It is true that this shampoo is very expensive for the quantity (250ml). But it really is very effective: - It perfectly regulates the production of sebum, which makes my hair regraissent much slower, while trade scour hair shampoo, it cleans without attacking. That's the effect of green clay. - It promotes the disentangling of the hair. Granted, I still need to use a conditioner conditioner, but they are still somewhat tangled, while the Dermaclay green clay shampoo I bought recently is completely horrible matted hair aside. In addition, the Dermaclay shampoo is very liquid and is therefore not interesting side quantity. - It is soft and the smell is nice, it is natural: it has no artificial smell of chemical shampoo from the supermarket, or the unbearable smell of essential oils and other natural shampoos. As for the appearance, some people say it looks like mud, yes, well it's clay, so do not expect it to have a chemical texture Trade clay it's green! This is not what makes it disgusting shampoo provided, on the contrary! It's just a shame that it is so expensive ...