The extent of induction of CYP3A by St. Johnʼs wort varies among products and is linked to hyperforin dose - Mueller, S C; Majcher-Peszynska, J; Uehleke, B; Klammt, S; Mundkowski, R G; Miekisch, W; Sievers, H; Bauer, S; Frank, B; Kundt, G; Drewelow, B (Eur J Clin Pharmacol, 2006)