A nurse is caring for a patient who has been diagnosed with type 2 diabetes. The patient has reported that he or she frequently uses herbal remedies. Before administering any antidiabetic medications, the nurse should caution the patient about the use of which of the following herbal therapies? 

a. Glucosamine.

b. Ginseng.

c. St. John’s wort. 

d. Juniper berries.

e. Garlic. 

f. Kava.