Supplements for enlarged prostate.

My father who is 55 years old has been complaining of enlarged prostate, although he says he got it checked out last year, he suspects that is the problem. He says he goes often but has low flow with little to no pain. I am looking for some supplement that could aid him with his symptoms. I have read some research and see signs pointing to Iodine but I am not sure he will want to take that just yet. I read that Quercertin helps some, any other suggestion? Thanks.