I found it interesting that of all the studies showing that DHT inhibitors negatively effect male fertility there was one that stated that finasteride has no effect on male fertility whatsoever. That is of course until you see who is involved in the research.
Chronic treatment with finasteride daily does not affect spermatogenesis or semen production in young men.
Overstreet JW, Fuh VL, Gould J, Howards SS, Lieber MM, Hellstrom W, Shapiro S, Carroll P, Corfman RS, Petrou S, Lewis R, Toth P, Shown T, Roy J, Jarow JP, Bonilla J, Jacobsen CA, Wang DZ, Kaufman KD.
CONCLUSIONS: Treatment with 1 mg. finasteride daily for 48 weeks did not affect spermatogenesis or semen production in young men. The effects of 1 mg. finasteride daily on prostate volume and serum PSA in young men without benign prostatic hyperplasia were small and reversible on discontinuation of the drug.
ncbi.nlm.nih.gov/pubmed/10492183
Yes, the same Keith Kaufman of Merck Research Laboratories who’s job it was to make sure that Propecia was approved by the FDA.