What is the role of humectants in hair products?

Humectants are ingredients widely used in hair products due to their ability to attract and retain moisture. This characteristic is crucial for maintaining the hydration and overall health of hair. When applied, humectants draw moisture from the environment or from deeper layers of hair into the hair shaft, helping to combat dryness and brittleness. This moisture retention is essential for maintaining elasticity, shine, and a smooth texture in hair.

In contrast, the other options focus on different functions that are not related to moisture retention. Cleansing agents are designed specifically to remove dirt and build-up from the scalp and hair, which is a different process altogether. Enhancing color refers to ingredients that may deposit color or improve the vibrancy of hair dye, unrelated to moisture balance. Exfoliating the scalp involves removing dead skin cells, which also does not involve the moisture-attracting properties that humectants provide.