Upper respiratory tract infection (URTI)
Supplements studied for upper respiratory tract infection (URTI).
Overview
Several supplements show medium-level evidence for reducing upper respiratory tract infections. Vitamin D (14 studies) may lower croup risk in children when mothers took 2800 IU daily during late pregnancy. American Ginseng extract (Cold-FX) may reduce cold frequency and duration during influenza season when taken twice daily for months. Beta-Glucan from yeast may lower infection likelihood by about 65% and reduce symptom severity and duration.
Echinacea (10 studies) carries low ratings, though detailed summaries are not available here. Eleuthero has only been tested in combination products such as Kan Jang, with mixed results for cough relief. See the heatmap and evidence reviews below for evidence across nine supplements.
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SupplementDEX Database
9 supplements for , and rated at least stars. All purchase bands. No minimum star filter.
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