What is the role of the cuticle in hair?

The cuticle plays a crucial role in protecting the inner layers of the hair, which include the cortex and medulla. This outermost layer is made up of overlapping, scale-like cells that act as a barrier against environmental damage, chemical treatments, and physical abrasion. When the cuticle is healthy and intact, it helps to maintain moisture within the hair, reduces frizz, and contributes to the overall strength and shine of the hair.

While nourishment is primarily provided through the bloodstream to the hair follicles beneath the scalp, the cuticle itself does not play a direct role in this process. Similarly, hair growth occurs at the follicle level, and though the cuticle is important for protecting the hair structure as it grows, it does not assist directly in that growth process. Formatting the hair’s style is more related to the manipulation of the hair shaft rather than the structural integrity provided by the cuticle. Thus, the role of the cuticle as a protective layer is essential for maintaining healthy hair.