What is the recommended dosage for Echinacea?

General: 300-500 mg standardized extract 3x/day; Acute Use: At first sign of symptoms for 7-10 days

What are the side effects of Echinacea?

Potential side effects include: Gastrointestinal upset (nausea, stomach pain), Allergic reactions (especially in those allergic to daisies, ragweed), Headache, Dizziness.

What is echinacea and how does it support the immune system?

Echinacea is a genus of flowering plants widely studied for immune support. The species E. purpurea and E. angustifolia contain alkamides and polysaccharides that may stimulate phagocytic activity and support the body's natural defense mechanisms.

What dosage of echinacea has been used in clinical trials?

Clinical studies have used a wide range of echinacea preparations. Common doses include 300–500 mg of standardized extract three times daily, or 2.5 mL of liquid extract. The species, plant part, and extraction method significantly affect outcomes.

What are the potential side effects of echinacea?

Side effects are generally mild and may include gastrointestinal upset, rash, or allergic reactions, particularly in individuals allergic to plants in the Asteraceae family. Long-term use beyond 8 weeks is not well studied.

Echinacea
Echinacea

herb

別名: Echinacea purpurea, Purple Coneflower, Echinacea angustifolia

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About

Echinacea is one of the most studied herbal immune supplements. Its alkylamide and polysaccharide constituents activate macrophages, enhance phagocytosis, and stimulate natural killer cell activity. Cochrane-reviewed meta-analyses suggest modest reduction in cold duration and severity when started at symptom onset.

How It Works

Activates macrophages, enhances phagocytosis, and stimulates NK cell activity through alkylamide and polysaccharide constituents; modulates cytokine production (TNF-alpha, IL-1, IL-6).

Evidence For Conditions

症状・状態	グレード	研究数	参加者数
Upper Respiratory Tract Infections	B	20	4000	詳細を見る →

Side Effects

Gastrointestinal upset (nausea, stomach pain)
Allergic reactions (especially in those allergic to daisies, ragweed)
Headache
Dizziness

Drug & Supplement Interactions

Immunosuppressant medications (may counteract immunosuppression)
CYP3A4 substrates (may alter metabolism of various drugs)
Caffeine (may slow caffeine metabolism)
Anabolic steroids and methotrexate (increased hepatotoxicity risk)

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Related Ingredients

Andrographis Astragalus Garlic Olive Leaf Extract Pelargonium sidoides

基本情報

用量: General: 300-500 mg standardized extract 3x/day; Acute_Use: At first sign of symptoms for 7-10 days
剤形: capsule tincture liquid extract tea lozenge
天然の供給源: Native North American plant (supplement form only)
上限量: No established UL; generally used for 10 days or less
推奨摂取タイミング: At first sign of symptoms; multiple doses throughout the day

エビデンスの要約

Upper Respiratory Tract Infections B

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