Pantene's Pro-V Infinite Lengths Strength Leave in Serum is a hair serum for dry, damaged hair that helps strengthen hair and leave it looking visbily healthier, in 1 use. Enriched with niacinamide and vitamin E, it's a leave-in hair treatment that hydrates and helps repair damaged hair while repairing split ends. It instantly melts into your hair, replenishing it from within to the last centimeter. Use together with other Pantene Pro-V Infinite Lengths hair products for a complete hair care routine.