Glossary content banner

Inside Our Products

Définition

CYSTEINE [CYSTEINE]

Cysteine is a constituent amino acid of hair. It acts as a reducer when formulated under certain conditions in smoothing products: it makes the fibre malleable for anti-frizz action.

Discover

Our Latest News

See the latest Inside our Products articles.

  • UV Mune 400: our Biggest Sun Filtering Technology in 30 Years

  • Allergens in cosmetic products: how to disentangle the real from the fake?

  • Mexoryl®  XL

    See more

  • Mexoryl® SX

    See more

  • Our ecodesign policy

  • Our commitments to the environment

  • Formulas more respectful of the aquatic environment

  • Netlock, our technology for more effective sun protection

  • What is the classification and regulation of CMR substances?

  • Traces of impurities and contaminants: what are they and how to identify them?

  • Natural ingredient, of natural origin or chemical, how to see more clearly?

  • Labels: what are they and what is their purpose?

  • Vitamin E

    See more

  • Vitamin C

    See more

  • Avocado oil

    See more

  • Hemp

    See more

  • Aloe vera

    See more

  • Salicylic acid

    See more

  • Lactic acid

    See more

  • Sulphates

    See more

  • Babies, children, teenagers and pregnant women: how to meet their specific needs?

  • Ingredients

  • Product safety: our number one priority

  • Hyaluronic acid

    See more

  • Shea butter

    See more

  • Argan oil

    See more

  • Sun protection

    Suncare products: the protocol for evaluating their safety

  • Ingredients

    Nanoparticles: why do we use them?

  • Silicones

    See more

  • Palm oil

    See more