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Herb

Echinacea Purpurea

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Echinacea Purpurea. Coneflower for upper respiratory infections.

How it works. Alkylamides activate CB2 receptors; immunomodulatory.

What the research supports. 1 graded claims. Strongest: Reduces URTI severity (moderate).

How much to take. Typical dose: 300 mg TID.

Side effects and interactions. 1 medication interaction listed. No serious side effects listed at normal doses.

Stacking. Pairs well with Vitamin D3 + K2, Zinc.

Common forms. Available as Standardized extract capsule, Liquid tincture (alcohol or glycerin), Powdered whole herb, Traditional decoction or tea.

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

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

Echinacea Purpurea. Coneflower for upper respiratory infections.

Key compound: cichoric acidC22H18O12 · 474.4 g/mol

What it is

Coneflower for upper respiratory infections.

Food sources

Whole dried plant material (root, leaf, flower, or aerial parts depending on the species)Standardized hydroethanolic or aqueous extract (capsule, tincture, or tea)Powdered traditional preparation used in Ayurvedic, TCM, or Western herbal practice

Goals

Immune Function

How it works

Alkylamides activate CB2 receptors; immunomodulatory.

Pathways

  • Alkylamides activate CB2 receptors
  • immunomodulatory

Effects

  • ↓URTI severity decreases

What the research supports

Reduces URTI severitymoderate

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 mg TID
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 extract capsule form.
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Side effects & interactions

Common side effects

  • GI upset
  • Rash

Medication interactions

Prescription medications (general)minor

Always disclose Echinacea Purpurea use to your prescriber — additive, antagonistic, or pharmacokinetic interactions are possible.

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.

Common forms

  • Standardized extract capsule
  • Liquid tincture (alcohol or glycerin)
  • Powdered whole herb
  • Traditional decoction or tea

Key studies

8 studies cited in total.

Echinacea meta-analysis ↗
Meta-analysis · Lancet Infect Dis · 2007

Reduced URTI incidence 58%.

PubMed: Echinacea Purpurea — Reduces URTI severity ↗
Systematic review · PubMed (NLM) · 2026

Opens current human and preclinical literature matching Echinacea Purpurea and "Reduces URTI severity". Filter by RCT, meta-analysis, or year on the results page.

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

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

Discussion

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