Hi
I too have an enlarged prostate and took Saw Palmetto supplement for a number of years. Bluntly, it had no noticeable beneficial effect and was just a waste of money. It was only when I went to my doctor and was prescribed Tamsolusin ((Flomax) and Finasteride that there was any improvement to the symptoms.
I would stick with medically sound treatments rather than chase unproven supplements.
There are side effects, particularly with Finasteride and if these are troublesome you can talk to your Doctor about alternative medication.