Rose Berry Keratin Complex Collagen Serum Revitalize dry and damaged hair with this powerful Keratin and Collagen complex serum. Keratin works to repair the hair structure from within, while Collagen provides deep hydration and improves elasticity. This lightweight formula seals the hair cuticle to eliminate frizz, protect against environmental damage, and leave your hair with a brilliant, healthy shine. Perfect for chemically treated or brittle hair.