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Kelber, O. and Wittwer, A. and Lapke, C. and Kroll, U. and Weiser, D. and Okpanyi, S. N. and Heilmann, Jörg (2006) Ex vivo/in vitro absorption of STW 5 (Iberogast) and its extract components. Phytomedicine 13 (Suppl. 5), pp. 107-113.
Jager, H. and Meinel, L. and Dietz, B. and Lapke, C. and Bauer, R. and Merkle, H. P. and Heilmann, Jörg (2002) Transport of alkamides from Echinacea species through Caco-2 monolayers. Planta medica 68 (5), pp. 469-471.