Veterinary Herbal Medicine: A Systems-Based Approach
2009-5-15u2002·u2002Herbs taken orally must pass through the GI tract, be acted upon by digestive enzymes and gut bacteria, pass through portal circulation and get to the liver for whatever processes occur there. As an example, isolated gingkolic acids from gingko and hyperforin from Saint John's Wort inhibit CYP2C19 activity in vitro ( Zou, 2002 ).
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