Supplement analysis backed by scientific evidence · PT

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Moderate evidenceImmunity

Ivy Leaf Extract

Ivy leaf dry extract is one of the few cough herbals with actual placebo-controlled trial data, and it modestly speeds recovery from acute cough — roughly cutting three days of illness down to two. The catch: essentially all the good trials come from the manufacturer of the leading extract.

What the science says

  • Reduces cough severity in acute respiratory infection Moderate evidence

    An individual-patient meta-analysis of two double-blind placebo-controlled trials (390 patients, 7 days of treatment) found Bronchitis Severity Score reductions of 8.6 with the EA 575 ivy extract versus 6.2 with placebo. Put differently, placebo took 7 days to reach the improvement ivy reached in 4. Both trials were sponsored by the extract's manufacturer and the authors report financial ties, so independent confirmation is still owed.

  • Increases the proportion of patients who become cough-free Moderate evidence

    In the same pooled analysis, 18.1% of the ivy group versus 9.3% of placebo were cough-free at the end of 7 days' treatment, and 56.2% versus 25.6% by the end of follow-up. That is a meaningful difference for a symptomatic remedy, though acute cough resolves on its own regardless.

  • Safe and effective in children Moderate evidence

    Ivy leaf syrups are among the most-used pediatric cough products in Germany and large observational cohorts plus expert reviews report good tolerability in children from age 1-2 upward. The pediatric efficacy evidence is mostly non-randomized (cohorts and surveys) rather than placebo-controlled, so it is weaker than the adult data.

  • Acts as a bronchodilator via beta-2 receptors Limited evidence

    The saponin alpha-hederin inhibits internalization of beta-2 adrenergic receptors on airway cells, which would increase surfactant release and relax bronchial muscle — an elegant and well-characterized in-vitro mechanism. It has not been demonstrated to produce measurable bronchodilation (e.g. FEV1 gains) in humans, and ivy is not a substitute for an inhaler.

Dosage & safety

Studied doseAdults: 5-7.5 mL of standard ivy leaf syrup three times daily, or dry extract tablets supplying roughly 35 mg of extract (typically 5-7.5:1, ethanol 30%) three times daily. Children's doses are weight- and age-scaled per product label, usually 2.5-5 mL two to three times daily. Trials ran 7 days; there is no reason to take it beyond the acute illness.
SafetyGenerally well tolerated, with adverse event rates equal to placebo in trials. Gastrointestinal upset (nausea, diarrhoea) is the most common complaint and is partly due to sorbitol in syrups. Allergic reactions including urticaria and, rarely, breathing difficulty occur; ivy is a known contact allergen. Do not combine with cough suppressants for a productive cough. Syrups may contain sorbitol (avoid in fructose intolerance) and some contain ethanol. Not a treatment for asthma exacerbation, pneumonia, or any cough lasting more than 2-3 weeks — those need medical assessment.

Scientific references

Where to buy

Nature's Way, Bronchial Soothe®, Ivy Leaf Extract Syrup, Ages 6+, 4 fl oz (120 ml)

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