I recommend this shampoo.

I recommend G-Coop shampoo! The slightly small quantity is a drawback, but first of all, it feels very gentle and good for the scalp. Since I have oily hair, it gets very greasy, and using poor-quality shampoos used to cause severe scalp breakouts or itching, but I haven't experienced any of that since using this shampoo. So, I think it will be good for my hair health. However, because it is gentle, it is a bit disappointing that it doesn't have amazing cleansing power or leave my hair feeling squeaky clean.