What happens when humectants are applied to hair?

When humectants are applied to hair, they work by absorbing moisture from the environment and drawing it into the hair shaft. This property is essential for maintaining hydration and elasticity in the hair, making it smoother and more manageable. Humectants are especially beneficial in dry climates or during periods of low humidity, as they can help prevent dryness and brittleness by essentially "pulling" water molecules from the air to keep the hair moisturized.

The effectiveness of humectants relies on their ability to attract and hold onto moisture, which can significantly improve the overall health and appearance of the hair. This process contributes to reducing frizz, enhancing shine, and improving the texture of the hair. While other options presented may involve processes related to moisture and hair treatment, the primary action of humectants is to attract moisture, making the absorption of environmental moisture their defining characteristic.