beeboys // Shutterstock Shampoos for treating hair loss: Pros, cons, and do they work? Dihydrotestosterone, or DHT, is an androgen hormone produced by testosterone. High levels of DHT can cause hair loss problems, including androgenetic alopecia, or AGA, and male pattern baldness, SaveHealth reports.  Prescription DHT shampoos like ketoconazole reduce DHT production by ...