A. Swain

Supplementation With Goldenseal (Hydrastis canadensis), but not Kava Kava (Piper methysticum), Inhibits Human CYP3A Activity In Vivo

D. K. Williams, W. Gentry, B. Gurley, 2008, Clinical pharmacology and therapeutics.

Effect of Goldenseal (Hydrastis canadensis) and Kava Kava (Piper methysticum) Supplementation on Digoxin Pharmacokinetics in Humans

D. K. Williams, B. Gurley, C. R. Yates, 2007, Drug Metabolism and Disposition.

Gauging the clinical significance of P-glycoprotein-mediated herb-drug interactions: comparative effects of St. John's wort, Echinacea, clarithromycin, and rifampin on digoxin pharmacokinetics.

D. K. Williams, B. Gurley, S. K. Battu, 2008, Molecular nutrition & food research.

Clinical assessment of CYP2D6-mediated herb-drug interactions in humans: effects of milk thistle, black cohosh, goldenseal, kava kava, St. John's wort, and Echinacea.

D. Carrier, D. K. Williams, B. Gurley, 2008, Molecular nutrition & food research.