Treatment with a 5-alpha reductase inhibitor did not adversely affect fat-free mass in healthy men given varying doses of testosterone, a randomized trial showed.

Mean fat-free mass increased by 0.6 to 7.1 kg over 20 weeks in men taking dutasteride (Avodart) and different doses of testosterone enanthate. Men treated with placebo and testosterone gained an average of 0.8 to 8.1 kg in fat-free mass.

Muscle strength, sexual function, and prostate volume also did not differ significantly between treatment groups, as reported in the March 7 issue of the Journal of the America Medical Association.

"The finding that 5α-reduction of testosterone to DHT [dihydrotestosterone] is not obligatory for mediating its effects on outcomes that were studied in this trial has implications for therapeutic applications of androgens and 5α-reductase inhibitors," Shalender Bhasin, MD, of Boston University, and co-authors wrote. "These findings bode well for the safety of 5α-reductase inhibitors with respect to their effects on muscle."

Hope this helps a little.....

i was taking it before for about a month before i heard of sexual sides, screw that, dropped it real quick.