Kava toxicity .pdf.
An interesting view on the possible why of liver toxicity in acetone extracts of kava, received with thanks from Peter A. Whitton:
Kava lactones and the kava-kava controversy.
Peter A. Whitton, Andrew Lau, Alicia Sainsbury, Julie Whitehouse, Christine S. Evans. Phytochemistry 64 (2003), pages 673-679.