Shampoo cannot directly touch scalp?
Supporters of this statement believe that the ingredients of shampoo will stimulate the scalp. If you directly contact the scalp, the scalp will not be able to stand it. It is recommended to rub foam out of your hands before washing.
At first glance, it is quite reasonable. No wonder many people believe it.
But think about it and you will know… the manufacturer is really not a fool. If shampoo [is so powerful], wouldn’t it be used as an anti-riot weapon?
In fact, there are two points:
1. If you are allergic to the ingredients of shampoo, even if you rub the shampoo with your hands and dilute the shampoo with water, you will still be allergic when washing your hair, because allergic reactions are generally not related to the concentration and dosage of allergens.
2. Don’t worry about the so-called irritation. As long as it is a qualified shampoo of a regular brand, the irritation to the skin at the original concentration of the shampoo is small enough to reach the standard. Even if you pour the shampoo directly on your head, it is estimated that there will be no what problem. (Except for meat pain caused by waste)