Does echinacea prevent or shorten colds?

Echinacea may reduce colds and antibiotic use in children. In adults, trials found little or no shorter-cold benefit. Here is what the studies show.

Published October 2026

Short answer

Limited evidence: child trials suggest fewer colds and less antibiotic use, while adult trials found little or no shorter-cold benefit. Evidence grade C (Limited). Several RCTs and a Cochrane review; downgraded for inconsistency between child and adult trials, varied preparations, and one company-linked trial.

Key takeaways

In nine trials of children with respiratory infections, echinacea shortened illness slightly and cut antibiotic use sharply [1].
A 2021 trial in children found fewer colds with echinacea than with vitamin C, though vitamin C is not a placebo and one author had ties to the company behind the product [2].
In adults, a Cochrane review of 24 trials found no clear benefit for treating colds [3].
Side effects were somewhat more common with echinacea in the child review, though mostly mild [1].

The short version

Echinacea may help prevent colds and cut antibiotic use in children, but the evidence is limited. Trials in children found fewer infections and fewer antibiotic courses [1][2]. Trials in adults found little or no shortening of colds [3][4].

What the studies show

A 2025 meta-analysis pooled nine randomised trials of Echinacea purpurea products in children with upper respiratory infections. Illness lasted slightly shorter, episodes were less frequent (risk ratio 0.81), and antibiotic use was far lower (risk ratio 0.18) [1].

In one trial of about 200 children aged 4 to 12, children taking an echinacea tablet had fewer respiratory infections than those taking vitamin C. Antibiotics were needed by 5.8% of the echinacea group and 15.3% of the vitamin C group [2].

In adults, a Cochrane review of 24 double-blind trials with 4,631 people found no clear benefit for treating colds. Of seven trials that measured how long colds lasted, only one showed a significant effect [3]. Prevention trials did not show a significant drop in the number of people catching colds, although a post hoc pooled estimate suggested a 10 to 20 per cent lower risk [3]. A 719-person trial of adults with new colds found the echinacea pills shortened illness by about half a day, a difference that was not statistically significant [4].

The nuances

Echinacea products differ in species, plant part and extract, so results do not carry across every product [3]. The child trials mostly used Echinacea purpurea; the 2021 trial used a freshly harvested alcoholic extract [2].

Belief may play a part. In a 719-person trial, people who expected echinacea to work had shorter, milder colds whether or not their pills contained echinacea [5].

What this means for you

The best evidence for echinacea is in children, and it is not strong enough to show that it reliably prevents colds. Talk to a doctor or pharmacist before using it, especially for a child or if you take medicines.

Go deeper

Echinacea — Echinacea may modestly reduce colds and antibiotic use in children, but adult trials found little or no shorter-cold benefit.

References

Efficacy and safety of Echinacea purpurea in treating upper respiratory infections and complications of otitis media in children: Systematic review and meta-analysis.. Clin Nutr ESPEN, 2025.
Echinacea reduces antibiotic usage in children through respiratory tract infection prevention: a randomized, blinded, controlled clinical trial.. Eur J Med Res, 2021.
Echinacea for preventing and treating the common cold.. Cochrane Database Syst Rev, 2014.
Echinacea for treating the common cold: a randomized trial.. Ann Intern Med, 2010.
Placebo effects and the common cold: a randomized controlled trial.. Ann Fam Med, 2011.