After four to five weeks of using Revivogen, I saw a significant decrease in hair thinning or shedding and notice a difference in how your hair looks and feels. Revivogen can only help with androgenic alopecia to stop the hair loss and regrow the hairs lost during the past three years. Revivogen reduces DHT production, prevents DHT from entering the hair follicles, and stimulates the follicles to enter into a new growth cycle.