Secondly, I wouldn’t be concerned whether or not you’re shedding. Some people shed a little bit, and some people don’t — but shedding is definitely NOT always a good sign (as you know). Some shedding is normal because of the nature of the massages. However, some people also shed because they create too much friction on the scalp skin, or they don’t allow for enough recovery time in between sessions. That’s not the good type of shed. So, don’t worry about not shedding 🙂 Regrowth is possible with or without the type of shedding you’re looking for.
Dutasteride, however, is a so-called dual inhibitor with both 5α-R1 and 5α-R2 inhibition. IC50 for 5α-R1 is 7 nM but 6 nM for 5α-R2. As mentioned above, it reduces DHT > 90% overall, or precisely % and for intraprostatic DHT the reduction is 97-99%. Dutasteride has also been found to inhibit 5α-R3, in vitro, with IC50= nM.  The 2,5-difluorophenyl side chain on the D-ring of the compound shows significant lipophilic features and as increased lipophilicity enhances the potency of the compounds binding at pocket site, its potency is much greater than of finasteride.