Lungwort: Side Effects and Safety at a Glance

Lungwort has a reputation as a mild, well-tolerated herb — and that reputation is well-earned. Still, search for lungwort supplements and you'll keep running into the same term: pyrrolizidine alkaloids, or PAs for short. It sounds more alarming than it actually is with a properly tested product. Here's the honest breakdown: what's real about the concern, what actually matters when you buy, and how to take lungwort without a guilty conscience.

What Is Lungwort?

Lungwort (botanically Pulmonaria officinalis) is a native wild perennial from the borage family (Boraginaceae) — recognizable by its white-spotted, roughly haired leaves and flowers that shift from pink to blue. Despite the name, it has nothing to do with the lung in a medical sense; it comes from the centuries-old doctrine of signatures, where the pale spots on the leaves were once thought to resemble lung tissue — a symbolic observation, not scientific proof of any effect. The parts used are those growing above ground, usually as a powder or extract in capsules. Traditionally, lungwort has a firm place in herbal blends for the throat and airways, thanks to mucilage that coats the mucous membranes, plus silica, flavonoids, and tannins. There's no approved EU health claim for lungwort itself — what follows is about origin and tradition, not a promise of effect.

Why Lungwort Can Cause Side Effects at All

Most people tolerate lungwort itself just fine. The mucilage and tannins can, in rare cases, cause mild stomach upset if you take a very high dose — for most people, that's the extent of the direct side effects.

The real safety point lies elsewhere: lungwort belongs to the borage family (Boraginaceae), and this plant family can produce pyrrolizidine alkaloids (PAs) — natural compounds some plants make as a defense against being eaten. PAs aren't a lungwort-specific problem; they affect entire plant families, and the same caution applies to certain herbal teas, borage, or honey from some regions. In higher amounts and with sustained intake, PAs are suspected of putting a strain on the liver, and some individual compounds have also shown genotoxic potential in animal studies. That's why the general rule for PAs is: as little as possible, not “fine up to some threshold.” For context, the few documented cases of severe poisoning worldwide almost always trace back to heavily contaminated grain or unregulated wild-herb teas — not to normal, tested supplements sold through retail.

For you as a buyer, that comes down to one thing above all: product quality is what matters. Reputable manufacturers have every batch independently lab-tested for PAs before it goes on sale — and since July 2022, EU law has also set a legal maximum of 400 micrograms of PA per kilogram for herbal food supplements sold on the market. Lungwort picked wild at the roadside has never gone through that check; a properly tested capsule product has. That legal requirement is still fairly recent, which is all the more reason to actively ask for a lab report if a supplier doesn't offer one upfront.

Who Does This Actually Matter For?

For most healthy adults taking a tested lungwort product in cycles, PAs aren't a practical concern — the amounts in a lab-tested capsule blend sit in the microgram range, far below the levels involved in historical poisoning cases linked to heavily contaminated wild herbs or teas.

You should look a little closer if you're planning to take lungwort continuously for months at a time rather than occasionally, or if you're combining several PA-relevant herbs at once — say, various herbal teas on top of a capsule product — since the total amount adds up. General caution around PA-relevant plants also makes sense if you have an existing liver condition or regularly take medication processed by the liver — and that applies to the whole plant family, not just lungwort. For children, pregnant women, and breastfeeding mothers, there isn't enough safety data, so the rule here is: only after talking to a doctor or midwife.

It's a non-issue, on the other hand, for anyone simply looking for a traditional herb for their cold-season routine who chooses a product backed by a lab report.

Intake & Dosage

Stick to the dosage stated on your product's packaging — it varies depending on extract concentration and formulation, and there's no universal lungwort dose because there's no single standardized monograph. Take capsules with enough liquid, ideally with a meal if your stomach tends to be sensitive. With a multi-herb cold-season blend, spreading the intake across the day often makes sense if the label calls for it — that way your body gets small, regular amounts instead of one large dose.

Because the general rule for PA intake is to keep it as low as reasonably achievable, taking lungwort in cycles is the better choice over continuous, uninterrupted use: take your product for a few weeks, then pause for one to two weeks before starting again. This isn't a strict rule, just the pragmatic, conservative approach.

Skip self-foraged or loose, untested lungwort — without lab analysis, you don't know its actual PA content, and mixing it up with similar-looking wild plants is an additional risk. For children and during pregnancy and breastfeeding, only take it after checking with a doctor or midwife, never on your own.

What to Look for When You Buy

With lungwort, your purchase decision is a safety decision. Here's what to look for:

• PA-tested batch: Every batch should be independently lab-tested for pyrrolizidine alkaloids. Ask the manufacturer for the current lab report — a supplier with nothing to hide will show it to you without hesitation.
• Controlled cultivation instead of wild harvesting: Raw material from defined cultivation can be traced and specifically controlled; wild-harvested material can't.
• Lungwort listed first on the ingredients list: Ingredients are listed in descending order by amount. If lungwort is at the top, it's a core ingredient, not just a token amount.
• Transparent origin: Production in Germany or the EU means tighter controls than imported goods from outside the EU.
• Sensible companion nutrients: Vitamin C, B2, or selenium make sense because they contribute their own approved effect — for example, to the normal function of the immune system.
• Capsule shell without unnecessary additives: Plant-based shells made from hydroxypropyl methylcellulose are vegan — also check that carrageenan and PEG are left out.
• Price per daily dose, not per package: Convert the package price to a daily-dose price before comparing — a large jar might look cheap but can cost more per serving than a smaller one with a higher concentration.

The Honest Bottom Line

The PA caution around borage-family plants is real, but it primarily concerns uncontrolled sources: heavily contaminated wild material, unregulated herbal teas, or supplements without lab testing. For an EU-made, batch-tested lungwort product that you take in cycles rather than continuously, the risk is low based on current knowledge.

What we're not claiming: that PAs are harmless in absolutely any amount — no safe threshold can be set for cancer risk, which is why the general rule is “as little as necessary.” And lungwort itself has no approved proof of effect either, only traditional use. Take it for what it is: a traditional herb with a good safety profile as long as you pay attention to origin and lab testing — no reason for concern, but also no free pass for unlimited amounts.

Matching Products From Scheunengut

Our Lungwort Complex combines lungwort as the main ingredient with 13 other herbs like sage, peppermint, and Baikal skullcap, plus vitamin C, B2, and selenium — made in Germany and lab-tested before it reaches you. The batch testing that matters most for PA safety is standard practice for us, not the exception. You can request the current lab report at any time.

Frequently Asked Questions (FAQ)

What Side Effects Can Lungwort Cause?

Direct side effects are rare — occasionally mild stomach discomfort at very high doses. The real safety consideration isn't the plant itself but possible pyrrolizidine alkaloids (PAs), which can occur across the borage plant family — which is why batch lab testing matters most when it comes to lungwort.

Does Lungwort Contain Pyrrolizidine Alkaloids (PAs)?

Lungwort belongs to the borage family (Boraginaceae), which can produce PAs — that's a trait of the family, not proof of high levels in every individual plant or product. An independent lab report shows you the actual content of your specific product.

Is Lungwort Harmful to the Liver?

With a tested, batch-controlled product at the usual dose, that's not expected based on current knowledge. PAs in high, uncontrolled amounts — for example, from heavily contaminated wild material — can put a strain on the liver, which is why lab testing and cyclical rather than continuous use are the key safety factors.

How Long Can I Take Lungwort Continuously?

Taking it in cycles of a few weeks followed by a break is the more conservative choice compared to ongoing use without interruption. This isn't a strict upper limit, just a practical way of applying the principle of using PA-relevant plants as sparingly as makes sense.

Is Lungwort Safe During Pregnancy and Breastfeeding?

There isn't enough safety data for this, so taking it on your own during this time isn't recommended. Talk to your doctor or midwife before taking it.

What Should I Look for When Buying Lungwort Products?

Most important is independent batch lab testing for PAs, along with EU manufacturing, cultivated rather than wild-harvested material, and lungwort listed first on the ingredients list. If in doubt, actively ask for the lab report.

Is Self-Foraged Lungwort Safer Than a Supplement?

Actually, the opposite is more likely true: without lab analysis, you don't know the actual PA content, and mixing it up with similar-looking wild plants is an added risk. A tested capsule product with a lab report offers considerably more safety than foraging it yourself.