Keratin is a protein.
Keratin is a fibrous structural protein, renowned for its robust nature and its position as a key component in various biological structures. It's the primary protein found in hair, skin, and nails, providing strength and resilience.
Think of it this way:
- Hair's Foundation: Our hair is largely composed of keratin. This protein strengthens the hair shaft, reducing breakage and supporting healthy hair growth. As the TRESemmé website points out, keratin is the same material found in animal horns and hooves, which highlights its durability.
- Not Moisture: While moisture is essential for healthy hair, keratin itself isn't a source of moisture. Instead, it acts as a protective barrier that helps to retain moisture within the hair shaft. Protein and moisture work in tandem to keep hair healthy. Without protein, hair is weak, and without moisture, it is brittle.
Therefore, keratin serves a structural, protective role, making it distinctly a protein, not moisture.
