Well, that web site is partly true and partly nonsense.  Basically,
estradiol will cause inappropriate cell division within the prostate, so
you want to keep that level low.  Also, DHT will prevent the normal
apoptosis that occurs for prostate cells, so you want to keep that level
very low.  Finally, testosterone is what produces the apoptotic proteins
that kills the prostate cells when they get old (or are cancerous).  So,
to eliminate BPH (and early stage prostate cancer), you want high
testosterone, very low DHT (you need a 5AR2 inhibitor to achieve this)
and low estradiol (you need arimidex to achieve this).  All of these are
only available by prescription and must be taken under a knowledgable
doctor's care.

If you want to read more about the science involved here, check out my
paper at:

http://www.tbiomed.com/content/2/1/10

My next paper should clarify this all greatly, and hopefully will be
published in that same journal before the end of this year.

Ed Friedman