Saw palmetto works to some extent, but if you want something that really works try Avodart(dutasteride). It will really shrink your prostate, even when on testosterone. However that is up to 250mg. a week. Over that and it is less effective without increasing the standard dose of .5 mg. a day. It is expensive, but I have found that the Generic version made by Cipla(India) seems to be just as effective as the major brand at less than half the price.