I think Dutasteride was unnecessary, My hair was growing back just fine on CPA + Estradiol, i added Dutasteride because i was impatient, and I got the Telogen Effluvium that usually comes with starting drugs like Finasteride or Dutasteride, Im still recovering from my Telogen Effluvium.
CPA blocks DHT pretty effectively:
"Cyproterone acetate works in several ways. It not only competitively blocks DHT from binding to its receptors at target tissue (
Gilman et al., 1990), but it is also a progestogen that lowers testosterone levels by decreasing the release of luteinizing and follicle-stimulating hormones through pituitary-mediated supression (
Gilman et al., 1990,
Varothai and Bergfeld, 2014)."
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5419033/
also with a Testosterone level of 25 ng/dl, there is hardly any DHT being converted at all, which means that 100% of DHT is blocked.