I suffer from dandruff since many years, my scalp gets used to any products very fast and they stop working so I have to switch them every year/few months. I use this product since over a month, I used half of the bottle, this combined with the innisfree dandruff shampoo made my life easier. This Product started working after around a week, my scalp feels fresh and clean. The smell is also amazing, I would highly recommend it.