Q137) A 45-year-old man presents to your office for regular health check up. Lately, he has experienced reduced libido and erectile dysfunction . Further work-up reveals no organic cause for his impotence. You offer him sildenafil however, he requests you to provide information on any natural herbal medicine that could likely help his sexual problems. Which of the following is likely to improve his erectile dysfunction?
D) St.Johns Wort
E) Ginkgo biloba