How to Take Mullein Drops: Uses, Dosage & Safety

Mullein drops are a liquid botanical supplement made from the leaves or flowers of the mullein plant (Verbascum thapsus), and taking them is straightforward: most people place the recommended number of drops under the tongue or mix them into water and drink. The more interesting questions are what those drops actually do, how much to take, and whether they are safe. Mullein has a long history in folk medicine, particularly for respiratory complaints, but the clinical evidence behind it remains thinner than the plant’s famously fuzzy leaves.

What Mullein Drops Are Typically Used For

Mullein has been used in traditional medicine across Europe and parts of Asia and the Americas for centuries, most often for respiratory problems. Coughs, bronchitis, asthma, sore throat, and general congestion are the classic reasons people reach for it. A review of Spanish folk medicine practices found that mullein’s traditional reputation as a cough remedy lines up with its known mucilage content, which can soothe irritated mucous membranes in the throat and airways through a demulcent effect.¹ In plainer terms, the plant produces a slippery gel-like substance that coats irritated tissue and calms the urge to cough.

Beyond respiratory uses, mullein-containing preparations have been studied for ear pain. A clinical trial in children with acute ear infections compared herbal ear drops containing mullein (along with garlic, calendula, and other botanicals) to conventional anesthetic ear drops. Both groups showed a statistically significant improvement in ear pain scores over the study period, and the herbal combination performed comparably to the conventional drops.² That said, the herbal ear drops were a multi-ingredient formula, so it is impossible to credit mullein alone for the result.

Some people also use mullein drops for general immune support, mild urinary tract discomfort, or skin irritation, though these uses rest almost entirely on folk tradition rather than clinical trials. Lab studies have shown that mullein extracts possess antibacterial activity against several common pathogens, including Staphylococcus aureus and Escherichia coli, with the water extract showing particular promise.³ Killing bacteria in a petri dish is a far cry from curing an infection in a living person, so these lab results should be taken as interesting signals, not proof that mullein drops work as an antibiotic.

How to Take Mullein Drops

Mullein drops come in two main forms: tinctures (alcohol- or glycerin-based liquid extracts taken by mouth) and oil infusions (typically used as ear drops). The way you take them depends entirely on which type you have and what you are using them for.

Oral Tinctures

Mullein tinctures are the most common form sold as “mullein drops.” They are made by steeping mullein leaves or flowers in alcohol, vegetable glycerin, or a combination of both. To take them, you squeeze the dropper and place the liquid under your tongue, hold it there for about 30 seconds, and then swallow. This sublingual method allows some compounds to absorb through the thin tissue under the tongue. If you dislike the taste, which can be mildly bitter and earthy, mixing the drops into a small glass of water, juice, or tea works just as well. Absorption may be slightly slower through the digestive route, but for a supplement without precision dosing requirements, the difference is negligible.

Most people take mullein tinctures two to three times per day when dealing with an active cough or respiratory issue, and once daily if using it as a general supplement. You can take them with or without food. Some herbalists suggest taking them at the first sign of a cold and continuing for a week or two, rather than using them indefinitely.

Mullein Ear Oil

Mullein ear oil is a different product from the oral tincture. It is made by infusing mullein flowers in olive oil or another carrier oil, sometimes alongside garlic or calendula. To use it, you warm the bottle gently between your hands (never microwave it or heat it on a stove), tilt your head to the side, and place two to three drops into the affected ear. Stay tilted for a minute or so to let the oil settle in. A small cotton ball can help keep it in place. This is meant to soothe earache, not to treat the underlying infection. If you suspect an eardrum perforation or see discharge from the ear, skip the oil and see a doctor. Putting oil into an ear with a ruptured eardrum can make things worse.

Dosage Guidance

There is no standardized, clinically validated dose for mullein drops. No major regulatory body has set a recommended daily intake, and the handful of human studies that exist used multi-herb formulas rather than isolated mullein at a defined dose. This means dosage information comes primarily from product labels and traditional herbalist practice, not from controlled trials.

That said, most commercial mullein tinctures suggest roughly 1 to 2 milliliters (about 20 to 40 drops, depending on the dropper) taken two to three times daily for adults. Glycerin-based tinctures marketed for children typically suggest a lower volume, around half the adult amount, but these recommendations are based on convention rather than pediatric pharmacology data.

The concentration of the tincture matters more than the number of drops. A “1:5 tincture” (one part plant material to five parts solvent) is more dilute than a “1:2 tincture.” Product labels sometimes state the ratio; when they do not, you are essentially trusting the manufacturer to have produced something reasonable. Because mullein is not associated with acute toxicity at typical supplement doses, there is a fairly wide margin for variation, but more is not necessarily better. The active compounds in mullein, including polyphenols such as verbascoside and iridoid glycosides like aucubin and catalpol, occur in relatively small amounts in the plant.⁴ A high dose of tincture does not necessarily deliver a proportionally higher dose of the compounds that might be doing anything useful.

What Is Actually in Mullein Drops

Mullein is chemically complex, with several classes of compounds that researchers have identified and measured. Knowing what is in the drops helps explain both the potential benefits and the limitations of the supplement.

The plant contains mucilages (the gel-like polysaccharides responsible for the soothing throat-coating effect), saponins (which have mild expectorant properties and may help loosen mucus), iridoid glycosides such as aucubin and catalpol, and a range of polyphenols including verbascoside.⁴ Phytochemical analysis of mullein leaf extracts has identified a total phenolic content of about 124 mg gallic acid equivalent per gram of extract, along with six distinct phenylethanoid glycosides.⁵ Other analyses have confirmed the presence of several phenolic acids, including chlorogenic acid and caffeic acid, plus the flavonoid rutin.⁶

This chemical profile is worth mentioning because it explains why mullein keeps showing up in anti-inflammatory and antimicrobial research. Verbascoside, for instance, is a well-studied antioxidant and anti-inflammatory compound found in many plants. The same mullein leaf extract that showed high polyphenol content also demonstrated anti-inflammatory and anti-osteoarthritic effects in laboratory cell models.⁵ The gap between “reduces inflammation in a cell culture” and “reduces your inflammation when you take drops” is enormous, though, and no human trial has bridged it for mullein specifically.

Safety and Side Effects

Mullein is generally considered safe at typical supplement doses. It has a long history of human use, and serious adverse events linked to mullein consumption are essentially absent from the medical literature. That does not mean it is risk-free; it means the risks are poorly studied rather than well characterized.

The most common complaints people report are mild and digestive: occasional nausea or stomach upset, especially with alcohol-based tinctures taken on an empty stomach. If the alcohol content bothers you, look for a glycerin-based (“alcohol-free”) tincture, or dilute the drops in a full glass of water. Some people also experience skin irritation from handling the raw plant, thanks to the tiny hairs on mullein leaves. This is not typically an issue with processed tinctures, but if you are making your own infusion from fresh leaves, strain the liquid carefully through a fine cloth to remove the hairs, which can irritate the throat if swallowed.

Allergic reactions are possible, as with any plant product. Mullein belongs to the figwort family (Scrophulariaceae). If you have known allergies to plants in this family, or if you develop itching, swelling, or difficulty breathing after taking mullein drops, stop using them.

One potential interaction to be aware of: mullein saponins may theoretically interfere with the absorption of certain medications if taken at the same time. There is no strong clinical evidence documenting this interaction, but herbalists commonly advise spacing mullein drops at least two hours apart from prescription medications, particularly blood thinners and diabetes drugs, as a precaution. If you are on medication, mentioning mullein to your prescriber is a reasonable step.

Pregnancy, Breastfeeding, and Children

There are no published clinical studies evaluating the safety of mullein extract during pregnancy or breastfeeding. Traditional herbalists have sometimes included mullein in gentle preparations for pregnant people, but tradition is not the same as evidence. Without controlled trial data, most healthcare providers will advise caution, and many herbal product labels explicitly say to consult a healthcare professional before use during pregnancy.

For children, the evidence picture is slightly better only in the narrow case of herbal ear drops. The ear pain study mentioned earlier enrolled children between ages 6 and 18 and found no reported adverse events in the herbal-drop group.² But that was a topical oil applied to the ear, not an oral tincture, and the formula included several herbs beyond mullein. Giving an alcohol-based oral tincture to a young child is a separate question, and pediatricians often prefer to avoid alcohol-containing supplements in children regardless of the herb involved.

Contamination Risks and Choosing a Quality Product

Mullein grows readily in disturbed soils, roadsides, and former industrial sites, which raises a concern that most casual users never think about: the plant can accumulate heavy metals from contaminated soil. A study of plants growing near a former mercury mining area in Italy found that Verbascum thapsus had some of the highest mercury concentrations among the species tested, reaching over 54 mg per kilogram of plant tissue.⁷ That is an extreme case from heavily polluted ground, but it illustrates the principle: mullein grown in contaminated environments can carry contaminants into the finished product.

This makes sourcing matter. If you are buying mullein drops, you have little way of knowing where the plant material was grown unless the manufacturer provides that information. A few practical strategies can lower your risk:

Third-party testing: Look for products that display a certificate of analysis (COA) or a seal from an independent testing lab. These tests screen for heavy metals, pesticides, and microbial contamination.
Organic certification: While not a guarantee against all contamination, organic certification at minimum means the plants were not treated with synthetic pesticides and the growing site was inspected.
Extraction method: The label should tell you whether the tincture is alcohol-based or glycerin-based, the plant-to-solvent ratio if available, and which part of the plant was used (leaf, flower, or both). More transparent labels tend to correlate with more careful manufacturing.
Avoiding wildcrafted products from unknown sources: “Wildcrafted” means the plant was harvested from the wild rather than cultivated. This is not inherently bad, but without knowing the harvest site, you cannot assess soil contamination risk.

Supplements in the United States are regulated under the Dietary Supplement Health and Education Act, which means the FDA does not approve them for safety or effectiveness before they reach store shelves. The manufacturer is responsible for ensuring the product is safe, but enforcement is largely reactive. This regulatory framework makes the consumer’s own due diligence more important than it would be for a prescription drug.

When Mullein Drops Probably Will Not Help

Social media has driven a surge of interest in mullein, particularly in the form of “lung cleanse” tinctures marketed to smokers, former smokers, and people exposed to wildfire smoke. The marketing language often implies that mullein drops can detoxify the lungs or repair tissue damage. There is no evidence supporting either claim. Mullein’s demulcent properties may temporarily soothe an irritated throat and upper airway, but soothing is not the same as detoxifying or healing. Damaged lung tissue does not regenerate because you took herbal drops.

Similarly, while the antibacterial lab results are real, mullein drops are not a substitute for antibiotics when you have a diagnosed bacterial infection. Lab activity against Staphylococcus aureus in a test tube does not translate to clearing a staph infection in your body.³ The concentrations needed to kill bacteria in a dish are typically far higher than what oral supplementation could achieve in your bloodstream or tissues.

Ear drops are a partial exception here, since you are delivering the product directly to the site where you want it to work, and the clinical trial data on pain relief is at least modestly encouraging. But even there, the drops address pain, not the infection itself. A child with a bacterial ear infection still needs appropriate medical evaluation.

Making Your Own Mullein Drops at Home

Some people prefer to make their own mullein tincture or ear oil from fresh or dried plant material. If you go this route, a few details matter more than you might expect.

For a tincture, the standard folk method is to fill a glass jar loosely with dried mullein leaves or flowers, cover the plant material with 80-proof vodka or food-grade vegetable glycerin, seal the jar, and let it sit in a cool dark place for four to six weeks, shaking it every few days. After steeping, strain the liquid through cheesecloth and then through a coffee filter or fine muslin to remove the plant’s tiny irritating hairs. This hair-removal step is genuinely important. Mullein leaf hairs can cause throat irritation and contact dermatitis, and skipping the fine filtration is a common mistake in homemade preparations.

For ear oil, the process involves infusing dried mullein flowers in warm olive oil for two to three weeks (or gently warming the oil with the flowers in a double boiler for a few hours as a faster alternative). Again, strain thoroughly. The finished oil should be clear and free of plant debris. Store it in a dark glass bottle. Homemade infused oils do not contain preservatives, so they have a shorter shelf life than commercial products and should be discarded if they develop an off smell or cloudiness, which could indicate bacterial or fungal growth.

The main risk of homemade preparations is inconsistency. You have no way to measure the concentration of active compounds without analytical equipment, and the potency will vary depending on the plant material’s growing conditions, when it was harvested, and how it was dried. If you are foraging your own mullein, avoid plants growing near roads, agricultural fields that may have been sprayed, or former industrial land. Given mullein’s demonstrated ability to accumulate mercury from contaminated soil, the harvest site is not a trivial consideration.⁷

How Long to Use Mullein Drops

Most people use mullein drops as a short-term remedy during a cough, cold, or bout of congestion, typically for one to three weeks. There is no established maximum duration of use, but there is also no evidence supporting long-term continuous supplementation. The traditional use pattern was episodic: take it when you are sick, stop when you feel better. Without long-term safety data, that approach seems reasonable.

If you have been taking mullein drops for several weeks and your symptoms have not improved, the drops are probably not going to be the thing that fixes the problem. Persistent cough, recurring ear pain, or breathing difficulty that does not resolve warrants medical evaluation, not a higher dose of herbal tincture. Mullein drops occupy a reasonable place as a mild, low-risk comfort measure for minor respiratory irritation. They are not a treatment plan for chronic or serious conditions.