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Immunity

Echinacea

Herbal extract used for short-term cold prevention and symptom relief, with mixed clinical results and generally mild side effects.

Echinacea
42
score
C
evidence
Caution
risk

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This supplement may interact with medications, medical conditions or sensitive populations. Review safety before use.

Quick Take

Worth a short trial only if you want to test it; evidence for cold prevention and treatment is mixed and benefits are modest.

Echinacea is a group of flowering plants in the daisy family, with Echinacea purpurea and Echinacea angustifolia most commonly used in supplements. It contains alkamides, glycoproteins, and polysaccharides that may interact with immune cells. Human studies show mixed results for preventing or shortening upper respiratory infections, with some trials finding modest changes in cold frequency, symptom severity, or duration and others finding no benefit. It may also influence inflammatory markers in laboratory settings. People most likely to benefit are those looking for a short-term trial during

Potential benefits

01
May shorten cold duration
02
May reduce cold incidence
03
May reduce cold symptom severity
04
May lower inflammation

Protocol

Amount
300-500 mg standardized extract
Frequency
2-3 times daily
When
With meals; if using for a cold, start at the first sign of symptoms.

Onset Time

Acute if started at symptom onset; 1-2 weeks for prevention.

Who Should Consider

Adults wanting a short cold-season trial
People with frequent colds
People who start supplements at first symptoms
Those who prefer herbal options

How It Works

Echinacea alkamides and polysaccharides may activate macrophages, neutrophils, and natural killer cells, and modulate cytokine release including TNF-α and interleukins. These immunomodulatory effects are observed in vitro and in some human blood samples, but their clinical relevance for preventing infections remains uncertain.

Updated 5/19/2026

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