Analysis of the Inhibitory Potential of Ginkgo biloba, Echinacea purpurea, and Serenoa repens on the Metabolic Activity of Cytochrome P450 3A4, 2D6, and 2C9), as well as other herbals and spices such as sage, thyme and cloves, the soybean components daidzein and genistein (Foster et al., Phytomedicine (2003):