If it had 10 stars, I would give them. In recent years, I developed a terrible problem with oily dandruff. I reached a point where within less than 24 hours, the oiliness would reach 5 cm from the hair roots, my scalp would be constantly irritated, the hair follicles would hurt, and of course, I had to wash my hair every day not only to clean it but also to relieve the pain and itching. I bought this shampoo, and within 6 weeks, the problem has disappeared. I wash my hair every 3rd day, not because it has become oily, but for cleanliness reasons. The bottle is 200ml, which seemed very little to me, but with a very small amount, it creates amazing foam. (Note that I have very long hair, for example, I need 2.5 tubes of dye to cover all my hair). In the first 2 weeks, I used it 3 times, and from then on, 2 times a week. I used two hands. In the first hand, I did a moderate massage for 2 minutes, and in the second hand, I did a good massage for about 3 minutes and then left it for the same amount of time before rinsing it off. I followed with a hair mask or conditioner on the ends, not on the roots. Also, a very positive aspect is that it smells nice, doesn't dry out the hair, and doesn't tangle it (which is an issue for me and takes 20 minutes to detangle each time). I highly recommend it, it is the best among others I have tried over time. It takes about 6 applications to see visible results.