In vivo assessment of botanical supplementation on human cytochrome P450 phenotypes: Citrus aurantium, Echinacea purpurea, milk thistle, and saw palmetto - Gurley, B J; Gardner, S F; Hubbard, M A; Williams, D K; Gentry, W B; Carrier, J C; Khan, I A; Edwards, D J; Shah, A K (Clin Pharmacol Ther, 2004)