Supplement Scholar
Herb

Echinacea

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Echinacea. Native American herb used for URI prevention/duration reduction.

How it works. Alkylamides activate CB2 cannabinoid receptors and modulate innate immunity.

What the research supports. 1 graded claims. Strongest: Modest reduction in cold incidence and duration (moderate).

How much to take. Typical dose: 300–500 mg standardized × 3/d during illness.

Side effects and interactions. 2 medication interactions listed. No serious side effects listed at normal doses.

Stacking. Pairs well with Vitamin D3 + K2, Zinc. Avoid combining with Autoimmune disease (theoretical).

Common forms. Available as Standardized alkylamides.

Key studies. 8 studies cited. The strongest are listed with links to PubMed.

Community. Experiences from people who have tried Echinacea. Anecdotes are not medical advice.

Echinacea. Native American herb used for URI prevention/duration reduction.

Key compound: cichoric acidC22H18O12 · 474.4 g/mol

What it is

Native American herb used for URI prevention/duration reduction.

Also called

Echinacea purpurea

Food sources

Echinacea purpurea / angustifolia

Goals

Immune Function

How it works

Alkylamides activate CB2 cannabinoid receptors and modulate innate immunity.

Pathways

  • CB2 activation
  • Innate immune modulation

Effects

  • ↓Cold incidence (mild) decreases

What the research supports

Modest reduction in cold incidence and durationmoderate

Strong: consistent results across large trials or meta-analyses. Moderate: several trials, mostly positive. Limited: small or mixed studies. Preclinical: animal or cell research only.

Typical dose
300–500 mg standardized × 3/d during illness
TimingConsistent daily timing recommended; split larger doses if GI tolerance is a concern.
With foodEither with or without food.
Best formMost evidence is based on the standardized alkylamides form.
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Side effects & interactions

Common side effects

  • GI upset
  • Rash (Asteraceae allergy)

Medication interactions

Immunosuppressantsmoderate

Antagonistic.

CYP3A4 substratesminor

Mild inhibition.

Check any supplement–medication combination with your pharmacist before starting.

Combines with

Pairs well

  • Vitamin D3 + K2Foundational immune modulation.
  • ZincRequired cofactor for innate and adaptive immune function.

Avoid combining

  • Autoimmune disease (theoretical)Immune activation.

Common forms

  • Standardized alkylamides

Key studies

8 studies cited in total.

Echinacea for the prevention and treatment of the common cold ↗
Meta-analysis · Cochrane Database · 2014

Modest reduction in cold incidence and duration.

PubMed: Echinacea — Modest reduction in cold incidence and duration ↗
Systematic review · PubMed (NLM) · 2026

Opens current human and preclinical literature matching Echinacea and "Modest reduction in cold incidence and duration". Filter by RCT, meta-analysis, or year on the results page.

PubMed: Echinacea — randomized controlled trial ↗
Systematic review · PubMed (NLM) · 2026

Opens current human and preclinical literature matching Echinacea and "randomized controlled trial". Filter by RCT, meta-analysis, or year on the results page.

Discussion

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