Broccoli has been described as one of natures most perfect foods. It also contains the anti-cancer compound Sulforaphane, which is in numerous clinical trials including a phase II trial for prostate cancer., which is under study in a variety of clinical trials. Wikipedia reports, "Sulforaphane is in numerous clinical trials including a phase II trial for prostate cancer.. To see those reports, see the the notes under "Sulforaphane."
I liked the broccoli green smoothie, but you have to be in the right mindset for it. It has an earthy flavor. I was able to drink 4 cups of it without getting tired of it, which has not been true of a few of my experiments.