Wellness
Understanding the Hair Cortex
Discover the hair cortex, the core layer responsible for your hair's strength, color, and texture, and learn why its health is key to vibrant hair.
What is it?
The cortex is the middle, and thickest, layer of the hair shaft, situated between the outer cuticle and the inner medulla. Comprising the majority of the hair's weight, it consists of tightly packed keratin protein fibers. This crucial layer is what gives hair its strength, elasticity, and flexibility. The cortex also contains melanin, the pigment responsible for determining your natural hair color. Its structural integrity is fundamental to the overall health and resilience of each hair strand.
Why is it trending?
The beauty industry is shifting focus from superficial conditioning to deep, molecular-level hair repair. This has brought the cortex into the spotlight. Brands are developing "bond-building" treatments that specifically target and rebuild the broken keratin chains within the cortex, reversing damage from the inside out. There is growing consumer awareness that factors like heat styling, chemical treatments (coloring or perms), and environmental exposure directly harm the cortex. This knowledge drives the trend for products that protect and strengthen this vital core layer.
How does it affect people?
The health of the cortex directly impacts hair's appearance and manageability. A healthy, intact cortex results in strong, elastic hair that resists breakage and holds shine. When the cortex is damaged, the hair becomes weak, brittle, and prone to split ends and frizz. Protecting the cortex involves using heat protectant sprays, regular deep conditioning treatments, and gentle handling to keep the outer cuticle sealed. Understanding the cortex empowers people to choose effective products and habits for genuinely healthy hair, not just a cosmetic fix.