How Finasteride Prevents DHT and Hair Loss Hair loss in non natty bodybuilders is often driven by dihydrotestosterone (DHT), a hormone made when the enzyme 5-alpha-reductase converts testosterone into DHT. In people who are genetically sensitive, DHT binds to hair follicles, causing them to shrink and produce thinner, weaker hair over time. Eventually, the follicles stop producing visible hair. Finasteride works Blocking 5-alpha-reductase (Type II enzyme) this stops much of the conversion of tes

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