Step 3: This unique hair repair serum helps to perfect and secure moisture in every strand. Enriched with concentrated Elastin Protein and Caviar Complex, to visibly restore hair. From our New York Salon experts, Nexxus Nutritive Serum has been crafted to replenish up to 14 days of protein loss* in one use.*Proteins lost through washes. For use on wet or dry hair, this serum smoothens the hair surface to visibly restore it back to its pre-damaged state. Silicone and oils are encapsulated in white pearls and suspended in a protein-infused blend.