Mullein leaf is one of the oldest and most widely used botanicals in traditional herbal practice. Known scientifically as Verbascum thapsus, common mullein has been used across Europe, North Africa, Asia, and the Americas for centuries — primarily valued for its role in respiratory wellness traditions, its soothing character, and its versatility as a simple herbal tea.

Today, dried mullein leaf is one of the most searched herbal botanicals in North America, with a renewed interest among people looking for simple, single-ingredient herbs to incorporate into their daily wellness routines. Despite this, quality varies enormously between sellers — and most people brewing mullein leaf tea have never been told about the one step that makes or breaks the experience: proper straining.

This guide covers everything you need to know about mullein leaf — from its botanical character and traditional history to how to brew it properly, what the research says, and how to choose a quality product.

Shop our Organic Mullein Leaf — loose dried leaf, single ingredient, caffeine free, packaged fresh for tea and herbal use.

What Is Mullein Leaf?

Mullein (Verbascum thapsus) is a tall biennial plant in the Scrophulariaceae family, native to Europe, North Africa, and Western and Central Asia, and now naturalized across much of North America, Australia, and New Zealand. In its first growing season it forms a low rosette of large, distinctive velvety leaves — soft and almost flannel-like to the touch, which gives it common folk names like flannel plant, velvet plant, and Aaron's Rod. In its second season it sends up a tall central spike, sometimes reaching six feet or more, topped with clusters of small yellow flowers.

The leaves are the part most commonly used for dried herbal tea. They are harvested, dried, and used as a loose herb for steeping — producing a mild, earthy, subtly sweet infusion that has been part of herbal wellness traditions for thousands of years.

Mullein is not a supplement, stimulant, or flavored drink. It is a simple single-ingredient botanical — caffeine free, with no additives — that fits naturally into a loose-leaf herbal tea routine.

A Brief History of Mullein

Mullein's documented use spans at least two thousand years. Ancient Romans used the dried stalks as ceremonial torches, dipping them in tallow and lighting them for funeral processions — a use reflected in the old name candela regia, or "royal candle." The plant later earned significant recognition in European folk herbalism, particularly in Irish, Spanish, and English traditions, where it was commonly prepared as a tea for respiratory complaints including coughs, hoarseness, and bronchitis.

In the Americas, Native American tribes independently discovered and adopted mullein after its introduction from Europe, incorporating it into their own healing traditions. In the 19th and early 20th centuries, mullein preparations appeared in American pharmaceutical references as a traditional remedy for lung-related ailments. More recently, a 2021 systematic review of Spanish folk medicine documented mullein's widespread and consistent traditional use across multiple regions for respiratory and inflammatory conditions, representing centuries of accumulated use across very different cultures and medical traditions.

What's In Mullein Leaf? Key Natural Compounds

Mullein leaf's character as a traditional herbal tea comes from a combination of naturally occurring plant compounds that work together in ways researchers are still exploring. The main constituents identified in Verbascum thapsus leaf include:

Mucilage

Mullein leaf contains approximately 3% mucilage — a gelatinous, water-soluble substance that gives the plant its notably soft, velvety texture. In tea, mucilage dissolves into the infusion and has traditionally been associated with a soothing, coating effect on mucous membranes. This is why mullein has such a long traditional association with soothing the throat and respiratory passages.

Saponins

Mullein leaf contains triterpene saponins, which are plant compounds traditionally associated with expectorant activity — the ability to help the body thin and move mucus from the respiratory tract. The saponin content of mullein is part of what has made it a consistent choice in traditional herbal practice for cough and respiratory support.

Verbascoside (Acteoside)

Verbascoside is a phenylethanoid glycoside that has become one of the most studied compounds in the Verbascum genus. It has been investigated in laboratory settings for antioxidant, anti-inflammatory, antiviral, and antimicrobial properties. Verbascoside is considered one of the key bioactive markers of Verbascum thapsus quality, and analytical methods have been developed specifically to measure it in herbal preparations.

Flavonoids

Mullein leaf contains several flavonoids including luteolin and apigenin, which have been studied for their antioxidant and anti-inflammatory properties in laboratory research. Flavonoids contribute to the broader phytochemical profile that makes mullein leaf a botanically rich herb.

Tannins, Lignans, and Phenolic Acids

Mullein leaf also contains tannins, lignans, iridoid glycosides, and various phenolic acids. Together these contribute to the plant's complex chemistry, with a total of 40 or more identifiable bioactive compounds having been detected in the leaf in recent UPLC/MS analysis.

It's important to note that most of the research on these compounds has been conducted in laboratory or animal settings. Human clinical trials on mullein leaf specifically are limited, and this herb should not be viewed as a cure or treatment for any medical condition.

Traditional Uses of Mullein Leaf

Across cultures and centuries, mullein leaf has been used in several consistent ways:

Respiratory Wellness

This is mullein's most recognized traditional use. Historically it was prepared as a tea and drunk warm to soothe the throat, ease coughs, and support the lungs during respiratory illness. Both its mucilage (demulcent/soothing) and saponin (expectorant) content offer a traditional explanation for why mullein was so consistently chosen for this purpose across independent herbal traditions.

Traditional herbal references describe mullein as both a demulcent — an herb that soothes irritated tissue — and an expectorant — an herb that helps the body move mucus. This combination of properties is relatively unusual and likely explains mullein's long history in respiratory herbalism.

Throat Soothing

Mullein leaf tea has long been used as a warm beverage for throat irritation, hoarseness, and discomfort — a use consistent with its high mucilage content. Many people continue to brew it for this purpose today as part of their seasonal wellness routines.

Digestive Use

Traditional herbal references also note mullein's historical use for mild digestive discomfort, though this is less prominent in the modern literature than its respiratory associations.

What Modern Research Says

Modern scientific interest in mullein has grown meaningfully in recent years, though most published research remains at the laboratory and animal study stage rather than large human clinical trials.

Key areas of research interest include:

Antiviral properties — a 2007 laboratory study found mullein extract showed particularly strong activity against the influenza virus. A 2012 study also found activity against pseudorabies, a virus in the herpes family.

Anti-inflammatory activity — multiple laboratory studies have investigated mullein's flavonoids and verbascoside for anti-inflammatory effects, which may partly explain its traditional use for soothing irritated respiratory tissue.

Antimicrobial properties — laboratory studies have produced mixed results, with some early studies showing antimicrobial activity and more recent 2025 research finding limited response against specific bacteria, suggesting the antimicrobial picture is more nuanced than early results implied.

Antioxidant character — the flavonoid and phenolic content of mullein leaf has been studied for antioxidant properties in laboratory settings.

A 2021 systematic review of Spanish folk medicine published in the journal Biology found consistent documented use of mullein (Verbascum species) across multiple regional traditions for respiratory conditions — providing strong ethnobotanical evidence for the traditional use claims even where clinical human trial data is limited.

As with all traditional botanicals, it is important to understand that laboratory results and traditional use documentation are not the same as clinical proof of effectiveness in humans. Mullein tea is best understood as a traditional herbal beverage with a long history of wellness use, not a pharmaceutical treatment.

The Critical Straining Step Most People Skip

Mullein leaf has one important preparation requirement that most herbal guides fail to mention clearly enough: it must always be strained through a fine mesh strainer before drinking.

The reason is the tiny, naturally occurring hairs on mullein leaves — called trichomes. These microscopic hairs can pass through a standard tea infuser or loose-mesh strainer and, if swallowed, can irritate the throat or cause a tickling, scratchy sensation. This doesn't make mullein unsafe — it's a natural property of the plant — but skipping the fine straining step will undermine the entire experience.

Always use one of the following:

• A fine mesh strainer (the finer the better)
• An unbleached paper tea filter bag
• Cheesecloth folded to several layers
• A French press with a tight mesh

This is especially important if you're brewing mullein for someone with an already-irritated throat, where scratchy particles would be particularly unwelcome. For our tea filter bag recommendations, see our unbleached tea filter bags.

How to Brew Mullein Leaf Tea

Brewing mullein leaf tea is straightforward. The main variables are amount, water temperature, and steep time.

Basic Recipe

• 1 teaspoon dried mullein leaf per cup of hot water
• Water temperature: hot but not aggressively boiling (around 200°F / 93°C)
• Steep time: 10 to 15 minutes
• Always strain through a fine mesh strainer or tea filter bag before drinking

Mullein tea has a mild, earthy, lightly sweet flavor. It is gentle and unassertive — nothing like strongly flavored herbal teas. Some people find the mild flavor makes it easy to drink plain; others add a spoonful of raw honey, a slice of lemon, or a pinch of dried ginger to complement it.

Optional Additions

• Raw honey — classic pairing, naturally soothing
• Lemon — adds brightness to the mild earthy base
• Ginger — warming and complementary
• Thyme — a traditional pairing for respiratory wellness blends
• Peppermint — adds a cooling herbal note

For a full step-by-step brewing guide including timing and troubleshooting, see our dedicated article: How to Brew Mullein Leaf Tea Properly.

How to Choose Quality Dried Mullein Leaf

Quality varies significantly between suppliers of dried mullein leaf. Here's what to look for:

Look For:

• Certified organic where possible — ensures the leaf is free from pesticides and chemical treatments
• Whole or cut-and-sifted leaf (not powdered) — preserves the plant's natural qualities better for tea use
• Clean, grey-green color — faded, brown, or dusty-looking leaf indicates age or poor storage
• Fresh, herbaceous aroma — not flat, musty, or stale
• Clear botanical name on the label: Verbascum thapsus
• Minimal stems and debris

Avoid:

• Mullein sold without botanical name identification
• Leaf that appears heavily powdered or broken down
• Any product with added fillers, flavoring, or undisclosed blends

Our Organic Mullein Leaf is a single-ingredient, certified organic dried leaf — no additives, no fillers — packaged fresh for maximum aroma and potency.

Mullein Leaf Safety

Dried mullein leaf used as a herbal tea is generally well tolerated by most healthy adults. It has a long history of use and no well-documented serious side effects have been reported from normal tea use.

That said, as with all botanicals, a few considerations apply:

• Always strain properly to remove leaf trichomes, which can irritate the throat if swallowed
• People who are pregnant, breastfeeding, taking medication, or managing a chronic health condition should consult a healthcare provider before adding mullein to their routine
• Mullein is not a pharmaceutical treatment and should not be used as a substitute for medical care for respiratory illness
• If you notice any allergic reaction or unusual sensitivity, discontinue use

For a detailed safety guide including dosage guidance and who should exercise extra caution, see our dedicated article: Is Mullein Leaf Safe? Dosage, Side Effects & Who Should Consult a Doctor.

Everyday Ways to Use Mullein Leaf

For most people, mullein leaf is used in one or more of these simple ways:

As a Daily Herbal Tea

Brewed as a loose-leaf tea, strained carefully, and enjoyed plain or with honey and lemon. Many people drink a cup in the evening or during seasonal wellness routines.

As Part of an Herbal Blend

Mullein combines naturally with thyme, marshmallow root, peppermint, ginger, and licorice root for herbal wellness blends. Its mild flavor means it doesn't overwhelm other herbs when blended.

As a Home Apothecary Herb

Dried mullein leaf is a staple in many home herbal collections alongside other single-ingredient botanicals like lemon balm and rosehip, ready to brew as needed or blend into custom tea recipes.

Frequently Asked Questions About Mullein Leaf

What is mullein leaf used for?

Mullein leaf has been traditionally used for centuries as a herbal tea, particularly for respiratory wellness, soothing the throat, and supporting the body during seasonal illness. Modern research has explored its antioxidant, anti-inflammatory, antiviral, and expectorant properties in laboratory settings, though human clinical evidence remains limited.

What does mullein leaf tea taste like?

Mullein leaf tea is mild, earthy, and lightly sweet. It is much gentler in flavor than many herbal teas and doesn't have a strong bitter or grassy taste. Many people describe it as neutral and easy to drink, with a subtle warmth.

Why does mullein tea need to be strained so carefully?

Mullein leaves naturally have tiny hairs called trichomes that can irritate the throat if swallowed. Always strain mullein tea through a fine mesh strainer, paper tea filter, or cheesecloth before drinking. A standard loose infuser ball may not be fine enough.

How much mullein leaf should I use per cup?

A typical starting amount is 1 teaspoon of dried mullein leaf per cup (8 oz) of hot water, steeped 10 to 15 minutes. Adjust to taste on subsequent cups.

Can I drink mullein tea every day?

Many people use mullein leaf as part of a regular herbal tea routine. If you have a health condition, are pregnant or breastfeeding, or take medication, consult a healthcare provider before regular use.

Is mullein the same as common mullein?

Yes. "Common mullein" refers specifically to Verbascum thapsus, the most widely used medicinal species. There are over 300 species in the Verbascum genus, but Verbascum thapsus is the variety used in commercial herbal products.

What is the difference between mullein leaf and mullein flower?

Both the leaf and flower of Verbascum thapsus have been used traditionally. Most commercial herbal supplements use the flower; loose-leaf herbal tea products typically use the leaf. The leaf and flower contain overlapping but somewhat different chemical profiles. For tea, the leaf is the most commonly available form.

Can mullein be smoked?

Some people use dried mullein leaf in herbal smoking blends as an alternative to tobacco. Farmer Soul's mullein leaf is packaged and intended for use as a brewed herbal tea, not as a smoking product. For more on this topic, see our dedicated article: Mullein Leaf for Smoking vs. Tea: What You Should Know.

Does mullein interact with any medications?

There are no well-documented drug interactions for mullein leaf tea in normal culinary/herbal amounts. However, if you take any prescription medication, it's good practice to mention any herbal products you use regularly to your healthcare provider or pharmacist.

Related Farmer Soul Mullein Guides

How to Brew Mullein Leaf Tea Properly (Including the Straining Step Most People Skip)

Mullein Leaf Tea Recipes: Adding Honey, Lemon, Ginger & Other Herbs

Is Mullein Leaf Safe? Dosage, Side Effects & Who Should Consult a Doctor

Mullein Leaf History: From Ancient Rome to Modern Herbalism

Mullein vs. Thyme Tea: Two Traditional Herbal Teas for Respiratory Wellness

Mullein vs. Marshmallow Root: Which Demulcent Herb Is Right for You?

Mullein Leaf for Smoking vs. Tea: What You Should Know

What Is Mullein Leaf? A Botanical Guide to Verbascum thapsus

Shop Farmer Soul Mullein Leaf

Shop Organic Mullein Leaf — loose dried leaf, single ingredient, certified organic, caffeine free. Available in 3 oz, 6 oz, and 1 lb sizes.

Explore our full herbs and botanicals collection for single-ingredient herbal teas, spices, and home apothecary botanicals.

Sources & References

This article is for educational purposes only and is not intended to diagnose, treat, cure, or prevent any disease. Consult a qualified healthcare provider with questions about a medical condition or before using herbal products for therapeutic purposes.

Riaz, M., Zia-Ul-Haq, M., & Jaafar, H. Z. E. (2013). Common mullein, pharmacological and chemical aspects. Revista Brasileira de Farmacognosia, 23(6), 948–959.
https://doi.org/10.1590/s0102-695x2013000600012

Blanco-Salas, J., Hortigón-Vinagre, M. P., Morales-Jadán, D., & Ruiz-Téllez, T. (2021). Searching for scientific explanations for the uses of Spanish folk medicine: A review on the case of mullein (Verbascum, Scrophulariaceae). Biology, 10(7), 618.
https://doi.org/10.3390/biology10070618

National Center for Complementary and Integrative Health. "Mullein." Overview of traditional use, safety, and research.
https://www.nccih.nih.gov/health/mullein

WebMD Vitamins. "Mullein: Overview, Uses, Side Effects, Precautions, Interactions, Dosing and Reviews." Medically reviewed by Beth Johnston, BCPS, PharmD, September 2025.
https://www.webmd.com/vitamins/ai/ingredientmono-572/mullein

Mahmoud, D. S., et al. (2024). Bioassay-guided fractionation of Verbascum thapsus extract and its combination with polyvinyl alcohol in the form of electrospun nanofibrous membrane for efficient wound dressing application. PMC.
https://pmc.ncbi.nlm.nih.gov/articles/PMC11341329/