Pelargonium sidoides (standardized)
German standardized extract of South African geranium root — the most clinically proven herbal cold/bronchitis remedy in Europe. Multiple randomized controlled trials show 1-2 day reduction in bronchitis symptoms. Child-safe. Brand names: Umcka, Kaloba.
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Blood thinners (coumarin derivatives).
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GI upset (uncommon). Very well tolerated.
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