Nexxus Styling Gel Does Being Allergic To One Of Nexxus's Hair Products Mean Im Allergic To EVERYTHING From That Brand?

Does being allergic to one of Nexxus's hair products mean im allergic to EVERYTHING from that brand? - nexxus styling gel

I never found what I'm allergic, but ....

I tried a drop of Nexxus shampoo and it made my hair more than usual. I believe that with the help of an inhaler a heat treatment process design. My hair is still, because it is the same brand?