Determination of Topically Applied Finasteride Penetrated Into Hair Follicles Using the Differential Stripping Technique

Topical finasteride (P-3074) can inhibit scalp DHT by up to 70%, with some users experiencing systemic absorption similar to oral use. Users discuss varying application frequencies and concentrations, with some noticing side effects when overused.

The conversation discusses using homemade topical finasteride for hair loss, showing an increase in DHT levels despite treatment. The user applies 0.125mg daily, resulting in 113.4% of previous DHT levels.

The conversation discusses how the absorption rate of topical finasteride varies and is not equivalent to its oral form, with only a small percentage reaching the scalp. It also mentions that minoxidil in high concentrations is used topically because only a small amount is absorbed.

The user convinced their trichologist to prescribe topical finasteride after using topical estradiol and progesterone for hair maintenance. They also discussed the potential impact of "nofap" on hair loss, noting that abstaining for about four months seemed to reduce shedding.

Topical finasteride can be as effective as oral finasteride for hair regrowth with fewer systemic side effects, but precise dosing is essential. Combining oral dutasteride with topical finasteride is not recommended due to dutasteride's stronger inhibition.

Topical finasteride concentrations are likely much higher than necessary for effective follicular DHT suppression, with current standards being 100-1000 times above the theoretical minimum. Lower concentrations (0.001-0.0025%) might still work locally while minimizing systemic exposure.