from oxidative damage; in laboratory studies, low concentrations protected DNA against peroxide-induced damage
Astringent action: Tannins tighten and tone inflamed tissue, which may help reduce excess secretions and soothe irritation
Tissue repair support: Allantoin promotes regeneration of cells in mucosal and skin tissues
Mild diuretic effect: Traditionally credited with increasing urine output, supporting the body's elimination of fluids and waste
Synergistic Supplements
Take WITH Lungwort:
Mullein: A classic respiratory pairing; another demulcent, expectorant herb for lung and bronchial support
Marshmallow root: Adds additional soothing mucilage for the throat and respiratory tract
Thyme: Antimicrobial and expectorant support for coughs and congestion
Licorice root: Soothes the throat and adds anti-inflammatory and expectorant action (use cautiously if you have high blood pressure)
Elecampane: Traditional expectorant for productive coughs and bronchial congestion
Plantain leaf: Complementary demulcent and respiratory soothing herb
Honey: Natural throat soother and mild antimicrobial; pairs well in tea
Vitamin C and zinc: General immune support during respiratory illness
Beneficial Combinations:
Respiratory tea blend: Lungwort + mullein + marshmallow root + thyme
Cough soother: Lungwort + licorice + honey
Bronchial support: Lungwort + elecampane + thyme + plantain
Immune season support: Lungwort tea + vitamin C + zinc + adequate hydration
Interactions & What NOT to Take
Use Caution With:
Medications metabolized by the liver: Because of the theoretical pyrrolizidine alkaloid (PA) concern in the Boraginaceae family, combining lungwort with other substances that stress the liver is not advised
Other hepatotoxic herbs or supplements: Avoid stacking lungwort with comfrey, coltsfoot, borage, or other PA-containing botanicals, as the cumulative load matters
Anticoagulant/antiplatelet medications: At high doses, the phenolic acid content might theoretically influence blood clotting; consult a pharmacist (this is a hypothetical, not well-documented, interaction)
Diuretic medications: Lungwort has mild diuretic activity, which could theoretically add to the effect of prescription diuretics
Alcohol and other liver stressors: Best minimized during periods of lungwort use as a general precaution
General Note:
Lungwort has not been extensively studied for drug interactions, so the interactions above are largely precautionary and based on its plant family and traditional properties rather than confirmed clinical evidence
The safest approach is to inform your healthcare provider of all supplements you take, especially if you are on chronic medication
Who Should Take Lungwort
Ideal Candidates:
Individuals experiencing a dry, irritating, or persistent cough
People with bronchial congestion or excess mucus they want to clear
Those dealing with seasonal colds, catarrh, or chest discomfort
Individuals seeking a traditional, gentle herbal approach to respiratory comfort
People who prefer demulcent (soothing) herbs for throat irritation
Those interested in herbal teas for short-term respiratory support
Individuals looking for a mild antioxidant and anti-inflammatory botanical
Specific Populations:
Adults seeking natural support during cold and cough season
People with occasional bronchial irritation from dry air or mild illness
Herbal tea enthusiasts wanting to add a traditional respiratory herb to their rotation
Those who tolerate borage-family plants well
Who Should AVOID or Use Caution
Should Avoid:
Pregnant women: Due to insufficient safety data and the pyrrolizidine alkaloid family concern, lungwort is not recommended during pregnancy
Breastfeeding women: Insufficient safety data; avoid as a precaution
People with liver disease or impaired liver function: The theoretical PA concern makes lungwort inadvisable for those with hepatic conditions
Individuals with known allergy to borage-family (Boraginaceae) plants: Risk of allergic reaction
Young children: Lack of safety data; consult a pediatric healthcare provider
Use Caution:
Anyone taking medications metabolized by the liver: Discuss with a healthcare provider
People on diuretics or anticoagulants: Monitor for additive effects
Those prone to allergic skin reactions: Lungwort can occasionally cause skin rashes or itching
Long-term users: Avoid continuous indefinite use; herbalists recommend defined treatment periods to limit cumulative PA exposure
Important:
Lungwort is supportive for mild respiratory complaints; it is NOT a treatment for serious lung conditions. Despite historical claims, there is no evidence it treats tuberculosis or other serious diseases, and it should never replace prescribed medical treatment for asthma, pneumonia, COPD, or any significant respiratory illness.
Benefits of Taking Lungwort
Traditional and Emerging Benefits:
Long history of use as a soothing respiratory herb across European folk medicine
Demulcent action provides real, noticeable comfort for irritated throats and dry coughs
Expectorant properties help loosen and clear mucus
Confirmed antioxidant capacity in laboratory studies
Demonstrated COX-2 inhibitory (anti-inflammatory) activity in research on the plant's phenolic fractions
DNA-protective effects against oxidative damage at lower concentrations in laboratory testing
Gentle, generally well-tolerated profile when used appropriately and short-term
Versatile use as tea, tincture, or topical application
Quality of Life Improvements:
Eased throat irritation and more comfortable breathing during minor illness
Reduced coughing frequency and intensity for irritating coughs
A warm, soothing herbal ritual during cold and cough season
A traditional, plant-based option for those who prefer gentle herbal support
Honest Evidence Note:
It is important to be clear: most of lungwort's benefits come from traditional use and laboratory studies, not large human clinical trials. The herb is best understood as a gentle, supportive remedy for minor respiratory discomfort rather than a proven treatment.
Potential Negatives & Side Effects
Common Side Effects (Generally Mild):
Mild gastrointestinal upset (nausea or slight cramping) if taken in excess
Allergic skin reactions such as rashes or itching, particularly in those sensitive to borage-family plants
Potential Concerns:
Pyrrolizidine alkaloids (PAs): This is the single most important safety consideration. Lungwort belongs to the Boraginaceae family, some members of which (like comfrey) contain PAs that can be harmful to the liver in sufficient quantities. The good news is that PA levels in Pulmonaria officinalis aerial parts (leaves) are generally considered very low to trace, often undetectable or negligible in recent analytical studies, and far lower than in high-PA plants. Still, the family association warrants caution, especially with long-term use.
Limited safety research: Lungwort has not been thoroughly studied in humans, so its complete safety profile, especially for long-term use, is not fully established
Dose-dependent effects: Laboratory research found that very high concentrations of lungwort extract could become genotoxic (potentially damaging to DNA), while lower concentrations were protective; this reinforces the principle that more is not better with this herb
Quality & Sourcing Issues:
Products labeled only as a "lungwort blend" without specifying the species may contain unrelated plants or be confused with lungmoss (the lichen)
Active compound levels vary with soil, harvest time, and processing, not just the appearance of the spotted leaves
Because lungwort is very sensitive to pollution, wild-harvested material should come from clean, unpolluted environments
Deficiency Symptoms
Note: Lungwort is not an essential nutrient, so there are no "deficiency symptoms." It is a traditional herbal remedy used situationally, not a nutrient the body requires. The conditions below indicate when someone might reach for lungwort's supportive properties:
Conditions That May Benefit From Lungwort:
Dry, irritating, or persistent coughs
Bronchial congestion or excess mucus
Sore, irritated throat
Chest discomfort during colds or seasonal illness
General respiratory irritation from dry air
Signs You Might Reach For Lungwort:
A nagging cough that disrupts sleep or daily activity
Throat irritation that soothing teas tend to help
Seasonal congestion you want to address with a gentle herbal approach
A preference for traditional demulcent herbs during minor respiratory illness
Toxicity Symptoms
Lungwort is generally considered safe at traditional doses for short-to-medium-term use, with no serious toxicity commonly reported in the traditional literature. The main toxicity concern is theoretical and relates to the pyrrolizidine alkaloid family association.
Potential Toxicity Concerns:
Liver toxicity (theoretical, from PAs): Prolonged or excessive use could, in theory, contribute to liver stress due to trace pyrrolizidine alkaloids found in some Boraginaceae plants. Symptoms of liver issues can include abdominal pain, jaundice (yellowing of skin or eyes), unusual fatigue, and dark urine; these would be cause to stop use and seek medical care immediately.
Genotoxicity at very high concentrations: Laboratory studies showed that extremely high concentrations of lungwort extract reduced cell viability and could damage DNA, while normal and low concentrations were protective; this is a strong argument against megadosing.
Gastrointestinal distress: Excessive intake may cause nausea or cramping.
Reducing Risk:
Use lungwort for defined periods rather than continuously
Stick to traditional doses; do not megadose
Choose products that specify the species (Pulmonaria officinalis) and ideally provide PA testing or come from reputable suppliers with third-party testing
Avoid combining with other PA-containing or liver-stressing herbs
Pet Safety Note:
Some Pulmonaria species are considered toxic to dogs and cats, potentially causing vomiting, diarrhea, lethargy, and loss of appetite. Keep lungwort products and plants away from pets.
Special Considerations
Form Selection:
Dried leaf tea: The most traditional form; best for delivering the soothing mucilage directly to the throat and respiratory tract; ideal for acute cough and throat comfort
Tincture: Convenient and concentrated; note that alcohol extraction emphasizes different compounds than water extraction
Capsules/powder: Convenient for those who dislike the taste of tea, but harder to verify quality and species
Topical preparations: Poultices and washes for external use on skin irritation, wounds, and eczema
Quality Indicators:
Botanical name clearly listed as Pulmonaria officinalis (not just "lungwort," and not Lobaria pulmonaria, the lichen)
Visible leaf spotting in dried whole-leaf material is a hallmark of genuine lungwort
Standardization to rosmarinic acid (3-5%) where available
Third-party testing for heavy metals, pesticides, and ideally pyrrolizidine alkaloid content
Certified organic or responsibly wild-crafted sourcing from clean environments
Reputable herb suppliers with transparent sourcing
The Lungwort vs. Lungmoss Confusion:
This is worth repeating: Pulmonaria officinalis (the flowering herb) and Lobaria pulmonaria (the lichen, also called lungmoss or tree lungwort) are completely different organisms that happen to share a common name
They contain different active compounds and have different (though overlapping) traditional uses
If a product matters to you for a specific reason, always verify the Latin botanical name
Sustainability and Sourcing:
Lungwort is highly sensitive to environmental pollution and tends to grow only in clean, old-growth forest habitats; its presence is actually used as an indicator of ecosystem health
This sensitivity means sourcing location matters for purity; material from polluted areas may carry contaminants
Research Status & Evidence Quality
Reasonable Evidence For:
Antioxidant activity (demonstrated across multiple laboratory assays)
COX-2 inhibition and anti-inflammatory potential (shown in studies of the plant's phenolic fractions in human blood plasma)
DNA-protective effects at lower concentrations (laboratory studies)
Demulcent/soothing properties (well supported by the known action of mucilage)
Traditional Use Only (Limited Scientific Confirmation):
Cough and bronchitis relief
Expectorant action
Diuretic and urinary tract support
Wound healing and skin applications
Immune support during respiratory illness
Significant Research Gaps:
No large, well-designed human clinical trials confirm lungwort's effectiveness for any specific condition
Standardized dosing has not been established due to insufficient data
Long-term safety, especially regarding pyrrolizidine alkaloid exposure, has not been thoroughly studied in humans
Most evidence is from traditional use, laboratory (in vitro) studies, and historical herbal practice
Research Outlook:
Recent laboratory studies on antioxidant and anti-inflammatory activity provide a foundation for future research
The plant remains understudied relative to its long history of use
Researchers have called for further investigation into its therapeutic potential for oxidative-stress-related conditions
Summary & Key Takeaways
Lungwort (Pulmonaria officinalis) is a gentle, traditional respiratory herb best known for soothing irritated throats and easing coughs through its high mucilage content. It offers expectorant, anti-inflammatory, and antioxidant properties, backed primarily by centuries of folk use and supportive laboratory studies rather than large human clinical trials. It is a quiet, understated herb that earns its place in respiratory tea blends and seasonal cough support.
Bottom Line: Lungwort is a mild, supportive remedy for minor respiratory discomfort, dry coughs, and throat irritation. It works best as a warm tea taken during periods of illness, and it pairs naturally with other respiratory herbs like mullein, marshmallow root, and thyme. It should be viewed as gentle, comfort-focused support, not a treatment for serious lung conditions.
Key Safety Points: The most important consideration is the pyrrolizidine alkaloid (PA) concern. While PA levels in lungwort leaves are generally very low to trace, the herb belongs to the same plant family as comfrey, so caution is warranted. Use lungwort for defined, short-to-medium-term periods rather than continuously, stick to traditional doses, and avoid it entirely if you are pregnant, breastfeeding, have liver disease, or are sensitive to borage-family plants. Do not megadose, since very high concentrations showed potential for DNA damage in laboratory studies.
Special Note: Be sure you are buying the right plant. Lungwort (Pulmonaria officinalis) is a flowering herb, while lungmoss or tree lungwort (Lobaria pulmonaria) is a lichen; the two are completely different organisms that share a common name. Always check the Latin botanical name on the label, choose products from reputable suppliers with third-party testing, and keep lungwort away from pets, as some Pulmonaria species are toxic to dogs and cats. As always, consult your healthcare provider before adding lungwort, especially if you take medications or have any underlying health condition.