I had to use this for eight months before I saw any improvement. I actually have really dry hair.. and my dandruff are actually really dry, crisp white flakes. Went to the doctor and he said I have dry scalp and gave me medicated shampoo but it didn't work for many years. When I first received this shampoo it said "for oily hair" so I was a bit skeptical but I tried it anyway. I also use a lot of conditioner and alternate different shampoos on different days. This shampoo works, but it takes time. For me it took a year. The "dandruff" is gone but I still have dry hair...