Great for cleaning the scalp, especially since I'm dandruff-prone because of my eczema. This is calming to my scalp and helps with hair loss prevention too. I think it was HK$160 and you use a palm-size each time so it should last 6 times. You shake vigorously till you can't hear any swishing sounds and the shopkeeper recommended letting it sit 10 mins on the scalp then 3 mins of massaging it in. I got it at United Hair at 2/F Kwai Chung Plaza and they also have a shop at Mongkok. At request, they have a scalp camera where you can see how clean and healthy your scalp is. So you can visually see the difference after using the product a few times. I like that it's non-irritating for me and cheap compared to getting a scalp treatment at a salon, which can cost a lot.