Clinical ginkgo extracts are refined 50:1 and keep ginkgolic acids below 5 ppm. Crude leaf products skip that step.
From the full film, The Ginkgo Paradox: The Clinical Reality of a Famous Herb: https://www.australian-pharmacognosy.org/videos/the-ginkgo-paradox-the-clinical-reality-of-a-famous-herb/
Ginkgo leaf (Ginkgo biloba) monograph: https://www.australian-pharmacognosy.org/pharmacopoeia/ginkgo-biloba/
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.