Keune Care Keratin Smooth Serum 0.8 oz Keune Care Keratin Smoothing Serum is infused with active keratin, argan oil and essential minerals. It smoothes and strengthens frizzy hair and provides thermal protection. This line works wonders for your damaged, dry or normal hair. After diligent use, your hair is left silky smooth, stronger, healthier and easier to manage. How? Keratin! This fibrous protein is like your hair's building block. It diminishes when your hair is damaged, and keratin loss makes hair extra vulnerable. Keratin Smooth products restore the hair and replenish keratin by injecting it into the outside of the strands as well as deep inside it.