Mullein is a tall, fuzzy-leafed plant used primarily as a natural remedy for respiratory problems like coughs, bronchitis, and congestion. Its flowers and leaves have been used for centuries across many cultures to soothe irritated airways, loosen mucus, and calm ear pain. Today you can find it sold as dried leaf tea, tinctures, capsules, and infused oils, and it remains one of the more popular herbal remedies for chest and throat complaints.
Respiratory Relief and Cough Support
The most common use of mullein is as an expectorant, meaning it helps thin mucus in the lungs and airways so you can cough it up more easily. When thick mucus stays trapped in the lungs, it can block airflow and create a breeding ground for infection. Mullein’s leaves and flowers contain a substance called mucilage, a slippery gel-like compound that coats the moist lining of your respiratory tract and reduces inflammation. This combination of loosening mucus while soothing irritated tissue is why mullein has long been a go-to herb for productive coughs, bronchitis, and general chest congestion.
Traditionally, mullein was also used to treat tuberculosis, though modern treatment for that disease relies on prescription antibiotics. For everyday upper respiratory issues like a lingering cold or seasonal congestion, mullein tea or tincture is the most popular form.
Ear Pain and Infections
Mullein flower oil, often combined with garlic, St. John’s wort, and calendula, is a traditional remedy for the pain of middle ear infections in children. Two double-blind trials involving more than 250 children compared this type of herbal ear drop against a standard anesthetic ear drop product. Both treatments reduced pain to the same degree.
There’s an important caveat: herbal ear drops likely don’t treat the infection itself, because the eardrum forms a physical barrier between the oil in the ear canal and the infection behind it. They appear to work mainly as pain relief. You should also never put oil into an ear if there’s any chance the eardrum has ruptured, since liquid passing through a hole in the eardrum can cause serious complications.
Antibacterial and Antiviral Properties
Lab studies have shown that mullein extracts can fight several types of bacteria and viruses. Leaf extracts demonstrated antibacterial activity ranging from 50 to 62 percent against tested strains, including bacteria commonly involved in pneumonia and respiratory infections. Flower extracts were slightly less potent, with 42 to 54 percent activity against the same organisms.
On the antiviral side, mullein flower extract showed significant activity against a human coronavirus strain (not the one that causes COVID-19, but a related cold-causing virus), reducing viral levels by roughly eight-fold compared to controls. Leaf extract, meanwhile, performed better against hepatitis C virus in lab testing. These are test-tube results, not clinical trials in people, so it’s not yet clear how well these effects translate to drinking mullein tea or taking a supplement. Importantly, both leaf and flower extracts showed very low toxicity to human cells in the same studies, with less than 10 percent cytotoxic activity.
Skin and Topical Applications
Mullein leaves have a long history of topical use. Poultices made from the leaves have been applied to burns, boils, hemorrhoids, and ulcers. One traditional preparation involves boiling the leaves with lard to create a wound ointment. Another method combines mullein with flaxseed meal for a poultice placed over scalds and boils to draw them to a head.
More recently, a mullein-based liquid extract was tested on several people with stubborn skin conditions. One man with prurigo, a chronic inflammatory condition that causes weeping sores, applied the extract twice daily for two weeks. His arms cleared completely and sores on his head improved by about 75 percent. In another case, a woman with a persistent rash caused by a metal bracelet, one that hadn’t responded to dermatological treatment, saw her rash disappear after 12 days of twice-daily application. A third person with a chronic neck rash that prescription creams hadn’t improved was rash-free after two weeks of use. These are individual case reports rather than large controlled studies, but they suggest mullein has real potential for inflammatory skin conditions.
How to Prepare Mullein Tea
The simplest way to use mullein is as a tea. Place about one tablespoon of dried mullein leaves in a cup and pour boiling water over them. Let it steep for 10 to 15 minutes. The crucial step is straining: mullein leaves are covered in tiny hairs that can irritate your throat if you drink them. Always pour the tea through a fine-mesh strainer or, better yet, a layer of cheesecloth to catch those fine fibers. For a larger batch, use four to eight teaspoons of dried leaves per liter of water, adjusting to your taste preference.
Mullein tea has a mild, slightly sweet flavor that most people find pleasant on its own, though honey is a common addition, especially when using the tea for a sore throat or cough.
Safety Considerations
Mullein leaves and flowers are generally considered safe for most adults when used as a tea or supplement. The seeds, however, are a different story. Mullein seeds contain rotenone, a compound that is toxic, and they should never be consumed.
There is not enough reliable safety data on mullein use during pregnancy or breastfeeding, so most sources recommend avoiding it during those times. One environmental concern worth noting: mullein is efficient at absorbing heavy metals like zinc, lead, chromium, and nickel from contaminated soil. If you’re harvesting wild mullein, the location matters. Plants growing near roadsides, industrial sites, or areas with known soil contamination could contain concentrated heavy metals. Buying mullein from a reputable herb supplier is the safer option if you’re unsure about the growing conditions.