Study shows 60mg of sulforaphane slows doubling time of PSA in cancer patients by 86%.
“The sulforaphane used in this study appears to have been 6 pills per day of a French supplement called Prostaphane. This supplement, one of the few that is actually sulforaphane instead of its precursor glucoraphanin (sulforaphane glucosinolate), isn't available in the United States...”