Clinical and Hormonal Effects of the 5 Alpha-Reductase Inhibitor Finasteride in Idiopathic Hirsutism

Finasteride not only inactivates the 5a reductase enzyme but also affects the 5b reductase enzyme in a dose-dependent manner, which can impact sexual behavior and brain activity. The user experienced significant hair regrowth and side effects on 1mg of finasteride, which diminished after reducing the dose to 0.5mg, leading to no side effects and further hair improvement.

Finasteride's effectiveness and side effects may vary based on male phenotypes, with some users noting differences in response related to body and facial hair characteristics. Some users report success with lower doses, while others experience side effects, suggesting individual variability in response to the treatment.

A 21-year-old experienced hormone changes after using self-made topical finasteride for hair loss, including a 20% decrease in DHT, a 47% increase in testosterone, and a 39% increase in estradiol. The user previously used minoxidil and microneedling but is now seeking ways to balance hormones, possibly through supplements or dosage adjustments.

Hair loss treatments, specifically 5AR inhibitors, can impact neurosteroids and sexual health. The effects of topical fin/dut on tissue-specific DHT levels are unclear.

Finasteride can increase body and facial hair growth due to increased testosterone, despite its intended use to reduce hair loss on the scalp. Some users consider trying topical finasteride for less systemic impact, while others report mixed results and side effects.

Caffeine may promote hair growth and potentially inhibit 5-α-reductase activity in hair follicles, but its effectiveness and systemic impact remain unclear. Users discuss using topical caffeine solutions, with some experiencing no side effects compared to finasteride.