Would propecia affect my performance in the gym, and my muscle gains. I know propecia kills the DHT which is a byproduct of testosterone, but does DHT play a role in bodybuilding?

Propecia blocks conversion of testosterone to its byproduct DHT, the hormone responsible for hair loss in male pattern baldness. DHT also increases the size of the prostate gland and increases the risk of prostate cancer. Although testosterone is mostly responsible for muscle growth, animal studies have shown that injection of DHT can also stimulate muscle growth in animals after castration (see Selective androgen receptor modulator treatment improves muscle strength and body composition and prevents bone loss in orchidectomized rats).The portion of DHT in muscle expansion and whether or not blocking production of DHT alone can affect muscle building are not clear yet.

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