The constituent of hair is Keratin. The damaged , dry and easily broken hair is in need of concentrated care. Dermoday Keratin Hair Restoring Serum contains herbal keratin, vitamin E, biotin and caffeine. The Keratin in the product is obtained from herbal proteins: Soy, Corn, Wheat and Almond Protein. It helps to give the hair to fullness, shine and to make the hair tresses homogeneous. Can be used after rinsing or after bathing. Paraben and stain free.