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I know the study you are referring to, but I think the systemic effects highly depend on the vehicle used. There is another study showing that 0.25% topical finasteride does not affect serum dht.Finasteride 0.01% (microdosed to prevent systemic absorption, as we've documented 71% suppressed serum DHT using a stronger 0.25% topical, equivalent to the suppression seen with 1mg oral finasteride).
A randomized, double-blind controlled study of the efficacy and safety of topical solution of 0.25% finasteride admixed with 3% minoxidil versus 3% minoxidil solution in the treatment of male androgenetic alopecia. doi:10.1111/jdv.15171
I am currently looking for a reasonable topical finasteride solution that would not significantly suppress my DHT levels and still provides decent hair protection.