Strong evidenceherb
Garlic for Frequent Colds
Allicin stimulates immune cell function and reduces cold incidence through antimicrobial and immunomodulatory effects.
How strong is the research?
Strong evidence
Based on a randomised controlled trial (RCT) — the gold standard for establishing cause and effect.
Research source
SourceJosling P · Adv Ther 2001How much to take
180–360 mg
Prophylactic use reduces cold incidence by ~60%. Use aged extract for better tolerability.