Posted on May 20, 2008 by Dr. William RassmanDoes Propecia Block 100% of DHT? – Hair Loss Information by Dr. William Rassman My question is if Propecia blocks DHT, does it block 100% of DHT? Thanks. No. Propecia (finasteride 1mg) blocks around 60-70% of DHT at the hair level. The varying numbers depend on the source. Paid advertisements (not an endorsement):
why not block 100% Is it that we don’t have the technology yet or what?