Citation: Etheridge AS, Black SR, Patel PR, So J, Mathews JM. An in vitro evaluation of cytochrome P450 inhibition and P-glycoprotein interaction with goldenseal, Ginkgo
biloba, grape seed, milk thistle, and ginseng extracts and their constituents. Planta Med. 2007 Jul;73(8):731-41. Epub 2007 Jul 5. PubMed PMID: 17611934.Pubmed Abstract
Citation: Final Study Report. Goldensealrt: Interaction of Extracts with Cytochrome P450 Enzymes and P-glycoprotein. Studies of Chemical Disposition in Mammals. 10/14/2002 - 02/28/2006.