A better life for sensitive skin

GLOSSARY : Hair loss

Your scalp

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.


Keratin is the chief structural constituent of hair. It is a protein with high content of cystine, a sulphur amino acid. The hair fibre forms during the keratinization process, when keratinocytes, which are cells found in the hair bulb, multiply, fill with keratin, then die and harden.

This word also belongs to the categories Dandruff, Sensitive scalp.