I do wonder if there's a way to know beforehand if you're more likely to respond badly to dutasteride. Anything in your bloodwork that could indicate it - having high T for example. The 20% boost, or whatever it is, from dutasteride, could be why some people claim dutasteride didn't work on their hairline. Because all that Testosterone could be damaging too, regardless of the DHT inhibition. Purely broscience but there are so many people claiming dutasteride ate their hairline that I do believe there's some truth in the loose theory that some people's frontal hair is more sensitive to androgens in general, not just DHT.