Saw Palmetto inhibits 5alpha reductase activity. This study looked at the inhibition of Saw Palmetto of 5alpha reductase activity in prostate cancer. Saw Palmetto is also known as Serenoa repens.
Saw Palmetto extract found to be potent inhibitor of 5alpha reductase activity. Inhibition was 61%. This study looked at the inhibition in those men with BPH.