A 1999 study on male participants aged 18 to 36 with moderate crown hair loss received Finasteride 5mg, 1mg, 0.2mg, 0.01mg, or a placebo once a day [5]. Researchers found that Finasteride doses 0.2mg and above could effectively improve scalp hair count, with Finasteride 1mg being the optimal dose for treating hair loss. Another 1999 study found that 1mg and 5mg Finasteride reduced scalp DHT levels by 64.1% and 69.4% respectively [6]. A reduction in scalp and serum DHT levels is linked with decreased hair loss.