Keratin is a natural protein found in hair, skin, and nails, playing a crucial role in maintaining their strength and elasticity. When hair is exposed to heat styling, chemicals, or environmental damage, the keratin in the hair weakens or becomes depleted, leading to dryness, frizz, and breakage. The best keratin hair conditioner is designed to replenish this protein, repairing damage and promoting healthy, smooth hair. Let’s explore how these conditioners work on both the hair and scalp.