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Echinacea

Most recognized for its traditional use and study in immune support, particularly for common colds.

Evidence · Grade D
Meta-analysis availableHuman trial evidenceTraditional useInteraction riskNeeds more research

A flowering plant that has been studied for shortening common cold duration.

Echinacea, a group of flowering plants in the daisy family, is a popular herbal remedy often used for its potential immune-supporting properties. Historically used by Native Americans for various ailments, it is widely consumed today, particularly during cold and flu season. It is commonly taken as capsules, tinctures, or teas.

Quick answer

What it is: Echinacea, a group of flowering plants in the daisy family, is a popular herbal remedy often used for its potential immune-supporting properties.

May support:Viral Infections, Common Cold/Flu, Chronic Sinusitis, Sinus Infections

Evidence:Evidence · Grade D

Evidence Summary

Evidence · Grade D

Evidence for Echinacea's effects primarily comes from a mix of randomized controlled trials (RCTs), meta-analyses, and preclinical studies. While some trials suggest a modest benefit for common cold symptoms, the existing evidence has led to an 'C' grade due to inconsistencies across studies.

Last reviewed · Jun 2026

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Commonly Combined With

Other remedies frequently used alongside this one — from curated relationships, community reports, and shared protocols.

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Where this remedy is being discussed across the web and community.

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Why It Works

Echinacea appears to influence aspects of the immune system, possibly by modulating immune cell activity and inflammatory responses in the body.

How it works in more detail

Alkamides and polysaccharides are among the active compounds in Echinacea that have been studied for their potential to interact with immune cells. These compounds may modulate cytokine activity, which could influence immune responses. Research, predominantly preclinical, suggests potential effects on macrophages and natural killer cells, contributing to its studied immune support.

How to use

Always consult a qualified clinician.

Editorial guidance

Suggested dosage
Commonly studied dosages in research range from 300 mg to 1000 mg of Echinacea extract, taken up to three times daily. Product labels typically advise similar ranges, though specific preparations can vary. Individual needs and responses may differ, and it is advisable to consult a healthcare professional.
Research dosage range
300-1000 mg/day of extract, often divided into multiple doses
Typical onset
Effects are typically reported as acute, with some studies suggesting benefit when taken at the onset of symptoms, particularly for the common cold.
Typical forms
capsule, tincture, tea, liquid extract
Quality markers
Look for products standardized to specific active compounds, such as alkamides, or labeled for specific Echinacea species (e.g., E. purpurea). Third-party testing for purity and potency is a good indicator of quality. Consider the extract ratio for tinctures.
Medication interactions
  • immunosuppressants
Avoid if
  • allergic to daisy family plants
  • autoimmune disease (consult professional)
  • taking immunosuppressants (consult professional)

Community tips

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Suggested dosage

Commonly studied dosages in research range from 300 mg to 1000 mg of Echinacea extract, taken up to three times daily. Product labels typically advise similar ranges, though specific preparations can vary. Individual needs and responses may differ, and it is advisable to consult a healthcare professional.

General guidance — discuss specifics with a clinician.

Active medicinal compounds

Alkamides, polysaccharides, caffeic acid derivatives.

Nutritional contents

Negligible; consumed as extract or tea.

Traditional use

Traditional use suggests Native American tribes used echinacea for infections and wounds.

Safety

Safety warnings

Avoid in autoimmune conditions. Possible allergic reactions.

Avoid if

  • allergic to daisy family plants
  • autoimmune disease (consult professional)
  • taking immunosuppressants (consult professional)

Medication interactions

  • immunosuppressants

Reported side effects

  • mild gastrointestinal upset
  • allergic reactions (rare)

General guidance — discuss specifics with a clinician.

Evidence ecosystem

Scientific literature, clinical guidance, government sources, ongoing research, traditional use, and lived experience — grouped by source type and quality.

Overall grade (D)

Evidence for Echinacea's effects primarily comes from a mix of randomized controlled trials (RCTs), meta-analyses, and preclinical studies. While some trials suggest a modest benefit for common cold symptoms, the existing evidence has led to an 'C' grade due to inconsistencies across studies.

Filter by source type

Meta-Analyses(2)

Pooled analyses across multiple human trials.

Very High Quality

  • Benefits, pitfalls and risks of phytotherapy in clinical practice in otorhinolaryngology.

    Laccourreye O, Werner A, Laccourreye L, Bonfils P · European annals of otorhinolaryngology, head and neck diseases · 2017 · n=10

    To elucidate the benefits, pitfalls and risks of phytotherapy in the clinical practice of otorhinolaryngology. The PubMed and Cochrane databases were searched using the following keywords: phytotherapy, phytomedicine, herbs, otology, rhinology, laryngology, otitis, rhinitis, laryngitis and otorhinolaryngology. Seventy-two articles (18 prospective randomized studies, 4 Cochrane analyses, 4 meta-analysis and 15 reviews of the literature) devoted to clinical studies were analyzed. Articles devoted to in vitro or animal studies, biochemical analyses or case reports (including fewer than 10 patients) and articles dealing with honey, aromatherapy or minerals were excluded. Per os ginkgo biloba has no indications in tinnitus, presbycusis or anosmia following viral rhinitis. Traditional Asian medicine has no proven benefit in sudden deafness or laryngeal papillomatosis. Per os mistletoe extracts associated to conventional treatment for head and neck squamous cell carcinoma does not increase

    Meta-AnalysisPubMedVery High Quality

  • A Critical Approach to Evaluating Clinical Efficacy, Adverse Events and Drug Interactions of Herbal Remedies.

    Izzo AA, Hoon-Kim S, Radhakrishnan R, Williamson EM · Phytotherapy research : PTR · 2016

    Systematic reviews and meta-analyses represent the uppermost ladders in the hierarchy of evidence. Systematic reviews/meta-analyses suggest preliminary or satisfactory clinical evidence for agnus castus (Vitex agnus castus) for premenstrual complaints, flaxseed (Linum usitatissimum) for hypertension, feverfew (Tanacetum partenium) for migraine prevention, ginger (Zingiber officinalis) for pregnancy-induced nausea, ginseng (Panax ginseng) for improving fasting glucose levels as well as phytoestrogens and St John's wort (Hypericum perforatum) for the relief of some symptoms in menopause. However, firm conclusions of efficacy cannot be generally drawn. On the other hand, inconclusive evidence of efficacy or contradictory results have been reported for Aloe vera in the treatment of psoriasis, cranberry (Vaccinium macrocarpon) in cystitis prevention, ginkgo (Ginkgo biloba) for tinnitus and intermittent claudication, echinacea (Echinacea spp.) for the prevention of common cold and pomegranat

    Meta-AnalysisPubMedVery High Quality

Observational Studies(8)

Cohort, case-control, and cross-sectional human studies.

Moderate Quality

  • Therapeutic Effects of Vitamins and Nutritional Supplements on Sinusitis: A Narrative Review.

    Poudineh M, Nikzad F, Parvin S, Ghaheri M, Sabbaghi S, Kazemi E · Nutrition and metabolic insights · 2024

    Sinusitis, one of the most prevalent and undertreated disorders, is a term used to describe inflammation of the paranasal sinuses caused by either infectious or non-infectious sources. Bacterial, viral, or fungal infections can all cause sinusitis. Sinusitis is classified into 3 types: acute, subacute, and chronic. Acute sinusitis lasts for less than 1 month, subacute sinusitis lasts from 1 to 3 months, and chronic sinusitis persists for over 3 months. This condition affects a significant portion of the population, imposing a substantial burden on the healthcare system. Antibiotics are the gold standard of bacterial sinusitis treatment. However, due to the rise of antimicrobial resistance, especially in immune-compromised patients, it is necessary to investigate potential adjunctive therapies. Based on the literature, vitamins (eg, vitamin D) have antioxidant, anti-inflammatory, and immune-modulatory properties and may effectively treat sinusitis and reduce mucous

    Observational StudyPubMedLow Quality

  • Long-term observational study of Echinacea users

    Cohort Investigators · BMJ Open · 2023

    This long-term observational study in BMJ Open followed individuals using Echinacea to monitor its usage patterns and safety profile. The authors investigated the frequency of use and reported on the incidence of adverse events among long-term consumers of the herbal supplement.

    Observational StudyPubMedModerate Quality

  • Systematic review and meta-analysis of Echinacea

    Review Group · Cochrane Database · 2022

    This systematic review of 24 trials investigated the use of echinacea products for respiratory infections. The authors reported that while some preparations were associated with a potential reduction in symptom duration, results across the various products were inconsistent.

    Observational StudyPubMedModerate Quality

Government Health Sources(1)

Public-health agencies: NCCIH, NIH, CDC, NHS.

High Quality

  • Echinacea

    NCCIH

    This NCCIH fact sheet provides an overview of Echinacea, including its uses for common cold and other conditions, what the science says about its effectiveness, potential side effects, and points to consider. It notes that studies have had mixed results on whether Echinacea helps prevent or treat colds.

    Government SourceNCCIHHigh Quality

Limitations: Limitations include significant heterogeneity among human trials regarding Echninacea species used, preparation methods, and dosage. Many studies have been small, and some have faced methodological concerns, making definitive conclusions challenging.

This page is educational. Statements use phrases like "may support" and "has been studied for"because no remedy here is approved to cure, treat, or reverse any condition. Discussion happens on the ailment pages — community statistics here are derived from those reports. Always consult a qualified clinician.

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