Hair System Hair Serum Has Been Specially Formulated With A Mixture Of Natural Oils That Strengthen The Hair, Improve Its Structure, And Make The Hair More Flexible And Manageable, With A Silky And Soft Texture. It Works Effectively On Frizzy And Brittle Hair And Gives It A Stunning Shine Usage: A Few Drops Of The Serum Are Placed On The Palm Of The Hand, Rub The Palms Of The Hands, Then Rub The Hair With Them, And Repeat The Process Until The Serum Is Distributed Over The Entire Hair.