Echinacea
Also known as: Echinacea purpurea, Echinacea angustifolia, Echinacea pallida, Purple coneflower
Systematic reviews and meta-analyses report a large number of randomised trials but substantial heterogeneity between products and study designs. Overall evidence is inconsistent: some trials report benefit for prevention or shorter duration of colds, while others do not, and reviewers note variable quality and preparation differences.
Last reviewed: 2026-10-14 · 5 indexed studies
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Overview
Echinacea is a group of North American flowering plants used in supplement form, commonly for prevention or treatment of the common cold. Clinical research comprises many heterogeneous trials and systematic reviews that examine different species, plant parts and preparations with mixed results.
Mechanism & Function
Mechanism of Action
Proposed actions include modulation of immune responses; clinical literature also raises concern that some Echinacea preparations can alter drug-metabolising enzymes (reported effects on CYP1A2 and CYP3A4 probes).
Physiological Role
Not an essential nutrient; used pharmacologically as a botanical to influence host defence responses.
Primary Pathways
Performance / Health Relevance
Not a performance ingredient. Any relevance is limited to potential effects on susceptibility to or duration of upper respiratory tract infections in non-athletic and athletic populations exposed to common cold stressors.
Evidence Review
Practical Use & Dosage
- Minimum Effective Dose
- Not established (varies by preparation and trial)
- Optimal Range
- Not established
- Upper / Caution Level
- Not established
- Timing
- Varies by trial and preparation (prevention regimens and acute treatment regimens reported)
- Best Format
- Not established; trials used multiple species, parts and extraction methods
- Bioavailability
- Different species, plant parts and extraction processes produce markedly different preparations; results are not generalisable across formulations.
- Absorption Considerations
- Not established in the provided abstracts.
Safety & Interactions
Side Effects
- •Allergic reactions (possible, especially in people with Asteraceae/pollen allergy)
- •Gastrointestinal upset reported in some trials (varies by preparation)
Contraindications
- Known allergy to plants in the Asteraceae family
Drug Interactions
- •Potential to alter clearance of CYP1A2 and CYP3A4 substrates (e.g. caffeine, midazolam) reported in interaction reviews
Who Should Avoid
- •People taking critical CYP1A2 or CYP3A4 substrate drugs without medical advice
- •Those with known plant/pollen allergies
Monitoring
Be cautious with concomitant drugs metabolised by CYP1A2 or CYP3A4; consider medical review if using with narrow therapeutic index drugs.
Frequently Asked Questions
Auto-generated from indexed evidence — dosage, safety, interactions, and more.
When is Echinacea typically used or indicated?
Echinacea is most commonly used for: Prevention of common cold, Treatment of common cold symptoms, General immune support. Not an essential nutrient; used pharmacologically as a botanical to influence host defence responses.
How does Echinacea work?
Proposed actions include modulation of immune responses; clinical literature also raises concern that some Echinacea preparations can alter drug-metabolising enzymes (reported effects on CYP1A2 and CYP3A4 probes).
What is the recommended dose of Echinacea?
The optimal range is Not established. with a minimum effective dose of Not established (varies by preparation and trial). Best taken: Varies by trial and preparation (prevention regimens and acute treatment regimens reported). Upper / caution level: Not established.
What are the side effects of Echinacea?
Reported side effects include: Allergic reactions (possible, especially in people with Asteraceae/pollen allergy); and Gastrointestinal upset reported in some trials (varies by preparation). Monitoring: Be cautious with concomitant drugs metabolised by CYP1A2 or CYP3A4; consider medical review if using with narrow therapeutic index drugs.
Does Echinacea interact with medications?
Known or theoretical interactions: Potential to alter clearance of CYP1A2 and CYP3A4 substrates (e.g. caffeine, midazolam) reported in interaction reviews. Always check with a clinician before combining with prescription medication.
Who should avoid Echinacea?
Echinacea is generally not recommended for: People taking critical CYP1A2 or CYP3A4 substrate drugs without medical advice; Those with known plant/pollen allergies; and Known allergy to plants in the Asteraceae family.
How strong is the evidence for Echinacea?
Evidence level: Limited (overall score 46/100), based on 5 indexed studies on SuppIndex.
Research & References (5)
Common cold.
Clinical Evidence systematic review addressing treatments for common cold, including echinacea, searched major databases to January 2010 and summarised evidence and harms alerts.
Common cold.
Clinical Evidence systematic review up to May 2007 examining effects of treatments for common cold, included echinacea among interventions.
Interactions between herbal medicines and prescribed drugs: an updated systematic review.
Systematic review of interactions between seven popular herbal medicines and conventional drugs; echinacea may affect clearance of caffeine (CYP1A2 probe) and midazolam (CYP3A4 probe).
Select Dietary Supplement Ingredients for Preserving and Protecting the Immune System in Healthy Individuals: A Systematic Review.
Systematic review evaluating select dietary supplement ingredients for preserving immune function in healthy individuals; echinacea included among single-ingredient products and some trials point to possible benefit but overall gaps prevent firm conclusions.
Echinacea for preventing and treating the common cold.
Cochrane-style meta-analysis of 24 double-blind trials (4631 participants) comparing mono-preparations of echinacea with placebo for preventing and treating the common cold; noted substantial heterogeneity in species, plant parts and extraction methods.
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Research Overview
Limited EvidenceCite this ingredient
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Stable URL
https://thesuppindex.com/ingredients/echinacea
SuppIndex. (2026). Echinacea: Evidence summary, dosage and clinical studies. Retrieved October 16, 2026, from https://thesuppindex.com/ingredients/echinacea
Based on 5 indexed studies · Evidence level: Limited.
Goal Ratings
Stack Compatibility
Commonly combined with other immune-supporting ingredients in products; evidence pertains to single-ingredient preparations and is not generalisable to combinations.