The Hair Medulla: Unlocking Your Hair's Core

What is it?

The medulla is the innermost layer of the hair shaft, serving as the very core or marrow of the hair strand. This soft, fragile layer is composed of transparent cells and air spaces. Not all hair types have a medulla; it is typically found only in thicker, coarser hair and is often absent in individuals with naturally fine or light-colored hair. While the outer layers of the hair—the cuticle and cortex—are well-understood to provide protection and color, the precise biological function of the medulla in humans remains a topic of scientific investigation.

Why is it trending?

The medulla is gaining attention in the beauty world due to recent breakthroughs in hair science. New observation technologies have allowed researchers to understand this core structure better, leading to innovations like "Hair Medulla Care." Scientists have discovered that the medulla's internal structure, which can be porous, affects hair's appearance and transparency. This has spurred the development of advanced treatments that can penetrate to the hair's core to fill in gaps, improving its optical properties and overall look. This marks a shift from surface-level treatments to a deeper, structural approach to hair health.

How does it affect people?

The presence of a medulla is a key factor in why some hair feels thick and full. While traditionally overlooked in favor of the cuticle and cortex, the medulla's condition directly impacts hair's appearance. A porous medulla can make hair, especially grey hair, appear duller. New treatments targeting the medulla can improve the hair's internal structure to enhance its glossiness and shine. This innovation can even make grey hair look more transparent and less noticeable, allowing it to blend better with the surrounding hair. For consumers, this means access to smarter products that work from the inside out.

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