The thing is Avodart formulation sadly sucks so many ppl dont get enough dutasteride on their serum. That is why a blood test is still good. Some people need more dutasteride but not because it is not working on them but because the formulation of it is so bad and old that the bioavailability can go from 40% to 95% lol. Such a bad design if you ask me, you cant simply release a drug that in a person can work at a 40% of potency and for another person can work perfectly. I believe that is why some people get better response than other to 0.5 mg dutasteride and why most ppl get better results with 2.5 mg because even if you absorb 40% you are still taking a high amount