Herbs (Global Traditional) · European
Plaintain (Plantago lanceolata) (Plantago lanceolata)
Moderate Evidencebotanical
Hermetica Superfood Encyclopedia
Plantain (Plantago lanceolata) contains mucilage polysaccharides and iridoid glycosides that provide respiratory and anti-inflammatory effects. The mucilage creates a protective coating on respiratory tissues while iridoids reduce inflammatory signaling pathways.
Plantago lanceolata (ribwort plantain) is a perennial herb native to Europe and Asia, now widely distributed in temperate grasslands worldwide. The medicinal parts are primarily the leaves harvested from the rosette-forming plant, processed through aqueous, ethanolic (28%), or solvent-based extraction methods to yield crude extracts or lyophilized forms.
Clinical evidence is limited, with the European Medicines Agency noting no well-established RCTs have been performed. The main clinical data comes from an observational study of 593 patients using a cough syrup containing 20g/100ml P. lanceolata extract. In vitro studies (PMID: 37224247) demonstrate cytotoxic effects on cancer cell lines with IC50 values of 100-400 µg/ml.
Clinical dosing data is sparse. The observational cough study used syrup containing 20g P. lanceolata extract per 100ml over 3-14 days (specific daily intake not quantified). No standardized extract dosages from RCTs are available. Traditional preparations use unstandardized leaf extracts. Consult a healthcare provider before starting any new supplement.
Plantago lanceolata (Ribwort Plantain) leaves per 100 g fresh weight: Water ~80–85 g; Protein ~2.0–2.5 g; Dietary fiber ~3.5–5.0 g; Fat ~0.3–0.5 g; Carbohydrates ~8–12 g. Key bioactive compounds: Iridoid glycosides — aucubin (~0.3–1.5% dry weight) and catalpol (~0.3–1.2% dry weight), which contribute to anti-inflammatory and antimicrobial activity. Phenylpropanoid glycosides — acteoside (verbascoside, ~1.0–3.5% dry weight) and plantamajoside (~0.5–2.0% dry weight), potent antioxidants with ORAC values comparable to rosmarinic acid. Flavonoids — luteolin-7-O-glucoside and apigenin-7-O-glucoside (combined ~0.2–0.8% dry weight). Mucilage polysaccharides — ~2–6% dry weight (primarily rhamnogalacturonan and arabinogalactan), responsible for demulcent/soothing effects on respiratory mucosa. Tannins — ~4–6% dry weight (condensed type). Minerals: Calcium ~170–250 mg/100 g dry weight; Potassium ~300–500 mg/100 g dry weight; Iron ~5–10 mg/100 g dry weight; Zinc ~2–5 mg/100 g dry weight; Magnesium ~80–150 mg/100 g dry weight; Silicic acid (trace amounts). Vitamins: Vitamin C ~15–35 mg/100 g fresh weight; Vitamin A (as beta-carotene) ~3.5–5.0 mg/100 g fresh weight; Vitamin K ~50–80 µg/100 g fresh weight (estimated from related Plantago spp.). Organic acids: chlorogenic acid and caffeic acid (~0.1–0.3% dry weight). Bioavailability notes: Aucubin is a prodrug activated by β-glucosidase hydrolysis to aucubigenin (the active aglycone), which occurs during tissue damage or gut metabolism; oral bioavailability of intact aucubin is moderate (~20–40% absorption in rodent models). Acteoside (verbascoside) has relatively low oral bioavailability (~5–15%) due to extensive hydrolysis by gut esterases and phase II conjugation, though its metabolites (hydroxytyrosol, caffeic acid) retain antioxidant activity. Mucilage polysaccharides are not systemically absorbed but exert local effects on gastrointestinal and respiratory mucosa, forming a protective gel layer. Mineral bioavailability may be moderately reduced by tannin content (~4–6%), which can chelate iron and zinc; consuming with vitamin C–rich foods may partially offset this effect.
Plantain's mucilage polysaccharides form protective films on respiratory epithelium, reducing irritation and cough reflexes. Iridoid glycosides like aucubin inhibit cyclooxygenase and lipoxygenase enzymes, suppressing pro-inflammatory prostaglandin and leukotriene synthesis. Phenolic compounds provide additional antioxidant activity by scavenging reactive oxygen species.
An observational study of 593 patients demonstrated 67% reduction in cough intensity and 66% reduction in frequency after 3-14 days of plantain treatment. In vitro HET-CAM testing confirmed anti-inflammatory activity of leaf extracts at high concentrations. Current evidence remains preliminary, with most research limited to observational studies and laboratory models rather than randomized controlled trials.
Plantain is generally well-tolerated with minimal reported adverse effects in clinical observations. Theoretical concerns exist regarding interactions with anticoagulant medications due to potential effects on platelet aggregation. Allergic reactions may occur in individuals sensitive to Plantaginaceae family plants. Safety during pregnancy and lactation has not been established through controlled studies.
