The best shampoo for keratin - treated hair is definitely sulfate-free shampoo.
Why use sulfate-free shampoo?
To begin with, we will explain what sulfates are in general. Sulfate is a product of the petrochemical industry. It already sounds pretty scary, doesn’t it? Unfortunately, sulfates are very cheap components, and their low content in shampoos and detergents makes them foamy and relatively cheap to produce.
Sulfate is a rather active component. It washes off a protective layer from the scalp along with sebum and grease. So, the sebaceous glands start to produce more sebum, and the hair becomes oily faster than usual. Or vice versa, the glands can‘t produce a sufficient amount of sebum, the skin dries up and dandruff appears.
That’s why sulfate-free shampoos after keratin hair straightening are an excellent alternative to usual shampoos, as they can gently wash your hair without washing away the precious keratin. Sulfate substitutes are based on natural components and glucose. Such shampoos are recommended for use after keratin straightening. The gentle effect of such shampoos does not affect either the keratin applied to the hair or the coloring pigment if the hair has been dyed.
