Supplement analysis backed by scientific evidence · PT

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Limited evidenceImmunity

Mullein

Mullein is a traditional respiratory herb that has essentially never been tested as an oral supplement in a controlled human trial. Its best-known clinical data come from a multi-herb ear drop where mullein was one of four ingredients, so nothing can be attributed to mullein itself.

What the science says

  • Relieves cough and bronchial congestion Limited evidence

    There are zero randomized placebo-controlled trials of oral mullein leaf or flower for cough, bronchitis, or asthma. The rationale rests on mucilage content and saponins with in-vitro expectorant-type activity. Popular claims that mullein 'clears the lungs' of smoking or vaping damage have no human data of any kind behind them.

  • Reduces ear pain in children (as part of a herbal ear drop) Limited evidence

    Two randomized trials of a naturopathic olive-oil ear drop containing mullein plus garlic, calendula, and St John's wort found pain reduction comparable to or better than anesthetic ear drops in children with acute otitis media (the larger trial randomized 171 children over 3 days). Mullein was one of four botanicals in an oily vehicle that is itself soothing, so the trials tell you the product may help, not that mullein does.

  • Antibacterial and antiviral activity Limited evidence

    Verbascum thapsus extracts and its phenylethanoid glycoside verbascoside inhibit bacteria and influenza virus in culture, typically at concentrations far above anything achievable in blood after drinking tea. No human infection outcome has ever been measured.

Dosage & safety

Studied doseTraditional use: 1.5-2 g dried leaf or flower as an infusion, 3 times daily; tinctures 1:5 at 2-4 mL three times daily. Capsules on the market usually supply 500-1000 mg leaf powder. None of these doses derive from clinical trials. Always strain mullein tea through fine cloth or a paper filter.
SafetyThe leaf is covered in fine hairs that cause throat and mouth irritation if not filtered out of tea — this is the single most common complaint. Contact dermatitis is reported in sensitive people. Mullein seeds contain saponins with piscicidal (fish-stunning) activity and should not be consumed; use leaf and flower only. Safety in pregnancy and lactation has not been evaluated. Anyone treating an ear infection should be aware that herbal drops are contraindicated with a perforated eardrum and that pain relief is not the same as treating the infection.

Scientific references

Where to buy

Nature's Answer, Mullein Leaf, Fluid Extract, Alcohol-Free, 1 fl oz (30 ml)

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