Finasteride is a 5-alpha reductase inhibitor primarily used to treat male pattern baldness (androgenetic alopecia) in men. It works by reducing the levels of dihydrotestosterone (DHT), a hormone responsible for hair loss, thereby promoting hair regrowth and slowing further hair thinning. This supplement is typically taken once daily, with or without food, and may take several months of continuous use to show visible results. Finasteride is not intended for use in women or children and should be handled with caution, especially by pregnant women, as it can be absorbed through the skin and may cause birth defects. Common side effects may include decreased libido, erectile dysfunction, and mild scalp irritation. It is important to consult a healthcare professional before starting this supplement, especially for individuals with liver disease or a history of prostate conditions.