Symptoms of benign prostatic hypertrophy

For which of the following herbal remedies is there the best evidence for efficacy in treating the symptoms of benign prostatic hypertrophy?

(A) Saint-John’s wort
(B) Ginkgo
(C) Kava
(D) Saw palmetto
(E) No herbal therapy is effective

Saw palmetto is a popular herbal preparation used in the Tx. of BPH. Kava is used for anxiety and insomnia. Garlic is used for hypercholesterolemia. St. John’s wort is frequently used in the Tx. of depression. Glucosamine is used for osteoarthritis