5α-Reductase inhibitors like finasteride and dutasteride can slightly increase circulating levels of testosterone by inhibiting its metabolism .  However, these drugs do this via prevention of the conversion of testosterone into its more potent metabolite dihydrotestosterone (DHT), and this results in dramatically reduced circulating levels of DHT (which circulates at much lower relative concentrations).   In addition, local levels of DHT in so-called androgenic (5α-reductase-expressing) tissues are also markedly reduced,   and this can have a strong impact on certain effects of testosterone.   For instance, growth of body and facial hair and penile growth induced by testosterone may be inhibited by 5α-reductase inhibitors, and this could be considered undesirable in the context of, for instance, puberty induction .   On the other hand, 5α-reductase inhibitors may prevent or reduce adverse androgenic side effects of testosterone like scalp hair loss , oily skin , acne , and seborrhea .  In addition to the prevention of testosterone conversion into DHT, 5α-reductase inhibitors also prevent the formation of neurosteroids like 3α-androstanediol from testosterone, and this may have neuropsychiatric consequences in some men. 
From a cattleman's perspective, I would like to add to your timely article that besides the benefits that would come to the environment from stopping the use of pharmaceutical growth promoters in cattle, we would also have a more tender product to market. An under-reported side effect of the use of growth stimulants is about a 25 percent increase in toughness of the meat. If the beef industry would eliminate growth-enhancing drugs, our market would expand. Many producers have calculated, as I have, that this increased demand for beef would more than make up economically for less weight gain by untreated cattle.
This is currently being reevaluated because many users report almost the same gains taking the compound orally as they do with DMSO. Fat loss seems to extremely pronounced when doing oral administration. Many users shy away from using DMSO because of the garlic-type smell they encounter on their bodies and on their breath a short time after using the product. There is a new item out called Phlojel, which acts much like DMSO minus the stink. This should eventually increase in popularity, and my guess is that DMSO will take a back seat to Phlojel.