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MedicineNet.com - Are there any interactions with medications?
Black Walnut  Are there any interactions with medications?
Medications taken by mouth (Oral drugs) Interaction Rating:
Moderate Be cautious with this combination. Talk with your
health provider.  Black walnut hulls contain a large amount of
chemicals called tannins. Tannins absorb substances in the
stomach and intestines. Taking black walnut along with
medications taken by mouth can decrease how much medicine your
body absorbs, and decrease the effectiveness of your medicine.
To prevent this interaction, take black walnut at least one hour
after medications you take by mouth.  Dosing considerations for
Black Walnut.  The appropriate dose of black walnut depends on
several factors such as the user's age, health, and several
other conditions. At this time there is not enough scientific
information to determine an appropriate range of doses for black
walnut. Keep in mind that natural