GLOSSARY

Is there a term from the field of dermatology and cosmetics that you do not understand? Would you like to know what it means? View the full definition from the La Roche-Posay glossary.

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Hair fiber

The hair fiber has a central 'core' of cells called the medulla, which is surrounded by the cortex, the real body of the fibre. It is covered by the cuticle. The hair fiber essentially comprises a fibrous structural protein called keratin.

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