Not sure if this has been discussed already, but I came across this article comparing Black Tea to Finasteride as having the same effect in reducing DHT.
http://www.hairloss-research.org/UpdateBlacktea7-09.html
clipped from article…
It would appear reasonable based upon these findings that exclusive consumption of Black Tea or Black Tea Extract (Theaflavins) would likely reduce serum DHT to the same level as Propecia, and that the concurrent consumption of Soy Isoflavones or Soy Isoflavones with Green Tea would produce an additive effect. The effects of Black Tea Theaflavins /Soy Isoflaones, or Black Tea Theaflavins/Soy Isoflavones/Green Tea, on testosterone levels remain unclear.