@beaquilter Sulforaphane is the ingredient in broccoli sprouts. I posted a report authored by Mayo's physicians on this topic, but it was taken down after several days. Why..go figure since it was a Mayo-generated research on the positive research metrics. For those who read this, do your homework on this interesting topic. But, sulforaphane seems to slow cancer cell growth and as such impact the PSA in a positive manner. Do I take this supplement? Yes, I buy from Amazon. Why? 2010 underwent proton radiation therapy (PSA: 6.47 Diagnosis as slow-growing prostate cancer; 2.5 months at Loma Linda Hospital with 50 morning treatment at $3300. per treatment. Flash forward 10 years and PSA began to climb; I started taking this supplement after MRI and PET scan showed no cancer, yet PSA kept increasing. Since taking this supplement, the increase in PSA has STOPPED. Take this example for what it is..for the right individual, this natural supplement may slow cancer growth meaning longer life without the downsides of ADT or some other drug. Do your research on this topic and make your own judgment on this entry. The total cost was paid through TriCare of Life..as retired military. Cheers and Happy Holidays. RH-Florida