No current physician diagnosed disease (including but not limited to): kidney disease requiring dialysis, cognitive deficits, substance abuse

BMI \< 18.5 kg/m2 or \> 40 kg/m2

Use of any hormonal treatments, including but not limited to testosterone

Any previous cancer diagnosis or treatment within the previous five years, excluding non-melanoma skin cancer

Inability or unwillingness to eat a diet that is free of Brassica vegetables for the duration of the study

Use of any dietary supplements other than a multivitamin (including herbal preparations)

Allergy to cruciferous vegetables or any of the specific fillers used in the placebo

Usual consumption of \> 5 servings per week of Brassica vegetables

Effects of Sulforaphane on Normal Prostate Tissue