Plantain Leaf (Plantago Major)
A common weed used as a soothing herb for coughs and the gut lining. One small randomized trial supports the cough use; the gut-lining claim has not been tested in humans.
Evidence last reviewed: August 2026
What the science says
- Cough in acute bronchitis Limited evidence
A double-blind randomized clinical trial found Plantago major reduced cough severity in acute bronchitis. It was a single small trial and needs replication before the effect can be relied on.
- Other clinical uses Limited evidence
A randomized open-label controlled trial of Plantago major seeds in diabetic nephropathy reported modest changes in kidney markers. The traditional use for the gut lining and mucous membranes has never been tested in a controlled human study.
Dosage & safety
Studied doseThe cough trial used a plantain syrup over roughly a week. Traditional leaf tea is 2–4 g up to three times daily, and capsules typically supply 500 mg.
SafetyWell tolerated as a food-grade herb. Allergic reactions are rare but possible, and it is in the same genus as psyllium, so the seeds are bulk-forming and need adequate fluid. Little data in pregnancy.
Scientific references
Where to buy
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Related in Gut health
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- Inulin (Prebiotic Fiber) Moderate evidence