Practitioners use 1.5 to 4.5 g of echinacea root a day. The published root trials tested 200 to 900 mg.
From the full film, The Echinacea Audit: From HPLC Markers to Clinical Reality: https://www.australian-pharmacognosy.org/videos/the-echinacea-audit-from-hplc-markers-to-clinical-reality/
Echinacea angustifolia monograph: https://www.australian-pharmacognosy.org/pharmacopoeia/echinacea-angustifolia/
If you want to use a herb, consult a degree-qualified herbalist with competencies and adequate training in pharmacognosy.
Prepared by the Department of Community Outreach, Australian Institute of Pharmacognosy, Cardwell, Queensland. Moment selection and copy: Jesse Kirby. Titling and channel fit: Zoe Bennett. Vertical layout and captions: Theo Karras.