Prostol? Dual Action Prostate Formula: Combines the synergistics benefits of Sabal(saw palmetto) and Urtica(nettle) in a preparation proven to inhibit 5-alpha-reductase and aromatase activity.* Scientific studies using Prostol have shown the following benefits: Increase urine flow* Decreases residual urine in the bladder* Reduces frequency of urination* Reduces post-urination dribbling* Prostol is the only prostate formula proven to be a "dual enzyme inhibitor", and to be more effective than Saw Palmetto alone.