During a Routine Health Examination, the Patient Tells the Nurse

During a routine health examination, the patient tells the nurse that about using a variety of herbal therapies for health maintenance. In discussing the use of herbs, the nurse cautions the patient that

A) herbs should be purchased only from manufacturers with a history of quality control of their products.
B) herbs are no better than conventional drugs in maintaining health and may be less safe.
C) most herbs are toxic and carcinogenic and should be used only when proven effective.
D) frequent medical evaluation is required during the use of herbs to avoid adverse effects.