Echinacea: 24+ trials, one famous "58%" — and still no verdict
- Claim
- ECHINACEA THE OPEN CASE
- Catch
- NO CLINICAL PAYOFF
- Verdict
- THE CATCH SCIENCE
Echinacea is one of the most tested cold herbs. A 2007 meta-analysis in The Lancet Infectious Diseases (Shah et al., 14 studies) reported echinacea decreased the odds of developing a cold by 58% (OR 0.42, mitigated by one large mixed-supplement trial) and shortened duration by 1.4 days — the most-shared echinacea stat on the internet. But the modern re-examination tempers that: a 2019 systematic review of randomized double-blind placebo-controlled trials (David & Cunningham, Complement Ther Med; PMID 31126553) found a prevention risk ratio of 0.78 (95% CI 0.68–0.88) while concluding that "whether this effect is clinically meaningful is debatable," and found no reliable effect on how long infections last. A 2014 NCCIH-commissioned assessment similarly concluded echinacea "hasn't been convincingly shown to be beneficial." The catch: echinacea spans nine species and countless preparations — roots, juices, teas, tinctures at wildly different doses — so trials can't be summed cleanly. It is generally safe for short-term adult use but has been linked to rashes in children. If you're already sick, don't expect echinacea to shorten it.
SOURCES
- Shah SA, et al. "Evaluation of echinacea for the prevention and treatment of the common cold: a meta-analysis," Lancet Infect Dis 2007;7(7):473-480. DOI: 10.1016/S1473-3099(07)70160-3
- David S, Cunningham R. "Echinacea for the prevention and treatment of upper respiratory tract infections: a systematic review and meta-analysis," 2019. PMID 31126553
- Karsch-Völk M, et al. Cochrane review, "Echinacea for preventing and treating the common cold" (2014)
- NCCIH, "The Common Cold and Complementary Health Approaches"
For information only, not medical advice. Talk to a doctor before giving children any herbal supplement.
