Does Dong Quai affect Birth Control Pill?

Patient : I am interested in taking a multivitamin targeted for people who are quite active. It's called Opti-Women. One of the ingredients is Dong Quai (80mg 4:1 root extract). I have heard that Dong Quai can affect the effectiveness of a birth control pill. Is this true? Would you advise against taking the supplement or is it too minute an amount to do much (safe to take)?
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