Echinacea
The cold-and-flu herb. Real but modest reductions in respiratory infection rate and duration when taken early — quality varies wildly between products.
Multiple meta-analyses support ~30% cold incidence reduction and ~1 day duration reduction. Effects: from first dose if started early.
Echinacea purpurea and angustifolia are American flowering plants used by Plains Indigenous peoples and adopted into Western herbalism for immune support. Multiple meta-analyses confirm modest but real reductions in cold incidence (~30%) and duration (~1 day) — especially when started at first symptoms. The catch: product quality varies enormously, and not all species / preparation methods are equivalent. Standardised E. purpurea aerial-part extracts (Echinaforce / Echinacin) have the most consistent evidence.
- Form
- Echinaforce (A. Vogel — most-studied), EchinaGuard, or other standardised E. purpurea preparations. Aerial parts > root for purpurea.
- Dose
- 500–1,000 mg standardised extract 3x daily at onset of cold symptoms or for prevention.
- Timing
- With or without food. Split across the day.
- Schedule
- Acute use: 7–10 days at first sign of cold. Prevention: 5 days on, 2 days off, in cold-and-flu season.
- Side effects
- Generally well-tolerated. Mild GI upset, skin rash. Allergic reactions in those allergic to Asteraceae family (ragweed, daisy).
- Interactions
- Immunosuppressants — opposing. Caffeine metabolism (mild slowing). CYP3A4 substrates — modest interactions.
- Contraindications
- Active autoimmune disease (relative). On immunosuppressants. Allergy to ragweed / Asteraceae family.
- Lab markers
- Not standard.
- Food sources
- Echinacea tea (mild), traditional tincture.
Pairs with
Vitamin C, zinc, elderberry, vitamin D (immune stack). Andrographis (additive cold reduction).
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